Products > Test Equipment
HP 735A DC Transfer Standard
(1/7) > >>
gilbenl:
Another vintage piece of HP gear. I've been hunting one of these for a while and managed to get one off a member here. (THANKS!) Still looking for 3 more for a project, but wanted to share some pictures of one of these rare little boxes. Direct competitor with the Fluke 731, but lacks battery backup and 10V range. The Standard cell->1.018V output is 2ppm on both; the Fluke claims better performance on the standard cell->1V at 3ppm vs 10ppm on the HP.


P.S.:I followed the "Calibratory reference standard" thread and couldn't help but chuckle when I saw the "Stability" plot on this unit and then thought about the elaborate gilded lily test setups and parameters folks wanted. In 1969, you just left the sucker on for a month and had some poor sap plot the drift every week. Character.





Vgkid:
Very cool, thanks for the upload. So are you going to tear down the oven?
TimFox:
Any idea who manufactured the red precision resistors in the last photo?
gilbenl:
I wish I could crack open the oven, but the manual indicates that it is not serviceable. It is replaced as an entire unit if something goes awry.

The parts list says HP was the manufacturer of all of the precision resistors.

One of the old caps is leaking so I'll be putting up some additional pictures when I get around to replacing the two.
Vgkid:
I was curious to see if they built the oven in the same was as the HP105A,6012 crystal oscillator.
Navigation
Message Index
Next page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod