1. Place the meter in the horizontal position and check if the pointer of the galvanometer is on the center line. Otherwise, apply the zero adjuster to adjust it to the center line.
2. Set the “magnification scale†to the maximum multiple, slowly turn the generator's handle, and turn the “measurement dial†to point the pointer of the galvanometer to the center line.
3. When the pointer of the galvanometer is close to balance, speed up the speed of the generator handle to 120 rpm or more, and adjust the “measurement dial†so that the pointer points to the center line.
4. If the “measurement dial†reading is less than 1, the magnification should be placed in a smaller multiple and the “measurement dial†should be re-adjusted to get the correct reading.
5. When filling out this record, the plan of the resistance test point should be attached and the test points should be numbered sequentially.
Grounding resistance tester Note 1. The grounding line should be disconnected from the protected equipment to ensure the accuracy of the measurement results.
2. There should be no stray current and polarized soil near the measured pole.
3. It cannot be measured after the rain and when the soil absorbs too much water, and when the climate, temperature, pressure, etc. change drastically.
4. The probe should be away from large metal bodies such as underground water pipes, cables, railways, etc., where the current pole should be far away from 10m or more, and the voltage pole should be far away from 50m. If the metal body is not connected to the grounding grid, the distance can be shortened by 1/2. ~1/3.
5, the connection line should use a well insulated wire to avoid leakage.
6. Pay attention to the position where the current pole is inserted into the soil, so that the ground rod should be at zero potential.
7. The test should be carried out when the soil resistivity is large, such as in the early winter or summer dry season.
8, the test site can not have electrolytic substances and decaying bodies, so as not to cause illusions.
9. When the galvanometer sensitivity is too high, the potential probe voltage pole can be inserted into the soil shallower. When the galvanometer sensitivity is insufficient, it can be wetted by water injection along the probe.
10, check the accuracy of the instrument at any time
Capacitive Touch Membrane Switch
A Capacitive Membrane Touch Switch is type of switch, which operates only when the user makes contact with the object. The Capacitive membrane switch uses sensing technology to operate the functions of switch when touched.
Capacitance switches use the humans body`s capacitance to identify touch and open/close the circuit. It requires only one electrode to operate, which is found behind a panel made of non-conductive material like glass, plastic or acrylic.
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