Zero Offset Verification
This procedure checks the instrument’s zero offset performance. 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 below.
1. Make sure you have read Test Considerations.
2. Install the 34172B Calibration Short (or equivalent) on the front-panel input terminals. Select the Front input
terminals with the Front/Rear switch.
3. Configure each function and range in the order shown in the table below. Make a measurement and return the
result. Compare measurement results to the test limits shown below.
4. Install the 34172B Calibration Short (or equivalent) on the rear-panel input terminals. Select the Rear input
terminals with the Front/Rear switch.
5. Configure each function and range in the order shown in the table below. Make a measurement and return the
result. Compare measurement results to the test limits shown below.
Values for 34461A DMM
Error from Nominal
Input Function
[1]
Range Quick
Check
24 hours 90 days 1 year 2 years
Open DC Current 100 µA Q ± 0.02 µA ± 0.025 µA
1 mA ± 0.060 µA
10 mA ± 2 µA
100 mA ± 4 µA ± 5 µA
1 A ± 60 µA ± 100 µA
3 A ± 600 µA
10 A ± 1 mA
Short DC Volts 100 mV Q ± 3 µV ± 3.5 µV
1 V ± 6 µV ± 7 µV
10 V ± 40 µV ± 50 µV
100 V ± 600 µV
1000 V ± 6 mV ± 10 mV
Short 4-wire Ohms 100 Ω ± 3 mΩ ± 4 mΩ
1 kΩ ± 5 mΩ ± 10 mΩ
10 kΩ Q ± 50 mΩ ± 100 mΩ
100 kΩ ± 500 mΩ ± 1 Ω
1 MΩ ± 10 Ω
10 MΩ ± 100 Ω
314 Agilent Truevolt Series DMM Operating and Service Guide
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