MEWOI4000D-High Performance Digital Earth resistance tester.similar Kyoritsu 4105A

OEM/ODM Testing Instruments Manufacturer

  • Main Features:: 1,Grounding resistance test,2,Grounding voltage test
  • Model No.:: MEWOI4000D
  • Name:: MEWOI4000D Digital Earth Resistance tester
Contact Us for QuotationEmail:mewoi@mewoi.comWhatsapp: +8618620373879
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MEWOI4000D Digital Earth Resistance Tester is elaborately designed and manufactured for the field measurement of grounding resistance, adopting digital and microprocessor technology, precision 3-wire or  simple 2-wire method to measuring grounding resistance, with unique line resistance verify function, anti-interference ability and environment adaptability, to ensure that long time measurement of high precision, high stability and reliability, The tester case is made of waterproof protection box, anti-collision, anti-drop, waterproof (protection grade IP65), strong and durable, and also equipped with a large-capacity rechargeable lithium battery pack, especially suitable for outdoor construction, which widely used in grounding resistance measurement of electric power, telecommunications, meteorology, oil fields, construction, lightning protection and industrial electrical equipment etc.

MEWOI4000D Digital Earth Resistance Tester with unique line resistance verify function, which can measure the low value of ground resistance in the field more accurately and avoid the error caused by the change of the line resistance in long time usage; can avoid errors caused by the test wire incomplete insertion in o instrument interface or bad contact; can avoid the error caused by changing or lengthening the test wire.

MEWOI4000D Digital Earth Resistance Tester is composed of host machine, data software, test wires, auxiliary ground rod, and communication wires and so on. It can store 400 sets of data in totally, through the monitoring software to relize historical access and online real-time monitoring functions, dynamic display, with maximum, minimum, average value indication,alarm value setting and alarm indicating function, with historical data reading, accessing, saving, reporting, printing and other functions

Measurement Range and Accuracy

Measurement FunctionRangeAccuracyResolution
Earth Resistance0.01Ω~20Ω±2%rdg±3dgt0.01Ω
0.1Ω~200Ω(Auxiliary grounding resistance 100Ω±5%, Votage to ground<10V)0.1Ω
Earth Voltage0~600V AC±2%rdg±3dgt1V


Reference Conditions And Working Conditions

Influence Constant

Base Condition

Working Conditions


Environmental Temperature




Environmental Humidity




Working Voltage

DC 7.8V±0.1V

DC 7.8V±0.6V


Auxiliary Earth Resistance Value




Interference Voltage




Interference Current




Electrode Distance of measuring R




Technical Specifications

Function Measurement of grounding resistace,voltage to ground and low value resistance
Power Supply DC 7.4V 2600mAh rechargeable lithium battery, full charge about 8.4V
Controllable white screen backlight, suitable for use in dim places
Test Method precision 3-wire or simple 2-wire measurement method
Measurement Method
Ground Resistance :rated current change-pole method, measure current 20mA Max;
Voltage to ground:Average rectification
Data Mode Average value,maximum value, minimum value
Line Resistance Verify
Avoid errors caused by the test wire incomplete insertion in o instrument interface or bad contactor replace lengthening the test wire etc. which can measure earth resistance more accuracy
Dispaly Mode 4 Digits large LCD display, white screen backlight
Measurement Indication In measurement LED flashes indication, LCD count down indication
LCD Size 128mm×75mm; Display area:124mmX67mm
Tester Dimension 280mm×260mm×160mm
Test Wire
3PCS: red 15m; yellow:10m; green 5mter
Simple Test Wire 2PCS: red 1.6m; black 1.6m
Auxiliary ground rod
2PCS: φ10mm×150mm
Measurement Time Voltage to ground: about 3 seconds/times; grounding resistance: about 15 seconds/times
Measurement Times above 5000 times (20Ω gear range measure 10Ω, measure time with 25 seconds as an interval
Line Voltage Meausrement voltage to ground: below AC 600V
Communication Interface
With USB interface, software monitoring, storage data can upload to computer ,save and print
Communication Cable USB communication cable 1PCS, 1.5m
Data Storage 400 sets, flashes display "FULL"symbol indicate that storage full
Data Hold
Data hold function: display "HOLD" symbol
Data Access Data access function: display "READ" symbol
Overfolw Indication Over range overflow function: display"OL" symbol
Alarm Indication
Measure Value exceed alarm setting value, "Toot-Toot-Toot" alarm indication
Battery Voltage
When power voltage lower than DC 7.2V±0.1V, display low power voltage symbol,and remind to replace battery
Working Current Backlight:25mA Max
Standby:25mA Max(backlight close)
Measurement:200mA Max (backlight  close)
Test Wires: 847g (include simple test wires)
Auxiliary ground rod: 468g (2pcs)
Tester Bag: 915g
Working Environment -10℃~40℃;below 80%rh
Store Environment -20℃~60℃;below 70%rh
Protection Level IP65(close the case)
Overload Protection
In meausrment of ground resistance:E-P、E-C AC 280V / 3 seconds between each terminal
Insulation Resistance above 10MΩ  (500V between circuit and outside shell)
Withstand Voltage AC 3700V/rms(Between the circuit and the shell)
Electromagnetic characteristics
IEC61010-4-3,Wireless frequency electromagnetic field≤1V/m
Suitable Safty Standard IEC61010-1、IEC1010-2-31、IEC61557-1,5、IEC60529(IP54)、Pollution 2、CAT Ⅲ 300V

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