Standard set of terms for precision, accuracy, related concepts.

[Gary E. Miller]

Yo Ian!

On Tue, 25 Apr 2017 13:06:14 -0500
Ian Bruene <ianbruene at gmail.com> wrote:

> On 04/25/2017 12:08 PM, Achim Gratz wrote:
> > When talking about precise frequency measurements I would rather
> > expect ppt to refer to "parts per trillion".  
> 
> Useful note: the units display code shows parts-per-thousand as
> "ppk", parts-per-kilo in order to avoid this collision.

Can someone find a citation for best practice on parts-per-thousand?

Wikipedia says ppt is used in some disciplines for this.

https://en.wikipedia.org/wiki/Parts-per_notation

An unsatifying compromise is the  millage (‰) symbo

RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588

	    Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin
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