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• 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
.
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
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.
Enable the XY Mode
You can enable the XY display mode in the following ways.
• Click or tap the Windows button in the function navigation menu or on the
toolbar to enter the Add Window menu. In the "Diagram" item, click or tap XY >
Add to enable the XY display mode.
• Click or tap the XY button in the function navigation menu or on the toolbar to
enable the XY display mode.
• In the "Horizontal" menu, tick XY to enable the XY mode.
Configure the XY Mode
Click or tap
at the upper-right corner of the XY display window to enter the XY
configuration menu.
Acquisition System
DHO4000 User Guide
66
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
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