Reference
Options Settings Comments
RefA, RefB, RefC
1
,RefD
1
On, Off
Displays or re
moves
reference memory
waveforms from the screen
1
Available only on a 4-channel oscilloscope.
Key Points
Saving and Recalling Setups. The complete setup is stored in nonvolatile memory.
When you recall the setup, the oscilloscope will be in the mode from which the
setup was saved.
The oscilloscope saves the current setup if you wait three seconds after the last
change before you power off the oscilloscope. The oscilloscope then recalls this
setup the next time you apply power.
Recalling the Default Setup. You can push the Default Setup button to initialize
the oscilloscope to a known setup. To view option and control settings that the
oscilloscope recalls when you push this button, refer to Appendix E: Default Setup.
Saving and R ecalling Waveforms. The oscilloscope must display any waveform
that you want to save. Two-channel oscilloscopes can store two reference
waveforms in internal nonvolatile memory. Four-channel oscilloscopes can store
four, but only display two at a time.
The oscilloscope can display both reference waveforms and channel waveform
acquisitions. Reference waveforms are not adjustable, but the oscilloscope
displays the horizontal and vertical scales at the bottom of the screen.
Trigger Controls
You c an define the trigger through the Trigger Menu and front-panel controls.
Trigg er Types
Three types of triggering are available: Edge, Video, and Pulse Width. A different
set of options display for each type of trigger.
Option Details
Edge (default) Triggers the oscilloscope on the rising or falling edge of the input
signal when it crosses the trigger level (threshold)
Video
Displays NTSC or PAL/SECAM standard composite video
waveforms; you trigger on fields or lines of video signals. (See
page 115, Video Trigger.)
Pulse
Triggers on aberrant pulses. (See page 115, Pulse Width Trigger.)
Edge Trigger
Use Edge triggering to trigger on the edge of the oscilloscope input signal at the
trigger threshold.
112 TPS2000B Series Digital Oscilloscope User Manual
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