Calibration Procedures 3
34980A Service Guide 57
Gain Verification
This procedure is used to check the “full scale” reading accuracy of the internal DMM.
Verification checks are performed only for those functions and ranges with unique gain
calibration constants.
DC VOLTS, Resistance, and DC CURRENT Gain Verification Test
1 Make sure you have read “DMM Test Considerations" on page 55.
2 Select each function and range in the order shown below. Provide the input shown in
the table below.
3 Make a measurement and return the result. Compare measurement results to the
appropriate test limits shown in the table. (Be certain to allow for appropriate source
settling when using the Fluke 5700A.)
[1] Select 6 ½ digit resolution.
[2] The 2-wire ohms resistance verification test is optional (see “Gain Adjustment Considerations" on
page 63). For 2-wire ohms using a multiplexer for the input connections, an additional 4
of error for the
relay contacts must be added. Add a 1-second channel delay when using Fluke 5700 in 2-wire
compensated mode. This avoids response time issues with 2-wire compensation when 34980A’s current
source contains a pulse.
[3] Verify only, no adjustment required.
Q: Quick performance verification test points.
Input Quick
Check
Error from Nominal
Function
[1]
Range 24 hour 90 day 1 year
100 mV DC Volts 100 mV ± 6.5 µV ± 8 µV ± 9 µV
1 V 1 V ± 26 µV ± 37 µV ± 47 µV
10 V 10 V Q ± 190 µV ± 250 µV ± 400 µV
100 V 100 V Q ± 2.6 mV ± 4.1 mV ± 5.1 mV
300 V 300 V ± 12 mV ± 19.5 mV ± 22.5 mV
100 2-Wire Ohms
[2]
and 4-Wire
Ohms
100 ± 6.5 m ± 12 m ± 14 m
1 k 1 k Q ± 26 m ± 90 m ± 110 m
10 k 10 k ± 250 m ± 900 m ± 1.1
100 k 100 k ± 2.5 ± 9 ± 11
1 M 1 M ± 30 ± 90 ± 110
10 M 10 M Q ± 1.6 k ± 2.1 k ± 4.1 k
100 M
100 M ± 310 k ± 810 k ± 810 k
10 mA DC Current 10 mA ± 1.5 µA ± 5 µA ± 7 µA
100 mA 100 mA Q ± 14 µA ± 35 µA ± 55 µA
1 A 1 A ± 560 µA ± 900 µA ± 1.1 mA
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