ALT
®
A/B
TRIG (or
A/B/MENU)
Button
LEVEL
Control
Controls, Connectors,
and
Indicators
The A Sweep alternately triggers on the same
selected line
in
both TV fields. Both the FLD 1 and
the FLD 2 indicators
light. NORM trigger mode
is
automatically selected.
With CHOP vertical mode, all channels are displayed
with both the FLD 1 and the FLD 2 triggers.
With
Alt vertical mode and more than one channel
displayed, field
1 of the video signal triggers the
sweep with the first
displayed channel and field 2
triggers the sweep with the next
displayed channel.
With more than two channels, each additional
channel
is displayed with triggers from both fields.
The MODE, SOURCE, COUPLING, SLOPE, LEVEL,
and
INIT@50% controls are normally directed to the
A Trigger. They are directed
to
the B Trigger with Inten,
Alt,
or
B-Sweep horizontal displays, if B mode is TRIG
AFT DL Y (or, with the CIT, TRIG
!:1
DL
V).
The trigger
controls are directed
to
the opposite trigger while the
A/B
TRIG (or, with the CIT, A/B/MENU) button
is
pressed. With Inten, Alt,
or
B-Sweep horizontal displays,
and with B-Trigger mode set
to
RUN AFT DL Y or with
A-Trigger mode set to
Sgl Seq, the trigger controls are
alternately directed
to
the A Trigger
or
to
the B Trigger
each time the button
is
pushed.
Sets the
amplitude
pOint
on
the triggering signal at
which A-Sweep
or
B-Sweep triggering occurs.
When the A-Trigger mode is set
to
Auto Lvi, the effect
of the LEVEL
control
is
spread over the peak to peak
amplitude of the triggering signal. When the control
is
rotated to either extreme, the peak values are
measured, and the
control range
is
redefined
to
correspond
to
the peak values. If LEVEL is fully
clockwise,
the initial level
is
near the positive peak. If
LEVEL is fully counterclockwise, the initial level is near
the negative peak.
2465A/2455A/2445A Operators
5-23
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