E-1
APPENDIX E
Q Measurement accuracy calculation
Q measurement accuracy for auto balancing bridge type instruments is not specified directly as ±%.
Q accuracy should be calculated using the following equation giving the possible Q value tolerance.
Where: Qt is the possible Q value tolerance
Qm is measured Q value
∆D is D measurement accuracy
For example, when the unknown device is measured by an instrument which has D measurement
accuracy of .001, and the displayed Q value is 200, the Q tolerance is calculated as:
This result means that the true Q value will be between 167 and 250.
Note: The following equation may be used to calculate the Q value tolerance. (The result is the same
at that from the above equation.)
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