Tektronix TPS2012B, User Manual

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Reference
Key Points Persistence.
The oscilloscope displays persistence waveform data with less
intensity than "live" waveform data. With Persistence set to In fi nite, record points
accumulate until a control is changed.
Option Comments
Off Removes default or old waveforms whenever new waveforms
display
Time limit Displays new waveforms at normal intensity and old waveforms
at a lower intensity; erases old waveforms when they reach
the time limit
In fi nite Older waveforms become less bright but always remain visible;
use In
fi nite persistence to look for infrequent events and to
measure long term peak-to-peak noise
XY Format.
Use the XY format to analyze phase differences, such as those
represented by Lissajous patterns. The format plots the voltage on channel 1
against the voltage on channel 2, where channel 1 is the horizontal axis and
channel 2 is the vertical axis. The oscilloscope uses the untriggered Sample
acquisition mode and displays data as dots. The sampling rate is
fi xed at 1 MS/s.
NOTE.
The oscilloscope can capture a waveform in normal YT mode at any
sampling rate. You can view the same waveform in XY mode. To do so, stop the
acquisition and change the display format to XY.
In XY format, the controls operate as follows:
The channel 1 Vertical Scale and Position controls set the horizontal scale
(volts/div) and position.
The channel 2 Vertical Scale and Position controls continue to set vertical
scale (volts/div) and position.
The following functions do not work in XY display format:
Autoset (resets display format to YT)
Autorange
Automatic measurements
Cursors
Reference or Math waveforms
Save/Recall ► Save All
Time base controls
Trigger controls
TPS2000B Series Digital Oscilloscope User Manual 103