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HP 5316A Teardown and Frequency Standard

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beastor:
Picked up a 5316A with the 1GHz C input from eBay.   Checked it against my Louis Scully GPSDO and it was out by 23Hz, but the adjustment screw was already at the maximum, so I decided to use the board from amc - it works a treat!

Even though mine didn't have the 'Option 4' marked on the rear, it looks like it had that retrofitted afterwards?  Semi-officially?

Picture included below of the board I replaced.

Thanks again amc!

alitronix:
Hello , I have the HP 5315 A model unit with fried transformer ,
can anybody tell me the transformer deliver 2x8 or 2x7 AC V? (on 5315A model)
I can't find it on manual (sorry in case if is there the value and  i miss it  |O) .

If I put 2x9V or 2 x10V it is ok? (this what I have ).
Thanks in advance.

bdunham7:

--- Quote from: alitronix on May 14, 2022, 12:35:19 pm ---Hello , I have the HP 5315 A model unit with fried transformer ,
can anybody tell me the transformer deliver 2x8 or 2x7 AC V? (on 5315A model)
I can't find it on manual (sorry in case if is there the value and  i miss it  |O) .

If I put 2x9V or 2 x10V it is ok? (this what I have ).
Thanks in advance.

--- End quote ---

The unregulated DC supplies are +/- 7.5V and they have the 4-way line input selection (100/120/220/240) which sort of indicates to me that they anticipate that unregulated supply will be within 10% or so of nominal.  Increasing the transformer voltage would add heat stress to the regulators and I don't know how much they can tolerate.

I measured the transformer output on my 5316B for you to compare to (it should be the same circuit) and with the unit off but plugged in--which means the unregulated DC bus is powered and on mine, the OCXO is warm--I get 15.4VAC.  With the unit powered on I get 14.6VAC.  So I'm guessing that an appropriate transformer would be 7.2V nominal and about 8.0V no-load on each winding if you were using a 2-winding transformer in a CT configuration.  9 or 10VAC would probably work at first, but may burn something up in short order.

alitronix:
Thank you for support ,
It is impossible to find here in Europe a 2X7 VAC transformer at a reasonable price...
I just find on eBay a 2x8 VAC ,is not the same old stile format but I will be able to put in with no hardware changes ,
I believe will be OK for the moment and meantime I will search for a original one or something very similar.

I powered it up with external AC variable power supply just for test and seems to work fine.

Thank you for help, much more clear now.

hvontres:
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.

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