RE: HP 10529A Logic comparator

One more thing to add... you are comparing like with like?

I don't know from experience, but if you compared an 74LS (Low Power Schottkey?)
with a 74HC (High Speed ???) then you would probably get output comparison
glitches caused by the speed differences.

I don't know if this would tigger an output error flash, though.

Welcome to analogue digital electronics :-)

Phil.

> -----Original Message-----
> From: owner-techtoolslist@flippers.com
> [mailto:owner-techtoolslist@flippers.com]On Behalf Of Martin White
> Sent: 29 March 2004 20:19
> To: TechToolsList@flippers.com
> Subject: HP 10529A Logic comparator
>
>
> Has anyone ever made a specific list of 74 series chips that this cannot
> successfully diagnose?
>
> Or does it depend on the circuit in which they're placed (what the inputs /
> outputs are tied to)?
>
> I seem to remember being told once that it can't always successfully diagnose
> certain logic chips. I don't have enough field experience to know when i use
> it if the results I'm getting indicate a faulty IC or just an IC it can't
> reliably diagnose. In fact, so far i don't think it's been of any use to me
> whatsoever.
>
> Obviously i'm ignoring those with more than 16 pins!
>
> More specifically, i was looking at some 74LS157's the other day that
> are part
> of a 2 to 1 multiplexer prior to some ram ICs. The one that had the WE lines
> as two of the outputs was showing a fault on both of them, but replacing it
> made no difference, i thus assumed the comparator was giving a false positive
> (or negative!).
>
> Was this right, or should i really continue to suspect that IC? It's
> definately in the part of the schematics where my problem lies.
>
> Please excuse if it's a bit of a dumb question to some, but i'm merely trying
> to familiarise myself better with some of the tools that i've picked up over
> the course of the last few years.
>
> Thanks,
> Martin.
>
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Received on Mon Mar 29 16:58:41 2004