<x-html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.2800.1170" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Actually, I just picked up an HP comparator too. I
had deferred getting one, mostly because of kev's comments:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2><A
href="http://users.erols.com/mowerman/bugtrap.htm">http://users.erols.com/mowerman/bugtrap.htm</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>(This is a "Bug Trap" but I believe it's pretty
much the same concept).</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I'll be very interested to hear how you make out. I
tend to use a logic probe for checking most of the 74xxx chips, but there are a
couple chips, like shift registers, that I can't test that way. I'm hoping that
the logic comparator can help. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>--James Bright<BR><A
href="http://www.QuarterArcade.com">www.QuarterArcade.com</A><BR>Restored Arcade
Games for your Home</DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=chris.toseland@raxcosoftware.com
href="mailto:chris.toseland@raxcosoftware.com">Chris Toseland</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=TechToolsList@flippers.com
href="mailto:TechToolsList@flippers.com">TechToolsList (E-mail)</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, July 28, 2003 8:24 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> HP Logic Comparators</DIV>
<DIV><BR></DIV>
<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></BLOCKQUOTE></BODY></HTML>
</x-html>
Received on Mon Jul 28 09:31:23 2003
This archive was generated by hypermail 2.1.8 : Tue Dec 02 2003 - 18:40:53 EST