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INTRODUCTION
MEWOI3000D Clamp Earth Resistance Tester is a major breakthrough in traditional grounding resistance measurement. It is widely used in the grounding resistance measurement of the power, telecommunications, meteorology, oilfield, construction and the industrial and electrical equipment. MEWOI3000D Clamp Grounding Resistance Tester, in the measurement of a grounding system with loop, does not require breaking down the grounding down lead, and no need the auxiliary electrode. It is safe, fast and simple in use. MEWOI3000D clamp grounding resistance meter can measure ground faults which cannot be measured by traditional methods. It can be used in applications where traditional methods cannot be measured, because the MEWOI series clamp grounding resistance meter measures the combined value of grounding body resistance and grounding lead resistance. . In addition, the C type Clamp Grounding Resistance Tester is also able to measure the leakage current and the neutral current in the grounding system. |
MEWOI3000D Accessories
Earth tester
Test ring
Manual
Warranty card/Qualification card
Aluminum Case
TECHNICAL SPECIFICATION
Measurement Range & Accuracy
| Measurement | Range | Resolution | Accuracy |
| Resistance | 0.010Ω-0.099Ω | 0.001Ω | ±(1%rdg+0.01Ω) |
0.10Ω-0.99Ω | 0.01Ω | ±(1%rdg+0.01Ω) | |
1.0Ω-49.9Ω | 0.1Ω | ±(1%rdg+0.1Ω) | |
50.0Ω-99.5Ω | 0.5Ω | ±(1.5%rdg+0.5Ω) | |
100Ω-199Ω | 1Ω | ±(2%rdg+1Ω) | |
200Ω-395Ω | 5Ω | ±(5%rdg+5Ω) | |
400-590Ω | 10Ω | ±(10%rdg+10Ω) | |
600Ω-1000Ω | 20Ω | ±(20%rdg+20Ω) |
Technical Parameter
| Function | Description |
| Resistance Range | 0.010Ω~1000Ω |
| Current Range | 0.00mA~30.0A |
| Resistance Resolution | 0.001Ω |
| Current Resolution | 0.05mA |
| Data Storage | 99 sets |
| Alarm Symbol Indication | PressALkey to turn on / off |
| Alarm Threshold Setting Range | Resistance：1~199Ω; Current: 1-499mA |
| Power Supply | 6VDC 4 PCS LR6 lkaline batteries |
| Working Temperature | -10℃-55℃；10％RH-90％RH |
| LCD Size | 4 Digits LCD display, Screen: 47mm×28.5mm |
| Clamp Size | 55mm×32mm |
| Clamp Opening Size | 32mm |
| Tester Weight | 995g |
| Tester Dimension | 275mm×85mm×56mm |
| Protection Level | Double insulation |
| Structural Feature | Clamp CT |
| Shift | Automatic shift |
| External Magnetic Field/Electrical Field | ＜40A/m;＜1V/m |
| Single Measurement Time | 1 second |
| Resistance Measurement Frequency | ＞1KHz |
| Measured Current Frequency | 50/60Hz Automatic |
APPLICATION
Measurement Principle
Measure the loop resistance
(Base on the formula: R=E/I)
Measure the grounding loop resistance system
(R1 is the measured earth resistance;
R0 is the equivalent resistance of the grounding resistor in parallel)
Measurement Method
Two earth point measurement method
The RA is the measured grounding object, connecting RA
and RB (which is the nearly grounding object like as water
pipe or building) with one wire, the tester will test and indicate the concatenation resistance value of the ground
resistance and the test line resistance.
RT=RA+RB+RL
(RT is the tested value, RL is the test line resistance value)
Three earth point measurement method
(1).Connect the RA and RB with a test line; use the Meter to
get the first reading R1;
(2).Connect the RB and RC with a test line; use the Meter to
get the first reading R3;
(3).Connect the RA and RC with a test line; use the Meter to
get the first reading R2.
In the above three steps, the reading measured in each step is the value of the two series grounding resistance.
In this way, we can easily calculate the value of each grounding resistance,According to the reading value of R1,R2,R3:
R1=RA+RB; R2=RA+RC; R3=RB+RC
Then: RA=(R1+R2-R3)/2
As the reference points, the grounding resistance values of the other two grounding bodies
RB and RC are:
RB=R1-RA; RC=R2-RA
Field Application
The application of machine room earth resistance measurement
The machine room of telecommunication system normally in the upper deck of the building. It is hard to use the meg-ohm meter to measure. However, MEWOI Clamp meters are very convenient to test.
The application of substation earth resistance measurement
MEWOI series clamp meter can use to test the situation of contact and connect of circuit. With the help of one test line, it can be used to test the connect situation of equipment in station and the grounding system. Single point grounding measurement is allowed for the measurement of grounding resistance.
The application of building lightning protection grounding system measurement
If the earth poles of the building are independent of each other, the earth resistance can be measured by clamp to testing any of the earth poles, and the earth resistance can also be measured by clamp the building roof lightning arrester.When the measured value is less than the allowable value, the earth electrode is qualified.If the measurement value of the clamp meter is larger than the allowable value, please use ingle earth point method to measurement.
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 |
