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Chapter 5 To Trigger the Oscilloscope
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. Below is the USB data transmission protocol diagram.
Figure 5-16 USB data transmission protocol diagram
Trigger Type:
Press Type to open the trigger type list. Rotate
"USB". At this point, the trigger setting information is displayed at the upper right
corner of the screen. For example,
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 or CH2. 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.
DS2000E User's Guide
and press down
. The trigger type is USB trigger;
RIGOL
to select
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