Inspection content before use of megohmmeter detection
Regarding the inspection content before using a megohmmeter, it should be placed in a fixed location when not in use. For equipment with large capacitors, discharge should be carried out before measurement. When measuring, it is important to avoid twisting the two test wires of the megohmmeter together.
1. The megohmmeter should be placed in a fixed location when not in use, and the ambient temperature should not be too low or too high. Do not place the megohmmeter on damp and dirty ground, and avoid placing it in air containing harmful gases, such as acid, alkali, and other vapors. Severe and long-term vibration should be avoided as much as possible to prevent damage to the meter head and pointer from affecting the accuracy of the instrument.
2. The wires connected between the terminal and the measured object cannot be twisted, and should be connected separately to prevent poor insulation of the twisted wires from affecting the reading.
3. Equipment containing large capacitors should be discharged before measurement to ensure equipment and personal safety.
4. It is prohibited to use a megohmmeter for measurement during lightning and equipment near high voltage. Only when the equipment is not live and cannot be induced to be live by other power sources, can a megohmmeter be used for measurement.
5. When using a megohmmeter for measurement, it is necessary to firmly hold the megohmmeter to prevent it from shaking when rotating the joystick.
6. Rotate the rocker handle from slow to fast. If the pointer points to zero, do not continue to rotate with force to prevent damage to the internal coil of the megger.
7. When measuring, it is important to avoid twisting two test wires together to avoid inaccurate measurement data. Before discharging, do not touch the measuring part of the measured object or remove the wire with your hands to prevent electric shock.
8. After the measurement is completed, the tested equipment should be discharged immediately, and the rocker of the megohmmeter should not stop rotating and the tested equipment.
