Protection
Accuracy
SKF Multilog On-Line System IMx-M
2 - 3
User Manual
Accuracy is Relative to API 670 Defined Full Scale
Example:
For an amplitude accuracy of 2 %
API 670 defined full scale: Axial position ±1 mm => Accuracy = ±20
m
Incorrect:
Measured value = 52 µm
Input signal = 50 µm
Error = Measured value
–
Actual value = 52 - 50 µm = 2 µm
Error in % = Error / Input signal => 2 / 50 => 4% error
Incorrect:
Measured value = 0.01 µm
Input signal = 0 µm
Error = Measured value
–
Actual value = 0.01 - 0 µm = 0.01 µm
Error in % = Error / Input signal => 0.01 / 0 => Infinite
Correct:
Error = Measured value
–
Actual value = 52 - 50 µm = 2 µm
Error in % = Error / API 670 Full scale = 2 / 1000 => 0.2% error
