Agilent 34970A/34972A Data Acquisition / Switch Unit

Chapter 4 Calibration Procedures
Internal DMM Adjustments
Internal DMM Adjustments
You will need a 34901A 20-Channel Multiplexer to perform the following
procedures (see page 76). 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.
Note: Never turn off the Internal DMM during Zero Adjustment.This
may cause ALL calibration memory to be lost.
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
81 before beginning this test. Also see page 63, for an example of how to
initiate a zero calibration.
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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 85) to check zero
calibration results.
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