Where can I measure the varistor? I am digital multimeter 200, Europe forward and reverse measurement of him (non charged), only shows 1. Does that mean he's good? Can you live test?
The method of the current source and the multimeter accuracy is very high, and because of the influence of various aspects, often is not very accurate, in addition, we must control the test time, test is completed within 5S, and the shorter the better. Can make temporary judgments, do not recommend long-term use.
Simulation with a simple device, which uses the current source (Heng Liuyuan) Regulation 1mA or 0.1mA DC current is applied to the varistor pins two, while using a multimeter test voltage at both ends, approximately considered varistor voltage.
The test is performed with a varistor DC parameter (the device gives either a 1mA or 0.1mA DC current and directly reads the voltage across the varistor, i.e., the varistor voltage).
