HP 5212A Electronic Counter Kirt's Cogitations™
This rare HP 5212A Electronic Counter was
found in a second-hand shop sitting in with a bunch of random electronic gear. The "HP"
on the front panel piqued my attention, so I carried it to the sales desk and asked the
nice lady to plug it in, figuring if the front panel lit up and none of the smoke that
makes electronics work leaked out, I'd buy it. It did, it didn't, and I did, respectively.
The outside condition is pretty good, with most of the scratches being on the top and
bottom. Some oxidation is present on the bare aluminum chassis components, but a little
rubbing with a
Scotch−Brite pad and some clear lacquer would take care of
that. You can order matching paint from numerous suppliers if you want to completely
restore the top and bottom covers. The front panel is in very nice condition and really
does not need rework. It could easily be restored to museum quality.
The HP 5212A Electronic Counter uses all solid state circuitry - probably one
of the first such products from Hewlett-Packard. Its vintage is sometime in the mid 1960's.
According to documentation* found on the HPArchive.com website, the maximum calibrated operational frequency
is 300 kHz, although my tests show it works up to 550 kHz with sine, square,
and triangle waveforms. Both frequency and period can be measured, and there is a cycle
counter as well, all of which appear to function properly. The internal reference oscillator
was used in my tests, but there is a jack and switch on the rear panel for using an external
reference if available. A parallel port plotter / recorder connector is provided on the
rear panel, but I did not test it.
I removed the top, bottom , and side covers and carefully removed all the plug-in
printed circuit boards for cleaning. The covers, frame, and front and rear panels were
cleaned with Windex. A vacuum cleaner and compressed air got rid of most of the accumulated
internal dust (of which there was amazingly very little).
CRC QD Electronic Cleaner was sprayed on all the PCB edge contacts
and the chassis connectors, and then the PCBs were re-installed. CRC cleaner was also
used on the switch contacts and on the external connectors. A careful "sniff test" did
not reveal any suspected overheated components. Both fuses were in good condition.
At first I started taking a bunch of photos with a signal generator sitting on top
of the HP 5212A Electronic Counter to show good agreement between the modern instrument
and the vintage instrument, but then decided that a short video would do a better job.
I have finally listed the
HP 5212 Electronic Counter for sale on eBay.
Please contact me if you would like to buy it. An extensive search has turned up zero
instances of this piece anywhere, so it is likely extremely rare, and therefore valuable
to a collector - especially for one in what seems to be excellent working order.
If a picture is worth a thousand words, then there are more than 30,000 words worth
of descriptions on this page. Enjoy.