[time-nuts] Measuring Phase diference between different GPSDO

[Didier Juges]

Resetting the boards may not do, but resetting the chips that are in sockets probably will, based on my two 5370s

Didier KO4BB


"Mark C. Stephens" <marks at non-stop.com.au> wrote:

>It is as you said Bob, I plugged the 5370b in and It flashed a zero
>then the display and front panel are blank.
>
>It has some other equipment in service on top of it so when I get a
>chance for some downtime, I'll pull it out and reseat the boards.
>
>
>Wish me luck!
>
>
>mark
>
>-----Original Message-----
>From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>Behalf Of Bob Camp
>Sent: Friday, 3 May 2013 11:42 AM
>To: Discussion of precise time and frequency measurement
>Subject: Re: [time-nuts] Measuring Phase diference between different
>GPSDO
>
>Hi
>
>FIrst step is to fire up the 5370B counter and see if it works. If
>there's a problem re-seat all the boards and see if that fixes it.
>Simple way to check it is to let it count it's own reference. 
>
>Once you have that working, then yes, measuring time between PPS
>outputs is the way to go. 
>
>-------
>
>Assuming it is beyond help, then the PicTic counter board is a
>reasonable alternative. It will also let you measure between PPS's very
>accurately. 
>
>Both approaches are far more accurate than you will need for checking
>conventional OCXO based GPSDO's
>
>Bob
>
>
>On May 2, 2013, at 9:33 PM, Mark C. Stephens <marks at non-stop.com.au>
>wrote:
>
>> I'd like to perform some comparison between a known good GPSDO and
>some newcomers.
>> I want to adjust the crystal turning point as my new GPSDO tend to
>wander all over the place.
>> I see some of you are using the hp 3575A to do this.
>> 
>> Unfortunately, they are a little out of my price range at the moment.
>> 
>> What I do have is a an ancient hp 8407a with both 8412a and b Phase
>magnitude display and a 8413a phase/gain indicator.
>> Is there any way they are usable to achieve the desired measurement?
>> 
>> A also have a hp 5370b timer. I am not sure if it still works, but
>anyway, would measuring the PPS be an easier option?
>> 
>> I also hear mention of a PICTIC, what is that?
>> 
>> 
>> Many thanks,
>> Mark
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