[time-nuts] Re: Can ADEV of a frequency source be correctly determined using a continuous time-stamping frequency counter?

[Magnus Danielson]

Hi,

I strongly recommend the HP AN200 series of application notes. Having 
those alongside Enricos slides is a good start for those new in the field.

There is one variant of averaging which is used in the HP5328A/B 
counters that is described there that is not covered in Enrico Rubiolas 
otherwise excellent set of slides.

A more updated version exist in the Rohde, Rubiola, Whitaker "Microwave 
and Wireless Syntesizers" book. The PDEV was not published in 2012, but 
came in 2014. PDEV is now included in the IEEE 1139 draft, going through 
the voting process.

Many modern counters have used the method of charging a capactor and 
then read that charge out either as a pulse (Nutt interpolator) or 
through A/D conversion such as SR-620, Pendulum/Fluke CNT-80/81/90/91 
and Wavecrest DTS and SIAs. Modern FPGA based tapped delay was used 
already in HP5371A but is now used in FPGA and ASIC for higher 
resolution and is for sure comming along strong in commercial and 
academic counters.

Cheers,
Magnus

On 2021-11-11 16:02, Erik Kaashoek wrote:
> Lewis
> The interesting source you referred to contained a slide deck which 
> turned out to be a gold mine for a novice like me.
> http://rubiola.org/pdf-slides/2012T-IFCS-Counters.pdf
> This should be on leapsecond
> Many thanks!!!!
> Erik.
>
> On 10-11-2021 19:36, Lewis Masters wrote:
>> Hi,
>>
>>
>> Anders Wallin has details of a commercially available time stamping 
>> counter
>> that will do a proper ADEV measurement.  He also includes links to other
>> interesting sources.
>>
>>
>> Search for:
>>
>> CONT vs RCON mode on the 53230A frequency counter
>> <http://www.anderswallin.net/2015/06/cont-vs-rcon-mode-on-the-53230a-frequen 
>>
>> cy-counter/> - anderswallin.net
>>
>> 1604.05076.pdf (arxiv.org) <https://arxiv.org/pdf/1604.05076.pdf>
>>
>>
>> Lew
>>
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