56 34980A Service Guide
3 Calibration Procedures
Zero Offset Verification Procedure
1 Make sure you have read “DMM Test Considerations" on page 55.
2 Short all the inputs on the input test connector (see page 54).
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.
[1] Select 6½ digit resolution.
[2] For 2-wire ohms using a multiplexer for the input connections, an additional 4
of error for the relay
contacts must be added.
Q: Quick performance verification test points.
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
Short 2-Wire Ohms
[2]
and 4-Wire
Ohms
100 ± 3.5 m ± 4 m ± 4 m
Short 1 k ± 6 m ± 10 m ± 10 m
Short 10 k Q ± 50 m ± 100 m ± 100 m
Short 100 k ± 500 m ± 1 ± 1
Short 1 M ± 10 ± 10 ± 10
Short 10 M ± 100 ± 100 ± 100
Short 100 M ± 10 k ± 10 k ± 10 k
Zero offset calibration using a multifunction calibrator is NOT
recommended. The calibrator and cabling offset can be large and
unstable causing poor offset calibration of the internal DMM.
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