2/3/4Wires Earth Resistance Tester
INTRODUCTION
Click to download: MEWOI4000C New Manual
MEWOI4000C Earth Resistance Soil Resistivity Tester is specially designed and manufactured for measuring earth resistance, soil resistivity, earth voltage, AC voltage. Adopting the latest digital and micro-processing technology, precise 4-pole, 3-pole and simple 2-pole method for earth resistance measurement, importing FFT and AFC technology, with a unique function of anti-interference capability and the ability to adapt to the environment, consistency of repeat testing, 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 resistance, soil resistivity, earth voltage, AC voltage measurement.
MEWOI4000C Earth Resistance Soil Resistivity Tester is composed of host machine, monitoring software, testing wires, auxiliary ground pillars, 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 300 sets of data, fulfilling historical inquiry and online real-time monitoring through monitoring software, dynamic display, alarm indicator, and with the functions like historical data access, reading, preservation, report forms, printing and so on. |
Technical Specifications
1.Base Conditions and Working Conditions
Influence Quantity | Base Condition | Working Conditions | Remark |
Ambient Temp | 23℃±1℃ | -10℃-40℃ | ---- |
Ambient Humidity | 40%-60% | <80% | ---- |
Working Voltage | 9V±0.1V | 9V±1.5V | rC,rP |
Auxiliary Earth Resistance | <100Ω | <30kΩ | ---- |
Interference Voltage | ---- | <20V | ---- |
Interference Current | ---- | <2A | |
Electrode Distance when measuring R | a>5d | a>5d | ---- |
Electrode Distance when measuring ρ | a>20h | a>20h | ---- |
2.Intrinsic error and performance indicators under base conditions
Category | Measurement Range | Intrinsic Error | Resolution |
Earth Resistance (R) | 0.00Ω-30.00Ω | ±2%rdg±3dgt | 0.01Ω |
30.0Ω-300.0Ω | ±2%rdg±3dgt | 0.1Ω | |
300Ω-3000Ω | ±2%rdg±3dgt | 1Ω | |
3.00kΩ-30.00kΩ | ±4%rdg±3dgt | 10Ω | |
Soil Resistivity (ρ)
| 0.00Ωm-99.99Ωm | According to the precision of R (ρ=2πaR a:1 m-100m, π=3.14) | 0.01Ωm |
100.0Ωm-999.9Ωm | 0.1Ωm | ||
1000Ωm-9999Ωm | 1Ωm | ||
10.00kΩm-99.99kΩm | 10Ωm | ||
100.0kΩm-999.9kΩm | 100Ωm | ||
1000kΩm-9000kΩm | 1kΩm | ||
Earth Voltage | AC 0.0-600V | ±2%rdg±3dgt | 0.1V |
Note: 1). When rC max or rP max, additional error≤±3%rdg±5dgt.
(rC max: 4kΩ+100R<50kΩ, rPmax: 4kΩ+100R<50kΩ)
2). When 5V interference voltage, additional error≤±5%rdg±5dgt.
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 | Measurement of 2/3/4-pole earth resistance, soil resistivity, earth voltage, AC voltage |
Power Supply | DC 9V(Zi-Mn dry battery R14S 1.5V 6 PCS, continuous standby for 300 hours ) |
Measurement Range | Earth Resistance: 0.00Ω-30.00kΩ |
Soil Resistivity: 0.00Ωm-9000kΩm | |
Measuring Mode | Precise 4-pole measurement, 3-pole measurement, simple 2-pole measurement |
Measuring Method | Earth Resistance: rated current change-pole method, measurement current 20mA Max Soil Resistivity: 4-pole measurement (Wenner method) Earth Voltage: average rectification(between P(S)-ES) |
Test Frequency | 128Hz/111Hz/105Hz/94Hz(AFC) |
Short-circuit Test Current | AC 20mA max |
Open-circuit Test Current | AC 40V max |
Test Voltage Wave | Sine wave |
Electrode Distance Range | Can be set 1m-100m |
Shift | Earth resistance: 0.00Ω-30.00kΩ, automatic shift |
Soil Resistivity: 0.00Ωm-9000kΩm, automatic shift | |
Backlight | Blue screen backlight, suitable for dim places |
Display Mode | 4-digital super-large LCD display, blue screen backlight |
Measuring Indicator | During measurement, LED flash indicator, LCD count down display, progress bar indicator |
LCD Frame Dimension | 128mm×75mm |
LCD Window Dimension | 124mm×67mm |
Dimension | L×W×H: 215mm×190mm×95mm |
Standard Test Wire | 4 wires: each for red 20m, black 20m, yellow 10m, and green 10m |
Simple Test Wire | 2 wires: each for red 1.6m and black 1.6m |
Auxiliary Earthing Rod | 4 wires: Φ10mm×150mm |
Measuring Rate | Voltage to ground: about 3 times/second |
Earth resistance, soil resistivity: about 5 seconds/time | |
Measuring Times | Over 5000 times (Short-circuit test, interval time should be at least 30 seconds) |
Circuit Voltage | 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 | 300 sets, “MEM” icon storage indicator, 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 |
Interference Test | Recognize interference signal automatically, “NOISE” icon display when interference voltage exceed 5V |
Auxiliary Earthing Test | Can measure auxiliary earth resistance, 0.00KΩ-30kΩ(100R+rC<50kΩ, 100R+rP<50kΩ) |
Alarm Function | When measuring value exceeds alarm setting value, there is “Toot-toot-toot” alarm hint |
Battery Voltage | When battery voltage decreases to about 7.5V, battery voltage low icon will display, reminding to replace battery. |
Power Consumption | Standby: about 20mA (Backlight shut off) |
Boot and with backlight: about 45mA (25mA without backlight) | |
Measurement: about 100mA (Backlight shut off) | |
Weight | Total weight: 4.5kg (including package),Tester: 1443g (including battery),Auxiliary earthing rods: 935g (4pcs) |
| Tester | 1 PC |
| Tester Bag | 1 PC |
| Auxiliary Earthing Rod | 4 PCS |
| Standard testing Wire | 4 wires: each for red 20m, black 20m, yellow 10m, and green 10m |
| Simple testing Wire | 2 wires: each for red 1.6m and black 1.6m |
| Zinc-manganese Dry Battery | 6 PCS (R14S 1.5V) |
| Monitoring Software Disk | 1 Copy |
| RS232 Communication Cable | 1 PC |
| Manual/Warranty Card/Qualification Certificate | 1 Copy |
