4 Calibration Procedures
88 Keysight 34970A/34972A Service Guide
Internal DMM Adjustments
You will need a 34901A 20-Channel Multiplexer to perform the following
procedures (see page 69). Install the Multiplexer in slot 200.
Zero Adjustment
Each time you perform a zero adjustment, the Internal DMM stores a new set of
offset correction constants for every measurement function and range. The
Internal DMM will sequence through all required functions and ranges
automatically and store new zero offset calibration constants. All offset
corrections are determined automatically. You may not correct a single range or
function without re-entering ALL zero offset correction constants automatically.
This feature is intended to save calibration time and improve zero calibration
consistency.
Zero Adjustment Procedure
The zero adjustment procedure takes about 5 minutes to complete. Be sure to
allow the instrument to warm up for 2 hours before performing the adjustments.
Follow the steps outlined below. Review “Test Considerations” on page 76 before
beginning this test. Also see page 56, for an example of how to initiate a zero
calibration.
1 This procedure will use the copper shorts installed on Channels 209 and 219.
Leave the Amps input connections (Channel 221) open.
2 Select Channel 209. Select the DC VOLTS function.
3 Press
to enter the calibration menu. Press
again to begin the
adjustment procedure.
4 Use the knob and arrow keys to set the number in the display to 0.000000 and
press .
5 Perform the Zero Offset Verification tests (see page 80) to check zero
calibration results.
Never turn off the Internal DMM during Zero Adjustment.This may cause ALL
calibration memory to be lost.
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