10
Digital Ground Resistance Tester Model 3640 and 4610
CHAPTER 3
SPECIFICATIONS
3.1 Electrical
Measurement Ranges:Auto-ranging0to2000Ω
Range
20Ω 200Ω 2000Ω
Measurement
0 to 19.99Ω 20 to 199.9Ω 200 to 1999Ω
Resolution
10mΩ 100mΩ 1Ω
Test Current
10mA 1mA 0.1mA
Accuracy
2% of Reading ± 1ct 3% of Reading ± 3cts
Open Voltage
<42V peak
Operating Frequency:128Hzsquarewave
Max. Auxiliary Rod Resistance:
Range
20Ω 200Ω 2000Ω
Current Circuit
3kΩ 30kΩ 50kΩ
Voltage Circuit
50kΩ
Response Time: Approximately6secondsforastabilizedmeasurement
Interference: Models3640&4610aredesignedtorejecthighlevelsof
interferencevoltage(DC,50/60Hz,harmonics)
• DCvoltageinserieswithX:20V
• ACvoltageinserieswithY:13Vpeak
• ACvoltageinserieswithZ:32Vpeak
Accuracies and specications are given for an ambient temperature of 23°C ± 3°, RH of 45
to 55%, battery power at 8V, auxiliary resistance at the measurement terminals <200Ω, no
stray voltage and a magnetic eld from 0 to 40A/m.
Power Source: Eight1.5V“AA”batteries;Alkalinerecommended.
Battery Life: 180015-secondmeasurements
Low Battery Indicator: Ifthe“LoBat”indicatorlightsup,thebatteries
arelosingpower.T
heavailableoperatingtimeremainingis10015-second
measurements(approx).
Fuse Protection: Highbreakingcapacity-0.1A,>250V,0.25x1.25"
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