XITRON 2000I, Руководство пользователя

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Calibration and Maintenance 61
Calibration and Maintenance
This chapter describes the procedures for internal calibration, external
calibration, periodic maintenance and internal maintenace of the 2000I and
2000M DC power source instruments.
Internal Calibration
The internal calibration procedure ensures the 2000 instrument’s low-level
DC voltage and current specifications are maintained. Perform an internal
calibration on a periodic basis at 30 day intervals or less and in conditions
where the ambient temperature has changed by more than 5ºC. If the
instrument is in use as a transfer standard between sites, perform the internal
calibration at both sites.
This sequence performs an operational confidence check of the analog and
digital circuitry and then performs an internal calibration of the zero offsets.
The internal calibration sequence is described below:
•
To perform an internal calibration:
1. Press the MNU key. The display will prompt you to select either
“Standby” or “Operate” mode.
2. Select neither mode by continuing to press any of the arrow keys until the
INTERNAL CALIBRATION choice is displayed:
< Internal Cal >
3. Press any of the Units/Enter keys (V, A, ºC or ºF
)
to select Internal Cal.