Calibration Procedures 3
Keysight 34980A Service Guide 43
Internal DMM Verification Tests
Zero Offset Verification
This procedure is used to check the zero offset performance of the internal DMM.
Verification checks are only performed for those functions and ranges with unique
offset calibration constants. Measurements are checked for each function and
range as described in the procedure on the next page.
Zero Offset Verification Procedure
1 Make sure you have read “DMM Test Considerations” on page 42.
2 Short all the inputs on the input test connector (see page 40).
Leave the Current input open. Connect the shorts as close to the input
connector as possible.
3 Select each function and range in the order shown in the table below. Make a
measurement and return the result. Compare measurement results to the
appropriate test limits shown in the table.
Quick
Check
Error from Nominal
Input
Function
[1]
Range 24 hour 90 day 1 year
Open
DC Current
10 mA ± 1 µA ± 2 µA ± 2 µA
Open 100 mA Q ± 4 µA ± 5 µA ± 5 µA
Open 1 A ± 60 µA ± 100 µA ± 100 µA
Short
DC Volts
100 mV ± 3.5 µV ± 4 µV ± 4 µV
Short 1 V ± 6 µV ± 7 µV ± 7 µV
Short 10 V Q ± 40 µV ± 50 µV ± 50 µV
Short 100 V ± 600 µV ± 600 µV ± 600 µV
Short 300 V ± 6 mV ± 9 mV ± 9 mV
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