The simplest calibration procedure for a linear instrument is the so-called zero-and-span method.
The method is as follows:1. Apply the lower-range value stimulus to the instrument, wait for it to stabilize2. Move the \zero" adjustment until the instrument registers accurately at this point3. Apply the upper-range value stimulus to the instrument, wait for it to stabilize4. Move the \span" adjustment until the instrument registers accurately at this point5. Repeat steps 1 through 4 as necessary to achieve good accuracy at both ends of the range
An improvement over this crude procedure is to check the instrument's response at several points between the lower- and upper-range values. A common example of this is the so-called -ve-point calib...
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