2/3 Wires Earth Resistance Tester
INTRODUCTION
Click to download: MEWOI4000 Manual
Click to download: MEWOI4000 Color Page
Click to download: Selection Map
MEWOI4000 Digital Earth Resistance Tester is specially designed and manufactured for field measurement, adopting the latest digital and micro-processing technology, 3-pole or 2-pole method for earth resistance measurement, with a unique function of wire resistance verification, anti-interference capability and the ability to adapt to the environment, to ensure high precision, high stability and reliability for prolonged measure, which is widely used in electric power, telecommunications, meteorology, oil field, construction, lightning protection, industrial electrical equipment and other earth ground resistance measurement. MEWOI4000 Digital Earth Resistance Tester has a unique function of wire resistance verification,more accurate on measuring on-site low value earth ground resistance, which can avoid error caused by resistance change due to prolonged usage of testing wire; avoid error caused by testing wire that is failed to be fully inserted in o tester interface or by poor contact; avoid error caused by users’ replacing or lengthening testing wires. MEWOI4000 Digital Earth Resistance Tester is composed of host machine, monitoring software, testing wires, communication wires and others. The large LCD display of host machine is with blue backlight and bar graph indicating that can be seen clearly. At the same time it can store 400 sets of data, fulfilling historical inquiry and online real-time monitoring through monitoring software, dynamic display, with the maximum, minimum, and mean indicators, with alarm settings and alarm indicator, and with the functions like historical data access, reading, preservation, report forms, printing and so on. |
MEASURING RANGE AND ACCURACY
Measuring Functions | Measuring Range | Accuracy | Resolution |
Earth Ground Resistance | 0.01Ω~20Ω | ±1%rdg±3dgt (Auxiliary earth ground resistance 100Ω±5%,voltage to ground<10V) | 0.01Ω |
0.1Ω~200Ω | 0.1Ω | ||
1Ω~2000Ω | 1Ω | ||
Earth Ground Voltage | 0~600V AC | ±1%rdg±3dgt | 1V |
(Remark: 23℃±5℃,below 75%rh)
SELECTION GUIDE
| Model | Range | Resolution | clamp size | RS232 | Data Storge | Audible and visible alarm | Other |
MEWOI3000B+ | 0.01Ω-200Ω | 0.01Ω | 65mm×32mm | optional | 99sets | √ | |
MEWOI3100B+ | ø32mm | ||||||
| MEWOI3000+ | 0.01Ω-1200Ω | 0.01Ω | 65mm×32mm | optional | 99sets | √ | |
| MEWOI3100+ | ø32mm | ||||||
| MEWOI3000D+ | 0.01Ω-1200Ω 0.00-20.00A | 0.01Ω,0.05mA | 65mm×32mm | optional | 99sets | √ | |
| MEWOI3100D+ | ø32mm | ||||||
MEWOI3800C | 0.01Ω-200Ω | 0.01Ω | 60mm*30mm | Appoint with RS485 communication interface, provide standard MODBUS-RTU communication protocol | × | ||
MEWOI3800D | 0.01Ω-200Ω | 0.01Ω | 60mm*30mm | × | LCD display,warning function. | ||
MEWOI4000 | 0.01Ω～2000Ω; 0～600V | 0.01Ω,1V | √ | 400sets | 2/3-wires measurement of earth resistance/voltage | ||
MEWOI4000C | earth resistance:0.01Ω～30.00KΩ; soil resistivity:0.01Ωm～9000KΩm; 0～600V | 0.01Ω,0.01Ωm,1V | √ | 300sets | 2/3/4-wires measurement of earth resistance,soil resistivity,and earth voltage | ||
MEWOI4200 | earth resistance:0.01Ω～30.00KΩ;AC Leakage current: 0.00mA~600A; soil resistivity:0.01Ωm～9000KΩm;Earth Voltage:0.0~100.0V,dual clamp: 0.01Ω-100Ω | 0.01Ω,0.01Ωm,0.01A,0.1V | ø68mm | √ | 2000sets | 2/3/4-wires,selection & dual clamp method to measure the earth resistance,soil resistivity,earth voltage,AC voltage,AC leakage current,warning function. |
TECHNICAL SPECIFICATION
Function | Earth ground resistance measurement, voltage to ground measurement, low value resistance measurement |
Power Supply | DC 9V(Zi-Mn dry battery R14S 1.5V 6 PCS, continuous standby for 300 hours ) |
Backlight | Controllable blue backlight, suitable for use in dark place. |
Measuring Mode | Precise 3-pole measurement, simple 2-pole measurement |
Measuring Method | Earth ground resistance: rated current change-pole method, measurement current 3mA Max,820Hz; Voltage to ground: average value rectification |
Data Mode | Average value, maximum, minimum |
Wire Resistance Verification | Avoid error caused by testing wire that is failed to be fully inserted in o tester interface or by poor contact or by users’ replacing or lengthening testing wires, making it more accurate for earth ground resistance measurement. |
Display Mode | 4-digital super-large LCD display, blue screen backlight |
Measuring indicator | During measurement, LED flash indicator, LCD count down display |
LCD Dimension | 128mm×75mm;Display field:124mm×67mm |
Dimension | L×W×H: 215mm×190mm×95mm |
Testing Wires | Three wires: each for Red 20m, Yellow 10m, and Green 5m |
Simple Testing Wire | 2 wires: each for Red 1.6m and Green 1.6m |
Auxiliary grounding rod | 2 PCS:Φ10mm×150mm |
Measuring Rate | Voltage to ground: about 3 times/second; earth ground resistance: about 5 seconds/time |
Measuring Times | Over 5000 times (Measuring 10Ω for one time on 20Ω range and take a pause for 25s) |
Circuit Voltage | Measuring voltage to ground: measuring below AC 600V |
RS232 Interface | Possess RS232 interface, software supervision, storage data can be uploaded to computer, saved or printed. |
Communication Wire | One piece of RS232 communication wire, with length 1.5m |
Data Storage | 400 sets, flash display “FULL” icon to indicate storage is full |
Data Hold | Data hold function: “HOLD” icon display |
Data Read | Data read function: “READ” icon display |
Overflow Display | Exceeding measuring range overflow function: “OL” icon display |
Alarm Function | When measuring value exceeds alarm setting value, there is “Toot-toot-toot” alarm hint |
Battery Voltage | When battery voltage decreases to about 7.8V, battery voltage low icon will display, reminding to replace battery. |
Power Consumption | Backlight:25mA Max |
Standby: 25mA Max(Backlight shut off) | |
Measurement:70mA Max(Backlight shut off) | |
Weight | Tester:1443g(including battery) |
WorkingTemperature & Humidity | -10℃~40℃;below 80%rh |
Storage temperature & humidity | -20℃~60℃;below 70%rh |
Overload Protection | Measuring earth ground resistance: between each interfaces of E-P,E-C, AC 280V/3 seconds |
Insulation Resistance | Over 10MΩ(between circuit and enclosure it is 500V) |
Withstanding Voltage | AC 3700V/rms (Between circuit and enclosure) |
Electromagnetic Features | Wireless frequency electromagnetic field |
Protection Type | IEC61010-1,IEC1010-2-31,IEC61557-1,5,IEC60529(IP54),Pollution etc. 2,CAT Ⅲ 300V |
Accessories | Tester:1 pc; Ground rod:2 pcs; Testing wire: 3 pcs ;Simple testing wire: 2 pcs; RS232 line:1 pc; Software disk: 1 pc; Tester bag:1 pc |
Tester:1 pc; Ground rod:2 pcs; Testing wire: 3 pcs ;Simple testing wire: 2 pcs; RS232 line:1 pc; Software disk: 1 pc; Tester bag:1 pc
