Changes in the measured value of the insulation tester

QThe measured value of the insulation tester changes. What is the cause? (Insulation Tester IR4057-50)

A

Insulators generally have the following properties:

- Resistance value changes with temperature. (The higher the temperature, the lower the resistance)
- Resistance varies with the voltage being measured. (The higher the voltage applied, the lower the resistance)
- Resistance decreases with moisture absorption. (Resistance drops significantly in high humidity)
- For insulators with a capacitive component (capacitor), the resistance increases while the capacitor is being charged.

Insulation Testers, Megohmmeters
https://www.hioki.com/global/products/insulation-testers

Insulation Tester IR4057-50,IR4056,IR4053,IR4018,IR4017,IR4016,3490

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