[time-nuts] HP 5328A Divider / Timebase Output performance

John Miles jmiles at pop.net
Wed Mar 17 21:17:57 UTC 2010


Phase wraps are removed automatically by TI (as long as you tell it what
frequency your input data is at).  It's usually pretty obvious if something
goes wrong with the phase-unwrapping process, as you'll see one or more
large jumps in both the unwrapped-phase and ADEV plots.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Magnus Danielson
> Sent: Wednesday, March 17, 2010 12:53 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] HP 5328A Divider / Timebase Output performance
>
>
> Bert, VE2ZAZ wrote:
> > OK, I am doing a 24-hour ADEV analysis of the HP 5328A Timebase
> Output when set to divide-by-10,000,000. I use the 10MHz output
> from an HP 8644A sig.gen. OCXO. I split that 10MHz signal into
> two; one end goes to the the input of the HP 5328A counter. The
> other 10MHz end goes to the Stop input of the 5370A. The Start
> input gets the 5328A Timebase Output PPS. The 5370A is free
> running. I have included the plot of what I get so far.
> >
> > I would tend to say that the divider is pretty lousy for short
> term, but it is all fine for longer runs, right?
>
> Do you have any cycle slips in the measurement series?
>
> You should remove those if they occur before ADEV processing.
>
> You could get better results than those presented from that technology,
> but maybe this mode isn't the best.
>
> If you send me the data offlist I could look at it if you want.
>
> Cheers,
> Magnus
>
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