MEWOI4000D-High Performance Digital Earth resistance tester

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 into 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 into 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