State system for ensuring the uniformity of measurements. Ammeters, voltmeters, wattmeters, varmeters. Verification method. Registration of verification results

GOST 8.497-83
(ST SEV 1709-88)
(Changed edition, Amendment No. 1)

Group T88.3*
_________________________
* In the Index "National
standards" 2004
group T88.8 is shown. -
Note.

STATE STANDARD OF THE USSR UNION

State system for ensuring the uniformity of measurements

AMPERMETERS, VOLTMETERS, WATTMETERS, VARMETERS

Verification method*

State system for ensuring the uniformity of measurements.
Ammeters, voltmeters, wattmeters, varmeters.
Calibration methods*

__________
*

Date of introduction 1985-01-01

APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated December 9, 1983 N 5815

INSTEAD of Instructions 184-62 regarding verification of ammeters up to 30 A, voltmeters up to 1000 V, wattmeters and varmeters

REISSUE. April 1985

AMENDED Change No. 1, approved by resolution of the USSR State Committee for Standards dated 08.28.89 N 2652 and put into effect from 07.01.90.

Changes were made by the legal bureau according to the text of IUS No. 12 of 1989.

This standard applies to ammeters, voltmeters, wattmeters and varmeters (hereinafter referred to as instruments) in accordance with GOST 8711-78 and GOST 8476-78, as well as the measuring parts of these instruments and establishes the methodology for their initial and periodic verification on direct and alternating current in the frequency range 10-20000 Hz.

According to the methodology of this standard, it is allowed to verify electrical measuring instruments with metrological characteristics similar to the characteristics of the instruments listed above.

The standard does not apply to electronic, recording and regulating devices.

(Changed edition, Amendment No. 1).

1. OPERATIONS AND MEANS OF VERIFICATION

1.1. When performing verification, perform the operations and use the verification tools indicated in the table.

the name of the operation	Standard clause number	Verification tools and their regulatory specifications
Visual inspection
Testing
Checking electrical strength and insulation resistance		Ohmmeter according to GOST 23706-79 with an error of no more than 30%; breakdown device type VUF5-3 or UPU-10 (see reference appendix 2)
Determination of the main error, variation of readings and residual deviation of the instrument pointer from the zero mark:
when checking on DC:
ammeters		Ammeter accuracy class 0.2 according to GOST 8711-78; Potentiometric DC installation type U355 with a basic permissible error limit of 0.01-0.035%;
		direct current calibrator type P321 with a measurement limit of 10·10-10 A and a measurement error of 0.01-0.05%;
		installation for verification and calibration of electrical measuring instruments of type U300;
		measuring installation type U358
voltmeters		Voltmeters of accuracy classes 0.1; 0.2; 0.5 according to GOST 8711-78;
		DC voltage calibrator type V1-12 (voltage measure) with a basic permissible error limit of 0.005-0.01%;
		programmable calibrator type P320 with a permissible basic error limit of 0.005-0.01%;
		digital voltmeter type Shch1516 with a permissible basic error limit of 0.01-0.06%;
		potentiometric setting;
		installation for verification and calibration of electrical measuring instruments and measuring installation according to clause 4.4.6.1
wattmeters		Wattmeters of accuracy classes 0.1 and 0.2 according to GOST 8476-78;
		potentiometric and measuring installations according to clause 4.4.6.1
when checking devices on alternating current		Installation type U1134 with instruments of accuracy class 0.2 according to GOST 8711-78, certified as exemplary;
		ammeters of accuracy classes 0.1; 0.2; 0.5 according to GOST 8711-78;
		voltmeters according to clause 4.4.6.2, wattmeters according to clause 4.4.6.3;
		measuring set type K505 with instruments of accuracy class 0.5 according to GOST 8711-78, certified as exemplary;
		verification facility for permanent and alternating current type U3551 with a permissible basic error limit of 0.03-1.5% or a universal semi-automatic verification unit UPPU-1M with a permissible basic error limit of 0.04-0.3%;
		installation for checking microammeters and millivoltmeters of the UPMA-3M type with a permissible basic error limit of 0.1-0.2%;
		digital voltmeter type F4830 with a permissible basic error limit of 0.01-0.1%;
		differential digital voltmeter type V3-58 with a permissible basic error limit of 0.03-0.1%;
		device for testing voltmeters type V1-9 with amplifier YA1V-22, with a maximum permissible basic error of 0.03-0.1%

(Changed edition, Amendment No. 1).

Notes:

1. It is allowed to use other verification means that meet the accuracy requirements of this standard.

2. Electric strength and insulation resistance are determined only when devices are released from production and after repair.

The ratio of the absolute basic error limits of standard measuring instruments and verified wattmeters and varmeters should be no more than 1:3 for each checked scale mark when calibrating instruments of accuracy classes 0.05-0.5 and no more than 1:4 - when calibrating instruments of accuracy classes 1 ,0-5.0, while the variation in the readings of a device certified as a reference device should not exceed half the absolute value of the limit of its permissible basic error. It is permissible to take the indicated ratios equal to 1:2.5, but in this case it is necessary to introduce amendments to the readings of the standard measuring instrument in order to fulfill the requirements specified above.

4. The frequency and measurement ranges of standard measuring instruments must include the corresponding ranges of the device being tested.

2. CONDITIONS OF VERIFICATION AND PREPARATION FOR IT

2.1. When conducting verification, the following conditions must be met:

Ambient temperature:

(20±2)° C - for accuracy classes 0.05-0.5;

(20±5)° C - for accuracy classes 1.0-5.0;

Relative air humidity 30-80%;

Atmospheric pressure 84-106 kPa.

Normal values of other influencing quantities and permissible deviations are in accordance with GOST 8711-78 and GOST 8476-78.

(Changed edition, Amendment No. 1).

2.2. The devices being verified must be prepared for operation in accordance with the technical documentation (hereinafter referred to as TD) for devices of specific types.

(Changed edition, Amendment No. 1).

2.3. The device can be verified without interchangeable auxiliary parts.

2.4. A device used with limitedly interchangeable and non-interchangeable auxiliary parts is verified together with the latter. If the device and the limited interchangeable auxiliary part have their own accuracy class designation, the limited interchangeable auxiliary parts are allowed to be tested separately from the device.

(Changed edition, Amendment No. 1).

2.5. Instrument readings are taken in a direction perpendicular to the scale.

2.6. Instruments calibrated with calibrated wires are verified together with these wires. Devices calibrated with connecting wires of a certain resistance are verified together with an equivalent resistance equal to the resistance of these wires.

2.7. Three-phase devices are verified at symmetrical voltage and uniform phase load according to GOST 8476-78.

Note. Three-phase multi-element wattmeters can be verified in a single-phase connection circuit (with current circuits connected in series and voltage circuits connected in parallel), if such an indication is included in the TD for devices of specific types.

(Changed edition, Amendment No. 1).

2.8. Direct and alternating current devices are verified as follows:

2.8.1. Devices certified as exemplary are verified at the type of current at which they are used.

2.8.2. Devices used as workers are tested on direct and alternating current.

2.8.3. During periodic verification, working electrodynamic devices with a frequency of up to 100 Hz can only be checked using direct current.

(Changed edition, Amendment No. 1).

2.9. When checking on direct current devices of a magnetoelectric system, devices of the same system are used as exemplary measuring instruments, and when checking devices of other systems, devices of electrodynamic and electromagnetic systems are used.

2.10. Testing of working devices on alternating current should be carried out at normal frequency values. If a normal frequency value is not specified or a range of normal frequency values is specified, including a frequency of 50 Hz, then verification is carried out at a frequency of 50 Hz. If a range of normal frequency values is specified, which does not include a frequency of 50 Hz, then verification is carried out at a frequency calculated by the formula

where is the final frequency of the range of normal frequency values of the device being tested;

The initial frequency of the range of normal frequency values of the device being tested.

Note. If the device is used at certain frequencies within the frequency range, then during operation and storage verification is carried out at these frequencies. When devices are released from production and after repair, verification is carried out at one frequency within the range of normal frequency values and at the extreme frequencies of the range.

2.11. Verification of devices certified as exemplary on alternating current is carried out at frequencies of 50 Hz, the frequency calculated by formula (1) and at the end frequency of the range. If a range of normal frequency values is specified that does not include a frequency of 50 Hz, then the device should also be checked at the initial frequency of the range.

Multi-range instruments used as reference instruments are verified at all numerical scale marks on the measurement ranges in which they are used. On other ranges they are checked at two scale marks, as indicated above.

Instruments with several scales or instruments measuring several quantities must be verified on each scale and for each measured quantity separately.

Instruments with a double-sided scale are checked at all numerical marks on the left and right sides of the scale.

2.13. Working panel devices can be verified without dismantling from the switchboard or panel using electrically switching elements that do not affect the metrological characteristics of the devices.

2.14. If before the start of verification the measuring instruments were in conditions different from normal conditions of use, then verification should begin after keeping them in normal conditions for the time specified in technical documentation for a specific device.

(Changed edition, Amendment No. 1).

2.15. Before verification, the following preparatory operations must be performed.

2.15.1. The pointer of the device being tested is set by a mechanical corrector to the zero mark of the scale with the current and voltage circuits disconnected.

Note. During the verification process, it is not allowed to reset the pointer to the zero mark.

2.15.2. The devices are connected to the circuit and warmed up in order to establish an operating mode for the time and under the loads specified in the TD for specific types of devices. If the TD does not provide for a warm-up time, the devices are not preheated, and the main error is determined immediately after connecting the device to the circuit.

(Changed edition, Amendment No. 1).

2.15.3. The indicator of wattmeters and varmeters of accuracy classes 0.5-5.0 is set to the mechanical zero mark immediately after the rated voltage is applied to the device, and the current circuit must be open when the current source is turned on.

2.15.4. Devices that have controls, settings and corrections are pre-configured or adjusted in accordance with the requirements of technical documentation for devices of specific types.

(Changed edition, Amendment No. 1).

2.15.5. Devices with small measurement limits (micro-milliammeters, millivoltmeters) protect against leakage currents and thermoelectromotive forces in accordance with TD for specific types of devices.

(Changed edition, Amendment No. 1).

2.15.6. If the device has a symbol (arrow) indicating the position of the device in the earth's magnetic field, then the device is installed so that this arrow is directed along the magnetic meridian.

3. SAFETY REQUIREMENTS

3.1. When calibrating devices, the electrical safety requirements in accordance with GOST 12.1.006-84, GOST 12.3.019-80, GOST 12.2.007.0-75 - GOST 12.2.007.6-75, GOST 12.2.007.7-83, GOST 12.2.007.8- must be met. 75 - GOST 12.2.007.14-75.

In this case, the “Rules” must be observed technical operation electrical installations of consumers" and "Safety rules for the operation of electrical installations of consumers", approved by Gosenergonadzor.

4. VERIFICATION

4.1. Visual inspection

During an external inspection of the device, the following should be established:

No external damage or damage to the scale coating;

Clarity of all inscriptions in accordance with GOST 8711-78 and GOST 8476-78;

The device is equipped with spare parts and accessories necessary for verification.

4.2. Testing

During testing, reliable fastening of the device clamps, smooth operation and clear fixation of the switches should be established.

4.3. Checking electrical strength and insulation resistance

4.3.1. Electrical strength and insulation resistance are checked according to GOST 8711-78 for ammeters and voltmeters and according to GOST 8476-78 for wattmeters and varmeters using an installation, the technical characteristics of which are given in Reference Appendix 2.

The electrical insulation resistance should not be less than the value established in GOST 8711-78 for ammeters and voltmeters and in GOST 8476-78 for wattmeters and varmeters.

Note. It is allowed to check the electrical strength of insulation on direct current, if this is provided in the TD for devices of specific types.

(Changed edition, Amendment No. 1).

4.4. Determination of the main error, variation of readings and residual deviation of the instrument pointer from the zero mark

4.4.1. The main error and variation of readings of single-range instruments of accuracy classes is 0.05; 0.1 and 0.2 are determined at each numerical mark on the scale.

Note. For instruments with an accuracy class of 0.5 and less accurate, as well as for instruments with a uniform scale with more than 10 numerical marks, it is allowed to determine the main error and variation of readings only at five scale marks, evenly distributed over the measurement range.

(Changed edition, Amendment No. 1).

4.4.2. The main error of instruments as a percentage of the standard value is calculated using the formula

, (2)

where is the value of the measured quantity, determined from the readings of the device being verified;

The actual value of the measured quantity, determined from the readings of a standard measuring instrument;

Standard value.

The main error of the device being verified should not exceed the limit of permissible main error according to GOST 8476-78 and GOST 8711-78.

For devices tested in two directions of current, the largest of the obtained values is taken as the variation at each point on the scale. The variation is determined based on the measurement results obtained when determining the main error.

The variation in readings of working instruments should not exceed the values established in GOST 8711-78 and GOST 8476-78. The variation in the readings of instruments certified as exemplary should not exceed half the values of the maximum permissible basic error of this instrument.

The residual deviation of the device pointer from the zero scale mark should not exceed the values specified in GOST 8711-78 and GOST 8476-78.

If it is necessary to determine corrections, the main error of the device being verified is determined for each scale mark being checked as the arithmetic mean of four error values.

None of the error values obtained from four measurements should exceed the value of the maximum permissible basic error of the device being verified.

(Changed edition, Amendment No. 1).

None of the error values obtained from two measurements should exceed the permissible error limit of the device being tested.

If it is necessary to determine corrections, the main error of the device being verified is determined for each scale mark as the arithmetic mean of two error values.

(Changed edition, Amendment No. 1).

4.4.6. DC verification

4.4.6.1. Ammeters of accuracy classes 0.1-0.5 are verified by direct measurements using a calibrator or indirect measurements using a potentiometric setup. Ammeters of accuracy classes 1.0-5.0 are verified by direct comparison using standard ammeters and installations for checking and calibrating electrical measuring instruments according to the diagrams given in the TD for standard measuring instruments.

(Changed edition, Amendment No. 1).

4.4.6.2. Voltmeters of accuracy classes 0.1-0.5 are verified by the method of direct measurements using a calibrator or potentiometric setup (a digital voltmeter can be used instead of a potentiometer), accuracy classes 1.0-5.0 - by the method of direct comparison using standard voltmeters and a setup for verification and calibration of electrical measuring instruments according to the diagrams given in the TD for standard measuring instruments.

(Changed edition, Amendment No. 1).

4.4.6.3. Wattmeters of accuracy classes 0.1-0.5 are verified by the method of indirect measurements using a potentiometric installation, wattmeters of accuracy classes 1.0-5.0 - by the method of direct comparison with standard wattmeters according to the diagrams given in the TD for standard measuring instruments.

(Changed edition, Amendment No. 1).

Notes:

1. Ammeters, voltmeters and wattmeters of accuracy class 0.5 may be verified by direct comparison with ammeters, voltmeters and wattmeters of accuracy class 0.2 (with the introduction of corrections) or 0.1.

(Changed edition, Amendment No. 1).

2. Ammeters, voltmeters and wattmeters of accuracy class 0.5, certified as exemplary ones, can be verified by direct comparison only with ammeters, voltmeters and wattmeters of accuracy class 0.1.

3. Ammeters of accuracy classes 1.0-5.0 can be verified by direct or indirect measurements.

4. Voltmeters of accuracy classes 1.0-5.0 can be verified by direct measurements.

4.4.7. AC verification

4.4.7.1. Ammeters of accuracy classes 0.1-0.2 are verified by comparison using a comparator, ammeters of accuracy classes 0.5-4.0 - by direct comparison with standard ammeters or by comparison using a comparator according to the diagrams given in the TD for standard measuring instruments .

(Changed edition, Amendment No. 1).

4.4.7.2. Voltmeters of accuracy classes 0.1-0.5 are verified by the method of direct comparison with standard voltmeters or the method of direct measurements, or the method of comparison using a comparator. Instead of a comparator, a digital AC voltmeter can be used to measure the rms voltage value. Voltmeters of accuracy classes 1.0-5.0 are verified by direct comparison with standard voltmeters according to the diagrams given in the TD for standard measuring instruments.

(Changed edition, Amendment No. 1).

Note. Voltmeters of accuracy classes 1.0-5.0 can be verified by direct measurements or by comparison using a comparator.

4.4.7.3. Wattmeters of accuracy classes 0.1-0.2 are verified by the comparison method using a comparator, wattmeters and varmeters of accuracy classes 0.5-5.0 - by the method of direct comparison with standard wattmeters and varmeters or by the comparison method using a comparator according to the diagrams given in the TD for exemplary measuring instruments.

(Changed edition, Amendment No. 1).

4.4.8. Ammeters, voltmeters, wattmeters of accuracy classes 0.1-0.5, certified as exemplary ones, should be verified according to paragraphs. 4.4.6 and 4.4.7.

4.4.9. The results of verification of instruments of accuracy classes 0.05-0.5 are recorded in a protocol, the form of which is given in Appendix 1.

The results of verification of portable instruments of accuracy classes 1.0-5.0 are documented in a free-form protocol.

Note. In the case of using automatic verification installations with registration of the error of the instruments being verified in digital form on a digital printing device, the verification protocol is filled out in the form specified in the TD for the installation.

(Changed edition, Amendment No. 1).

5. REGISTRATION OF VERIFICATION RESULTS

5.1. Positive results must be documented:

Primary verification - by an entry in the device passport, certified in the manner established by the manufacturer;

Periodic state verification of model devices - issuing a certificate in the form established by Gosstandart and applying a verification stamp in a place that excludes access to the inside of the device. On the reverse side of the certificate, the type of current at which the device is verified and the variation of the device readings are indicated;

Periodic departmental verification of standard instruments - issuing a verification certificate drawn up by the departmental metrological service and applying a verification mark. On the reverse side of the certificate, the type of current at which the device is verified and the variation of the device readings are indicated;

Periodic state and departmental verification of working instruments - by applying a verification stamp.

5.2. If the verification results are negative, the mark of the previous verification is extinguished, and the devices are prohibited from being put into circulation and used. The previous verification certificate is canceled and a record of unsuitability is entered in the passport.

ANNEX 1
Information

Verification protocol form

PROTOCOL N_________

verification ________________________________________ type _________________ N_________

device name

owned by ___________________________________________________________________

owner organization

Manufacturer	Type of current	Device system*	Device class	Measurement limits

________________
* Magnetoelectric, electrodynamic, electromagnetic.

Verification means:

Verification conditions:

Temperature __________________________ ° C

Humidity _________________________%

Pressure __________________________ kPa.

Preheat the device __________ min.

Verification results:

Device being verified		Exemplary device
Countdown on a scale, division	Indication**	Scale reading in forward direction of current, division

________________
** In units of the measured value.

The variation in instrument readings does not exceed __________________________________________

The residual deviation of the instrument pointer from the zero scale mark is _______________

Conclusion __________________________________________________________________________

pass, fail

_____________________________________________________________________________________

Name of the organization that carried out the verification

The verification was carried out by ________________ ________________________________
signature Last name, first name, patronymic

(Changed edition, Amendment No. 1).

APPENDIX 2
Information

Main technical characteristics of the installation for testing electrical insulation strength

	Test voltage, kV	Installation power, kVA, not less
	From 0.5 to 3

The adjusting device must allow smooth adjustment of the voltage from zero to the maximum value of the test voltage.

Voltage setting error - in accordance with section. 4 GOST 22261-82 and section. 3 GOST 8476-78 and GOST 8711-78.

When testing devices on direct current converted from alternating current, the voltage ripple coefficient should be no more than 10%.

The text of the document is verified according to:
official publication
State Standard of the USSR -
M.: Standards Publishing House, 1986

Legal bureau
Amendment No. 1 was introduced into the text of the document,
approved by resolution
USSR State Committee for
standards dated 08.28.89 N 2652

GOST 8.497-83 (ST SEV 1709-79) GSI. Ammeters, voltmeters, wattmeters, varmeters. Methods and means of verification (With Change No. 1)

Adopted December 9, 1983
USSR State Committee for Standards

GOST 8.497-83
(ST SEV 1709-88)
(Changed edition, Amendment No. 1)
Group T88.3*

_________________________
* In the Index "National
standards" 2004
group T88.8 is shown. -
Note "CODE".

STATE STANDARD OF THE USSR UNION
State system for ensuring the uniformity of measurements
AMPERMETERS, VOLTMETERS, WATTMETERS, VARMETERS
Verification method*
State system for ensuring the uniformity of measurements.
Ammeters, voltmeters, wattmeters, varmeters.
Calibration methods*
__________
* (Changed edition, Amendment No. 1).
OKSTU 0008
Date of introduction 1985-01-01
APPROVED AND ENTERED INTO EFFECT by Resolution of the USSR State Committee on Standards dated December 9, 1983 N 5815
INSTEAD of Instructions 184-62 regarding verification of ammeters up to 30 A, voltmeters up to 1000 V, wattmeters and varmeters
REISSUE. April 1985
AMENDED Change No. 1, approved by resolution of the USSR State Committee for Standards dated 08.28.89 N 2652 and put into effect from 07.01.90.
Changes were made by the legal bureau "Code" according to the text of IUS No. 12 of 1989.
This standard applies to ammeters, voltmeters, wattmeters and varmeters (hereinafter referred to as instruments) in accordance with GOST 8711-78 and GOST 8476-78, as well as the measuring parts of these instruments and establishes the methodology for their initial and periodic verification on direct and alternating current in the frequency range 10-20000 Hz.
According to the methodology of this standard, it is allowed to verify electrical measuring instruments with metrological characteristics similar to the characteristics of the instruments listed above.
The standard does not apply to electronic, recording and regulating devices.
1. OPERATIONS AND MEANS OF VERIFICATION
1.1. When performing verification, perform the operations and use the verification tools indicated in the table.
Name of operation Number of clause of the standard Verification tools and their regulatory and technical characteristicsExternal inspection 4.1 -Testing 4.2 -Checking electrical strength and insulation resistance 4.3 Ohmmeter according to GOST 23706-79 with an error of no more than 30%; breakdown device type VUF5-3 or UPU-10 (see reference appendix 2)Determination of the main error, variation of readings and residual deviation of the instrument pointer from the zero mark: 4.4 -when checking on direct current:ammeters 4.4.6.1 Ammeter, accuracy class 0.2 according to GOST 8711-78; potentiometric direct current installation type U355 with a basic permissible error limit of 0.01-0.035%;direct current calibrator type P321 with a measurement limit of 10·10-10 A and a measurement error of 0.01-0.05%;installation for verification and calibration of electrical measuring instruments of type U300;measuring installation type U358voltmeters 4.4.6.2 Voltmeters of accuracy classes 0.1; 0.2; 0.5 according to GOST 8711-78;DC voltage calibrator type V1-12 (voltage measure) with a basic permissible error limit of 0.005-0.01%;programmable calibrator type P320 with a permissible basic error limit of 0.005-0.01%;digital voltmeter type Shch1516 with a permissible basic error limit of 0.01-0.06%;potentiometric setting;installation for verification and calibration of electrical measuring instruments and measuring installation according to clause 4.4.6.1wattmeters 4.4.6.3 Wattmeters of accuracy classes 0.1 and 0.2 according to GOST 8476-78;potentiometric and measuring installations according to clause 4.4.6.1when checking instruments on alternating current 4.4.7 Installation type U1134 with instruments of accuracy class 0.2 according to GOST 8711-78, certified as exemplary;ammeters of accuracy classes 0.1; 0.2; 0.5 according to GOST 8711-78;voltmeters according to clause 4.4.6.2, wattmeters according to clause 4.4.6.3;measuring set type K505 with instruments of accuracy class 0.5 according to GOST 8711-78, certified as exemplary;direct and alternating current testing installation type U3551 with a permissible basic error limit of 0.03-1.5% or a universal semi-automatic testing installation UPPU-1M with a permissible basic error limit of 0.04-0.3%;installation for checking microammeters and millivoltmeters of the UPMA-3M type with a permissible basic error limit of 0.1-0.2%;digital voltmeter type F4830 with a permissible basic error limit of 0.01-0.1%;differential digital voltmeter type V3-58 with a permissible basic error limit of 0.03-0.1%;device for testing voltmeters type V1-9 with amplifier YA1V-22, with a maximum permissible basic error of 0.03-0.1%
(Changed edition, Amendment No. 1).
Notes:
1. It is allowed to use other verification means that meet the accuracy requirements of this standard.
2. Electric strength and insulation resistance are determined only when devices are released from production and after repair.
3. The ratio of the limits of permissible absolute fundamental error of standard measuring instruments and verified ammeters and voltmeters for each checked scale mark should be no more than 1:5 when calibrating instruments of all accuracy classes. A ratio of no more than 1:3 is allowed when checking ammeters and voltmeters of accuracy classes 0.05-0.5 and no more than 1:4 - accuracy classes 1.0-5.0, while the variation in the readings of a device certified as an exemplary one is not must exceed half the absolute value of the limit of its permissible basic error.
The ratio of the absolute basic error limits of standard measuring instruments and verified wattmeters and varmeters should be no more than 1:3 for each checked scale mark when calibrating instruments of accuracy classes 0.05-0.5 and no more than 1:4 - when calibrating instruments of accuracy classes 1 ,0-5.0, while the variation in the readings of a device certified as a reference device should not exceed half the absolute value of the limit of its permissible basic error. It is permissible to take the indicated ratios equal to 1:2.5, but in this case it is necessary to introduce amendments to the readings of the standard measuring instrument in order to fulfill the requirements specified above.
4. The frequency and measurement ranges of standard measuring instruments must include the corresponding ranges of the device being tested.
2. CONDITIONS OF VERIFICATION AND PREPARATION FOR IT
2.1. When conducting verification, the following conditions must be met:
Ambient temperature:
(20±2)° C - for accuracy classes 0.05-0.5;
(20±5)° C - for accuracy classes 1.0-5.0;
relative air humidity 30-80%;
Atmosphere pressure 84-106 kPa.
Normal values of other influencing quantities and permissible deviations are in accordance with GOST 8711-78 and GOST 8476-78.
(Changed edition, Amendment No. 1).
2.2. The devices being verified must be prepared for operation in accordance with the technical documentation (hereinafter referred to as TD) for devices of specific types.
(Changed edition, Amendment No. 1).
2.3. The device can be verified without interchangeable auxiliary parts.
2.4. A device used with limitedly interchangeable and non-interchangeable auxiliary parts is verified together with the latter. If the device and the limited interchangeable auxiliary part have their own accuracy class designation, the limited interchangeable auxiliary parts are allowed to be tested separately from the device.
(Changed edition, Amendment No. 1).
2.5. Instrument readings are taken in a direction perpendicular to the scale.
2.6. Instruments calibrated with calibrated wires are verified together with these wires. Devices calibrated with connecting wires of a certain resistance are verified together with an equivalent resistance equal to the resistance of these wires.
2.7. Three-phase devices are verified at symmetrical voltage and uniform phase load according to GOST 8476-78.
Note. Three-phase multi-element wattmeters can be verified in a single-phase connection circuit (with current circuits connected in series and voltage circuits connected in parallel), if such an indication is included in the TD for devices of specific types.
(Changed edition, Amendment No. 1).
2.8. Direct and alternating current devices are verified as follows:
2.8.1. Devices certified as exemplary are verified at the type of current at which they are used.
2.8.2. Devices used as workers are tested on direct and alternating current.
2.8.3. During periodic verification, working electrodynamic devices with a frequency of up to 100 Hz can only be checked using direct current.
(Changed edition, Amendment No. 1).
2.9. When checking on direct current devices of a magnetoelectric system, devices of the same system are used as exemplary measuring instruments, and when checking devices of other systems, devices of electrodynamic and electromagnetic systems are used.
2.10. Testing of working devices on alternating current should be carried out at normal frequency values. If a normal frequency value is not specified or a range of normal frequency values is specified, including a frequency of 50 Hz, then verification is carried out at a frequency of 50 Hz. If a range of normal frequency values is specified, which does not include a frequency of 50 Hz, then verification is carried out at a frequency calculated by the formula
, (1)
where is the final frequency of the range of normal frequency values of the device being tested;
- the initial frequency of the range of normal frequency values of the device being tested.
Note. If the device is used at certain frequencies within the frequency range, then during operation and storage verification is carried out at these frequencies. When devices are released from production and after repair, verification is carried out at one frequency within the range of normal frequency values and at the extreme frequencies of the range.
2.11. Verification of devices certified as exemplary on alternating current is carried out at frequencies of 50 Hz, the frequency calculated by formula (1) and at the end frequency of the range. If a range of normal frequency values is specified that does not include a frequency of 50 Hz, then the device should also be checked at the initial frequency of the range.
2.12. Multi-range instruments can be verified at all numerical scale marks in only one measurement range; in the remaining ranges, it is sufficient to carry out verification at two scale marks: at the numerical mark corresponding to the standard scale value, and at the numerical mark at which the maximum error is obtained on the fully verified measurement range.
Multi-range instruments used as reference instruments are verified at all numerical scale marks on the measurement ranges in which they are used. On other ranges they are checked at two scale marks, as indicated above.
Instruments with several scales or instruments measuring several quantities must be verified on each scale and for each measured quantity separately.
Instruments with a double-sided scale are checked at all numerical marks on the left and right sides of the scale.
2.13. Working panel devices can be verified without dismantling from the switchboard or panel using electrically switching elements that do not affect the metrological characteristics of the devices.
2.14. If before the start of verification the measuring instruments were in conditions different from normal conditions of use, then verification should begin after keeping them in normal conditions for the time specified in the technical documentation for a specific device.
(Changed edition, Amendment No. 1).
2.15. Before verification, the following preparatory operations must be performed.
2.15.1. The pointer of the device being tested is set by a mechanical corrector to the zero mark of the scale with the current and voltage circuits disconnected.
Note. During the verification process, it is not allowed to reset the pointer to the zero mark.
2.15.2. The devices are connected to the circuit and warmed up in order to establish an operating mode for the time and under the loads specified in the TD for specific types of devices. If the TD does not provide for a warm-up time, the devices are not preheated, and the main error is determined immediately after connecting the device to the circuit.
(Changed edition, Amendment No. 1).
2.15.3. The indicator of wattmeters and varmeters of accuracy classes 0.5-5.0 is set to the mechanical zero mark immediately after the rated voltage is applied to the device, and the current circuit must be open when the current source is turned on.
2.15.4. Devices that have controls, settings and corrections are pre-configured or adjusted in accordance with the requirements of technical documentation for devices of specific types.
(Changed edition, Amendment No. 1).
2.15.5. Devices with small measurement limits (micro-milliammeters, millivoltmeters) protect against leakage currents and thermoelectromotive forces in accordance with TD for specific types of devices.
(Changed edition, Amendment No. 1).
2.15.6. If the device has a symbol (arrow) indicating the position of the device in the earth's magnetic field, then the device is installed so that this arrow is directed along the magnetic meridian.
3. SAFETY REQUIREMENTS
3.1. When calibrating devices, the electrical safety requirements in accordance with GOST 12.1.006-84, GOST 12.3.019-80, GOST 12.2.007.0-75 - GOST 12.2.007.6-75, GOST 12.2.007.7-83, GOST 12.2.007.8- must be met. 75 - GOST 12.2.007.14-75.
In this case, the “Rules for the technical operation of consumer electrical installations” and the “Safety rules for the operation of consumer electrical installations” approved by Gosenergonadzor must be observed.
4. VERIFICATION
4.1. Visual inspection
During an external inspection of the device, the following should be established:
no external damage or damage to the scale coating;
clarity of all inscriptions in accordance with GOST 8711-78 and GOST 8476-78;
completeness of the device with spare parts and accessories necessary for verification.
4.2. Testing
During testing, reliable fastening of the device clamps, smooth operation and clear fixation of the switches should be established.
4.3. Checking electrical strength and insulation resistance
4.3.1. Electrical strength and insulation resistance are checked according to GOST 8711-78 for ammeters and voltmeters and according to GOST 8476-78 for wattmeters and varmeters using an installation, the technical characteristics of which are given in Reference Appendix 2.
The electrical insulation resistance should not be less than the value established in GOST 8711-78 for ammeters and voltmeters and in GOST 8476-78 for wattmeters and varmeters.
Note. It is allowed to check the electrical strength of insulation on direct current, if this is provided in the TD for devices of specific types.
(Changed edition, Amendment No. 1).
4.4. Determination of the main error, variation of readings and residual deviation of the instrument pointer from the zero mark
4.4.1. The main error and variation of readings of single-range instruments of accuracy classes is 0.05; 0.1 and 0.2 are determined at each numerical mark on the scale.
Note. For instruments with an accuracy class of 0.5 and less accurate, as well as for instruments with a uniform scale with more than 10 numerical marks, it is allowed to determine the main error and variation of readings only at five scale marks, evenly distributed over the measurement range.
(Changed edition, Amendment No. 1).
4.4.2. The main error of instruments as a percentage of the standard value is calculated using the formula
, (2)
where is the value of the measured quantity, determined from the readings of the device being verified;
- the actual value of the measured quantity, determined from the readings of the standard measuring instrument;
- normalizing value.
The main error of the device being verified should not exceed the limit of permissible main error according to GOST 8476-78 and GOST 8711-7
4.4.3. The variation of instrument readings at the scale mark being checked is defined as the absolute value of the difference between the actual values of the measured quantity for the same instrument reading, obtained by smoothly moving the pointer first from the side of smaller and then from the side of large values with a constant current polarity.
For devices tested in two directions of current, the largest of the obtained values is taken as the variation at each point on the scale. The variation is determined based on the measurement results obtained when determining the main error.
The variation in readings of working instruments should not exceed the values established in GOST 8711-78 and GOST 8476-78. The variation in the readings of instruments certified as exemplary should not exceed half the values of the maximum permissible basic error of this instrument.
4.4.4. To determine the residual deviation of the pointer from the zero mark, the position of the pointer of the device being tested should be noted after a smooth decrease in the value of the measured quantity from the final scale mark to zero.
The residual deviation of the device pointer from the zero scale mark should not exceed the values specified in GOST 8711-78 and GOST 8476-78.
4.4.5. Direct and alternating current devices of accuracy classes 0.05 and 0.1 and devices of accuracy classes 0.05; 0.1; 0.2 and 0.5, certified as exemplary, must be verified in two directions of direct current when the readings decrease and increase.
If it is necessary to determine corrections, the main error of the device being verified is determined for each scale mark being checked as the arithmetic mean of four error values.
None of the error values obtained from four measurements should exceed the value of the maximum permissible basic error of the device being verified.
(Changed edition, Amendment No. 1).
4.4.5.1. Devices not specified in clause 4.4.5 must be verified in one direction of direct current. The error of such devices is determined by smoothly moving the pointer to each checked scale mark from the side of smaller and larger values of the measured quantity.
None of the error values obtained from two measurements should exceed the permissible error limit of the device being tested.
If it is necessary to determine corrections, the main error of the device being verified is determined for each scale mark as the arithmetic mean of two error values.
(Changed edition, Amendment No. 1).
4.4.6. DC verification
4.4.6.1. Ammeters of accuracy classes 0.1-0.5 are verified by direct measurements using a calibrator or indirect measurements using a potentiometric setup. Ammeters of accuracy classes 1.0-5.0 are verified by direct comparison using standard ammeters and installations for checking and calibrating electrical measuring instruments according to the diagrams given in the TD for standard measuring instruments.
(Changed edition, Amendment No. 1).
4.4.6.2. Voltmeters of accuracy classes 0.1-0.5 are verified by the method of direct measurements using a calibrator or potentiometric setup (a digital voltmeter can be used instead of a potentiometer), accuracy classes 1.0-5.0 - by the method of direct comparison using standard voltmeters and a setup for verification and calibration of electrical measuring instruments according to the diagrams given in the TD for standard measuring instruments.
(Changed edition, Amendment No. 1).
4.4.6.3. Wattmeters of accuracy classes 0.1-0.5 are verified by the method of indirect measurements using a potentiometric installation, wattmeters of accuracy classes 1.0-5.0 - by the method of direct comparison with standard wattmeters according to the diagrams given in the TD for standard measuring instruments.
(Changed edition, Amendment No. 1).
Notes:
1. Ammeters, voltmeters and wattmeters of accuracy class 0.5 may be verified by direct comparison with ammeters, voltmeters and wattmeters of accuracy class 0.2 (with the introduction of corrections) or 0.1.
(Changed edition, Amendment No. 1).
2. Ammeters, voltmeters and wattmeters of accuracy class 0.5, certified as exemplary ones, can be verified by direct comparison only with ammeters, voltmeters and wattmeters of accuracy class 0.1.
3. Ammeters of accuracy classes 1.0-5.0 can be verified by direct or indirect measurements.
4. Voltmeters of accuracy classes 1.0-5.0 can be verified by direct measurements.
4.4.7. AC verification
4.4.7.1. Ammeters of accuracy classes 0.1-0.2 are verified by comparison using a comparator, ammeters of accuracy classes 0.5-4.0 - by direct comparison with standard ammeters or by comparison using a comparator according to the diagrams given in the TD for standard measuring instruments .
(Changed edition, Amendment No. 1).
4.4.7.2. Voltmeters of accuracy classes 0.1-0.5 are verified by the method of direct comparison with standard voltmeters or the method of direct measurements, or the method of comparison using a comparator. Instead of a comparator, a digital AC voltmeter can be used to measure the rms voltage value. Voltmeters of accuracy classes 1.0-5.0 are verified by direct comparison with standard voltmeters according to the diagrams given in the TD for standard measuring instruments.
(Changed edition, Amendment No. 1).
Note. Voltmeters of accuracy classes 1.0-5.0 can be verified by direct measurements or by comparison using a comparator.
4.4.7.3. Wattmeters of accuracy classes 0.1-0.2 are verified by the comparison method using a comparator, wattmeters and varmeters of accuracy classes 0.5-5.0 - by the method of direct comparison with standard wattmeters and varmeters or by the comparison method using a comparator according to the diagrams given in the TD for exemplary measuring instruments.
(Changed edition, Amendment No. 1).
4.4.8. Ammeters, voltmeters, wattmeters of accuracy classes 0.1-0.5, certified as exemplary ones, should be verified according to paragraphs. 4.4.6 and 4.4.7.
4.4.9. The results of verification of instruments of accuracy classes 0.05-0.5 are recorded in a protocol, the form of which is given in Appendix 1.
The results of verification of portable instruments of accuracy classes 1.0-5.0 are documented in a free-form protocol.
Note. In the case of using automatic verification installations with registration of the error of the instruments being verified in digital form on a digital printing device, the verification protocol is filled out in the form specified in the TD for the installation.
(Changed edition, Amendment No. 1).
5. REGISTRATION OF VERIFICATION RESULTS
5.1. Positive results must be documented:
primary verification - by an entry in the device passport, certified in the manner established by the manufacturer;
periodic state verification of model instruments - issuing a certificate in the form established by Gosstandart and applying a verification stamp in a place that excludes access to the inside of the device. On the reverse side of the certificate, the type of current at which the device is verified and the variation of the device readings are indicated;
periodic departmental verification of standard instruments - issuing a verification certificate drawn up by the departmental metrological service and applying a verification mark. On the reverse side of the certificate, the type of current at which the device is verified and the variation of the device readings are indicated;
periodic state and departmental verification of working instruments - by imprinting a verification mark.
5.2. If the verification results are negative, the mark of the previous verification is extinguished, and the devices are prohibited from being put into circulation and used. The previous verification certificate is canceled and a record of unsuitability is entered in the passport.

verification ________________________________________ type _________________ N_________

device name

owned by ___________________________________________________________________

owner organization

________________

* Magnetoelectric, electrodynamic, electromagnetic.

Verification means:

Verification conditions:

temperature __________________________ ° C

humidity _________________________%

pressure __________________________ kPa.

Preheat the device __________ min.

Verification results:

________________

** In units of the measured value.

The variation in instrument readings does not exceed __________________________________________

The residual deviation of the instrument pointer from the zero scale mark is _______________

Conclusion __________________________________________________________________________

pass, fail

_____________________________________________________________________________________

Name of the organization that carried out the verification

Information

Main technical characteristics of the installation for testing electrical insulation strength

The adjusting device must allow smooth adjustment of the voltage from zero to the maximum value of the test voltage.

Voltage setting error - in accordance with section. 4 GOST 22261-82 and section. 3 GOST 8476-78 and GOST 8711-78.

When testing devices on direct current converted from alternating current, the voltage ripple coefficient should be no more than 10%.

The text of the document is verified according to:

official publication

State Standard of the USSR -

M.: Standards Publishing House, 1986

Legal Bureau "Kodeks"

Amendment No. 1 was introduced into the text of the document,

approved by resolution

USSR State Committee for

standards dated 08.28.89 N 2652

State system for ensuring the uniformity of measurements. Ammeters, voltmeters, wattmeters, varmeters. Verification method

current This standard applies to ammeters, voltmeters, wattmeters and varmeters in accordance with GOST 8711 and GOST 8476, as well as the measuring parts of these instruments and establishes the methodology for their initial and periodic verification on direct and alternating current in the frequency range 10-20000 Hz.
The standard does not apply to electronic, recording and regulating devices

Text GOST 8.497-83

With amendments and changes:
Change No. 1 to GOST 8.497-83 dated 07/01/1990 (text integrated into the text or description of the standard)

Other GOSTs

GOST R ISO 389-4-2011 State system for ensuring the uniformity of measurements. Acoustics. Reference zero for calibrating audiometric equipment. Part 4: Reference levels of narrowband masking noise
GOST R ISO 389-5-2011 State system for ensuring the uniformity of measurements. Acoustics. Reference zero for calibrating audiometric equipment. Part 5. Reference equivalent threshold levels sound pressure pure tones in the frequency range from 8 to 16 kHz
GOST R ISO 389-6-2011 State system for ensuring the uniformity of measurements. Acoustics. Reference zero for calibrating audiometric equipment. Part 6. Reference threshold of audibility of short-duration test signals
GOST R ISO 389-7-2011 State system for ensuring the uniformity of measurements. Acoustics. Reference zero for calibrating audiometric equipment. Part 7. Reference hearing threshold when listening in conditions of free and diffuse sound fields
GOST R ISO 389-8-2011 State system for ensuring the uniformity of measurements. Acoustics. Reference zero for calibrating audiometric equipment. Part 8: Reference equivalent pure tone sound pressure thresholds for enveloping telephones
GOST R ISO 389-9-2014 State system for ensuring the uniformity of measurements. Acoustics. Reference zero for calibrating audiometric equipment. Part 9: Recommended Test Conditions for Determining Reference Listening Threshold Levels
GOST 8.350-79 State system for ensuring the uniformity of measurements. High frequency ammeters. Methods and means of verification
GOST R 8.754-2011 State system for ensuring the uniformity of measurements. Analyzers of oxygen dissolved in water. Verification method
GOST 8.662-2018 State system for ensuring the uniformity of measurements. Analyzers of hydrogen dissolved in water. Verification method
GOST R 8.896-2015 State system for ensuring the uniformity of measurements. Laser particle size analyzers. Verification method
GOST R 8.838-2013 State system for ensuring the uniformity of measurements. Ethanol vapor analyzers. Verification method

approved Resolution of the USSR State Committee on Standards dated December 9, 1983 N 5815

Interstate standard GOST 8.497-83

"STATE SYSTEM FOR ENSURING THE UNITY OF MEASUREMENTS. AMPERMETERS, VOLTMETERS, WATTMETERS, VARMETERS. VERIFICATION METHODOLOGY"

State system for ensuring the uniformity of measurements. Amperemeters, voltmeters, wattmeters, varmeters. Calibration methods

Instead of Instructions 184-62

(in terms of checking ammeters up to 30 A,

voltmeters up to 1000 V, wattmeters and varmeters)

The standard does not apply to electronic, recording and regulating devices.

1. Operations and means of verification

1.1. When performing verification, perform the operations and use the verification tools indicated in the table.

the name of the operation	Standard clause number	Verification tools and their regulatory and technical standards characteristics
Visual inspection
Testing
Checking electrical strength and insulation resistance		Ohmmeter according to GOST 23706 with an error of no more than 30%; breakdown device type VUF5-3 or UPU-10 (see Appendix 2)
Determination of the main error, variation of readings and residual deviation of the instrument pointer from the zero mark:
when checking on direct current: ammeters		Ammeter accuracy class 0.2 according to GOST 8711; potentiometric direct current installation type U355 with a permissible basic error limit of 0.01 - 0.035%;
voltmeters		DC calibrator type P321 with limit measurement 10·10 -6 -10 and measurement error
		installation for verification and calibration of electrical measuring instruments of type U300;
		measuring installation type U358
		Voltmeters of accuracy classes 0, 1; 0, 2; 0.5 according to GOST 8711; DC voltage calibrator type V1-12 (voltage measure) with a basic permissible error limit of 0.005 - 0.01%; programmable calibrator type P320 with a permissible basic error limit of 0.005 - 0.01%; digital voltmeter type Shch1516 with a permissible basic error limit of 0.01 - 0.06%;
		potentiometric setting;
		installation for verification and calibration of electrical measuring instruments and measuring installation according to clause 4.4.6.1
wattmeters		Wattmeters of accuracy classes 0, 1 and 0, 2 according to GOST 8476; potentiometric and measuring installations according to clause 4.4.6.1
when checking devices on alternating current		Installation type U1134 with instruments of accuracy class 0.2 according to GOST 8711, certified as exemplary; ammeters of accuracy classes 0, 1; 0, 2; 0.5 according to GOST 8711; voltmeters according to clause 4.4.6.2, wattmeters according to clause 4.4.6.3; measuring set type K505 with instruments of accuracy class 0.5 according to GOST 8711, certified as exemplary; direct and alternating current testing installation type U3551 with a permissible basic error limit of 0.03 - 1.5% or a universal semi-automatic testing installation UPPU-1M with a permissible basic error limit of 0.04 - 0.3%; installation for checking microammeters and millivoltmeters of the UPMA-3M type with a permissible basic error limit of 0.1 - 0.2%; digital voltmeter type F4830 with a permissible basic error limit of 0.01 - 0.1%; differential digital voltmeter type V3-58 with a permissible basic error limit of 0.03 - 0.1%; device for checking voltmeters type V1-9 with amplifier YA1V-22, with a maximum permissible basic error of 0.03 - 0.1%

Notes:

1. It is allowed to use other verification means that meet the accuracy requirements of this standard.

2. Electric strength and insulation resistance are determined only when devices are released from production and after repair.

The ratio of the absolute basic error limits of standard measuring instruments and verified wattmeters and varmeters should be no more than 1:3 for each checked scale mark when calibrating instruments of accuracy classes 0.05 - 0.5 and no more than 1:4 - when calibrating instruments of accuracy classes 1 , 0 - 5, 0, while the variation in the readings of a device certified as a reference device should not exceed half the absolute value of the limit of its permissible basic error. It is allowed to take the indicated ratios equal to 1:2, 5, but in this case it is necessary to introduce amendments to the readings of the standard measuring instrument in order to fulfill the requirements specified above.

4. The frequency and measurement ranges of standard measuring instruments must include the corresponding ranges of the device being tested.

(Changed edition, Amendment No. 1).

2. Verification conditions and preparation for it

2.1. When conducting verification, the following conditions must be met:

Ambient temperature:

(20±2)°С - for accuracy classes 0.05 - 0.5;

(20±5)°С - for accuracy classes 1.0 - 5.0;

relative air humidity 30 - 80%;

atmospheric pressure 84 - 106 kPa.

Normal values of other influencing quantities and permissible deviations are in accordance with GOST 8711 and GOST 8476.

2.2. The devices being verified must be prepared for operation in accordance with the technical documentation (hereinafter referred to as TD) for devices of specific types.

2.1, 2.2. (Changed edition, Amendment No. 1).

2.3. The device can be verified without interchangeable auxiliary parts.

(Changed edition, Amendment No. 1).

2.5. Instrument readings are taken in a direction perpendicular to the scale.

2.7 Three-phase devices are verified at symmetrical voltage and uniform phase load in accordance with GOST 8476.

2.8. Direct and alternating current devices are verified as follows:

2.8.1 Devices certified as exemplary are verified at the type of current at which they are used.

2.8.2 Devices used as working devices are tested on direct and alternating current.

2.8.3 During periodic verification, working electrodynamic devices with a frequency of up to 100 Hz may only be checked using direct current.

(Changed edition, Amendment No. 1).

2.10. Testing of working devices on alternating current should be carried out at normal frequency values. If a normal frequency value is not indicated or a range of normal frequency values is indicated, including a frequency of 50 Hz, then verification is carried out at a frequency of 50 Hz. If a range of normal frequency values is specified, which does not include a frequency of 50 Hz, then verification is carried out at a frequency calculated by the formula

where f k is the final frequency of the range of normal frequency values of the device being tested;

f n - initial frequency of the range of normal frequency values of the device being tested.

2.11. Verification of devices certified as exemplary on alternating current is carried out at frequencies of 50 Hz, the frequency calculated by formula (1), and at the end frequency of the range. If a range of normal frequency values is specified, which does not include a frequency of 50 Hz, then the device should also be checked at the initial frequency of the range.

Instruments with several scales or instruments measuring several quantities must be verified on each scale and for each measured quantity separately.

Instruments with a double-sided scale are checked at all numerical marks on the left and right sides of the scale.

2.13 Working panel devices may be verified without dismantling from the switchboard or panel using electrically switching elements that do not affect the metrological characteristics of the devices.

2.14 If, before the start of verification, the measuring instruments were in conditions different from normal conditions of use, then verification should begin after keeping them in normal conditions for the time specified in the technical documentation for a specific device.

(Changed edition, Amendment No. 1).

2.15. Before verification, the following preparatory operations must be performed.

2.15.1. The pointer of the device being tested is set by a mechanical corrector to the zero mark of the scale with the current and voltage circuits disconnected.

Note. During the verification process, it is not allowed to reset the pointer to the zero mark.

2.15.2 The devices are connected to the circuit and warmed up in order to establish an operating mode for the time and under the loads specified in the TD for specific types of devices. If the TD does not provide for a warm-up time, the devices are not preheated and the main error is determined immediately after connecting the device to the circuit.

2.15.3. The indicator of wattmeters and varmeters of accuracy classes 0.5 - 5.0 is set to the mechanical zero mark immediately after the rated voltage is applied to the device, and the current circuit must be open when the current source is turned on.

2.15.4. Devices that have controls, settings and corrections are pre-configured or adjusted in accordance with the requirements of technical documentation for devices of specific types.

3. Safety requirements

4. Conducting verification

4.1. Visual inspection

During an external inspection of the device, the following must be installed:

no external damage or damage to the coating of the scale;

clarity of all inscriptions in accordance with GOST 8711 and GOST 8476;

completeness of the device with spare parts and accessories necessary for verification.

4.2. Testing

When testing, reliable fastening of the device clamps, smooth operation and clear fixation of the switches must be established.

4.3. Checking electrical strength and insulation resistance

The electrical insulation resistance should not be less than the value established in GOST 8711 for ammeters and voltmeters and in GOST 8476 for wattmeters and varmeters.

Note. It is allowed to check the electrical strength of insulation on direct current, if this is provided in the TD for devices of specific types.

(Changed edition, Amendment No. 1).

4.4. Determination of the main error, variation of readings and residual deviation of the instrument pointer from the zero mark

4.4.1. The main error and variation of readings of single-range instruments of accuracy classes 0.05; 0, 1 and 0, 2 are determined at each numerical mark on the scale.

Note. For instruments of accuracy class 0, 5 and less accurate, as well as for instruments with a uniform scale with more than 10 numerical marks, it is allowed to determine the main error and variation of readings only at five scale marks, evenly distributed over the measurement range.

(Changed edition, Amendment No. 1).

4.4.2. The main error of instruments as a percentage of the normalizing value is calculated using the formula

where A meas is the value of the measured quantity, determined from the readings of the device being verified;

A d - the actual value of the measured quantity, determined from the readings of the standard measuring instrument;

A n - normalizing value.

The basic error of the device being verified should not exceed the limit of permissible basic error according to GOST 8476 and GOST 8711.

The variation in the readings of working instruments should not exceed the values established in GOST 8711 and GOST 8476. The variation in the readings of instruments certified as exemplary ones should not exceed half the values of the permissible basic error limit of these instruments.

The residual deviation of the instrument pointer from the zero scale mark should not exceed the values specified in GOST 8711 and GOST 8476.

4.4.5. Direct and alternating current devices of accuracy classes 0.05 and 0.1 and devices of accuracy classes 0.05; 0, 1; 0.2 and 0.5, certified as exemplary, must be verified in two directions of direct current when the readings decrease and increase.

If it is necessary to determine corrections, the main error of the device being verified is determined for each scale mark being checked as the arithmetic mean of four error values.

None of the error values obtained from four measurements should exceed the value of the maximum permissible basic error of the device being verified.

None of the error values obtained from two measurements should exceed the permissible error limit of the device being tested.

If it is necessary to determine corrections, the main error of the device being verified is determined for each scale mark as the arithmetic mean of two error values.

(Changed edition, Amendment No. 1).

4.4.6. DC verification

4.4.6.1. Ammeters of accuracy classes 0.1 - 0.5 are verified by direct measurements using a calibrator or indirect measurements using a potentiometric setup. Ammeters of accuracy classes 1.0 - 5.0 are verified by direct comparison using standard ammeters and installations for checking and calibrating electrical measuring instruments according to the diagrams given in the TD for standard measuring instruments.

4.4.6.2. Voltmeters of accuracy classes 0, 1 - 0, 5 are verified by the method of direct measurements using a calibrator or potentiometric installation (a digital voltmeter can be used instead of a potentiometer), accuracy classes 1, 0 - 5, 0 - by the method of direct comparison using standard voltmeters and installation for verification and calibration of electrical measuring instruments according to the diagrams given in the TD for standard measuring instruments.

4.4.6.3. Wattmeters of accuracy classes 0, 1 - 0, 5 are verified by the method of indirect measurements using a potentiometric installation, wattmeters of accuracy classes 1, 0 - 5, 0 - by the method of direct comparison with standard wattmeters according to the diagrams given in the TD for standard measuring instruments.

Notes:

1. Ammeters, voltmeters and wattmeters of accuracy class 0.5 can be verified by direct comparison with ammeters, voltmeters and wattmeters of accuracy class 0.2 (with the introduction of corrections) or 0.1.

2. Ammeters, voltmeters and wattmeters of accuracy class 0, 5, certified as exemplary, can be verified by direct comparison only with ammeters, voltmeters and wattmeters of accuracy class 0, 1.

3. Ammeters of accuracy classes 1.0 - 5.0 can be verified by direct or indirect measurements.

4. Voltmeters of accuracy classes 1.0 - 5.0 can be verified by direct measurements.

(Changed edition, Amendment No. 1).

4.4.7. AC verification

4.4.7.1. Ammeters of accuracy classes 0, 1 - 0, 2 are verified by comparison using a comparator, ammeters of accuracy classes 0, 5 - 4, 0 - by direct comparison with standard ammeters or by comparison using a comparator according to the diagrams given in the TD for standard measuring instruments .

4.4.7.2. Voltmeters of accuracy classes 0.1 - 0.5 are verified by the method of direct comparison with standard voltmeters or the method of direct measurements, or the method of comparison using a comparator. Instead of a comparator, a digital AC voltmeter can be used to measure the rms voltage value. Voltmeters of accuracy classes 1.0 - 5.0 are verified by direct comparison with standard voltmeters according to the diagrams given in the TD for standard measuring instruments.

Note. Voltmeters of accuracy classes 1.0 - 5.0 can be verified by direct measurements or by comparison using a comparator.

4.4.7.3. Wattmeters of accuracy classes 0, 1 - 0, 2 are verified by the comparison method using a comparator, wattmeters and varmeters of accuracy classes 0, 5 - 5, 0 - by the method of direct comparison with standard wattmeters and varmeters or by the comparison method using a comparator according to the diagrams given in the TD for exemplary measuring instruments.

4.4.8. Ammeters, voltmeters, wattmeters of accuracy classes 0.1 - 0.5, certified as exemplary ones, should be verified according to paragraphs. 4.4.6 and 4.4.7.

4.4.9. The results of verification of instruments of accuracy classes 0.05 - 0.5 are entered into a protocol, the form of which is given in Appendix 1.

The results of verification of portable instruments of accuracy classes 1.0 - 5.0 are documented in a free-form protocol.

(Changed edition, Amendment No. 1).

5. Registration of verification results

5.1. Positive results must be documented:

primary verification - by an entry in the device passport, certified in the manner established by the manufacturer;

periodic state verification of model instruments - issuing a certificate in the form established by Gosstandart and applying a verification stamp in a place that excludes access to the inside of the device. On the reverse side of the certificate, the type of current at which the device is verified and the variation of the device readings are indicated;

periodic departmental verification of standard instruments - issuing a verification certificate drawn up by the departmental metrological service and applying a verification mark. On the reverse side of the certificate, the type of current at which the device is verified and the variation of the device readings are indicated;

periodic state and departmental verification of working instruments - by imprinting a verification mark.

Annex 1
Information

FORM OF VERIFICATION PROTOCOL

PROTOCOL N ___________

verification _____________________________ type _______________ N ___________,

Device name

owned by __________________________________________________________

Owning organization

Verification means:

Verification conditions:

Temperature _______________ °C

Humidity _________________ %

Pressure ___________________ kPa.

Preheat the device ____________ min.

Verification results:

The variation in instrument readings does not exceed _________________________________

Residual deviation of the instrument pointer from the zero scale mark

is ______________________________________________________________

____________

* Magnetoelectric, electrodynamic, electromagnetic.

** In units of the measured value.

Conclusion ______________________________________________________________

Pass, fail

_________________________________________________________________________

Name of the organization that carried out the verification

The verification was carried out by __________________ _____________________________

Signature surname, name, patronymic

Appendix 2
Information

Main technical characteristics
installations for testing electrical insulation strength

The adjusting device must allow smooth adjustment of the voltage from zero to the maximum value of the test voltage.

Voltage setting error - in accordance with section. 4 GOST 22261 and sec. 3 GOST 8476 and GOST 8711.

When testing devices on direct current converted from alternating current, the voltage ripple coefficient should be no more than 10%.

GOST 8.497-83

Group T88.8

INTERSTATE STANDARD

State system for ensuring the uniformity of measurements

AMPERMETERS, VOLTMETERS, WATTMETERS, VARMETERS

Verification method

State system for ensuring the uniformity of measurements. Amperemeters, voltmeters, wattmeters, varmeters. Calibration methods

ISS 17.220.20
OKSTU 0008

Date of introduction 1985-01-01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the USSR State Committee for Standards

2. APPROVED AND ENTERED INTO EFFECT by Decree of the USSR State Committee on Standards dated 09.12.83 N 5815

3. The standard fully complies with ST SEV 1709-88

4. Instead of Instruction 184-62 (regarding the verification of ammeters up to 30 A, voltmeters up to 1000 V, wattmeters and varmeters)

5. REFERENCE REGULATIVE AND TECHNICAL DOCUMENTS


	Number of paragraph, subparagraph, application



	Introductory part; 1.1; 2.1; 2.7; 4.1; 4.3.1; 4.4.2; 4.4.3; 4.4.4; appendix 2
	Introductory part; 1.1; 2.1; 4.1; 4.3.1; 4.4.2; 4.4.3; 4.4.4; appendix 2
	Appendix 2

6. EDITION (January 2005) with Amendment No. 1, approved in August 1989 (IUS 12-89)

This standard applies to ammeters, voltmeters, wattmeters and varmeters (hereinafter referred to as instruments) in accordance with GOST 8711 and GOST 8476, as well as the measuring parts of these instruments and establishes a methodology for their initial and periodic verification on direct and alternating current in the frequency range 10-20000 Hz .

According to the methodology of this standard, it is allowed to verify electrical measuring instruments with metrological characteristics similar to the characteristics of the instruments listed above.

The standard does not apply to electronic, recording and regulating devices.

1. OPERATIONS AND MEANS OF VERIFICATION

1.1. When performing verification, perform the operations and use the verification tools indicated in the table.


the name of the operation	Standard clause number	Verification tools and their regulatory and technical characteristics
Visual inspection
Testing
Checking electrical strength and insulation resistance
		potentiometric direct current installation type U355 with a basic permissible error limit of 0.01-0.035%;
		direct current calibrator type P321 with a measurement limit of 10·10-10 A and a measurement error of 0.01-0.05%;
		installation for verification and calibration of electrical measuring instruments of type U300;
		measuring installation type U358
voltmeters		Voltmeters of accuracy classes 0.1; 0.2; 0.5 according to GOST 8711;
		DC voltage calibrator type V1-12 (voltage measure) with a basic permissible error limit of 0.005-0.01%;
		programmable calibrator type P320 with a permissible basic error limit of 0.005-0.01%;
		digital voltmeter type Shch1516 with a permissible basic error limit of 0.01-0.06%;
		potentiometric setting;
		installation for verification and calibration of electrical measuring instruments and measuring installation according to clause 4.4.6.1
wattmeters		Wattmeters of accuracy classes 0.1 and 0.2 according to GOST 8476;
		potentiometric and measuring installations according to clause 4.4.6.1
when checking devices on alternating current		Installation type U1134 with instruments of accuracy class 0.2 according to GOST 8711
		ammeters of accuracy classes 0.1; 0.2; 0.5 according to GOST 8711;
		voltmeters according to clause 4.4.6.2, wattmeters according to clause 4.4.6.3;
		measuring set type K505 with instruments of accuracy class 0.5 according to GOST 8711, certified as exemplary;
		direct and alternating current testing installation type U3551 with a permissible basic error limit of 0.03-1.5% or a universal semi-automatic testing installation UPPU-1M with a permissible basic error limit of 0.04-0.3%;
		installation for checking microammeters and millivoltmeters of the UPMA-3M type with a permissible basic error limit of 0.1-0.2%;
		digital voltmeter type F4830 with a permissible basic error limit of 0.01-0.1%;
		differential digital voltmeter type V3-58 with a permissible basic error limit of 0.03-0.1%;
		device for testing voltmeters type V1-9 with amplifier YA1V-22, with a maximum permissible basic error of 0.03-0.1%

Notes:

1. It is allowed to use other verification means that meet the accuracy requirements of this standard.

2. Electric strength and insulation resistance are determined only when devices are released from production and after repair.

3. The ratio of the limits of permissible absolute fundamental error of standard measuring instruments and verified ammeters and voltmeters for each checked scale mark should be no more than 1:5 when calibrating instruments of all accuracy classes. A ratio of no more than 1:3 is allowed when checking ammeters and voltmeters of accuracy classes 0.05-0.5 and no more than 1:4 - accuracy classes 1.0-5.0, while the variation in the readings of a device certified as an exemplary one is not must exceed half the absolute value of the limit of its permissible basic error.

The ratio of the absolute basic error limits of standard measuring instruments and verified wattmeters and varmeters should be no more than 1:3 for each checked scale mark when calibrating instruments of accuracy classes 0.05-0.5 and no more than 1:4 - when calibrating instruments of accuracy classes 1 ,0-5.0, while the variation in the readings of a device certified as a reference device should not exceed half the absolute value of the limit of its permissible basic error. It is permissible to take the indicated ratios equal to 1:2.5, but in this case it is necessary to introduce amendments to the readings of the standard measuring instrument in order to fulfill the requirements specified above.

4. The frequency and measurement ranges of standard measuring instruments must include the corresponding ranges of the device being tested.

(Changed edition, Amendment No. 1).

2. CONDITIONS OF VERIFICATION AND PREPARATION FOR IT

2.1. When conducting verification, the following conditions must be met:

Ambient temperature:

(20±2) °C - for accuracy classes 0.05-0.5;

(20±5) °C - for accuracy classes 1.0-5.0;

relative air humidity 30-80%;

atmospheric pressure 84-106 kPa.

Normal values of other influencing quantities and permissible deviations are in accordance with GOST 8711 and GOST 8476.

2.2. The devices being verified must be prepared for operation in accordance with the technical documentation (hereinafter referred to as TD) for devices of specific types.

2.1, 2.2. (Changed edition, Amendment No. 1).

2.3. The device can be verified without interchangeable auxiliary parts.

2.5. Instrument readings are taken in a direction perpendicular to the scale.

2.7. Three-phase devices are verified at symmetrical voltage and uniform phase load according to GOST 8476.

Note. Three-phase multi-element wattmeters can be verified in a single-phase connection circuit (with current circuits connected in series and voltage circuits connected in parallel), if such an indication is included in the TD for devices of specific types.

2.8. Direct and alternating current devices are verified as follows:

2.8.1. Devices certified as exemplary are verified at the type of current at which they are used.

2.8.2. Devices used as workers are tested on direct and alternating current.

2.8.3. During periodic verification, working electrodynamic devices with a frequency of up to 100 Hz can only be checked using direct current.

(Changed edition, Amendment No. 1).

where is the final frequency of the range of normal frequency values of the device being tested;

- the initial frequency of the range of normal frequency values of the device being tested.

Note. If the device is used at certain frequencies within the frequency range, then during operation and storage verification is carried out at these frequencies. When devices are released from production and after repair, verification is carried out at one frequency within the range of normal frequency values and at the extreme frequencies of the range.

2.12. Multi-range instruments can be verified at all numerical scale marks in only one measurement range; in the remaining ranges, it is sufficient to carry out verification at two scale marks: at the numerical mark corresponding to the standard scale value, and at the numerical mark at which the maximum error is obtained on the fully verified measurement range.

Multi-range instruments used as reference instruments are verified at all numerical scale marks on the measurement ranges in which they are used. On other ranges they are checked at two scale marks, as indicated above.

Instruments with several scales or instruments measuring several quantities must be verified on each scale and for each measured quantity separately.

Instruments with a double-sided scale are checked at all numerical marks on the left and right sides of the scale.

2.13. Working panel devices can be verified without dismantling from the switchboard or panel using electrically switching elements that do not affect the metrological characteristics of the devices.

2.15. Before verification, the following preparatory operations must be performed.

2.15.1. The pointer of the device being tested is set by a mechanical corrector to the zero mark of the scale with the current and voltage circuits disconnected.

Note. During the verification process, it is not allowed to reset the pointer to the zero mark.

2.15.2. The devices are connected to the circuit and warmed up in order to establish an operating mode for the time and under the loads specified in the TD for specific types of devices. If the TD does not provide for a warm-up time, the devices are not preheated and the main error is determined immediately after connecting the device to the circuit.

2.15.4. Devices that have controls, settings and corrections are pre-configured or adjusted in accordance with the requirements of technical documentation for devices of specific types.

3. SAFETY REQUIREMENTS

3.1. When calibrating devices, the electrical safety requirements in accordance with GOST 12.1.006, GOST 12.3.019 and GOST 12.2.007.0 must be met. In this case, the “Rules for the technical operation of consumer electrical installations” * and the “Safety rules for the operation of consumer electrical installations” **, approved by Gosenergonadzor, must be observed.
________________
* In the territory Russian Federation the document is not valid. The "Rules for the technical operation of consumer electrical installations" are in effect;
** The document is not valid on the territory of the Russian Federation. The “Inter-industry rules for labor protection (safety rules) during the operation of electrical installations” are in force (POT R M-016-2001, RD 153-34.0-03.150-00). - Notes from the database manufacturer.

4. VERIFICATION

4.1. Visual inspection

During an external inspection of the device, the following must be installed:

no external damage or damage to the scale coating;

clarity of all inscriptions in accordance with GOST 8711 and GOST 8476;

completeness of the device with spare parts and accessories necessary for verification.

4.2. Testing

When testing, reliable fastening of the device clamps, smooth operation and clear fixation of the switches must be established.

4.3. Checking electrical strength and insulation resistance

4.3.1. Electrical strength and insulation resistance are checked according to GOST 8711 for ammeters and voltmeters and according to GOST 8476 for wattmeters and varmeters using an installation whose technical characteristics are given in Appendix 2.

The electrical insulation resistance should not be less than the value established in GOST 8711 for ammeters and voltmeters and in GOST 8476 for wattmeters and varmeters.

Note. It is allowed to check the electrical strength of insulation on direct current, if this is provided in the TD for devices of specific types.

(Changed edition, Amendment No. 1).

4.4. Determination of the main error, variation of readings and residual deviation of the instrument pointer from the zero mark

4.4.1. The main error and variation of readings of single-range instruments of accuracy classes is 0.05; 0.1 and 0.2 are determined at each numerical mark on the scale.

Note. For instruments with an accuracy class of 0.5 and less accurate, as well as for instruments with a uniform scale with more than 10 numerical marks, it is allowed to determine the main error and variation of readings only at five scale marks, evenly distributed over the measurement range.

(Changed edition, Amendment No. 1).

4.4.2. The main error of instruments as a percentage of the normalizing value is calculated using the formula

where is the value of the measured quantity, determined from the readings of the device being verified;

The actual value of the measured quantity, determined from the readings of a standard measuring instrument;

Standard value.

The main error of the device being verified should not exceed the limit of permissible main error according to GOST 8476 and GOST 8711.

4.4.3. The variation of instrument readings at the scale mark being checked is defined as the absolute value of the difference between the actual values of the measured quantity for the same instrument reading, obtained by smoothly moving the pointer first from the side of smaller and then from the side of large values with a constant current polarity.

For devices tested in two directions of current, the largest of the obtained values is taken as the variation at each point on the scale. The variation is determined based on the measurement results obtained when determining the main error.

The variation in readings of working instruments should not exceed the values established in GOST 8711 and GOST 8476. The variation in the readings of instruments certified as exemplary ones should not exceed half the values of the maximum permissible basic error of these instruments.

4.4.4. To determine the residual deviation of the pointer from the zero mark, the position of the pointer of the device being tested should be noted after a smooth decrease in the value of the measured quantity from the final scale mark to zero.

The residual deviation of the instrument pointer from the zero scale mark should not exceed the values specified in GOST 8711 and GOST 8476.

4.4.5. Direct and alternating current devices of accuracy classes 0.05 and 0.1 and devices of accuracy classes 0.05; 0.1; 0.2 and 0.5, certified as exemplary, must be verified in two directions of direct current when the readings decrease and increase.

If it is necessary to determine corrections, the main error of the device being verified is determined for each scale mark being checked as the arithmetic mean of four error values.

None of the error values obtained from four measurements should exceed the value of the maximum permissible basic error of the device being verified.

4.4.5.1. Devices not specified in clause 4.4.5 must be verified in one direction of direct current. The error of such devices is determined by smoothly moving the pointer to each checked scale mark from the side of smaller and larger values of the measured quantity.

None of the error values obtained from two measurements should exceed the permissible error limit of the device being tested.

If it is necessary to determine corrections, the main error of the device being verified is determined for each scale mark as the arithmetic mean of two error values.

(Changed edition, Amendment No. 1).

4.4.6. DC verification

2. Ammeters, voltmeters and wattmeters of accuracy class 0.5, certified as exemplary ones, may be verified by direct comparison only with ammeters, voltmeters and wattmeters of accuracy class 0.1.

3. Ammeters of accuracy classes 1.0-5.0 can be verified by direct or indirect measurements.

4. Voltmeters of accuracy classes 1.0-5.0 can be verified by direct measurements.

(Changed edition, Amendment No. 1).

4.4.7. AC verification

4.4.8. Ammeters, voltmeters, wattmeters of accuracy classes 0.1-0.5, certified as exemplary ones, should be verified according to paragraphs 4.4.6 and 4.4.7.

4.4.9. The results of verification of instruments of accuracy classes 0.05-0.5 are entered into a protocol, the form of which is given in Appendix 1.

The results of verification of portable instruments of accuracy classes 1.0-5.0 are documented in a free-form protocol.

Note. In the case of using automatic verification installations with registration of the error of the instruments being verified in digital form on a digital printing device, the verification protocol is filled out in the form specified in the TD for the installation.

(Changed edition, Amendment No. 1).

5. REGISTRATION OF VERIFICATION RESULTS

5.1. Positive results must be documented:

primary verification - by an entry in the device passport, certified in the manner established by the manufacturer;

periodic state verification of model instruments - issuing a certificate in the form established by Gosstandart and applying a verification stamp in a place that excludes access to the inside of the device. On the reverse side of the certificate, the type of current at which the device is verified and the variation of the device readings are indicated;

periodic departmental verification of standard instruments - issuing a verification certificate drawn up by the departmental metrological service and applying a verification mark. On the reverse side of the certificate, the type of current at which the device is verified and the variation of the device readings are indicated;

periodic state and departmental verification of working instruments - by imprinting a verification mark.

APPENDIX 1 (Mandatory) Verification protocol form

ANNEX 1
Information


PROTOCOL N_________

	device name
owned
		owner organization

Manufacturer			Device system*	Device class	Measurement limits

Verification means:

Verification conditions:

temperature __________________________ °C

humidity _________________________%

pressure __________________________ kPa.

Preheat the device __________ min.

Verification results:

Device being verified

Exemplary device

Basic error of the device being tested**

Variation of indications**

Countdown
on a scale, division

Indication**

Scale reading in forward direction of current, division

Scale reading with reverse direction of current, division

Actual value**

Average
meaning

The variation in instrument readings does not exceed

The residual deviation of the instrument pointer from the zero scale mark is

Conclusion

pass, fail

name of the organization that carried out the verification

Conducted verification

Full Name

________________
* Magnetoelectric, electrodynamic, electromagnetic.

** In units of the measured value.

APPENDIX 2 (Informative) Main technical characteristics of the installation for testing the electrical insulation strength

APPENDIX 2
Information


	Test voltage, kV	Installation power, kVA, not less
	From 0.5 to 3

The adjusting device must allow smooth adjustment of the voltage from zero to the maximum value of the test voltage.

The voltage setting error is in accordance with section 4 of GOST 22261 and section 3 of GOST 8476 and GOST 8711.

When testing devices on direct current converted from alternating current, the voltage ripple coefficient should be no more than 10%.

Electronic document text
prepared by Kodeks JSC and verified against:
official publication
M.: IPK Standards Publishing House, 2005

State system for ensuring the uniformity of measurements. Ammeters, voltmeters, wattmeters, varmeters. Verification method. Registration of verification results

GOST 8.497-83 (ST SEV 1709-79) GSI. Ammeters, voltmeters, wattmeters, varmeters. Methods and means of verification (With Change No. 1)

State system for ensuring the uniformity of measurements. Ammeters, voltmeters, wattmeters, varmeters. Verification method

Text GOST 8.497-83

Other GOSTs

1. Operations and means of verification

2. Verification conditions and preparation for it

3. Safety requirements

4. Conducting verification

5. Registration of verification results

Main technical characteristics installations for testing electrical insulation strength

2. CONDITIONS OF VERIFICATION AND PREPARATION FOR IT

3. SAFETY REQUIREMENTS

4. VERIFICATION

5. REGISTRATION OF VERIFICATION RESULTS

APPENDIX 1 (Mandatory) Verification protocol form

APPENDIX 2 (Informative) Main technical characteristics of the installation for testing the electrical insulation strength

Main technical characteristics
installations for testing electrical insulation strength