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Summary of Contents for MEWOI MEWOI3000+
- Page 1 Earth Resistance Tester Field Application Guide MEWOI3000+,MEWOI3100+,MEWOI3000B+ MEWOI3100B+,MEWOI3000D+,MEWOI3100D+ www.mewoi.com - ０ -...
- Page 2 MEWOI3000+Clamp Earth Tester Field Application Guide Structure of Meter 1）. Long Pincers Jaw: 65×32mm 2）. HOLD Key: lock / Release display / Storage 3）. Trigger: to control opening and closing of jaw 4）. ON/OFF Button: Boot Up / Shutdown /*Quit /Clear Data 5）.
- Page 3 Principle of Resistance Measurement The basic principle of MEWOI Clamp earth tester in the measurement of resistance is to measure the loop resistance, as shown in the figure below. The jaw part of the Meter is comprised of voltage coil and current coil. The voltage coil provides excitation signal, and will induce a potential E on the measured loop.
- Page 4 If there is no normal boot self-calibration, instrument will show "Er" symbol, said boot error. need to check the cause and reboot (Figure 3). Correct boot, the meter shows "OLΩ", and the user can test it with a random test ring as shown on the right.
- Page 5 2） Application of Single-Point Grounding System According to the measuring principle, MEWOI series Meter can only measure the loop resistance, and the single-point grounding cannot be measured. However, users will be able to use a testing line very near to the earth electrode of the grounding system to artificially create a loop for testing. The following presented two kinds of methods for the single-point grounding measurement by the Meter.
- Page 6 value by connecting the test lines with both ends. So, if the measurement value of the Meter is smaller than the allowable value of the grounding resistance, then the two grounding bodies are qualified for grounding resistance. （ ） ．Three-Point Method As shown in the figure below, in the vicinity of the measured grounding body R find two independent grounding bodies of better grounding state R...
- Page 7 The computer room of a telecommunications system is often located on the upper floor of a building and is very difficult to measure with a megger. It is very convenient to test with a MEWOI Earth Clamp Meter. Connect the fire hydrant and the ground electrode (the fire hydrant is installed in the engine room)by a wire, and then clamp the wire to measure the earth resistance.
- Page 8 If the meter is less than the allowable value of the ground resistance, then the grounding resistance of the engine room and the transmitting tower is qualified. If the meter measurement is greater than the allowable value, please measure it by single point grounding Application of building grounding system If the ground electrodes of each building are independent, see the following ground resistance measurements for each ground electrode。...
- Page 9 As shown above, in the gas station grounding system, the tank grounding electrode A is connected with the tanker, and the loading and unloading point grounding electrode C is an independent grounding electrode. Find another independent grounding electrode as the auxiliary grounding electrode, B (such as fire hydrant, etc.), according to the three point method, R1, R2 and R3 are measured with by the tester separately.
- Page 10 （3） Measurement of connection resistance of oil hose for tanker: Connect the refueling gun and the tanker by test wire. Check the readings of the tester RT. It can be calculated: The connecting resistance of the oiler hose is: R=RT-RL Among: RT is the resistance measured by the tester。RL is the resistance of the test wire.
- Page 11 12. The difference of earth clamp meter and digital ground resistance tester Currently in the market there are two kinds of most widely used testers: clamp earth resistance tester and digital ground resistance tester. The measuring principle of the two instruments is different, and the requirements of testing are different.
- Page 12 esting pecialist - １１ -...
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