[time-nuts] Is Timelab with a Prologix-Eth and a PM6680 - working ?

Azelio Boriani azelio.boriani at screen.it
Tue Jul 3 16:11:26 UTC 2012


When you start TimeLab, which mode does the PM6680 show? FREQ A or TIME A-B?

On Tue, Jul 3, 2012 at 5:46 PM, cfo <xnews3 at luna.dyndns.dk> wrote:

> On Tue, 03 Jul 2012 14:34:08 +0000, cfo wrote:
>
> > I just got a PM6680/016 - Std. Osc + GPIB + 1.3Ghz -Chan.C The best my
> > budget could afford :-)
> >
> > I would like to try out John's Timelab. But only have a
> > Prologix-Ethernet GPIB adapter , no USB version.
> >
> > I was wondering if anyone can confirm that Timelab would work on a
> > PM6680 , using a Prologix-Eth ?
> >
> Well (blush)
>
> I can ansver my own question here.
> Timelab autodetects the Prologix-Eth (with mac & ip) , and lists it below
> all the COMM-Ports. Nice work John ...
>
> So all i had to do was to select the detected Prologix , and set the
> PM6680 GPIB address.
>
> I'm acquiring data now , although not very impressive.
>
> I run my Tbolt signal through a Video Dist-Amp (400Mhz bw) , to get
> 6-channels. So i know the 75ohm imp there , but it's not been an issue so
> far.
>
> I feed the PM6680 Ext-Ref and Chan-A via a Dist-Amp output on a BNC-T.
> And have put a BNC-T on Chan-A with a 50ohm terminator on it.
> I have Chan-A set to 1Mohm , as i terminate the input via the BNC-T on
> Chan-A.
>
> But i wonder if the PM6680 Ext-Ref input already terminates with 50-ohm ,
> and that could be the issue ??
>
> The counter flickers occasionally in the last digit between 0 , 1 and 9
>
> And Timelab says ADEV is 9.442-E-6 on T=1000 Secs.
>
> I would have expected something better ....
>
> LH says the ADEV is Osc ADEV is 5.442-E-13 on 10000 Secs
>
> I wonder where i have FSCK'ed up , or is a Tbolt on Ext-Ref & the same
> signal on Chan-A supposed to show that ?
>
>
> CFO - (Feeling very T-Nut Beginner now)
>
>
>
>
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