Measure the grounding resistance of the grounding network in the weak current machine room. Step 2.1: All wiring at the instrument end should be correct and correct. 2.2 Instrument wiring and grounding electrode E ˊ、 Potential probe P ˊ And current probe C ˊ It should be firmly in contact. 2.3 After the instrument is placed horizontally, adjust the mechanical zero position of the galvanometer to zero. 2.4. Set the "magnification switch" to the maximum magnification and gradually increase the crank speed to reach 150r/min. When the galvanometer pointer deflects in a certain direction, rotate the dial to restore the galvanometer pointer to the "0" point. At this point, multiplying the reading on the dial by the multiplier gear is the measured resistance value. 2.5. If the reading on the dial is less than 1 and the galvanometer pointer is still not in balance, the magnification switch can be set to a lower magnification until it is fully balanced. 2.6. If the galvanometer pointer of the instrument is found to shake, the rotational speed of the crank can be changed to eliminate the shaking phenomenon
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