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Discussion of precise time and frequency measurement

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Re: [time-nuts] buying a time interval counter

DD
Dr. David Kirkby (Kirkby Microwave Ltd)
Wed, Jun 29, 2016 4:22 PM

On 29 Jun 2016 17:02, "Stéphane Rey" steph.rey@wanadoo.fr wrote:

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.

It still looks available to me
http://www.thinksrs.com/products/SR620.htm

There is also a Keysight 53230A with a slightly better (20 ps vs 25 ps)
single shot resolution.  It looks more modern,  but I don't know how well
they compare.

Dave.

On 29 Jun 2016 17:02, "Stéphane Rey" <steph.rey@wanadoo.fr> wrote: > > 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. It still looks available to me http://www.thinksrs.com/products/SR620.htm There is also a Keysight 53230A with a slightly better (20 ps vs 25 ps) single shot resolution. It looks more modern, but I don't know how well they compare. Dave.
SR
Stéphane Rey
Wed, Jun 29, 2016 4:31 PM

Hi Dave,

Yep it looks like it's still available. I've seen discontinued on a
distributor website which made me thinking the product wasn't available
anymore.
I'll look what is the price for the HP53230A for comparison.

Cheers
Stephane

------ Message d'origine ------
De : "Dr. David Kirkby (Kirkby Microwave Ltd)"
drkirkby@kirkbymicrowave.co.uk
À : "Discussion of precise time and frequency measurement"
time-nuts@febo.com; "Stéphane Rey" steph.rey@wanadoo.fr
Envoyé 29/06/2016 18:22:50
Objet : Re: [time-nuts] buying a time interval counter

On 29 Jun 2016 17:02, "Stéphane Rey" steph.rey@wanadoo.fr wrote:

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.

It still looks available to me
http://www.thinksrs.com/products/SR620.htm

There is also a Keysight 53230A with a slightly better (20 ps vs 25 ps)
single shot resolution.  It looks more modern,  but I don't know how
well they compare.

Dave.

Hi Dave, Yep it looks like it's still available. I've seen discontinued on a distributor website which made me thinking the product wasn't available anymore. I'll look what is the price for the HP53230A for comparison. Cheers Stephane ------ Message d'origine ------ De : "Dr. David Kirkby (Kirkby Microwave Ltd)" <drkirkby@kirkbymicrowave.co.uk> À : "Discussion of precise time and frequency measurement" <time-nuts@febo.com>; "Stéphane Rey" <steph.rey@wanadoo.fr> Envoyé 29/06/2016 18:22:50 Objet : Re: [time-nuts] buying a time interval counter > >On 29 Jun 2016 17:02, "Stéphane Rey" <steph.rey@wanadoo.fr> wrote: > > > > 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. > >It still looks available to me >http://www.thinksrs.com/products/SR620.htm > >There is also a Keysight 53230A with a slightly better (20 ps vs 25 ps) >single shot resolution. It looks more modern, but I don't know how >well they compare. > >Dave. >
R(
Richard (Rick) Karlquist
Thu, Jun 30, 2016 12:18 AM

On 6/29/2016 9:22 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:

There is also a Keysight 53230A with a slightly better (20 ps vs 25 ps)
single shot resolution.  It looks more modern,  but I don't know how well
they compare.

Dave.

The 53230A does not offer a 10811 option, but instead offers some
greatly inferior OCXO.  Don't waste your money on this oscillator.
If you're reading time-nuts, you probably already have a 10811
or equivalent anyway.  The counter itself has the interesting
feature of being able to display Allan deviation using its
own internal math engine.  What I have found is that Hadamard
deviation is a lot more useful for screening oscillators, but
all you get with the 53230 is Allan.  If you're reading time-nuts,
you can probably figure out how to calculate the DEV du jour.
(There are actually many flavors, as we know).  Given the price
of the 53230A, I just don't see a value proposition there.

Rick N6RK

On 6/29/2016 9:22 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote: > > There is also a Keysight 53230A with a slightly better (20 ps vs 25 ps) > single shot resolution. It looks more modern, but I don't know how well > they compare. > > Dave. The 53230A does not offer a 10811 option, but instead offers some greatly inferior OCXO. Don't waste your money on this oscillator. If you're reading time-nuts, you probably already have a 10811 or equivalent anyway. The counter itself has the interesting feature of being able to display Allan deviation using its own internal math engine. What I have found is that Hadamard deviation is a lot more useful for screening oscillators, but all you get with the 53230 is Allan. If you're reading time-nuts, you can probably figure out how to calculate the DEV du jour. (There are actually many flavors, as we know). Given the price of the 53230A, I just don't see a value proposition there. Rick N6RK