Insulation Testers  |    Detailed introduction of technical principles

The core principle of an insulation resistance tester is to apply a constant DC voltage to the insulation of the object under test, measure the resulting microampere-level leakage current, and calculate and directly display the insulation resistance value based on Ohm's law (R=U/I).

During the test, an internal DC high-voltage generator produces a test voltage of 250V to several kilovolts (e.g., 500V, 1000V, 2500V, 5000V, etc.) between the conductor and ground (or casing) of the electrical equipment. Under the action of the DC voltage, the insulating medium will generate an absorption current that decays over time and a stable conduction current (i.e., leakage current). The instrument measures this stable leakage current through a precision circuit and directly calculates the insulation resistance (usually in MΩ or GΩ).

This test is non-destructive and is mainly used to detect whether the insulation is generally damp, dirty, or has penetrating defects. By comparing the absorption ratio (DAR) or polarization index (PI) (the ratio of resistance values at different time points), it can also effectively determine the aging or delamination and moisture absorption state of the insulation. It is the most basic and conventional method for detecting the insulation condition of electrical equipment. Insulation tester, megohmmeter and insulation resistance tester, digital insulation resistance tester 250V-5000V, maximum 5TΩ.
Insulation resistance tester, high voltage insulation resistance tester, with 5 ranges: 500V, 1000V, 2500V, 5000V, 10000V, testing up to 10TΩ.

Designed strictly according to safety standards.

1. Insulation resistance range 10TΩ@10kV, short-circuit current adjustable, maximum up to 10mA.

2. Automatically displays polarization index (PI) and induced absorption ratio (DAR) test values, can test leakage current and capacitance.

3. Excellent anti-interference performance; the instrument maintains test accuracy even when interference current reaches 2mA.

4. Rapid discharge of capacitive samples; no manual discharge is required during cable testing; the instrument automatically and rapidly discharges.

5. Two power supply options: Lithium-ion battery powered, providing up to 4 hours of battery life (10000V@100M test resistor). 6. Can be charged while in use. Automatically switches from AC power to battery power during power outages.

1. AC Power: 220V±10% 50-60Hz 20VA

2. Battery Power: 16.8V lithium-ion rechargeable battery

3. Battery Life: 10000V@100M Approximately 4 hours

4. Test Voltage Accuracy: 100% to 110% of nominal value

5. Current Measurement Range: 10mA

6. Current Measurement Accuracy: 5%+0.2nA

7. Short Circuit Current: 2 to 10mA, Adjustable Output

8. Capacitance Measurement Range: 20uF

9. Capacitance Measurement Accuracy: 15%+0.03uF

10. Capacitor Discharge Rate: From 10000V to 10V 0.5S µF

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