How it works: The DC resistance tester has a constant current source that generates DC current. When measuring the resistance, the constant current feeds the tested product into the constant current from the I+ and I-ends. The current generates the corresponding voltage value on the tested product. The voltage value is retrieved at the V+ and V-ends.

Matters needing attention

1. When measuring the no-load voltage regulating transformer, it is necessary to exit the discharge before switching the tap switch, and the tap switch can be switched after the discharge indication is over

2. Disconnection of wiring is not allowed during measurement.

3. If the charging progress bar and current display value remain stagnant for a long time, the measured winding resistance may exceed the current measurement range, and the current cannot reach the preset value. At this point, you can press the "exit" key to return, select the current and try again.