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From: "Frithiof Andreas Jensen"
Subject: Re: question on measuring temperarures at high voltages
Date: Wed, 23 Oct 2002 13:15:51 +0200
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
"Kooner" wrote in message
> 1. The thermocouple acts as an antenna picking up EM fields that
> induce a voltage.
Probably - It will not take much capacitance to drive a decent current @ 10
> 2. The body is not totally isolated from the high voltage leads.
Likely - The isolation distance for 10 kV on a surface will be about 20 mm
or 4/5 of one Inch (for you non-metric types). I do not think a TO220
housing meets this requirement!
> I would be very interested in any comments.
You are about to become a Darwin Award winner!
Use the "sticky tape" thermal labels or - if accuracy and real-time
measurement is an issue - rent an infrared video camera and photograph the
thing. Attaching a conductor to 10 kV, using some dubious insulator as a
TO220 housing with perhaps 1 mm of plastics between 10 kV on a bonding wire
as safety insulation is literally begging to get zapped!
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