The HP 3439A has been repaired. It was C8 on A9 that had failed.
I then zeroed the readout it using a calibration procedure found at
.
Thanks to everyone who replied. I also have a service manual
on the way to me from Joe VE7LBI.
Question - I zero the readout after a 30minute warmup. All ranges
read 0000 with the + & - flashing alternately. The Int Check -8000
is also set per the precedure. It will stay like that (zeroed) all
day. If I turn it off then back on the next day - the zero
calibration is off - not by much - sometimes +0001 or -0002. I can
zero it again - and it will stay like that all day. Is this normal
or am I being anal about a +35 year old instrument?
Thank
BL
--- In hp_agilent_equipment@..., "computeruser04"
<computeruser@s...> wrote:
Hello All
I was just given an old HP 3439A Digital Voltmeter to play with.
It has the 3443 High Gain/Auto Range plugin. The Nixie tubes
light but display random digits. I have searched for a schematic
and found nothing. Really, like others have said here before, its
the challenge to see if I can get it functioning, so any info about
it is appreciated.
Thanks
BL
