Products > Test Equipment

HP 5316A Teardown and Frequency Standard

<< < (3/22) > >>

nixxon:
Thank you for the information and pictures. Very interesting. There are a few different versions of the 5315A/B manual, corresponding to different serial prefixes. The manual covering my unit has the 2120A serial prefix and is printed in 1981. I will figure out the pins in my unit, to compare with the 5316 pinout.

For some reason, the 5315A/B manuals I have found are missing the service section (VIII).
The 5316A manual does however include Section VIII with Service info and the schematics of the OEM OCXO as well.

nixxon:

--- Quote from: amc184 on November 13, 2014, 11:00:50 pm ---I've had a look at the HP 5315A/B service manual, and it looks like the 6 pin header's pinout might be different to a 5316A/B.  However, that same manual also suggests that a 5315 would have the basic oscillator built into the mainboard, and a plug in module would only be used for the options, so it clearly doesn't match your 5315A.  Here's the pinout for the 5316A and my module:

1) VCC (roughly 10VDC, unregulated)
2) RF
3) GND
4) NC
5) NC
6) VCC (roughly 10VDC, unregulated)

It'd be good if you could have a look at your 5315A and determine its pinout.

--- End quote ---

The pinout of the 5315A is the same as the 5316A (pin 1 closest to the corner):

1) ~+8.8 V (with 600 mV sawtooth ripple)
2) 10 MHz (Fluke 87: ~+1.44V)
3) GND
4) +5.00 V
5) NC (+0.001V)
6) ~+ 9.5V

Enclosed is a screenshot of the signal on pin 2. My Rigol 1102 (1052 with mod) oscillator is in sync with the 5315A oscillator, showing 10.0000 MHz and sometimes 9.99999 MHz). The Rigol Vrms Offset is identical to that of the Fluke 87: +1.44V.

I now wish I had an "HP 5316A OPTION 004 EQUIVALENT" PCB to populate with, along other components, my recent eBay order of a "MORION MV85A OCXO"...

amc184:
It looks like the PCB will work.  The pinout for the earlier 5315 was:

1) NC
2) RF
3) GND
4) VCC (5V regulated)
5) NC
6) NC

So it looks like your later 5315 is designed to allow the use of either type of module.  I'll PM you about getting a PCB shipped to you.  I've also attached the schematic, design files and gerber.  Anyone should feel free to use them to make their own PCBs, or modify them to suit their own counter.  They're made with DipTrace, the type numbers in the bill of materials are element14 part numbers.

nixxon:
That is very kind of you. Thank you very much  :-+

It seems that my Siglent SDG1020 is the one instrument of mine that is out of sync (18 ppm). In that regard, I am looking forward to receiving a $25 "1PCS Vanguard TCXO 0.1ppm 25.000MHz Ultra precision Golden Oscillator AQ" that I ordered the other day from along1986090 on eBay. Both this and the other oscillator (OCXO for the HP) hopefully arrive in time for the Christmas holidays.

Some good reading on "Understanding Frequency Counter Specifications" by HP:
http://www.leapsecond.com/pdf/an200-4.pdf

mweymarn:
amc184 kindly sent me one of his PCBs. I used it to upgrade the timebase of my HP 5316B. This counter has a slightly different mechanical layout, nevertheless the PCB fits perfectly as can be seen in the photo.

Unified standoffs and spacers are hard to come by in Europe. Luckily standard M3 10mm standoffs fit perfectly. Although a little tight the M3 screws can be run through the 6-32 nuts which are riveted to the counter's main board.

The OCXO calibrates very well and is extremely stable. An amazing upgrade, especially compared to the standard timebase!

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod