there is an
article about signature analysis.
Otherwise the service manual of the HP 5004
or 5006 should
help you further.
The signature check is related to the CRC check.
-Rik
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at
classiccmp.org
[mailto:cctalk-bounces at
classiccmp.org] Namens vp
Verzonden: donderdag 4 juni 2009 21:16
Aan: cctalk at
classiccmp.org
Onderwerp: Repairing an HP3421A (Signature Analysis)
I am trying to repair an HP3421A data acquisition and control
unit that fails its power on tests.
In the service manual it refers to a number of "Signature Analysis"
tests that essentially mean that the unit runs some
diagnostic routine and you go and collect "signatures" from
various test points.
Unfortunately I do not have a device to compute these signatures.
Does anybody know how to calculate them using a logic
analyzer (I have a Bitscope and an HP 1630D), or something similar?
Thanks
**vp