AEMC 6422 User Manual page 34

3.2.2 Resistance Measurement (2P)
Additional reference conditions:
External voltage between H and E terminals = zero.
Resistance of the leads ≤ 0.1Ω.
Measurement
range
Resolution
Intrinsic
± (2% R + 10 ct) ± (2% R + 2 ct)
uncertainty
U no-load
HE
voltage
The compensation of the leads of the Model 6424 may result in a negative
reading of up to 5Ω.
3.2.3 Ground Resistance Measurement (3P)
Additional reference conditions:
Resistance of the E lead: ≤ 0.1Ω
R (rod + lead) ≤ 100Ω
H
R (rod + lead) ≤ 1kΩ
S
Spurious voltages on U
Model 6422 Ground Measurement
Measurement
range
Resolution
Intrinsic
uncertainty
Measurement
frequency
No-load voltage
Model 6424 Ground Measurement
Measurement
range
Resolution
Intrinsic
± (1% R + 10 ct) ± (1% R + 2 ct)
uncertainty
Measurement
frequency
No-load
voltage
The measurement current is a square signal of not more than 20mA.
34
0.05 - 99.99Ω
0.01Ω
and U
HE SE
0.50 - 99.99Ω
0.01Ω
± (1% R + 10 ct) ± (1% R + 2 ct)
0.50 - 99.99Ω
0.01Ω
128Hz, or 256Hz if the spurious voltage is at 128Hz
80.0 - 999.9Ω 0.800 - 9.999kΩ 8.00 - 50.00kΩ
0.1Ω
±10V
PEAK
≤ 0.01V
80.0 - 999.9Ω
0.1Ω
128Hz or 256Hz
±10V
PEAK
80.0 - 999.9Ω 0.800 - 9.999kΩ 8.00 - 50.00kΩ
0.1Ω
±10V
PEAK
Ground Tester Models 6422/6424
1Ω
± (2% R + 1 ct) ± (2% R + 1 ct)
0.800 – 2.000kΩ
1Ω
± (1% R + 1 ct)
1Ω
± (1% R + 1 ct) ± (1% R + 1 ct)
10Ω
10Ω