Hi
All,
This Weekend I've
been trying to use my HP Logic Comparator to help fault find some boards and am
getting some very hit and miss results.
What I'd like to
know is are there certain chips that this equipment won't test
correctly?
I know that if an
output is onto a bus it'll read bad but what about simple stuff like
74ls04 it fails that then works fine with a 74ls08. It definately
doesn't like 74ls283's.
I have tried 3 or 4
different comparison IC's so it's not down to a bad one of
them.
It even fails chips
on known working boards that I'm using for signal comparison with the
scope.
I'd like to use it
so I can some of my backlog out of the way but it seems just to unreliable for
serious fault finding.
Do I just put it
down to tarnished IC legs or something? Any of you have any
input?
thanks
Chris