Tektronix TPS2000 Series User Manual page 195

2. Reference waveforms appear white and waveforms with
persistence applied appear in the same color as the Main
waveform, but with less intensity.
3. A broken line indicates the waveform display no longer matches
the controls. This happens when you stop the acquisition, and
change a control setting that the oscilloscope is not able to apply
to the displayed waveform. For example, changing the trigger
controls on a stopped acquisition causes a broken-line waveform.
Key Points
Persistence. The oscilloscope displays persistence waveform data
with less intensity than "live" waveform data. With Persistence set to
Infinite, record points accumulate until a control is changed.
Option
Off
Time limit
Infinite
TPS2000 Series Digital Oscilloscope User Manual
Comments
Removes default or old waveforms whenever new waveforms
display
Displays new waveforms at normal intensity and old waveforms
at a lower intensity; erases old waveforms when they reach the
time limit
Older waveforms become less bright but always remain visible;
use Infinite persistence to look for infrequent events and to
measure long term peak--to--peak noise
Reference
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