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

[Greg Burnett]

According to these web sites, the GPSDO provides traceability to NIST:
http://www.nist.gov/physlab/div847/grp40/gpsarchive.cfm
http://tf.nist.gov/general/pdf/1305.pdf

As a "sanity" check, it would be prudent to periodically cross-check your 
GPSDO against a different frequency standard (e.g., cesium or WWVB or 
another version/brand GPSDO).

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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 > /Symmetricom®, stabilized by a high-sensitivity GPS system,
 > provides affordable, traceable precision. Watch our DEMO

* 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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