User Manual

Chapter 5 To Trigger the Oscilloscope RIGOL
MSO2000A/DS2000A User’s Guide 5-47
USB Trigger (Option)
Trigger on the SOP, EOP, RC, Suspend and Exit Suspend of the data packet on the
differential USB data cable (D+ and D-). This trigger supports USB Low Speed and
Full Speed. The figure below shows the USB data transmission protocol.
Figure 5-16 USB Trigger
Trigger Type:
Press Type to open the trigger type list. Rotate and press down to select
“USB”. At this point, the trigger setting information as shown in the figure below is
displayed at the upper right corner of the screen. For example,
.
The trigger type is USB trigger; the trigger source is CH1; the trigger level is 0.00 V.
Source Selection:
Press D+ and D- to specify data sources for D+ and D- data cables respectively.
They can be set to CH1, CH2 or any channel of D0-D15. For the details, please refer
to the introduction in “
Trigger Source”. The current trigger source is displayed at
the upper right corner of the screen.
Note: Select channel with signal input as trigger source to obtain stable trigger.
Signal Speed:
Press Speed to select “Low Speed” (1.5 Mb/s) or “Full Speed” (12 Mb/s).
Trigger Condition:
Press When to select the desired trigger condition.
 SOP: trigger at the sync bit at the start of the data packet (SOP).
 EOP: trigger at the end of the SEO portion of the EOP of the data packet.
 RC: trigger when SEO is greater than 10 ms.
 Suspend: trigger when the idle state of the bus is greater than 3 ms.