Products > Test Equipment
HP 5316A Teardown and Frequency Standard
amc184:
I bought this HP 5316A from eBay, and it was another classic eBay purchase. It was sold as powering on but otherwise untested. When I got it, it partially worked but threw fault codes and was really, really sticky and brown. Maybe it was used by a smoker? It cleaned up nicely and the internals were pristine, so for USD36 it was a great deal.
I replaced the electrolytics and tantalums and the counter worked correctly. The only other thing that bothered me about it was that it was just the base model with a basic crystal as the frequency standard. There were two frequency standard options for the 5316A; 001 (a TCXO) and 004 (an OCXO). Looking at the service manual, these options were pretty simple, mainly just a regulator to bring the 8 to 10VDC standby supply down to whatever the TCXO or OCXO needs (5VDC in both cases). I designed a small PCB with a regulator and a Morion MV85A OCXO. These are available cheaply on eBay and require a 5VDC supply. Most require a 12VDC supply, and I really didn't want to have to have a step up supply, especially as the oven draws a fair bit of current on startup.
The PCB works well, it mounts on standoffs right where the original oscillator card sits. The calibration pot lines up okay with the hole in the rear panel, now I just have to figure out how I'm going to calibrate it ....
I have some spare PCBs as well, if you have a 5316A and want one PM me. I think it should work in a 5316B as well.
David Hess:
These are fabulous counters. I have an HP 5315A with the TCXO option which can be seen edge on in the photo below.
I calibrated mine using the 5 Hz timing output on my GPS and a long gate time.
psykok:
Hi,
Great work, I have the same counter but with TCXO option.
Alex
daqq:
Good job! Thanks for the peek inside!
nixxon:
I have agreed with a dude to pick up a HP 5315A with option 003 (1 GHz Channel C).
I am thinking about retrofitting a OCXO. I have noticed that (i.e. reading the last page here: https://www.valuetronics.com/Manuals/HP_5315A_HP_5316A.pdf) that the option 004 "High Stability OVEN Time Base" differs between the 5315A and the 5315B/5316A.
Do you think that the DIY option 004 equivalent that fits the 5315B/5316A will fit the 5315A anyway?
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