Perform scheduled calibration tests in the field on revenue and indicating meters. Items below are on the recommended standard maintenance schedule for metering. Inspect meters for physical damage; inspect cover glass, cover gasket, presence of foreign material and moisture, condition of spiral spring, disc clearance, contacts and case grounds.
Check mechanically for freedom of movement, proper travel and alignment, and tightness of mounting hardware and tap plugs.
Perform series full-load and light-load tests on each revenue meter function by secondary injection method. Calibrate to 0.5 percent accuracy on WATT functions and 1.0 percent accuracy on VAR functions.
Perform a calibration check of indicating meters and recorders by secondary current and voltage injection. Record as found current and voltage transformer ratio settings.
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