Span Offset is the amount of deviation in output or reading from the exact value at a point within the measurement span.
Manufacturers may include a factory setting tolerance for the span offset on the product technical data sheet to help users determine the total error to be expected without any calibration adjustment.
For example a pressure transducer for measuring 0 to 15 psi pressure with a 0 to 30 mV output may have a span offset tolerance of +/-0.1% span. Therefore at 7.5 psi the maximum span setting tolerance will be +/- 0.015 mV.
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