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Diode drop measuring with a multimeter.

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Teja.p

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Diode drop measuring with multi meter .

Hi,
i am using power diodes 300 A/600V.
while i am checking the diodes with DMM(RISH MAX) in diode mode ...some diodes showing the 0.256V (anode to cathode)in DMM..but very fewer diodes showing 0.126V(anode to cathode)....
how to decide this voltage drop in DMM.
but i found faulty diodes form 0.126V group after I.R and HV Test and initial power on the power supply they showing short.
 

Re: Diode drop measuring with multi meter .

Hi,

To decide whether they are good or not you need to refer to the datasheet.
There you find the measurement method and the specified limits.

Be careful with HV test. You can easily destroy the diodes.
You never shoulkd apply higher voltage to the diodes than specified. Else you risk the internal isolation barrier to brake down.
There is no need for an immediate failure .. it may cause a long time failure.

Klaus
 

Re: Diode drop measuring with multi meter .

For diodes rated at 300A you really need more than a DMM to measure forward voltage drop.
I would suggest passing at least 2A through them and using the DMM across anode to cathode to measure Vf. Using the current provided by the DMM alone won't give you any useful reading, especially for comparing one diode with another.

Brian.
 

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