ADC and Zero Adjustments
Each time you perform a zero adjustment, the instrument stores a new set of offset correction constants for every
measurement function and range. The instrument 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.
Never turn off the instrument during Zero Adjustment. This may cause ALL calibration memory to be lost.
ADC and Zero Adjustment Procedure
Be sure to allow the instrument to warm up and stabilize for 90 minutes before performing the adjustments.
1. Follow the steps outlined below. Review Test Considerations before beginning this test.
2. This procedure uses a low–thermal shorting block installed on the input connectors. Leave the Current input
connections open.
For the 34461A, two shorting blocks are recommended; one on the front panel and one on the rear panel.
A single shorting block can be used with the 34460A.
3. Select the front-panel input terminals. If using a single shorting block, install the block on the front-panel input
terminals.
4. Select the ADC adjustment mode ([Utility] > Test/Admin > Calibrate > Perform Cal > Perform ADC
Cal).
5. The display will show a message indicating that ADC calibration is in process. It will then display the results of the
ADC calibration. A Calibration Step Succeeded message indicates success; if the display shows Calibration Step
Failed, check the input value, range, function, and entered adjustment value and repeat the adjustment step.
Press Save Cal Values.
1. For DCV, ACV, 2-wire ohms, 4-wire ohms, DCI, and ACI, perform the following tasks (note that you must
remove the shorting block for DCI and ACI):
a. Select the measurement function.
b. Enter a calibration value of +0.
c. Press [Utility] > Test/Admin > Calibrate > Perform Cal > Perform Cal Step.
d. The display will show the functions and offset as the adjustments progress. The Zero Adjustment lasts
approximately two minutes. A Calibration Step Succeeded message indicates success; if the display shows
Calibration Step Failed, check the input value, range, function, and entered adjustment value and repeat
the adjustment step.
e. Press Save Cal Values.
6. Select the rear input terminals. If using a single shorting block, install the block on the rear-panel input terminals.
7. Repeat steps 4 through 6 for the rear input terminals.
8. Store the new ADC and Zero adjustment constants (see Storing the Calibration Constants).
9. Perform the Zero Offset Verification to check zero calibration results.
334 Agilent Truevolt Series DMM Operating and Service Guide
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