An important part of performing instrument calibration is determining the extent of an instrument’s error. Error is usually measured in percent of span.
Calculate the percent of span error for each of the following examples, and be sure to note the sign of the error (positive or negative):
Question 1:
LRV = 0 PSI
URV = 100 PSI
Test pressure = 65 PSI
Instrument indication = 67 PSI
Question 2:
LRV = 0 pounds
URV = 40,000 pounds
Test weight = 10,000 pounds
Instrument indication = 9,995 pounds
Question 3:
LRV = -40 o F
URV = 250 o F
Test temperature = 70 o F
Instrument indication = 68 o F
Question 4:
LRV = 4 pH
URV = 10 pH
Test buffer solution = 7.04 pH
Instrument indication = 7.13 pH
Answer 1
Error = +2 % of span
Answer 2
Error = -0.0125 % of span
Answer 3
Error = -0.69 % of span
Answer 4
Error = +1.5 % of span
Credits: Tony R. Kuphaldt
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