The insulation resistance multimeter is an advanced intelligent precision instrument. Unless you are an authorized professional maintenance personnel and have the relevant calibration performance testing methods and maintenance information, do not attempt to repair this type of instrument.

Insulation resistance multimeters generally use automatic calibration technology. Except for indicating the parts that can be replaced, components should not be replaced at will to avoid deviations in technical indicators.

1. General maintenance

1) Clean the instrument housing regularly with a damp cloth and neutral detergent. Do not use abrasives or solvents. Dirt on the terminals and the test lead terminals will affect the readings. Clean the dirt on each terminal with a detergent.

2) When not in use, press the POWER button to turn off the power. Remove the battery for long-term use.

3) The instrument should be stored away from moisture, high temperature and strong magnetic field.

2. Replace the battery

1) Press the POWER button to turn off the power supply and remove the test leads or test wires from the terminals to completely disconnect the test wires from the circuit under test.

2) Remove the two screws of the battery cover and take off the battery cover.

3) Remove the battery from the battery box.

4) Replace the batteries with 6 new AA (AM3/LR6) batteries (standard capacity about 2450mAh).

5) Close the battery cover and install the two screws.

3. Replace the fuse

To avoid personal injury or instrument damage caused by electric shock or arc burns, the fuse must be replaced according to the following steps and can only be replaced with a fuse of the same model or the same electrical specification.

1) Press the POWER button to turn off the power supply and remove the test leads or test wires from the terminals to completely disconnect the test wires from the circuit under test.

2) Remove the two screws on the battery cover, the two screws on the back cover of the housing, and the one screw behind the battery, and remove the battery cover and the back cover of the housing.

3) Gently pry up one end of the fuse, remove the burnt fuse, and replace it with a fuse of the same model or electrical specification. Make sure that the fuse is securely clamped in the middle of the fuse clamp. Fuse specification: F1A240V.

4) Close the battery cover and the rear cover of the housing and tighten the four screws. Do not use the instrument before tightening.

5) Fuses rarely need to be replaced; a blown fuse is almost always the result of operator error.