3 Calibration Procedures
98 Keysight 34420A Service Guide
Zero Calibration
A new set of zero offset correction constants are stored each time a zero
calibration is performed. Each channel, function, and range has a unique offset
correction. Once the procedure is started, the meter will automatically sequence
through all the required input channels, functions, and ranges and store a new
zero offset constant for each.
You may not perform a zero calibration for a single input channel, function or
range. All zero offset constants are determined when a zero calibration is begun.
As a part of the Zero Calibration, the input amplifier bias current is minimized. This
error current is dependent upon temperature. You should perform the Zero
Calibration procedures whenever the meter is used in environments with
temperatures greater than ±5° C from the calibration temperature.
Zero Calibration Procedure
The automatic zero calibration takes approximately 10 minutes to complete.
The procedure is outlined below. You should review “Test Considerations” on
page 78 before beginning this procedure.
1 Set the meter to the following configuration:
61/2 digits (10 PLC)
Channel 1 DCV
Filters OFF
2 Connect the low thermal 4-wire shorting plug to the meter's input terminals.
Ensure the connector coupling nut is properly tightened.
3 Allow 5 minutes for the thermal shorting plug and input connector to
temperature stabilize.
4 Turn on the menu and select G:CAL menu.
5 Move to the commands level and select 2:CALIBRATE.
6 Move down to the parameters level and set the value shown to 0.000,000,0 V.
7 Execute the command to begin the automatic zero calibration. The calibration
will take approximately 10 minutes to complete. The display will indicate the
calibration progress as each channel, range, and function is calibrated.
8 Perform the Zero Offset Verification procedure (page 81) to check the results.
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