[time-nuts] Best counter setting for ADEV?

Said Jackson saidjack at aol.com
Tue Oct 2 13:27:58 UTC 2012


Hi Luciano,

Have a bunch of 53132as too, nice and small and convenient for frequency measurements.

In the absence of Johns' Timepod, or if you need to measure >30MHz then I think the DTS are the best bang for the buck..

From there, its either 3048a or TSC5110... But those are $$$

Said


On Oct 2, 2012, at 6:06, Timeok <timeok at timeok.it> wrote:

> Hi Said,
> I have bought the HP53132A from HP several years ago when WWW and ebay was not invented! hi!
> I agree with you about the wavecrest
> luciano
> 
> Il 2012-10-02 14:40 Said Jackson ha scritto:
>> Luciano,
>> 
>> For TI mode, I have recommended the Wavecrest DTS time interval
>> counters here in the past.
>> 
>> Can be 1/2 price of an HP 53132A ($600 or so) on ebay, has 800
>> femtoseconds resolution, and around 3ps SD typically. Goes to 800Mhz
>> or twice that depending on model. That blows the 53132A out of the
>> water.
>> 
>> Useless in frequency mode though, one must calculate frequency by
>> fast time interval measurement on the 10MHz for example using Stable
>> 32 etc.
>> 
>> Heavy, large, and power hungry, but quite solid.
>> 
>> Said
>> 
>> 
>> 
>> On Oct 2, 2012, at 4:29, Timeok <timeok at timeok.it> wrote:
>> 
>>> test using HP53123A:
>>> The pink line is the noise floor using the TI mode
>>> The blue line is the noise floor using the Frequency mode (gate 2 sec)
>>> The other two line are the same oscillator, an HP105B tested with both the modes.
>>> As you can see the range between 1 and 200 sec is "totally
>>> compromised" by the system noise floor using the TI method.
>>> The approximation using the freq mode can be anyway usefull to make a
>>> comparatinon between two source.
>>> I suppose to have right measurements, without any restriction we have
>>> to use the Timepod or other high level instruments than this kind of
>>> counters.
>>> 
>>> Luciano
>>> <TIvs Freq mode1.jpg>
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> 
> -- 
> timeok
> 
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