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scope pick up

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m3vuv:
not sure if this is the rite place to post but here goes,ive 3 scopes,one is a tek 453,also a kenwood dso and an old heath computer dso,on all 3 when i touch the probe tip with my finger i get a trace that measures about 200volts,it does this on all 3 scopes!,its still the same with a 10x probe on 10x or 1x,is that sort of reading normal,or is my house wiring iffy?,cheers m3vuv.

bd139:
It’s completely normal.

m3vuv:
what its normal for it to read several hundred volts?

bd139:
Yep.

I can't remember the precise mechanism but you're basically a current source with a high compliance voltage and the input is high impedance so it'll show much higher voltage than you might expect.

Here's mine. Yes 214 p-p volts.

m3vuv:
ok cheers for that,learn something new every day,cheers,m3vuv.

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