hi , i am looking for information on what this green round thing is in the photo and what the value of this might be, this is part of a circuit board for a fluke t140 voltage tester, any help would be appreciated
At a guess it is some sort of tranzorb, metrosil or varistor type device which snips off transient voltages. After they operate beyond their lifespan they can go short which causes catastrophic failure.
If it is the first thing in the circuit after the probes (and across them) then it's almost certainly a varistor. It wouldn't be a capacitor in that case as it would conduct when measuring AC.
I see a diode bridge there...
I guess varistor.
Meter goes to 690VRMS? Nearly 1000V peak so something above that but I couldn't guess the Joule rating. It has a strange case, they are almost all smooth and blue but at a guess it is different due to space limitations. Looks thicker than usual too.
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Difficult to say as it appears to be a 3-band colour code but I bet it isn't really as it could be a precision resistor. Which is likely in a meter.
If that is purple/violet then it could be a 750R although if it were something more fancy the purple might be a tolerance band. It could be 0.15R at 0.1% if you read it the other way and omit the first band or some weirdness. It might be 1.5R... 15R... It depends on the manufacturer when you get to strange banding.
If this meter has had a large overvoltage applied I'd buy a new one . Replacing parts with random bits in something like that is never going to be the same.