Tektronix CSA8000B - Manual (Page 149)

Measuring Waveforms
CSA8000B & TDS8000B User Manual 3- 75
Annotations indicate the waveform
region determining measurement
Figure 3- 19: Measurement annotations on a waveform
Use Databases as Sources. If you define the source you want to measure as a
database in the Meas Setup dialog box, you can use the database of that
waveform as source. The measurement you select operates on the accumulated
waveform data (databases accumulate repetitive instances of a source waveform
over time).
For example, consider the Max measurement. Max will capture and update the
maximum (most positive) value encountered. For a database source, the ongoing
Max measurements can only result in a higher max value as the database
accumulates ongoing acquisitions. This process causes the Max measurement
readout to track max up but not down. In contrast, the Max measurement for a
waveform source not included in a database will track variation up and down as
new waveforms are acquired.
Characterize Measurements Independently. To allow you control over how your
waveform data is characterized by each measurement, the instrument lets you set
the methods used independently for each measurement. See High/Low Tracking
Method on page 3--77 and Reference Levels Method on page 3--79.
See Statistics on Measurement Results. To see how any automatic measurement
varies statistically, you can display a readout of the Min, Max, Mean, and
Standard Deviation the measurement results. See step 6 on page 3--81 for
instructions. See also the following topic for information about questionable
measurements.