62 34980A Service Guide
3 Calibration Procedures
Internal DMM Adjustments
You will need a test input fixture to adjust the internal DMM
(see page 54).
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 “DMM Test Considerations" on page 55 before
beginning this test.
1 This procedure will use the copper shorts installed on input test connector. Leave the
Current input connection open.
2 Set the DC VOLTS function.
3 Send the value 0.000000 to the instrument using the CALibration:VALue
0.000000
command.
4 Calibrate the instrument using the CALibration? command.
5 Perform the “Zero Offset Verification" on page 55 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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