How to determine the quality of a ballast in a multimeter?
If it's an electromagnetic type, take a multimeter resistor, from big to small, if you have resistance, and it's stable, usually good. If it's electronic, the overall test not to come out, have to open it charged components one by one, you do not have this condition don't test, otherwise there is the possibility of high voltage electric shock.
If the electronic ballast, it is more troublesome, its circuit is more complex, suggested connected to tubes electricity try first, is not normal, if not normal, are subject to damage detection of several components: 1. The test for a breakdown resonant capacitor. The failure rate of this component is very high! Observe whether or not the filter has a drum, liquid, and whether the meter is leaking (discharge first, disconnecting one foot), and the insurance is normal. There is no fault in measuring the rectifier diode. Measure whether two triode transistors are normal (need to be removed and measured)
If it is inductive ballast, only two wires, the multimeter modulation resistance measuring the resistance of the two wires, should be 1 k, and stability, is basically good. Detailed tests can test the inductance, but the average multimeter does not test the function of the inductance.
