Hi Tom,
My experience is the manufacturer's, of hp or fluke quality, reported
error band (their spec sheet) is the worst case (or at least 3 sigma)
provided that the device is operated according to the recommended
environment, etc.
Nonetheless, my statement you quoted is still accurate as to the purpose
of the specification. Although I probably should have qualified a bit
more. It goes without saying that one should be careful when it comes
to specmanship no matter who it is.
Bill....WB6BNQ
Tom Van Baak wrote:
The value of 5E^-11 refers to the resolution that the precision can be
relied upon after taking into account all the factors that influence
it. It means that there is an error that can be as much as +/-5 parts
per e^-11.
No, it can be way more. A 5e-11 spec value is likely just RMS, or 1-sigma.
Actual measurements will show significantly larger 2-sigma, 3-sigma, etc. value.
Your "as much as" wording sounds more like a 6-sigma, or peak-to-peak spec.
One must be very careful to match the measurement used to make the spec with
how the device is intended to be used. For example, Magnus will likely tell us
about MTIE, which is a perfect-storm, worst-case time error spec. It's very
different from rough 1-sigma specs we usually talk about.
/tvb
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