Principle and use of insulation multimeter
An insulated multimeter is a functional instrument used by technicians to verify the quality of electrical equipment, ensure compliance with regulations and standards, determine changes in equipment performance over time, and identify the cause of faults by conducting insulation resistance tests on conductors, electrical components, circuits, and devices.
1, The Importance of Insulation Resistance Measurement
Maintenance technicians use insulation resistance testing to minimize the probability of equipment failure or malfunction and maximize production efficiency. At the same time, it can also prevent the occurrence of dangerous accidents such as electric shock and fire, ensuring the personal safety of employees.
2, Insulation resistance measurement process
Before using an insulated multimeter for testing, technicians must first perform basic voltage, current, and resistance measurements.
After the equipment is powered off, use a FLUCK insulated multimeter to determine the integrity of the windings or cables in the motor, transformer, and switchgear. Measure the insulation resistance and leakage current of insulation materials to generate an insulation resistance value.
Safe operation
(1) Before testing
1. Work on non electrified circuits as much as possible and use appropriate locking/marking procedures
2. Assuming the tested circuit is live, use appropriate personal protective equipment and safety tools.
3. Remove all jewelry and stand on a rubber insulated school.
(2) During testing
1. Do not connect insulated public meters to live conductors or live equipment, and strictly follow the manufacturer's recommendations.
2. Close the tested equipment through open circuit fuses, switches, or circuit breakers. Lock and mark the device under test.
3. Disconnect the branch wires, grounding wires, and all other equipment from the tested unit.
Before and after the test, discharge the capacitance of the conductor separately.
3, Precautions
1. Check all leakage currents through fuses, switch devices, and circuit breakers in the excitation circuit. Leakage current can cause inconsistent and incorrect readings.
2. Do not use the insulation resistance tester in hazardous or explosive gas environments as the instrument may generate arcs when the insulation is damaged.
3. Do not use an insulation resistance tester on electronic devices.
4. Please use insulated rubber gloves with leather protection when connecting the test line.
