Hi Chris, First up is the chip under test actually faulty? As the Bugtrap is usually faster and more accurate than the HP... You can test the Bugtrap out on a 20 pin chip for example, like an LS244 or LS374 under use, and poke the chip under test with a logic pulser on each pin, and see if each Bugtrap LED comes on to suit.. Note if you poke an input to the IC under test the bugtrap may also light up the output LED on that IC... Yes you do only have to push inward the VCC and GND pin switches, all the rest stay out. Cheers, Marc ----- Original Message ----- From: "Chris Toseland" <Chris@muppzlab.co.uk> To: "TechToolsList (E-mail)" <TechToolsList@flippers.com> Sent: Tuesday, April 06, 2004 8:26 PM Subject: Bugtrap Help
Hi All,
I've aquired a Bugtrap 2074A all boxed with manuals condition unknown and was trying to do a comparison against my HP comparator to ascertain it's condition.
My problem is this: The HP identified a faulty o/p on a 74ls20 chip so I dropped the bugtrap on and it says it's fine, or rather I should say no leds came on after I pressed the reset button (some where on before). I'm using the same 'known good' comparison chip and I've buzzed the ribbon cables out and there are no breaks. And I did have the power clips connected :o)
I cracked the bugtrap open and there doesn't seem to be anything obviously blown though I note that someones replaced one of the power supply protection diodes in it at some point.
So I suppose my quesion is, from the manual it appears that you only need to switch in the VCC and GND signals and not worry about setting I/P and O/P like the HP am I reading this correctly or just being dumb?
Cheers
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