dc Errors
Time-interval measurements are referenced to the waveform crossing some
voltage threshold. Therefore, any dc level errors cause errors in locating the
times of features on the signal.
•
Offset errors constant error
•
Gain errors in the magnitude of the average slope of the transfer function
•
Linearity error variations in the slope of the transfer function
•
Random errors that can’t be repeated from measurement to measurement.
Figure 13-13 shows how vertical dc errors affect time-interval accuracy. The
linearity of the HP 54720 is typically better than 1/2 LSB, so the error is
dominated by the offset and gain errors.
Effect of Vertical dc Errors on Measurement Accuracy
Figure 13–13
Measurements
Time-interval measurements
13–31
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