4 Sep
2009
4 Sep
'09
11:02 a.m.
I have the signature analyser and the logic
comparator.
The signature analyser is usefull if you have a HP equipment with the
according serv. Manual under test.
Sure, the service manuals often give the signatures. So you connect up
the signature analyser (start/stop/clock leads) and stick the probe on a
given point. If the signature agrees with the one in the manual, fine. If
it doesn't, then what? OK, there's a fault, but in a lot of complicated
systesm, particularly if state-machine or microprocessor based, a fault
just about anywherre will corrupt all the signatures, So how do you
determine which device has actually failed?
Fault finding goes rather quick then, the logic
comparator is only usefull
with clock frequenties below aprox. 10Mhz above that the cable impedance is
to big.
Using a Fluke 9100A boardtester is much more usefull, because you can test
in cuircit ram, drivers and processor.
I keep the HP stuff for collecting purpose ;-)
To be honest, if I saw either instrument at a low-ish price (including
shipping!), I'd probably buy it. I like HP stuff :-)
And it's nicely build...
You do not need to tell me that :-)
-tony