Hi Jay,
Yeah it looks crazy doesn't it? And you had me onto my back foot for a while :)
However according to the conventions and definitions used by industry.
Reference Accuracy: A number or quantity which defines the limit that errors
will not exceed when the device is used under reference operating conditions.
Reference accuracy can be expressed in a number of forms
1 Reference accuracy expressed in terms of the measured variable
ie the reference accuracy is ±1°F
etc etc......
Process Instruments and Controls Handbook, Considine, McGrawHill
What it means is that all your tests results will be within ±x% of the
actual true value. So if you have an instrument which quotes accuracy ±1%
of reading. The way I see it is that if your CS is actually 10.0ppm the
instrument is going to indicate anywhere within 9.90 and 10.10. If you made
several readings, one after the other, each one would be slightly different
but in the quoted range.
OK,
Tony
Jay Ice wrote:
That's good? but doesn't that mean 99.5% of my tests will be wrong? I'm not
sure that's a good thing. I think I would much rather something much much
much much accurate.:) Thanks.
Ice
That works out to 0.5% accuracy at
fullscale, which is quite good for a cheap instrument.
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