Agilent Technologies InfiniiVision DSO6014L, Руководство пользователя

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Triggering the Oscilloscope 4
6000 Series Oscilloscope User’s Guide 197
As you press the
D+
or
D–
softkey (or rotate the Entry knob
on mixed-signal oscilloscopes), the D+
and
D– label for the
source channel is automatically set and the channel you
select is shown in the upper-right corner of the display next
to “
USB ”.
Adjust the trigger level for the selected analog channel by
turning the Trigger Level knob. Press the
D15 Thru D0 key and
select Thresholds to set the threshold level for digital
channels. The value of the trigger level or digital threshold is
displayed in the upper-right corner of the display.
4 Press the Trigger: softkey to select where the USB trigger will
occur:
• SOP (Start of Packet) — triggers at the Sync bit at the
beginning of the packet.
• EOP (End of Packet) — triggers at the end of the SE0
portion of the EOP.
• RC (Reset Complete) — triggers when SE0 is > 10 ms.
• Suspend (Enter Suspend) — triggers when the bus is idle
> 3 ms.
• Exit Sus (Exit Suspend) — triggers when exiting an idle
state > 10 ms. This is used to see the suspend/resume
transition.
D+,–
D–,+
Bus Idle
SOP
SE0 portion of EOP
End of packet trigger