Preparation For Using The Best Insulation Resistance Tester

Before using the best insulation resistance tester, thorough preparation is essential to ensure measurement accuracy and safety. Here are the detailed preparation steps:

• Visual Inspection: Check the tester’s appearance for any visible damage or wear to ensure it is intact.
• Functional Test: Turn on the best insulation resistance tester and check the needle’s response at the “0” and “∞” positions to confirm the basic functionality is intact.

• Power Disconnection: Before measurement, disconnect the device’s power supply under test. This prevents the risk of electric shock and avoids damage to the tester.
• Discharge Handling: For devices that may store charge, perform a ground short circuit discharge to eliminate residual charge and ensure safety.

• Surface Cleaning: Clean the surface of the device under test to remove dust and dirt, reducing contact resistance that can affect measurement results.
• Environmental Conditions: Measurements should be conducted in a dry, dust-free environment to minimize the impact of humidity and contamination on insulation performance.

• Position Selection: Place the best insulation resistance tester on a stable, firm surface to avoid vibrations and tilting and ensure stable readings.
• Interference Avoidance: Avoid large conductors and strong magnetic field sources to reduce external interference that can affect measurement accuracy.

• Correct Connections:

Connect the “L” terminal to the object being tested.

Connect the “E” terminal to the ground.

Use the “G” terminal if necessary to eliminate surface leakage current effects.

• Contact Check: Ensure all connections are secure and tight to prevent inaccurate readings due to poor contact.

• Charging: If using a rechargeable model, charge it for at least 6 hours in advance to ensure sufficient power for the entire testing process.
• Calibration: Regularly calibrate the best insulation resistance tester to ensure its measurement accuracy meets standard requirements.
• By following these detailed preparation steps, you can effectively enhance the accuracy of insulation resistance testing while ensuring operator and equipment safety.

Before locating a fault, you need to make the following preparations:
Understand the electrical schematic diagram and structure of the device under test, and determine the location and number of test points.
Ensure the safety of the test environment and isolate the equipment under test from other electrical equipment to avoid mutual influence.
Choose an appropriate insulation resistance tester to ensure that its voltage level, measurement range, accuracy and other indicators meet the requirements of the equipment under test.
Prepare test record sheets to record test data and results.