Reference
Key Po ints
Persistence. T
he 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 Comments
Off Removes def
ault 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
thetimeli
mit
Infinite Older wave
forms become less bright but always remain visible;
use Infinite persistence to look for i nfrequent events and to
measure long term peak-to-peak noise
XY Format. Use the XY format to analyze phase differences, such a s 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
acquis
ition mode and displays data as dots. The sampling rate is fixed at 1 MS/s.
NOTE. The oscilloscope can capture a waveform in normal YT mode at any
sampling rate. You can view the s ame 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:
A
utoset (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
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