Answer / carl_ellis

WHAT IS A SYMPTOM OF FAULT WITH THE SPAN OF AN INSTRUMENT?
1)ZERO-POINT AND 100% ARE CORRECT BUT NOT A MID-RANGE.
2)ZERO-POINT IS CORRECT ,BUT 1005 INPUT IS NOT GIVING 100%
OUTPUT. 3)LINEARITY PRBS. 4)1005 O/p IS CORRECT BUT ZEO
POINT IS WRONG.

The correct answer is 2, but number 4 also requires a span
correction.

1) The "Zero-point and 100% are correct, but not a
mid-range value" problem is a linearity problem.

2) The "Zero-point is correct, but 100% input is not giving
100% output" is a span problem.

4) The "100% output is correct but zero point is wrong" is
a zero offset AND a span problem because when the zero point
is corrected with the addition of a bias/offset, the 100%
point will shift up or down the same amount as the zero
shifted with the bias/offset correction. So the 100% point
will no longer be correct once the zero is corrected.
Hence, the zero AND the span will need to be corrected.

Carl Ellis
Measure First

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