23.
TRIGGER LEVEL - Determines amplitude of input
signal selected by TRIGGER SOURCE switch
(22)
that will
cause trigger circuits
to
operate. Scope will trigger
at
center
of
symmetrical waveform when set to zero position. The " +
,.
and
"-"
areas
indicate amplitude change only, not triggering
polarity.
2~.
TRIGGER POL
..
\RITY - Determines whether
trace
will
start
on positive
(+)
or
negative
(-)
transition
of
incoming
signal when TRIGGER
MODE
switch
(21)
is
in
NORM
or
AUTO
mode. When TRIGGER
MODE
switch
(21)
is
in
TV
position.
or
VIDEO PRESET BUTIO:-iS
(29
or
30)
are
used, polarity refers
to polarity
of
sync pulses:
"+"
for positivegoing sync and
,._.,
for negativegoing sync.
25. EXTERK-\L TRIGGER Input -
AlIov.'S
external trigger·
ingsignal
to
be injected when TRIGGER SOURCE switch
(22)
is
in
EXT position.
26.
GROUND
Jack.
2
•.
TI:\IEBASE-FREQ - Determines horizontal sweep rate.
Used
for determining frequency
or
time of displayed waveform
on
CRT when HORIZONTAL VERNIER
(28)
is rotated fully
clockwise.
Does not effect digital frequency measurements.
28. HORIZO:,\TAL VERSIER - Allows sweep speed to be
varied for special tests. Must be turned fully clockwise for cali-
brated time
or
frequency measurements on CRT. Does not
aJJect accuracy
oj
digital tests.
29.
VIDEO
HORIZ
- Displays two
or
more horizontal lines of
composite video information, depending on setting of
HORI-
ZOSTAL VERNIER
(28)
when TlMEBASE-FREQ switch
em
is
set
to
"Video
Preset"
position. Also automatically selects
video sync separators regardless of setting
of
TRIGGER
MODE
switch
(21).
30.
VIDEO VERT - Displays two more more vertical fields
of
composite video information. depending on selling of HORI·
ZO);'"TAL
VER:-:IER
(28)
when TIMEBASE·FREQ switch
(27)
is
set to "Video
Preset"
position. Also automatically selects
video sync
separators regardless of setting
of
TRIGGER
MODE
switch (21).
31.
HORIZ POS'/IOX EXPAND - Determines horizontal
position
of
trace, Pull knob
to
expand
trace
horizontally by a
factor
of
10.
32.
PROBE
CO:'l1P
- Provides a square wave signal for adjust-
ment
of
the
low
capacity scope probes to match the input ampli·
fiers.
33.
BE.UI
FISDER
-
Press
to locate position
of
traces.
When
this bunon is pressed, the vertical and horizontal gain is reduced
to display
the relative position of both channel A and B traces.
This button also bypasses the INTENSITY control
(41)
and the
triggeringcircuits to aid
in
locatingtrace.
7
Dlspla3'
Pushbuttons
and
Controls
3-1.
FOCUS
- Electrically focuses electron beam for clear
trace.
35. TRACE
ROT.-\
TOR
- Allows
trace
to be electrically
rotated to compensate
for different magnetic field conditions.
36.
VECTOR -
selects
"x·y"
operation with channel A input
providing vertical
deflection and channel Binput providing hori-
zontal deflection.
31. A & B- selects dual
trace
operation using both channel A
and channel B \'ertical input circuits. Dual
trace
display mode is
autt'matically determined by setting of TThIEBASE-FREQ
switch
(27)
with dual chopped operation between
100
and .1
msec. and dual
alternate
between 50 and
.1
usec. Dual
alternate
may be manually selected for slower sweep
rates
for special
applications b)' releasing all DISPL-\Y PUSHBUTIONs
(36
through
39)
to the
"out"
position.
38.
CHAN
8 - Selects single
trace
operation using channel B
input circuit only.
or
allov.'S
channel A andchannel B
to
beadded
when pressed simultaneously with
CHAN
Aselectorbutton
(39).
39.
CHAN
A- Selects single
trace
operation using channel A
input circuits only, or allows channel A and channel B to be
added when pressed simultaneously
with
CHAN
B selector
button
(38).
-10.
ASTIG:'IIATIS:'II
- Establishes focusing range
to
assure
that
FOCUS
control
(34)
operates properly
at
different settings
of INTENSITY control
(-II).
-II.
INTESSITY/PULL OS - Determines brightness of trace.
Pull knob to
appl)'
AC
power to unit,
-12.
COVER
LATCH
- Latches the optional scope cover.
PC227,
to
thecaseof the sC61.
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