Electrician commonly used instrument usage method: grounding resistance measuring instrument
Grounding resistance refers to the earthing body resistance buried in the ground and the soil stray resistance.
Instructions:
1. Disconnect the connection point between the grounding trunk and the grounding body, or disconnect the connecting points of all grounding branches on the grounding trunk.
2. Insert the two grounding rods into the ground 400mm deep, one far from the grounding body 40m, and the other 20m away from the grounding body.
3. Place the shaker in a flat place near the grounding body and wire it.
(1) Connect the terminal block E on the watch and the grounding body E' of the grounding device with a connecting wire.
(2) Connect the terminal block C on the watch to the grounding rod C' which is 40m away from the grounding body with a connecting wire.
(3) Connect the terminal block P on the watch and the ground bar P' 20m away from the grounding body with a connecting wire.
4. Adjust the coarse adjustment knob according to the grounding resistance requirement of the grounding body to be tested (there are three adjustable ranges on the top).
5. Shake the watch evenly at a speed of about 120 rpm. When the hands are deflected, the fine adjustment dial is adjusted until the hands are centered. After adjusting the reading of the fine dial, multiply by the coarse adjustment multiple, which is the grounding resistance of the grounded body to be tested. For example, if the fine-tuning reading is 0.6 and the coarse tuning resistance is 10, the measured grounding resistance is 6Ω.
6. In order to ensure the reliability of the measured grounding resistance value, the orientation should be changed and the retesting should be performed. Take the average of several measured values ​​as the grounding resistance of the grounding body.
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