[time-nuts] HP Z3801A Question

ernieperes at aol.com ernieperes at aol.com
Thu Nov 13 10:14:08 EST 2008


Hi Björn,

According to HP spec sheet It should be better then just a few 1,5E10-9.

Rgds Ernie.


-----Original Message-----
From: Björn Gabrielsson <bg at lysator.liu.se>
To: Discussion of precise time and frequency measurement 
<time-nuts at febo.com>
Sent: Thu, 13 Nov 2008 12:35 pm
Subject: Re: [time-nuts] HP Z3801A Question



On Thu, 2008-11-13 at 05:44 -0500, ernieperes at aol.com wrote:
> Hello,
>
> I am running the HP Z3801A after a long time again, more then 150hrs
> from the new ON status but I have never seen
> on the " TI to GPS " small window better figure then 1,5E-9. the
> avarage is 1,3E-8 and seldom goes to 10E-9.
> And running parallel the FURY board with a TEMEX OCXO and displays
> +1,6E-10 is the average very often 10E-11 and sometimes for a 
relative
> short time / 4-5 min / 1,4E-12.

Are you comparing apples with apples?  some nanoseconds error in _phase_
(time) seem reasonable (for the HP) . A _frequency_ error in the range
of 1E-10 to 1E-12 is also reasonable (for the FURY).

But then I have neither of the units you compare, so I could have
misunderstood your issue.

--

   Björn


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