[time-nuts] Re: Help with 5370B using BBB processor replacement

[Orin Eman]

Are you using the BBB board?  When I did, every so often I'd get a bad
reading.  I kind of worked out why, but fixing it would require punting
more of the acquisition code into the PRU.  I went back to the original
processor.

The other problem I had was that with the Prologix Ethernet GPIB,
communication would fail after a while.  (Network traces indicated it was
an ARP problem.)  This was fixed by actively triggering each reading by my
acquisition program.

This was quite a while ago...

Orin.


On Thu, Nov 27, 2025 at 6:19 PM John Miles via time-nuts <
time-nuts at lists.febo.com> wrote:

> I'd say definitely use talk-only mode when you can.  On a stock 5370B you
> would just need to flip the DIP switch on the back to TALK ONLY, then
> power-cycle or reset the counter.
>
> It can be a good idea to record the data in a simple terminal program when
> troubleshooting, as that eliminates TimeLab as a potential variable.  The
> terminal log can be imported afterward with "File->Import ASCII phase or
> frequency data."
>
> If you do want to acquire data directly from the 5370B, use
> "Acquire->Acquire from counter in talk-only mode" and tell it whether you
> are sending phase differences or frequency.  Enter the nominal frequency of
> the signal being measured in the "Input frequency" field and set the
> desired
> trace duration.
>
> Then, hit "Monitor" and you should see the readings scrolling by.  It will
> try to measure the incoming data rate and set the sampling interval
> automatically, but if it's much faster than 1 sample per second it's better
> to enter the sampling interval manually for accuracy.
>
> At that point, hit "Start Measurement" and it should start pulling in the
> data.
>
> -- john, KE5FX
>
>
> -----Original Message-----
> From: Skip Withrow via time-nuts <time-nuts at lists.febo.com>
>
> Any help would be appreciated.  Do you have to put the 5370B in talk only
> mode first? And how would you do that.
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