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<DIV><SPAN class=687271212-28072003><FONT face=Arial size=2>Hi
All,</FONT></SPAN></DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial size=2>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.</FONT></SPAN></DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial size=2>What I'd like to
know is are there certain chips that this equipment won't test
correctly?</FONT></SPAN></DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial size=2>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.</FONT></SPAN></DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial size=2>I have tried 3 or 4
different comparison IC's so it's not down to a bad one of
them.</FONT></SPAN></DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial size=2>It even fails chips
on known working boards that I'm using for signal comparison with the
scope.</FONT></SPAN></DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial size=2>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.</FONT></SPAN></DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial size=2>Do I just put it
down to tarnished IC legs or something? Any of you have any
input?</FONT></SPAN></DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial
size=2>thanks</FONT></SPAN></DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial
size=2>Chris</FONT></SPAN></DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=687271212-28072003><FONT face=Arial size=2><A
href="http://www.muppzlab.co.uk">http://www.muppzlab.co.uk</A></FONT></SPAN></DIV></BODY></HTML>
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Received on Mon Jul 28 09:31:22 2003
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