•
""
•..
.
..
CH.
...
SHH8
_.
._-
•
TR1GGEJI
- -
4.
Adjust
Trigger
(
·c·y-~-:o.'iJ·
~.~.l:tt:=:::a.
Set source to
"CH
A"
b.
Set mode to "AUTO"
c.
Set polarity to .. +"
d. Adjust level until
trace locks
•
....
_~
_._-
_.-
o
-
-
....
<'"-
-
3.
Apply
slgnal-------..,
a. INPUT COUPLING to
"AC"
b.
Set VOLTSiDIVISION switch
I
MODEl 5 "
•••
.·'U
e-
......
~."",
•
•
~.-
....
...
_.
'-i--
...
- .-
..
-
•
.
.....
_ .
....
_"
I
2.
Select display
6.
Adjust
for
best trace
5.
Adjust
TIMEBASE·
FREQ
switch
for
desired waveforms
Fig.
2 _ Follow this sequence to get 8 trace on the SC61. Note that the triggercontrols are marked for a channel A signal.
Control(s)
to Check
(after releasing
BEAM
FINDER)
Locating
the
trace
with
the
BEAM
FINDER
You
may occasionally lose the trace because one or more of the
CRT
controls
is
improperly set. Pressing the
BEAM
FINDER
button overrides several internal
circuits
10
force the trace back
onto the screen. The position
of
Ute
traces with
Ute
BEA.'t
Fl:-'"DER
button pressed indicates what steps
are
necessary to
obtaina properly
centered trace.
The
BEA:\t FINDER o\'errides four circuits
.....
hen the button
is
pressed: 1. The Il\TEi\SITY control
is
bypassed
to
show
the
trace position
when the intensity
is
reduced.
2.
The trigger cir·
cuits
are
disabled to produce a trace
if
"normal" triggering is
selected
....
iUt
Ute
TRIGGER
~toDE
s
.....
itch.
3.
The gain
of
Ute
\'ertical amplifiers is redured to bring the trace onlo the
CRT
screen
no
matterwhere
the
"ERTICAL
POSITIO~
controls
are
set, and -I. The gain
of
the horizontal amplifier
is
reduced to
foree the trace onto the
CRT
horizontally. These four conditions
will force
Ute
trace onto the screen for any combination
of
control seuings.
The
follo
....
ing
table sho
....
-s
bow
10
interpret the
CRT
trace
.....
hen
using the
BEA~t
FI~"DER.
Remember that one
or
t
.....
o traces
....
i11
appear. depending
on
which
CRT
display mode is selected
....
iUt the
CRT
selector pushbuuons.
You
may
.....
ish to locate one
trace at a time
by
selecting the
CH.-\~
,J"
and then
CHAN
B
button.
What
Appears
on
SCreen
(with BEAM
FINDER
pressed)
Beam at center
of
screen
..
, , . , ,
..
,
.....
Iniensltyrrrigger Mode
Beam above
or
below center
,.,.,.
Vertical Position
Beam at
left
or
right
of
center,
..
" Horizontal Position
1I
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