electronics

coathanger57

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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
 

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Can you take some more pictures?

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.
 
hi, here are more photo's. thanks
 

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This is what is was but I'm having difficulty locating it on the Epcos site:

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I could recognise the Epcos logo from one of the new pictures. If it's what I think it is then it will most likely work without it albeit not as safely :).

Maybe it is something other than a varistor, like @chookey said, it does look thermistor-ish. Without seeing a schematic it's not easy.
 
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hi, unsoldered it for better view and found writing on it.
 

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FLUKE multimeter disassemble accessories, component number: RT1 RT2 component model: R112.
TB2FPUup9XlpuFjy0FeXXcJbFXa_!!100897170.jpg

TB2v6E6p9xjpuFjSszeXXaeMVXa_!!100897170.jpg


Professional maintenance FLUKE multimeter , sales of various multimeter accessories, multimeter calibration service, calibration source for FLUKE5520A, can calibrate FLUKE multimeter , and other brands of digital multimeter, please consult the owner.


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hi, can someone tell me the value of the resistor circled, i don't know which way to read it. thanks
 

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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.
 
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