[time-nuts] Traceability after loss of LORAN and WWVB

[Bob Camp]

Hi

On Jun 1, 2013, at 11:40 AM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> On 06/01/2013 04:54 PM, Bob Camp wrote:
>> Hi
>> 
>> At least the way I read the pdf's NIST seems to believe that GPS is legally traceable to NIST. It is the same "measure and then look up the data" sort of thing that LORAN used to be.  Took a while to read through them all…
> 
> However, just taking time from GPS does not achieve NIST traceability.
> The NIST folks will point it out too.
> 
> You can achieve NIST traceability (or to any other NIH) if you do a whole bunch of things _right_ and in accordance with relevant standards. Few do.
> 
In the context of the original post - exactly the same was true of LORAN. To actually achieve traceability you needed to do this and that once you had your "observations". In reality the same is true of WWVB and WWV. None of them achieve traceability in the strict sense simply from the observation of their frequency or time.

Bob

> Cheers,
> Magnus
> 
>> Bob
>> 
>> On May 31, 2013, at 4:37 PM, Charles P. Steinmetz<charles_steinmetz at lavabit.com>  wrote:
>> 
>>> Scott wrote:
>>> 
>>>> How are those of you dealing with traceability in the commercial space
>>> 
>>> The topic is known as "legal metrology."  Start here:
>>> 
>>> <http://www.nist.gov/traceability/nist_traceability_policy_external.cfm>
>>> 
>>> You need to click through lots of links to get the whole picture.  I believe the material is printed in the NIST Administrative Manual.
>>> 
>>> Other potentially helpful links:
>>> 
>>> <http://tf.nist.gov/general/pdf/2289.pdf>
>>> 
>>> <http://tf.nist.gov/seminars/2002%20NIST%20Seminar%20-%20Traceability%20and%20Legal%20Metrology.ppt>
>>> 
>>> <http://www.icllabs.com/pdfs/A2LA_P102%20Policy%20on%20Measurement%20Traceability.pdf>
>>> 
>>> <http://tf.nist.gov/general/pdf/1305.pdf>
>>> 
>>> 
>>> Best regards,
>>> 
>>> Charles
>>> 
>>> 
>>> 
>>> 
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