What is Calibration?
Calibration is simply the process of comparing an unknown value to a known value. To calibrate a device is to compare the output of that device with the output of a similar but highly accurate device called a “standard”. Using load cells as an example, the load cell being calibrated (the unknown) and the standard load cell (the known) are mounted and a range of loads is applied. Because they are in series, both load cells experience identical loads and therefore the output values should also be identical. The calibration result is the difference between the two values, otherwise known as the measurement error.
Calibration is simply the process of comparing an unknown value to a known value. To calibrate a device is to compare the output of that device with the output of a similar but highly accurate device called a “standard”. Using load cells as an example, the load cell being calibrated (the unknown) and the standard load cell (the known) are mounted and a range of loads is applied. Because they are in series, both load cells experience identical loads and therefore the output values should also be identical. The calibration result is the difference between the two values, otherwise known as the measurement error.
What is Verification?
Verification is the subsequent evaluation of the calibration result against the expected performance specification for the equipment. The performance specification dictates the limits of the measurement errors for the device under test. If the measurement errors throughout the range are less than the specified limits, the device is verified as conforming to its performance specification. If the errors are greater than the specified limits, the device is verified as not conforming to its performance specification. Note that in either case, conforming or not conforming, the equipment is still considered to be verified.
What's a common misconception?
A common misconception is that calibration means adjusting the output of a device to bring its performance “within limits.” Any adjustment made to the output of the device is separate from the calibration and verification process, and must be followed by a further calibration and verification to prove the adjustment was successful.
Learn more about Calibration vs. Verification.
3 comments:
Information presented in this post made this post post worthy as it will enhance sources and methods use in this calibration process.
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