31 Jan
2002
31 Jan
'02
9:54 a.m.
On Thu, 31 Jan 2002, Tony Duell wrote:
Talking of 7475s. I have what appears to be an
IBM-badged HP7475 on the
bench at the moment. It's got an HPIB interface (labelled IEEE488, BTW).
I don't know if the firmware is the standard HP stuff or not -- the ROMs
have HP 1818-xxxx numbers but that doesn't mean much.
Can anyone remember how to run a 'confidence test' on the 7475? Pressing
2 buttons at once, and holding down a button while powering up doesn't
seem to do it. Nor does setting the HPIB address to 31 (normally illegal,
of course).
If I can attempt to run the test I can see (a) if the ROMs are certainly
different (if it doesn't run the test at all) and (b) if there's still a
'Hewlett Packard' or 'HP' on the test plot.
IIRC, mine had some sort of menu option for some internal tests, but I
don't recall a plot test. I did basic plot tests on my plotters from the
computer.
-Toth