Products > Test Equipment
HP 5316A Teardown and Frequency Standard
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softfoot:
A very interesting thread - I wonder if anyone in the UK has a spare OCXO board for the 5316A ??
Please contact me offline if so.
Many thanks,
Dave
hvontres:

--- Quote from: hvontres on December 30, 2022, 12:46:36 am ---Hi, I was wondering if anybody had any spare PCB's for the OCXO option? I will be getting a 5316A soon and would like to install one. if not, I'll go and get some made at PCB way.

--- End quote ---

I have three extra PCB's in the US if anyone is interested.
hvontres:
Finally got my board working and installed. Turns out a lot of cheap LM317 Voltage regs use the LM317-L die internally, so even though they look like a full fleged 1.5A regulator, they crap out at 200ma. I almost returned my two OCXOs since they really don't run well on 2.5V instead of 5V. Once I put in a nice vintage LM317-T, the board has been working great.
Kjo:
I have collected maybe 6 versions of the 5315A/B 5316A/B over the years. The earliest 15A is series 1928A (1978-78), but there are 4-5 series even older. None of these had an option 004 OCXO as far as I can determine. Up through the 1928A at least, the basic 10Mhz osc was on main A1 PCB. And the 6pin jack was used for a TCXO.
The series 2xxxA look to have eliminated the A1 osc for a basic, TCXO, OCXO plugin oscillator. I think this is important because pin 6 of J2 is used differently in various 5315A/B as well as in the 5316 series.

Unfortunately, only the 5315 series 1824 service manual in the wild has complete schematics. (Although I have an OEM manual for the 1928A series.) The bottom line I am getting at is that the amc184 PCB gerbers tie pin 1 & 6 together and this could be a problem for some 5315 PCBs. It is best, I think, to not include a pin 6 when working with a 5315.
Feedback desired.
Kjo:
Another thing that bugs me about equipment manuals on the internet is the abundance of incomplete pdf files. There are dozens of HP5315 manuals missing section 8 and all the schematics. There also seems to be a level of ignorance in that the series prefix releases in this type of equipment. Manuals that match the series one has in hand are indispensable.
Unfortunately, keysight only published a very early 1978 complete manual. There were more than a dozen series after that. I would like to see schematics from a 21xxA series.
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