The high-voltage megohmmeter is suitable for measuring the resistance value of various insulating materials, transformers and motors:

1. Before measurement, keep the megohmmeter in a horizontal position, check whether the meter is normal, press the body of the meter with your left hand, shake the rocker of the megohmmeter with your right hand, the speed is about 120r/min, and the pointer should point to infinity (∞), otherwise the indicator The Eurometer is malfunctioning.

2. Before measurement, cut off the power supply of the tested electrical appliances and circuits, and perform temporary grounding and discharge of related components to ensure the safety of the person and the megohmmeter and the accuracy of the measurement results.

3. The wiring must be correct during measurement. The megohmmeter has 3 terminals (L, E, G). When measuring the resistance of the loop to ground, connect the L end to the exposed conductor of the loop, and connect the E end to the ground wire or metal shell; when measuring the insulation resistance of the loop, connect the head and tail ends of the loop to L and E respectively; measure the insulation of the cable In order to prevent the leakage current on the surface of the cable from affecting the measurement accuracy, the shielding layer of the cable should be connected to the G terminal.

4. The measurement cord from the megohmmeter terminal should be well insulated, and a proper distance should be kept between the two wires and between the wire and the ground, so as not to affect the measurement accuracy.

5. When shaking the megohmmeter, do not touch the terminal of the megohmmeter and the circuit under test with your hands to prevent electric shock.

6. After shaking the megohmmeter, the terminals cannot be short-circuited to avoid damage.

7. Electronic megohmmeters mostly use voltage doubler circuits, and the power supply current required for AA or 9V batteries is relatively large, so be sure to shut down when not in use (even if there is an automatic shutdown function, it is recommended to manually shut down after use. ) The above is just a little bit about how to use the megohmmeter.