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On Sun, 2005-05-22 at 21:47, Jim Adney wrote: > On 20 May 2005 at 21:00, Toby Erkson wrote: > > > Yup, that's why I bought what I bought. And the accuracy of the middle > > range is +/- 0.6psi which is 2% of 30psi...or should it be measured as > > 2% of 60psi? > > Electrical meters are rated at a percentage of the full scale pressure. I > THOUGHT pressure gauges were rated the same. That's why I've always suggested > that people buy a 30 psi gauge. > > We should be able to get a definitive answer from some manufacturer's web site. All gages are most linear in the middle of their range. Whether it is a transducer, or a mechanical. For calibration purposes, we set our in middle of range. Most of our work is done in the 40-60 psi range, so we calibrate them with linear regression in our PLC's -- Russ Wolfe '71 FB AT '66 FB MT '64 T34 (not running) '65 T1 (not running) '05 KIA Sorento SUV russw@classicvw.org http://www.classicvw.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~