General Information:
Earth Resistance/Soil Resistivity Tester is specially designed and manufactured for ground resistance, the testing current reaches 20mA. The digital and micro-processing technology, precision 3-wire method and simple 2-wire method are used to measure ground resistance, importing FFT (Fast Fourier Transform) technology, which is widely used in electric power, telecommunications, meteorology, oil field, construction, lightning protection, industrial electrical equipment and other earth resistance, earth voltage measurement.
Also called: Precision Ground Resistance tester
Four-wire Ground Resistance Tester
Two/three/four wire ground resistance tester
Soil resistivity tester
 
Features: 

• ♦ Large LCD display with backlight and bar graph indication.
• ♦ Can store 2000 sets of data.
• ♦ Historical data reading, viewing, saving, reporting, printing.

 
Specification:
 

Function	Ground resistance, soil resistivity test; ground voltage, AC voltage test.
Power	DC 7.4V 1.8Ah rechargeable Li-battery, battery full charge time 8h.
Back light	Controllable white screen backlight, suitable for use in dark field.
Testing method	Precision four wire, three wire method and simple two wire method to test grounding resistance
Measure method	Earth Resistance: rated current change-pole method, measuring current 20mA max. Soil resistivity: four-pole method (Winner method)
	Earth Voltage: average rectification (between P(S)-ES)
Range	2/3/4 wire method for measuring ground resistance (R)：0.00Ω～3000Ω
	Soil Resistivity(ρ)：0.00Ωm～9000kΩm
	Grounding voltage：AC 1～100.0V
Max. resolution	0.01Ω; 1V
Accuracy	2/3/4 wire method for measuring ground resistance (R)： ±2%rdg±0.05Ω（0.000Ω～29.999Ω） ±2%rdg±3dgt （30.00Ω～2999.9Ω） ±4%rdg±3dgt （3000Ω～30000Ω）
	Soil Resistivity(ρ)：depending to the measuring precision of R （ρ=2πaR  a:1 m～100m；π=3.14）
	Grounding voltage： ±2%rdg±3dgt
	Note: 1. The Additional error at rC maxor rP max≤±5%rdg±5dgt.b (rC max:4kΩ+100R＜50kΩ, rP max:4kΩ+100R＜50kΩ) 2. 5V The Additional error at interference voltage ≤±5%rdg±5dgt。
Testing voltage wave shape	sine wave
Testing frequency	128Hz/111Hz/105Hz/94Hz (auto select frequency)
Short circuit test current	AC 20mA max
Open circuit test voltage	AC 40V max
Electrode distance range	1m～100m
Switch	Ground resistance: 0.000Ω～30000Ω auto switch
	Soil resistivity: 0.00Ωm～9000kΩm auto switch
LCD	6” LCD display, white screen backlight
LCD size	128mm×75mm
LCD display size	124mm×67mm
Testing indication	LED flashing indication in measurement. LCD count down. Progress bar chart indication
Size	Host machine：Length Width Height 320mm×275mm×145mm
	Outer size：Length Width Height 400mm×245mm×335mm
Standard test wire	Total 4pcs：red wire 15m，black wire 15m, yellow wire 10m，green wire 5m, each 1pcs
Simple test wire	Total 2pcs：red wire 1.6m，black wire 1.6m each 1pcs
Auxiliary grounding rod	4 pcs：φ10mm×150mm
Test time	Ground voltage: approx 2times/sec Ground resistance：approx 5sec/time Soil Resistivity: approx 5sec/time
Test times	5000times above (short circuit test, test 1 time, Stop for 30 seconds and retest. )
Circuit voltage	Below AC 600V
Communication port	With RS232 interface, storage data can be uploaded to the computer and saved to print.
communication wire	RS232 communication wire 1pcs, length 1.5m
Data HOLD	The "HOLD" symbol indicates data is kept.
Data save	2000 SET，“MEM”Storage instructions，display “FULL”Indicates that the storage is full.
Data read	the "READ" symbol indicates look up data
Overflow display	Exceeding measuring range overflow function: “OL” icon display
Interface test	Recognize interference signal automatically, “NOISE” icon display when interference voltage exceed 5V
Alarm function	When measuring value exceeds alarm setting value, there is “Toot-toot-toot” alarm hint
Battery voltage	When low battery, battery voltage low icon will display, reminding to charging battery.
Working current	Standby: about 25mA (Backlight shut off)； backlight：25mA Max(only backlight consumption)； Measurement: about 150mA (Backlight shut off)
Weight	Host machine：2.66kg(with battery)
	Total weight：6.88kg(with package)
Tool box	The military toolbox is designed to support pressure 200kg.
Working humiture	-10℃～40℃, 80%rh below
Storage humiture	-20℃～60℃, 70%rh below
Overload protection	Measure ground resistance ：C(H)-E、P(S)-ES between each port AC 280V/3sec
Insulation resistance	20MΩ above(between circuit and shell 500V)
Withstand voltage	AC 3700V/rms(between circuit and shell)
Electromagnetic features	IEC61326(EMC)
Comply standard	IEC61010-1(CAT Ⅲ 300V, CAT IV 150V, pollution class2) IEC61010-031, IEC61557-1(ground resistance) IEC61557-5(soil resistivity)