Preparation for Us
e-22
15A Operators
21POSITION
Control-H
orizontally positions both the A
Sweep and the B Sweep displays and horizontally
po
-
sitions X-axis in the X-Y mode.
22HORIZONTAL MODE
Switch-
Three-position switch
determines the mode
of
operation for the horizontal
deflection system.
A-Hor
izontal deflection is provided by the A
Sweep generator at a sweep speed determined by
the A SEC/DIV switch setting.
ALT
-Alternates
the horizontal displays between
the A Sweep (with
an
intensified zone) and the B
Delayed Sweep. The A Sweep speed is
de
termined
by the setting
of
the A SEC/DIV switch. The B
Sweep speed and the length
of
the intensified zone
on
the A Sweep are both determined by the B
SEC/DIV switch setting.
B
-Horizontal
deflection is provided by the B
Sweep generator at a sweep speed determined by
the B SEC/
DIV
switch setting. The start
of
the B
Sweep is delayed from the start
of
the A Sweep by
a time determined by the settings
of
both the A
SEC
/DIV switch
and
the B
DELAY
TIME POSI-
TION control.
23A/B SWP
SEP
Control-Vertically
positions the B
Sweep trace with respect
to
the A Sweep trace when
ALT HORIZONTAL MODE is selected.
24B DELAY TIME POSITION
Control-Selects
the
amount
of
delay time between the start
of
the A
Sweep and the start
of
the B Sweep. Delay time is
variable from 0.5 times
to
1 O times the A SEC/DIV
switch setting.
TRIGGER
Refer
to
2-6 for location
of
items 25 through 34.
25
2-6
A TRIGGER Mode Switches- Three section
sw
itch
th
at
determines the trigger mode for the A Sweep.
P-P AUTO-TV LINE
-Perm
i
ts
triggering
on
wave-
forms
and
division lines hav
in
g repetition rates
of
at
least 20 Hz. Sweep free-runs
in
the absence of
an
adequate trigger signal
or
when the repetition
rate is bel
ow
20
Hz.
The range
of
the A TRIGGER
LEVEL control is restricted
to
the peak-to-peak
range
of
the trigger signal.
NORM
-Sweep
is initiated when
an
adequate trig-
ger signal is appl
ied.
In
the absence
of
a trigger
signal, no baseline trace will be present.
TV
FIELD-
Press in both P-P AUTO and NORM
buttons. Permits
tr
iggering on television field sig-
nals. TRIGGER LEVEL control should be rotated
fully counterclockwise when triggering on
TV
sig-
nals with negative going sync and clockwise for
positive going sync.
SGL
SW
P RESET
-Press
in the spring-return but-
ton momentarily
to
arm the A Trigger circuit for a
single-sweep display. In this mode, the trigger sys-
tem operates the same as NORM, except only one
sweep is displayed for each trigger signal. Another
sweep cannot be displayed until the SGL SWP
RESET button is momentarily pressed
in
again
to
reset the A Trigger circuit. This mode is useful for
displaying and photographing either nonrepetitive
signals
or
signals that cause unstable conventional
displays (e.g., signals that vary in amplitude,
shape,
or
time).
26TRIG'D-READY Indicator
-LED
illuminates when
ei
-
ther P-P AUTO
or
NORM Trigger Mode is selected
and the A Sweep has been
tr
iggered (TRIG'
D).
In
s
in
gle-sweep display, the LED
ill
uminates
to
indi-
cate that the A Trigger circuit is armed (READY).
27A TRIGGER LEVEL Control
-Selects
th
e amplitude
point on the trigger signal
at
which the sweep is
triggered.
4732-06
Figure 2-6. Trigger controls, connector, and indicator.
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