[time-nuts] Traceable to NIST...??

[Greg Burnett]

Here's a newer article by Michael Lombardi:
http://tf.nist.gov/general/pdf/2297.pdf

Note that a measurement uncertainty analysis is a required component of 
traceability. Therefore for the GPSDO to be traceable to NIST, someone 
(either the manufacturer or the user), must perform an uncertainty analysis.

Greg


----- Original Message ----- 
From: "Michael Baker" <mpb45 at clanbaker.org>
To: <time-nuts at febo.com>
Sent: Monday, June 28, 2010 2:57 PM
Subject: [time-nuts] Traceable to NIST...??


Hello, Time Nutters--

Traceable to NIST...? All you need is this LPRO Rb osc being
disciplined by a GPSDO and you can claim NIST traceability?

Not the way I understand the rules....

http://www.tenmhz.com/GPSDO.htm

What say the list?

Mike Baker
----------------------

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* Features: Guaranteed Accurate to < 5x10-11,
Traceable to NIST when LED is green

* Typical accuracy is even better → Typical Accuracy Charted
* Low phase noise 10 MHz, 50Ω BNC output at +7 dBm
* Includes power supply and high-gain GPS antenna
* Phase Locked for absolute accuracy over long time intervals

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