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5.1 ELECTRICAL
Measurement Range: Auto-ranging 0 to 2000 Ω
Range
Measurement
Resolution
Test Current
Accuracy
Open Voltage
Operating Frequency: 128 Hz square wave
Max. Auxiliary Rod Resistance:
Range
Current Circuit
Voltage Circuit
Response Time: 4 to 8 seconds approx for a stabilized measurement
Interference:
The Models 4620 & 4630 are designed to reject high levels of interference
voltage (DC, 50/60 Hz, harmonics)
■ DC voltage in series with X: 20 V
■ AC voltage in series with Y: 13 Vpeak (@ 16.67, 50, 60, 400 Hz)
■ AC voltage in series with Z: 32 Vpeak (@ 16.67, 50, 60, 400 Hz)
Accuracies and specifications are given for an ambient temperature of 23°C ±3°K, RH of 45
to 55%, battery power at 9.5 V, auxiliary resistance at the measurement terminals = 0, no
stray voltage, an electrical field < 1 V/m, and a magnetic field from 0 to 40 A/m.
Voltage Detection Range:
20 to 250 Vac between the X and Z terminals or between the Xv and Z terminals.
Frequency: DC at 450 Hz
Voltage Withstanding:
Both models are fuse protected. In the event of a system fault, the units can
withstand 250 Vac or 100 Vdc.
Fuse Protection: High breaking capacity - 0.1 A, >250 V, 0.25 x 1.25"
36
5. SPECIFICATIONS
20 Ω
0 to 19.99 Ω
10 mΩ
10 mA
2% of Reading ± 1 ct
20 Ω
3 kΩ
Digital Ground Resistance Tester Models 4620 & 4630
200 Ω
20 to 199.9 Ω
100 mΩ
1 mA
<42 Vpeak
200 Ω
30 kΩ
50 kΩ
2000 Ω
200 to 1999 Ω
1 Ω
0.1 mA
±5% of Reading ± 3 cts
2000 Ω
50 kΩ
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