3 Performance Verification
72 Keysight DAQ970A/DAQ973A Service Guide
Ohms gain verification test
DC current gain verification test
Input
Channel 302
Quick
check
[a]
Error from nominal
Function
[b]
Range 24 hours 90 days 1 year 2 years
100 Ω
4-wire
ohms
[c]
100 Ω ±8 mΩ ±11 mΩ ±12 mΩ ±13 mΩ
1 kΩ 1 kΩ Q ±27 mΩ ±37 mΩ ±47 mΩ ±57 mΩ
10 kΩ 10 kΩ ±250 mΩ ±350 mΩ ±450 mΩ ±550 mΩ
100 kΩ 100 kΩ ±2.5 Ω ±3.5 Ω ±4.5 Ω ±5.5 Ω
1 MΩ 1 MΩ ±25 Ω ±65 Ω ±75 Ω ±85 Ω
10 MΩ 10 MΩ ±1.1 kΩ ±2.1 kΩ ±2.60 kΩ ±3.1 kΩ
10 MΩ
2-wire
ohms
[d][e]
10 MΩ Q ±1.1 kΩ ±2.1 kΩ ±2.60 kΩ ±3.1 kΩ
100 MΩ
100 MΩ
[f]
±101 kΩ ±251 kΩ ±351 kΩ ±401 kΩ
[a] Q: Quick performance verification test points.
[b] For Channel 321, select NPLC 10.
[c] Fluke 5720A/5730A calibrator: Enable [EX SNS] (external sense) for 4-wire ohms measurement.
[d] For 2-wire ohms, use Math NULL, otherwise an additional 2 Ω error must be added.
[e] Fluke 5720A/5730A calibrator: Enable 2-wire ohms compensation (for 2-Wire ohms measurement ≤110 kΩ).
[f] The 100 MΩ range is for 2-wire ohms only.
Input
Channel 321
Quick
check
[a]
Error from nominal
Function
[b]
Range 24 hours 90 days 1 year 2 years
1 A
DC current
1 A Q ±560 μA ±800 μA ±900 μA ±1.1 mA
100 mA 100 mA ±14 μA ±35 μA ±55 μA ±65 μA
10 mA 10 mA Q ±2.7 μA ±5 μA ±7 μA ±8 μA
1 mA 1 mA ±100 nA ±350 nA ±550 nA ±650 nA
[a] Q: Quick performance verification test points.
[b] For Channel 321, select NPLC 10.
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