Agilent Technologies InfiniiVision 5000 Series User Manual page 68

2
Initial Setup
68
To specify the measurement window for Zoom mode
is displayed, you can specify whether the upper, Main window or the lower, Zoom
window is used as the measurement window.
1 Press [Utility] > Options > Preferences > More.
2 Press Window to select from these measurement window options:
• Auto Select – The measurement is attempted in the lower, Zoom window; if it
cannot be made there, the upper, Main window is used.
• Main – The measurement window is the upper, Main window.
• Zoom – The measurement window is the lower, Zoom window.
For information about using zoom mode for measurements, refer to
"Measurements and Math Functions," starting on page 191.
Roll mode
• Press the [Menu/Zoom] key (or [Main/Delayed] key on some oscilloscopes), then
press the XY or Roll softkey to select "Roll".
• Roll mode causes the waveform to move slowly across the screen from right to left. It
only operates on time base settings of 500 ms/div and slower. If the current time base
setting is faster than the 500 ms/div limit, it will be set to 500 ms/div when Roll mode
is entered.
• In Normal horizontal mode, signal events occurring before the trigger are plotted to
the left of the trigger point (t) and signal events after the trigger plotted to the right of
the trigger point.
• In Roll mode there is no trigger. The fixed reference point on the screen is the right
edge of the screen and refers to the current moment in time. Events that have
occurred are scrolled to the left of the reference point. Since there is no trigger, no
pre-trigger information is available.
If you would like to pause the display in Roll mode press the [Single] key. To clear the
display and restart an acquisition in Roll mode, press the [Single] key again.
Use Roll mode on low-frequency waveforms to yield a display much like a strip chart
recorder. It allows the waveform to roll across the display.
When the zoomed time base
Chapter
InfiniiVision Oscilloscopes User's Guide
6,