Test and measurement equipment (T&ME) must be periodically calibrated to ensure it’s operating within its specified parameters. Of course, the uncertainty of the system used to calibrate the equipment shouldn’t add appreciable error to this process.Test and measurement equipment (T&ME) must be periodically calibrated to ensure it’s operating within its specified parameters. And, of course, the uncertainty of the system used to calibrate the equipment shouldn’t add appreciable error to this processThe calibration process usually involves comparison of the T&ME to a standard that has similar functions with better accuracies. The comparison between the accuracy of the unit under test (UUT) and the accuracy of the standard is known as test accuracy ratio (TAR). However, this ratio doesn’t consider other potential sources of error in the calibration process.

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