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To test a MOV, apply a high voltage with a current limiting resistor in series (1M ohm?). The MOV should conduct and you them measure the voltage across it. Checking the actual voltage with the spec. voltage should indicate as to its possible use.
Frank
most mains MOVs break over at around 390V, because thats just above the peak of 265VAC mains.
you may be wondering where to get that kind of high voltage.......but you can get it from a voltage doubler rectifier on the mains...........it will be too high so just use a pot divider to get your required voltage.
To test a MOV, apply a high voltage with a current limiting resistor in series (1M ohm?). The MOV should conduct and you them measure the voltage across it. Checking the actual voltage with the spec. voltage should indicate as to its possible use.
Frank
most mains MOVs break over at around 390V, because thats just above the peak of 265VAC mains.
you may be wondering where to get that kind of high voltage.......but you can get it from a voltage doubler rectifier on the mains...........it will be too high so just use a pot divider to get your required voltage.
Connect MOV and resistor in series
Select resistor so that dissipated power do not exceed Rated Wattage value given in MOV´s datasheet
varistor DC current is normally 1.0mA or lower. (check datasheet)
Connect voltage higher than MOV´s Clamping Voltage to R and MOV series circuit.
Measure voltage across MOV
Connect MOV and resistor in series
Select resistor so that dissipated power do not exceed Rated Wattage value given in MOV´s datasheet
varistor DC current is normally 1.0mA or lower. (check datasheet)
Connect voltage higher than MOV´s Clamping Voltage to R and MOV series circuit.
Measure voltage across MOV
Kindly, tell which one is Vclamp , which one is Imov , Which one is Imaxdc, which one is Pmov & which one is Pmov max ... ? for this part no. having the following characteristics ?
Kindly, tell which one is Vclamp , which one is Imov , Which one is Imaxdc, which one is Pmov & which one is Pmov max ... ? for this part no. having the following characteristics ?
I don't know what is youa application but in most cases MOVs can be replaced with TVS (transient voltage suppressor, also called Transil). The advantage on the side of transils is that they degrade much slower from triggering conditions than MOVs do.
Measure the voltage with voltmeter ? If supply ac supply then measure AC volts & if supply dc supply (to the same part) then measure dc volts , Is it correct ?
And the measured voltage should be equal to the calculated voltage, is it correct ?
what should be value of the RL in the example which you taken in above post ? and should i use lamp or use any type resistor & of what wattage ?
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