[time-nuts] Re: Phase Noise accreditation resources? Thanks

[Magnus Danielson]

Hi Tom,

I recommend you to talk to the Phase Noise section of the NIST Time and 
Frequency department, that is talk to Craig Nelson and Archita Hati. 
Among other things they build calibrators which is used to support the 
calibration for traceability. The NIST phase noise calibrations is 
documented in a nice document, so nice that we also refer to it from the 
updated IEEE Std 1139-2022. See here:

https://www.nist.gov/programs-projects/pmam-noise-calibration-services

See "Calibration uncertainty for the NIST PM/AM noise standard".

Accreditation in itself is a bunch of paperwork, and you can expect them 
to come over to inspect things in the process. Established routines on 
how to measure this or that needs to be documented and followed. So does 
althernative methods, so one should be a bit imaginative already in that 
phase.

You need to follow at least ISO/IEC 17025. Searching for accreditation 
in US resources turn up plentiful of resources. I suggest locating them 
and follow the thread. There is formal parts that needs to be achieved 
regardless of what you measure, and then there is the details for a 
"laboratory" and then further down you document the procedures and 
traceability of each measurement type you aim to do. Expect this 
paperwork and cost related to it be an effort and investment you have to 
do before you get "to the fun part" of phase noise measurements. 
However, once you achieved it and maintains it, addition of additional 
capabilities should be natural.

By the way, NPL has free online coarses in metrology and lately also in 
time and frequency. You get nice little certificat and all. How useful 
that is in this context I have not yet investigated, but at least it 
does not hurt.

Cheers,
Magnus

On 2023-03-23 23:54, Tom Knox via time-nuts wrote:
> I am attempting to find information needed for Phase Noise accreditation.
> I would be interested in any resources that would help understand and prepare for accreditation.
> I have years making Ultra Low Phase Noise Measurements but know little about formal accreditation.
> Thanks;
> Tom Knox
> SR Test and Measurement Engineer
> Phoenix Research
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