Is there a resistance to varistors? How can they be measured? Can they be replaced by ordinary resistors?
Measure its good or bad:1., varistors can be selected as professional testing instruments2., you can use the oscilloscope first. Voltage test: when testing with an oscilloscope, set the input current to 1MADC. to test the voltage to see if the voltage is the same as that of the varistor. If the voltage is low, the varistor will be damaged. The varistor has been short circuited. If the varistor voltage is high, or there is no nonlinearity, there is no curve bar, indicating that the varistor is open. Leakage current: when the current is tested, the nominal voltage of this varistor can be checked in advance, and the oscilloscope test voltage is adjusted to the corresponding voltage range. If the current tested exceeds 100 a, the varistor will have a problem, because the leakage resistance in the factory test, leakage current will be very small control, generally not more than 30 a.. We can only do the two, and if you want to test other parameters, the oscilloscope can not be tested, and that requires more professional equipment.No. 3. can be tested with a multimeter. If you can measure the resistance, you can basically determine if there is a problem with this varistor. Don't share it.If the use of substandard, bad quality varistors, may occur varistor components explosion. Or therefore affect the use of other components.So when the varistor is broken, the varistor temporarily did not find the corresponding, can remove it, temporarily not used, as long as the voltage stability condition, a short period of time will not affect the use of your appliances. Because they are usually connected in parallel in the circuit. If the varistor is damaged, do not use ordinary resistors to replace, because there is no effect. General resistance and varistors are two distinct components that cannot be replaced.
Varistor is a kind of semiconductor device with Zinc Oxide as the main raw material. It is also a nonlinear sensitive element. Only in the role of voltage to play a sensitive role in protection. Specific principles, the two floor of the very good.
Varistors are of resistance, except that we use ordinary watt hour meters, which are unreadable and display infinity.
