Operation
B-Trigger
Operation
Use the B Trigger to eliminate jitter in B-Sweep displays. With the available
Counter/Timer/Trigger
(CTT),
the B Trigger locks a delay-time or delta-delay-time
measurement to the signal, so any variations are tracked automatically. However,
without the
CTT,
the B Trigger obscures delay or delta-delay measurements and the
readout includes a question mark.
Distinguishing RUN
AFT
DL Y
and
TRIG
AFT
DL Y
With RUN AFT DLY mode, the A REF OR DLY POS and ^ controls adjust
the delay-time or delta-delay-time. The intensified zones on the A-Sweep trace
move continuously as the controls are adjusted. If the B-Trigger mode is TRIG
AFT DLY and a signal triggers the B Sweep, the delay times and intensified
zones jump to successive B-Trigger points as delay time is adjusted. With TRIG
AFT DLY, the actual delay time is controlled by the signal, as enabled by the
A Sweep and the A REF and A settings.
Setting
the B
Trigger
1.
When the B SWP indicator is on, press A/B TRIG to illuminate a
B-Trigger Mode indicator. (If B-Trigger mode is not RUN AFT DLY, a
B-Trigger Mode indicator will be on when the B SWP indicator is on.)
2.
Select TRIG AFT DLY Mode.
3. Set SOURCE, COUPLING, SLOPE, INIT@50%, and LEVEL controls
as required.
Changing
the A
Trigger while
B
Trigger is
Active
1.
Press and hold A/B TRIG while adjusting SOURCE, COUPLING,
SLOPE,
INIT@50%, and LEVEL controls for the A Trigger.
2.
Alternatively, choose RUN AFT DLY B-Trigger mode and momentarily
press A/B TRIG, then adjust A Trigger. With RUN AFT DLY B-Trigger
mode or SGL SEQ A-Trigger mode (or an active
CTT function
that uses
the B Trigger), the trigger controls alternate between A Trigger and
B Trigger each time A/B TRIG is momentarily pressed.
2-18
2465B/2455B/2445B Operators