[time-nuts] Oscilloquartz 3210 Cesium Standard
syseng.greenfield at btconnect.com
Fri Sep 5 12:10:56 EDT 2014
Just catching up and time for an update on progress. Had had to put the
faulty 3210 to one side this week to get some work done, but a couple of
developments meantime: First: Put an enquiry on the Oscilloquartz web
enquiry form a week or so ago and they sent me the full 3210 pdf manual.
Theory, adjustments and full schematics. Needless to say very grateful
and sent back an email thanking them. Although there were no conditions
attached, I have to assume it was sent in confidence, so can't upload to
a file share site, but if anyone needs a copy, please contact me off
list. Thanks to Tom for scanning his manual as well. It looks like an
earlier version than I have and there seem to be minor differences, so a
scan of the whole thing would be good, if possible. I have a Panasonic
doc scanner, A4 A3, long and user defined pages, colour etc (Ebay, 20
ukp :-) and could scan the whole volume if you are in the UK. Second: I
had a possible line on two more of these 3210's and offer accepted,
collected them yesterday. One blows the line fuse, which should be
simple fix, but the other one actually works. Ion current way off scale
to start, with one psu rail cycling on and off, but after an hour or
two, lock light on and integrator starting to fall back as the OCXO
warmed up. The 2nd harmonic, which was zero on the original unit,
started creeping up from just visible indication, to 4 of 10 after ~5
hours, then after running all night, shows full scale at 10, Utopia :-).
Valid range from the manual is 2-10, so this looks like a very good
tube. Am going to leave it running for a month, then go right through
the setup procedure.
Both units collected yesterday were each in a small subrack, with Racal
badged standbye psu + batteries and the whole rack marked as "Portable
Frequency Standard". That is, take to a site, power up, calibrate
whatever, then power down and put back in store. They may have done very
few hours, but that may be wishful thinking. Two still to fix then, but
now have a working unit for comparison and at last, a properly working
cesium standard for the lab. Thanks to everyone who replied here along
the way, the response and encouragement have been amazing...
cc this to tvb, in case this doesn't reach the list...
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