Copy the input and the scale
For an analogue dial, send a photograph of the markings. For a digital unit, give the configured input and display scaling if known. Identify AC or DC, working points and frequency where applicable. Include the polarity and terminal identification from the manufacturer's documentation.
Meter alone or measuring chain?
List any external shunt or transformer by its ratio and asset tag. If it stays installed, describe the desired result as a meter input check rather than a calibration of that missing element. Record whether the meter can be removed by your authorised maintenance team.
A scale marked for the primary current
A panel dial may read to 200 A because the switchboard uses a 200/5 current transformer. If the dial is sent to a laboratory by itself, its input and indicated scale both belong on the job sheet. Give the scale exactly as printed and identify the transformer's ratio from the plant record. That lets the laboratory quote a result for the instrument as scaled and makes clear which transformer remains at the plant.
For an instrument verified at the installed panel, state which components the required result must cover. The plant's electrical team can identify the circuit and arrange authorised access to the measuring chain.
Reconcile the panel and bench tags
At IMT Sohna, a spare meter may be on the bench under a different tag from the installed display. Tell us which instrument will arrive and where its result will be filed.
Galvanometers and zero-centred indications
For a galvanometer, state whether it is used to read current or to detect a balance near zero. Include the scale markings, polarity, shunt or multiplier and the usual operating position. A null indication and a numerical current result are different requirements. Give the sensitivity or deflection points required by your procedure, with the connected circuit identified, so the method can be reviewed before the instrument is accepted.