Roll Mode; Xy Mode - Rigol DHO924S User Manual

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DHO900 User Guide
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• 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.

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. The slow sweep mode is not
available for digital channels. 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 (
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
Zoom Mode (Delayed Sweep)
Test Waveform Recording and Playing
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Mode Search Digital Channel
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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
supports the XY display in which both X-axis and Y-axis indicate voltage. The XY
mode converts the oscilloscope from a "Voltage-Time" display to a "Voltage-Voltage"
display using two input channels.
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To Specify Channel Coupling
(available when the oscilloscope run state is STOP),
Triggering the Oscilloscope
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Persistence Time
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Protocol Decoding Pass/Fail
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UltraAcquire Average XY
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