Rating Instruments and Equipment

DOE-HDBK-1092-98

2.13.4.7.3 RATING INSTRUMENTS AND EQUIPMENT

Test instruments and equipment and their accessories shall be rated for the circuits and equipment

to which they will be connected and shall be suitable for the environment in which they will be used.

2.13.4.7.4 CALIBRATION OF ELECTRICAL INSTRUMENTS

The American National Standards Institute (ANSI) standard C39.1 defines the minimum performance

and general requirements level for electrical instruments. ANSI standards also ensure that an

instrument, when calibrated to National Institute of Standards and Technology (NIST) traceable

standards, is capable of transferring that quality of measurement to field conditions within specified

limits, where that level of measurement quality is needed.

A record should be maintained for each instrument, by serial number or equivalent method, showing

dates of inspection, calibration data as received, the date when it should be recalled from the field

and a recalibration check made, and any interim repairs. After a period of time, it should become

obvious what frequency needs to be established for calibrating each instrument.

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