Operation
Trigger Slope
Press SLOPE to select the rising
(+)
or falling
(-)
edge of the signal
to
trigger the sweep.
Trigger Level
INIT@50% sets the trigger level near the midpoint between signal peaks,
in
any mode. Some signals below
50
Hz
may not produce the correct level setting.
LEVEL gives you complete freedom to choose the most appropriate
threshold voltage
on
a signal to initiate sweeps,
in
case neither the Auto Lvi
mode nor
INIT@50% provides a suitable threshold.
Trigger Holdoff
With irregular signals such as bursts, the Trigger HOLDOFF setting can
improve
display stability. Also, if the signal has a fixed pattern of variation from
cycle to cycle, some modes of the signal may
be
omitted from the display.
Changing the Holdoff setting can force the instrument
to
display
all
the modes
of the
signal. Normally, HOLDOFF should be set at MIN.
Video Triggering
The available Television/Video (TV) enhancement adds TV LINES, FLD1, and FLD2
Coupling to the A-Trigger. See Appendix A to change the line-number format and the
sync
polarity automatically selected when you select TV triggering.
To trigger at the video
line rate:
1.
Select a composite video signal
as
the trigger source.
2.
Select LINES coupling.
3.
Set SLOPE
to
the polarity of the sync.
2-6
2465A/2455A/2445A Operators
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