Performing Limit Testing

After you define the mask, you acquire a signal using a DAQ device. The sample rate is set at 1/dx S/s. Compare the signal with the limit. For the upper limit, if the data point is less than or equal to the limit point, the test passes. If the data point is greater than the limit point, the test fails. For the lower limit, if the data point is greater than or equal to the limit point, the test passes. If the data point is less than the limit point, the test fails.

The following figure shows the result of limit testing in a continuous mask case. The test signal falls within the mask at all the points it is sampled, other than points b and c. Thus, the limit test fails. Point d is not tested because it falls outside the mask.

The following figure shows the result of limit testing in a segmented mask case. All the points fall within the mask. Points b and c are not tested because the mask is undefined at those points. Thus, the limit test passes. Point d is not tested because it falls outside the mask.