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HP 973A & 974A Multimeter Service Manual anyone?

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AMR Labs:
I recently acquired a HP973A DMM as an addition to my other three fully working HP974A's as in my opinion these are outstanding instruments, even though the "970" series (971A, 972A, 973A, and 974A) dates back to around 1994-2000 they will easily hold their own against any comparable Fluke, and remarkably only at a fraction of the cost. All of them except for one where basically still dead on calibrated after all these years. Built quality is excellent, both inside and outside, as with any HP product. Incidentally these where manufactured in Japan. Maybe by a major Japanese electronics company under contract for HP? Or under license?

So far I have tried to locate any web reference to a schematic or service manual for these DMM's without any luck. Same goes for the HP/Agilent website, and on the HP-IO group's messages. At this point I am not even sure there even where any service manuals that got released, as all hits always only seem to point to the user manual or brochures/spec sheets. The user manual (is more like a leaflet), in comparison to conventional HP manuals, is quite limited on technical and maintenance information, and contains no schematics or diagrams other than the location of the internal cal points and a calibration sequence.

Does anybody (that may have worked at HP, or otherwise) know if there where actually any service manuals for these DMMs that where made available? In my mind I would think there must be something out there as HP would most definitively have created some kind of detailed service literature, or at least a schematic for these DMMs, but maybe due to cost cutting measures the service information was excluded from the standard user manual. Then again these where manufactured in Japan, so maybe the company that made them under the HP brand actually never released any service literature in normal HP tradition.

Anyway, I would be very interested in anything technical related to the 973A/974A, other than the standard user manual or spec sheets. Or even to find out about the story of why this 970 series of DMMs where manufactured in Japan, which seems a bit odd for an HP product.

BTW the HP970A DMM is not really in any way similar to the rest of the 970 series I am interested in, but is more like a hand held probe style meter, for which there is some information available on the net.

Thanks for any leads.

EDIT: Added JPG image.

Tomorokoshi:
Hewlett Packard was in a joint venture with Yokogawa Electric from 1963 to 1999:
https://en.wikipedia.org/wiki/Hewlett-Packard

Specialty meters and impedance analyzer equipment were some of the key products from there:
www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1966-09.pdf

It may help to look to see if there is an equivalent Yokogawa Electric product.

AMR Labs:
Thank you very much for that info, very useful. A step closer to possibly finding what I am looking for.

Sounds possible that these 970 series multimeters might be an original product from the Yokogawa company that where relabeled as HP.

AMR Labs:
I did send an email inquiry about the service manual to Yokogawa, hope they will reply back.

Kosmic:
Look like the HP 970 series is similar to the Yokogawa 7537 series

Yokogawa 7537:




http://almateks.com/doc/dmm-e-150.pdf

My HP 974a:

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