In message <7862525b-4879-0c7c-c13a-9a6c1f4a3...@freenet.de>, "Dr. Frank" write
s:
Up to then, it was easy to buy and insert four 62256 SRAMs and get the
01 option for maybe 30€.
I've done that directly in 1989, for my first 3458A @ university, later
in 2009 for my o
It's still there, 03458-88810 Prgmd Pal-1819-0239 For 001, costs 31.83€.
The official upgrade costs 698€.
Somebody in another forum explained, that this PAL is all you need.
Frank
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Hello David,
the 3458A is not offered any more by the usual distributors here in
Germany, like datatec or Meilhouse.
That's due to EU:RoHS directive , i.e. leadfree soldering is required,
and the last exemption for 'measuring and displaying devices' ran out as
of July 2017.
So KS found a
Surely the AC errors if any must be associated with the A2 AC Convertor board -
03458-66502? >> Dave
Why should this be a hardware error???
It's much much more probable, that this is a natural drift phenomenon.
This is 'as found' and the 'as left' report is missing, that would tell
the
I also saw this, so at least, they will have adjusted this range.
Yes you're right, the ADC is the A3 board. I confused that with the A5
controller board, which is the only one which had been redesigned to SMT
components.
There's no chance to identify a refurbished or replaced board, other
David,
that instrument on ebay is definitely from the agilent area, i.e. built
after 2000.
It is really ok, and does not need any repair.
Obviously, this AC range is a bit outside calibration @ 3V, 4MHz, but
that is normal after some years w/o adjustment, and not a defect at all.
Probably
David,
I've thought a bit further about this excessive offset of at least 8µV.
That could be simply due to excessive offset of the DC amplifier part of
the meter amplifier, caused by ageing, i.e. drifted resistors or faulty
elctrolytics.
The chopper has about 5000x ac gain, due to
Randy,
'quarks' is another volt-nuts companion.
His instrument is from 1989, and we both changed all nvSRAMs in our 3458As.
The complete designations are: DS1220AD-150+ and DS1230Y-150+.
If the 1230 battery fails, you will get failure messages on booting the
3458A, and your stored settings
Another probable error in the manual, on page 5-8 (80), diagram, which
shows the monitoring of the neon currents:
That diagram is ok for the A-version, as both neon currents are measured
with the same polarity in its oscillator circuit.
The B-version anyhow should look different, as the
Hello Dave,
in the schematic, the polarity of the diodes in series with the neon
bulbs is definitely wrong.
If you compare with the 3420A on page 7-7 (29), but also with the Fluke
845 which is similar, both neons have to be switched at 180°.
Maybe someone else has erroneously reversed one
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