VD-3002 Double Clamp Multifunction Digital Earth Tester Ground Earth Resistance Tester 

Function Ground resistance、Soil resistivity、DC resistance、Ground voltage、AC current
Ambient temperature and humidity 23℃±5℃，below 75%rh
Interference voltage <;20V (should be avoided)
Interference current <;2A (should be avoided)
Measure R electrode spacing a＞5d
Measured ρelectrode spacing a＞20h
Power DC 6V 4.5Ah lead-acid battery lasts more than 100 hours standby
Backlight Controllable backlight, suitable for use in dim places
measurement mode Precise four-wire、 three-wire measurement, simple two-wire measurement、Selection method, double clamp method for measuring grounding resistance
Measurement methods 2.3.4-wire method measurement: Polarization method, measuring current 20mA Max
Soil resistivity: four-pole method
Selectivity Measurement: Polarization Method, Measuring Current 20mA Max
Double clamp method: non-contact mutual inductance measurement method, test current 1mA Max
DC resistance: polarization method
AC current: average rectification (clamp)
Ground Voltage: Average Rectification(between S-ES interface)
Test voltage waveform Sine wave
Test frequency 128Hz
Short circuit test current AC 20mA max
Open circuit test voltage AC 28V max
Electrode spacing range 1m～100m
Display mode 4-bit large LCD display, with backlight
Measurement instructions LED flashing indicator during measurement

LCD size 111mm×68mm
LCD display field 108mm×65mm
Instrument size L/W/H：277.2mm×227.5mm×153mm
Clamp size L/T/H：101mm×27mm×214mm
Test line 4 strips：red 15m，black 15m, yellow 10m，green 10m each one
Simple test line 2strips：yellow 1.5m，green 1.5m each one
Auxiliary Grounding rod 4PCS：φ10mm×200mm
Current clamp 2PCS：φ4 mm Banana plug
Current clamp diameter φ50mm
Current clamp lead Length 2m
Measure time AC current：about 2 times/sec;
Ground voltage：about 2 times/sec;
grounding resistance、soil resistivity: about 7 seconds/time