AEMC 3640 User Manual

10 Digital Ground Resistance Tester Model 3640 and 4610CHAPTER 3SPECIFICATIONS3.1 ElectricalMeasurement Ranges: Auto-ranging 0 to 2000ΩRange 20Ω 200Ω 2000ΩMeasurement 0 to 19.99Ω 20 to 199.9Ω 200 to 1999ΩResolution 10mΩ 100mΩ 1ΩTest Current 10mA 1mA 0.1mAAccuracy 2% of Reading ± 1ct 3% of Reading ± 3ctsOpen Voltage <42V peakOperating Frequency: 128Hz square waveMax. Auxiliary Rod Resistance:Range 20Ω 200Ω 2000ΩCurrent Circuit 3kΩ 30kΩ 50kΩVoltage Circuit 50kΩResponse Time: Approximately 6 seconds for a stabilized measurementInterference: Models 3640 & 4610 are designed to reject high levels ofinterference voltage (DC, 50/60Hz, harmonics)• DC voltage in series with X: 20V• AC voltage in series with Y: 13V peak• AC voltage in series with Z: 32V peakAccuracies and specifications are given for an ambient temperature of 23°C ± 3°, RH of 45to 55%, battery power at 8V, auxiliary resistance at the measurement terminals <200Ω, nostray voltage and a magnetic field from 0 to 40A/m.Power Source: Eight 1.5V “AA” batteries; Alkaline recommended.Battery Life: 1800 15-second measurementsLow Battery Indicator: If the “Lo Bat” indicator lights up, the batteriesare losing power. The available operating time remaining is 100 15-secondmeasurements (approx).Fuse Protection: High breaking capacity - 0.1A, >250V, 0.25 x 1.25"