From: "Leon Heller"
Subject: Re: cheap IR camera?
Date: Thu, 19 Sep 2002 17:48:52 +0000 (UTC)
Organization: BT Openworld
NNTP-Posting-Date: Thu, 19 Sep 2002 17:48:52 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 5.50.4807.1700
"George Gonzalez" wrote in message
> Lately I've been resuscitating a pallet-load of Tek 465 and 475 scopes.
> Some have easy-to-find problems with the power supply-- dried up
> bad bridge rectifiers.
> Most of the rest have shorted tantalum capacitors from one of the power
> supplies (-8, -15, +5, +15) to ground. These are a bit difficult to
> as there are many caps sprinkled around the boards. The method I'm using
> now is to push a few amps into the shorted power bus with an external
> supply, then feel around for warm or hot capacitors.
> This isnt a very good method, as it's hard on the series decoupling
> wound with like #30 wire, they get a lot warmer than optimum. Also
> depending on the severity of the short, the capacitor can get anything
> just barely warm, to finger-burning HOT.
> Are there any reasonably priced IR sensors, like a small CCD TV camera?
> Last one I saw was 1000's of $, but that was a couple decades ago.
CCDs tend to be quite sensitive to IR. You could try putting an ambient
light filter in front of an ordinary camera and see if it will detect the IR
emitted by the hot components.
The co. I used to work for makes a low-cost thermal imager (I had some
involvement in its development): http://www.irisys.co.uk
Leon Heller, G1HSM