[time-nuts] Traceable to NIST...??
gbusg at comcast.net
Mon Jun 28 17:36:45 EDT 2010
Here's a newer article by Michael Lombardi:
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.
----- 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....
What say the list?
> Today’s communication devices and protocols often require
> an accurate timebase. Leveraging the best technology of
> yesterday and today, we are proud to bring you the world's
> first rubidium GPSDO under $500! The LPRO-101 by Efratom®
> /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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