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INTRODUCTION
MEWOI4000 DigitalEarth Resistance Tester specially designed and manufactured for the field measurement of ground resistance, adopts digital and micro-processing technology, 3 wire or 2 wire method to measure ground resistance, with unique calibration function for wire resistance, anti-interference ability and environmental adaptability, to ensure the long-term measurement of high precision, high stability and reliability; The instrument out shell adopts waterproof protection case, anti-collision, anti-fall, waterproof (protection grade IP65),which is strong, safe and durable, the instrument is also equipped with large capacity rechargeable lithium battery pack, especially suitable for outdoor construction site to use.It is widely used in measuring ground resistance of electric power, telecommunication, meteorology, oil field, construction, lightning protection and industrial electrical equipment. MEWOI4000 DigitalEarth Resistance Tester has the unique function of wire resistance calibration, and it is more accurate to measure the low value ground resistance in the field, which can avoid the error caused by the change of wire resistance in the test line for a long time usage.It can avoid errors caused by incomplete insertion of test line into instrument interface or bad contact.It can avoid the error caused by the user to change or lengthen the test line.. MEWOI4000 Digital Grounding Resistance Tester is composed of host machine, monitoring software, test wires, communication wires etc. The large LCD display of host machine, with white backlight and bar graph indicating that can be seen clearly. At the same time it can store 400 sets of data, realize historical inquiry and online real-time monitoring by monitoring software, dynamic display, with the indicator of max/min/average value, and with alarm value setting and alarm indicator functions, and with the functions as historical data access, reading, preservation, report forms, printing and so on. |
SPECIFICATION
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: 23oC±5oC,below75%rh)
Technical Specifications
| Function | Description |
| Function | Measurement of earth resistance, voltage to earth |
| Power Supply | DC 9V Alkaline dry cell LR14 1.5VX6pcs, continues working 300 hours |
| Backlight | Controllable screen backlight, suitable for dim places |
| Measuring Mode | Precision 3-wire measurement, simple 2-wire measurement |
| Measuring Method | Earth Resistance: rated current change-pole method, measurement current 20mA Max |
| Earth Voltage: Average rectification | |
| Test Frequency | 500Hz |
| Short Circuit Test Current | AC 10mA max |
| Data Mode | Average value, maximum value, minimum value |
| Wire Resistance Verification | To avoid errors caused by incomplete insertion of test wire into instrument interface or poor contact or replacement of extended test wire by users, so as to make the grounding resistance measurement more accurate |
| Display Mode | 4-digital super-large LCD display, white screen backlight |
| Measure Indicator | LED flash indicator and LCD count down display in measurement |
| LCD Dimension | 128mm×75mm; display area:124mmX67mm |
| Meter Dimension | 215mm(L)×178mm(W)×83mm(H) |
| Test Wires | 3 wires: each for red 15m, yellow 10m, and green 5m |
| Simple Test Wire | Red 1.6m |
| Auxiliary Grounding Rod | 2PCS: Φ10mm×150mm |
| Measuring Rate | Earth Voltage: about 3 times/second; Earth resistance: about 5 seconds/time |
| Measuring Times | Over 5000 times (20Ω gear measure 10Ω, interval time should be at least 30 seconds) |
| Line Voltage | Measurement of earth voltage: below AC 600V |
| Data Storage | 400 sets, “FULL” symbol flash display storage is full |
| Data Hold | Data hold function: “HOLD” symbol display |
| Data Access | Data read function: “READ” symbol display |
| Overflow Display | Exceed measuring range overflow function: “OL” symbol display |
| Alarm Function | Measuring value exceeds alarm setting value, LCD flashes display alarm symbol |
| Battery Voltage | While battery voltage decreases to around 7.2V±0.1V, will display battery voltage low symbol“ ”, and remind to charging the battery |
| Power Consumption | Backlight: 25mA Max |
| Standby: 25mA Max(Backlight shut down ) | |
| Measurement: 200mA Max(Backlight shut off) | |
| Weight | Tester: 1.325kg |
| Test wires: 0.847kg(include the simple test wires) | |
| Auxiliary Grounding Rod:0.468kg(2pcs) | |
| Tester package: 0.915kg | |
| Working Temperature & Humidity | -10oC-40oC, below 80%rh |
| Storage temperature & humidity | -20oC-60oC, below 70%rh |
| Protection Level | IP65(close the case) |
| Overload Protection | Measure earth resistance: between each interfaces of C(H)-E, P(S)-ES, AC 280V/3 seconds |
| Insulation Resistance | Over 10MΩ(between circuit and outside shell is 500V) |
| Withstanding Voltage | AC 3700V/rms. (Between circuit and outside shell) |
| Electromagnetic Features | IEC61010-4-3,wireless frequency electromagnetic field≤1V/m |
| Protection Type | IEC61010-1 (CAT III 300V, CAT IV 150V, Pollution 2); |
| IEC61010-031; | |
| IEC61557-1 (Earth resistance); |
SELECTION GUIDE
Digital Earth Resistance Clamp Meter
Click "blue"marked model No. for detailed Specificaiton
| Model | Range | Resolution | clamp size | RS232 | Data Storge | Other |
| 0.01Ω-200Ω | 0.001Ω | 65mm×32mm | optional | 99sets | |
| ø32mm | |||||
MEWOI3000B
| 55mm×32mm | |||||
MEWOI3000
| 0.01Ω-1000Ω | 0.001Ω | 55mm×32mm | 99sets | ||
| 0.01Ω-1200Ω | 0.001Ω | 65mm×32mm | optional | 99sets | |
| ø32mm | |||||
MEWOI3000D
| 0.01Ω-1000Ω 0.00-30.00A | 0.001Ω,0.05mA | 55mm×32mm | 99sets | ||
| 0.01Ω-1200Ω 0.00-20.00A | 0.001Ω,0.05mA | 65mm×32mm | optional | 99sets | |
| ø32mm | |||||
| 0.01Ω-1500Ω 0.00-40.00A | 0.001Ω,0.05mA | 65mm×32m m | √ | 99sets | Rechargable Batteries |
| 0.01Ω-100Ω | 0.01Ω | 60mm*30mm，(Closed) | Appoint with RS485 communication interface, provide standard MODBUS-RTU communication protocol | × | |
| 0.01Ω-100Ω | 0.01Ω | 60mm*30mm （Closed）， | × | LCD display,warning function. | |
| 0.01Ω-200Ω | 0.01Ω | Split Type 56mm×26mm | Wired network: RS232,RS485 standard communication protocol Wireless network: RS232、RS485、GSM communication protocol | × | |
| 0.01Ω-200Ω | 0.01Ω | Split Type 56mm×26mm | × | LCD display,warning function. | |
| 0.01Ω~2000Ω | 0.01Ω | 2/3-wires measurement, Online | |||
| 0.01Ω~2000Ω | 0.01Ω | 2/3-wires measurement, Online,GPRS | |||
| 0.01Ω～2000Ω; 0～600V | 0.01Ω,1V | √ | 400sets | 2/3-wires measurement of earth resistance/voltage | |
| 0.01Ω～2000Ω; 0～600V | 0.01Ω,1V | √ | 400sets | 2/3-wires measurement of earth resistance/voltage | |
| 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 | |
MEWOI4200D
| 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 | |
| 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. |
| 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. |
| Ground resistance:0.10Ω ～ 200Ω(4 clamp method) Ground resistance ( R ):0.10Ω ～ 20KΩ Soil resistivity ( ρ )0kΩm～9000kΩm AC current (A～)1mA～500.0A Ground voltage (V～)0.0V～200.0V | 0.01Ω,0.01Ωm,0.01mA,0.1V | ø68mm | √ | 100sets | Untie-free tower grounding resistance tester |
