Chapter 5 Trigger RIGOL
MSO4000/DS4000 User’s Guide 5-53
USB Trigger
MSO4000/DS4000 can trigger on a Start of Packet (SOP), End of Packet (EOP), Reset
Complete (RC), Enter Suspend (Suspend) or Exit Suspend (ExitSuspend) of the
differential USB data lines (D+ and D-).
This trigger supports USB low speed and full speed. The figure below shows the USB
data transmission protocol.
Figure 5-8 USB Data Transmission Protocol
Press MENU (in the trigger control area (TRIGGER) at the front panel) Type, turn
the multi-function knob to select “USB” and press the knob. You can also press
Type continuously to switch to “USB” trigger.
At this point, the trigger setting information (include the trigger type, trigger source
and trigger level/threshold level, as shown in the figure below) is displayed at the
upper-right side of the screen and changes with the trigger setting.
Set the USB trigger:
1. Specify the D+ signal source and adjust the trigger level/threshold
level
1) Press D+ to select CH1 to CH4 or D0 to D15 (please refer to “Trigger
Source”). The signal source currently selected is displayed at the
upper-right side of the screen.
Note: Channels that are turned off can also be selected as the D+ and D-
signal source.
2) Turn TRIGGER
LEVEL to adjust the trigger level (when the trigger
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