[time-nuts] Re: Ref out on Keysight 53230A

[Bill Notfaded]

I also have a 53230A.  Maybe comparing the freq out to the source of a good
short and long term reference with a couple SRS620 would be worth doing?

Bill

On Thu, Jan 19, 2023, 5:08 PM Bob Camp via time-nuts <
time-nuts at lists.febo.com> wrote:

> Hi
>
> About as far as I can go on this one:
>
> Early on TVB got ahold of an example of one of these. He did some testing
> and was
> not real excited by the results. He posted the info here on the list and
> most of us avoided
> the counters as a result.
>
> Eventually ( being the insane person that you all know me to be ) I gave
> one a try. The
> YouTube video roped me in :). What can I say? marketing works ….
>
> I dug into this and that. I duplicated (and improved on) the data in the
> video. The big issue
> seemed to be the Ref out. For me that was OK since I’m not going to daisy
> chain the units.
> They all will run on an external standard of some sort. Yes’ it’s a shame
> you can’t use that
> OCXO in the counter ( if you got that option) for anything. The caution
> from TVB is spot
> on in this respect.
>
> Best guess from looking at what’s going on:
>
> When they get done with a series of readings, the power demand drops
> abruptly.
> ( = whatever it is does correlate with measurements ending). That load
> dump on
> the power supply / ground creates a bump somehow ( there’s none obvious,
> but
> I’d bet there’s one there …). That dump puts a phase hit on the ref out. (
> = Watch
> then ref out and you can see it has issues relative to ref in.)
>
> So not very scientific. I dug in a bit, but didn’t find anything obvious.
> Since it was
> not a big deal for me, I stopped digging.
>
> Bob
>
> > On Jan 19, 2023, at 2:10 PM, Hal Murray via time-nuts <
> time-nuts at lists.febo.com> wrote:
> >
> >
> > Bob Camp said:
> >> The other rabbit hole involves the 5323x counters in general. Their ref
> out
> >> ports have issues.  One could be a bit more descriptive, but this is a
> public
> >> list.
> >
> > What did they do wrong?  There must be an educational story behind that.
> >
> >
> > --
> > These are my opinions.  I hate spam.
> >
> >
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