Agilent Technologies XX3625 Service Manual page 57

Figure 3-12
Measurement Settings for Time Interval Measurement
For valid statistical data
In equivalent time mode, measurement specifications are valid with sixteen or more acquisitions averaged.
Statistics accumulated before the required number of averaged acquisitions may show the instrument to
fail the specification. This is particularly true for minimum and maximum in this case since they are set by
measurements taken with the fewest averages.
If the procedure above is followed exactly, the required number of acquisitions are averaged before
statistics are turned on. Therefore, if you clear and restart measurements, averaging and statistics are
restarted simultaneously and the result is erroneous data collected from the early averages.
If in doubt about the statistical data, after #Avg is complete select Clear Measurements or Clear All from
the Measure menu tool bar, then repeat the custom measurement again. This restarts the statistics without
restarting averaging and the result is valid statistical data.
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Chapter 3: Testing Performance
To test time measurement accuracy
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