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

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

Instrument size

L/W/H：277.2mm×227.5mm×153mm

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

Line voltage

Measurement below   AC100V (ground voltage measurement function cannot be used to measure   commercial power)

Communication Line

One USB communication   line, 1.5m long

Data storage

500 groups,   "MEM" storage indicates, flashing "FULL" symbol indicates   that the memory is full

Data review

Data review function:   "MR" symbol display

Overflow display

Over-range overflow   function: "OL" symbol display

Current clamp low current indication

When measuring by the   selection method or the double-clamp method, when the current signal received   by the current clamp A is lower than 0.5 mA, the symbol “    ” is displayed, and at this time, the clamping   direction of the current clamp A should be checked.

Interference test

Automatic   identification of interference signals, "NOISE" symbol indication   when the interference voltage is higher than 5V

Auxiliary grounding test

With auxiliary ground   resistance test function, 0.00KΩ ~ 30kΩ (Rh max =   3kΩ +100R <50kΩ; Rs max = 3kΩ +100R <50kΩ)

Alarm function

Alarm when the measured   value exceeds the alarm setting value

Battery voltage

Real-time display of   battery power, reminding timely charging when battery voltage is low

Automatic Shutdown

“APO” Indicates,   automatic Shutdown After 15 Minutes

Power consumption

Standby: 40mA   Max(Backlight off)

Turn on backlight:   43mA Max

measuring：120mA   Max(Backlight off)

Insulation resistance

More than 20MΩ(500V   between circuit and housing)

Pressure resistance

AC 3700V/rms(between   circuit and housing)

Electromagnetic properties

IEC61326(EMC)

Suitable for safety regulations

IEC61010-1(CAT Ⅲ 300V、CAT IV 150V、pollution level 2)；

IEC61010-031；

IEC61557-1(grounding   resistance)；

IEC61557-5(soil   resistivity)；

JJG 366-2004.

JJG 366-2004(ground   resistance meter)；

JJG 1054-2009(Clamp   grounding resistance meter).