[time-nuts] buying a time interval counter

[Stéphane Rey]

I will try to buy one of these SR620. I've some Standford & Research 
products like the 535 or the 30 MHz DDS generator. I do admit I'm not 
fan of the front panel interface as well but this is ok and usable. The 
SR620 would probably be PC controlled anyway to automate some 
measurements.
The 10 MHz reference will come from a GPSDO which is broadcasted over 
optical fibers. However the optical SFPs have been tested to have 500fs 
RMS jitter which mich be pretty high for that.
I've a Thunderbolt GPSDO sleeping in a box that will do the job 
otherwise. I plan to buy a Rb oscillator for reference for DTMD method 
and design a small circuit for the downmixing.
To be continued.
Thanks for the comments
Stephane


------ Message d'origine ------
De : "Brooke Clarke" <brooke at pacific.net>
À : "Stéphane Rey" <steph.rey at wanadoo.fr>; "Discussion of precise time 
and frequency measurement" <time-nuts at febo.com>
Envoyé 29/06/2016 19:20:22
Objet : Re: [time-nuts] buying a time interval counter

>Hi Stephane:
>
>I traded my HP 53132A counter for an SR 620.  The 53132 has what I'd 
>call a user hostile interface, so if you are manually controlling the 
>counter the SR 620 has a huge advantage.
>I also like the long display on the 620 which can be read from across 
>the room.
>
>PS Stanford Research is a company founded by physicists and makes some 
>really high quality stuff.  In fact some of the products 
>HP/Agilent/Keysight sells are repackaged SR instruments.
>http://www.prc68.com/I/TandFTE.shtml#SR620
>
>The claim to fame for the HP 53132A is that it can make a frequency 
>(not time interval) measurement to 1E12 in a second.  Here's how to get 
>that same result with the SR620:
>http://www.prc68.com/I/FTS4060.shtml#SR620Fast
>
>On the down side the printing functions on the 620 require an Epsom 
>printer.  Does anyone have a solution for that?
>
>PS SR also makes a 10 MHz crystal oscillator that has options trading 
>stability for aging as well as the EFC tuning polarity and range so as 
>to match other OCXOs.
>http://prc68.com/I/TandFTE.shtml#SC10
>
>At one point they were looking into making a GPS time receiver where 
>the cable length calibration would be built-in.
>
>-- Have Fun,
>
>Brooke Clarke
>http://www.PRC68.com
>http://www.end2partygovernment.com/2012Issues.html
>The lesser of evils is still evil.
>
>-------- Original Message --------
>>Hello there,
>>
>>I'm planning to buy a such instrument in order to do some frequency 
>>stability measurement at work. The SR620 seems to be discontinued. 
>>What model still distributed would you think is good for that at the 
>>moment ?
>>
>>Thanks & cheers
>>Stephane
>>_______________________________________________
>>time-nuts mailing list -- time-nuts at febo.com
>>To unsubscribe, go to 
>>https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>and follow the instructions there.
>>
>


---
L'absence de virus dans ce courrier électronique a été vérifiée par le logiciel antivirus Avast.
https://www.avast.com/antivirus