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• Left: when the horizontal time base is modified, the waveform will be expanded
or compressed horizontally relative to the leftmost position of the display.
• Right: when the horizontal time base is modified, the waveform will be
expanded or compressed horizontally relative to the rightmost position of the
display.
• Trigger: when the horizontal time base is modified, the waveform will be
expanded or compressed horizontally relative to the trigger point.
• User: when the horizontal time base is modified, the waveform will be expanded
or compressed horizontally relative to the user-defined reference position.
When you select "User", click or tap the User Expansion input field and set the
value with the displayed numeric keypad. Its range is from -500 to 500, and the
default is 0.
7.6 Roll Mode
The roll mode causes the waveform to move across the screen from right to left. It
allows you to view the acquired data without waiting for a complete acquisition. In
Horizontal menu, select "Auto" or "OFF" in Roll.
• Auto: the Roll mode is enabled. It is automatically enabled when the horizontal
scale is 50 ms/div or slower.
• OFF: the Roll mode is disabled. The oscilloscope operates at slow sweep speeds
when the horizontal scale is 200 ms/div or slower. In slow sweep mode, the
oscilloscope acquires the data to the left of the trigger point and then waits for
trigger. After the trigger occurs, it continues to acquire the data to the right of
the trigger point. When you use this mode to observe low-frequency signals, it is
recommended to set the channel coupling mode (
To Specify Channel Coupling
)
to "DC".
TIP
• If the Zoom mode is currently turned on, enabling the roll mode automatically turns off
the Zoom mode.
• The following functions are not available when the roll mode is enabled:
To Adjust the Horizontal Position
(available when the oscilloscope run state is STOP),
Zoom Mode (Delayed Sweep)
,
Triggering the Oscilloscope
,
Protocol Decoding
,
Pass/Fail
Test
,
Waveform Recording and Playing
,
Persistence Time
,
UltraAcquire
,
Average
,
XY
Mode
,
Search
.
7.7 XY Mode
By default, this series oscilloscope uses the YT mode for waveform display window. In
YT mode, Y-axis indicates the Voltage and X-axis indicates the Time. Besides, it also
Acquisition System
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved. DHO800 User Guide
57
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