Common faults and repairs

1. Pointer cannot return to zero or infinity

   • reasonChanges in circuit resistance, short circuits or open circuits in coils, deformation of guide wires, etc.
   • solution：
     • Check and adjust the resistance of the current circuit or voltage circuit.
     • Replace the variable coil or guide wire.
     • For situations where the voltage is insufficient, check whether the generator winding is open or short circuited, and replace or rewire it if necessary.

2. Pointer rotation is stuck

   • reasonWear of shaft tip, tight fit of bearings, deformation of coils, etc.
   • solution：
     • Replace worn shaft tips or adjust the clearance between bearings and shaft tips.
     • Rewrite the deformed coil.
     • Clean the iron filings and other impurities on the coil or iron core.

3. Large reading error

   • reasonPoor mechanical balance, residual torque changes in the guide wire, and the need to adjust the scale characteristics.
   • solution：
     • Adjust the mechanical balance again by tilting the instrument to adjust the balance hammer.
     • Re weld the guide wire and stretch or shorten it to change the scale characteristics.
     • If the above methods are ineffective, consider redrawing the scale line.

Daily maintenance and upkeep

1. regular cleaning

   • Clean the surface with a dry and soft cloth to prevent dust accumulation from affecting the measurement.
   • Do not use cleaning agents containing corrosive or soluble chemicals to avoid damaging the instrument casing and screen.

2. Moisture-proof and dust-proof

   • Insulation resistance meters are sensitive to humidity and dust, and should be stored in a dry and clean environment after use.
   • It is recommended to place it in a moisture-proof box or use a dust cover for protection.

3. Proper storage

   • When not in use for a long time, the power should be turned off, the test line should be removed, and stored in a dedicated instrument box.
   • Avoid contact with strong magnetic fields, strong vibrations, or high temperature environments to prevent affecting the stability of internal components.

4. Check the testing line

   • Regularly inspect the insulation of the test line for aging or damage, and replace it promptly if any problems are found.
   • Keep the test terminals clean and wipe them if necessary to prevent poor contact.

5. Calibration and Inspection

   • According to the frequency of use, regularly send it to a professional organization for calibration to ensure that the measurement accuracy meets the standards.
   • Regularly check whether the various functions of the instrument are normal, and repair them in a timely manner if any problems are found.

6. battery maintenance

   • If the instrument is powered by batteries, attention should be paid to checking the battery level. When the battery is low, replace or charge it in a timely manner to avoid battery leakage and damage to the internal circuit.
   • When not in use for a long time, it is recommended to remove the battery to prevent damage to the instrument caused by battery leakage.

7. Prevent overload use

   • Strictly follow the rated voltage range and load range of the instrument during use to avoid damaging the internal circuit due to overload or incorrect operation.

8. Pay attention to operating standards

   • Avoid directly measuring high-voltage live equipment, use insulated tools if necessary, and follow safety operating procedures.
   • After testing, ensure that the discharge is completed before removing the test line to prevent residual voltage from causing harm to the instrument and operators.