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INTRODUCTION
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 Function | Range | Accuracy | Resolution |
| Earth Resistance | 0.01Ω～20Ω | ±2%rdg±3dgt | 0.01Ω |
| 0.1Ω～200Ω | (Auxiliary grounding resistance 100Ω±5%, Votage to ground＜10V) | 0.1Ω | |
| 1Ω～2000Ω | 1Ω | ||
| Earth Voltage | 0～600V AC | ±2%rdg±3dgt | 1V |
（Note：23℃±5℃，below75%rh）
Reference Conditions And Working Conditions
Influence Constant | Base Condition | Working Conditions | Remark |
Environmental Temperature | 23℃±1℃ | -10℃-40℃ | ---- |
Environmental Humidity | 40%-60% | ＜80% | ---- |
Working Voltage | DC 7.8V±0.1V | DC 7.8V±0.6V | --- |
Auxiliary Earth Resistance Value | ＜100Ω | ＜30kΩ | rC、rP |
Interference Voltage | Non | ＜20V | ---- |
Interference Current | Non | ＜2A | ---- |
Electrode Distance of measuring R | a＞5d | a＞5d | ---- |
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 |
| Backlight | 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) | |
| Weight | Tester:2290g |
| 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 |