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Section
III
Paragraphs
3-14
to
3-19
Model
182
lA
triggers.
Direct (DC) coupling
is
normally used
for
any
trigger signal
from
DC
to
greater than 90
MHz.
Capacitive (AC) coupling should be selected
when
it
is
desirable
to
block
the
dc
level
of
the
trigger
signal.
AC
coupling,
however,
will
attenuate signals
below 20
Hz.
AC
fast
(ACF)
attenuates signals
below
15
kHz
and
is
used, for instance,
to
eliminate 60
Hz
ripple
that
might
trigger
the
sweep.
AC
slow (ACS)
attenu-
ates signals
above 30
kHz.
ACS
is
used
to
eliminate
high-frequency
noise.
3-14.
SLOPE.
The
setting
of this
switch
determines
whether
the
sweep
triggers on
the
positive-going
(+)
or negative-going
(-)
portion
of
the
trigger
signal.
When
Delayed Trigger Source
is
set
to
AUTO
the
de-
layed
SLOPE
control
does
not function.
3-15.
LEVEL.
This
control establishes
the point
on
the
trigger
waveform
that starts the
sweep.
This
point
is
adjustable
from
-3
v
to
+3
v along
the
selected
slope.
With an
external trigger
and
the
Trigger Source
switch
in
EXT-4-10,
the
trigger point
is
adjustable
from
-30
v
to
+30
V
along
the
selected
slope.
When
the
Delayed
Trigger Source
switch
is in
AUTO,
the
Delayed
LEVEL
control
does
not function.
The
Main
LEVEL
control
can always vary
the
trigger point for
the
main
sweep.
3-16.
TRIGGER SIGNAL
REQUIREMENTS.
3-17.
Table
3-
1
shows
the
trigger signal
requirements
of
the
Model
182
lA
with various
combinations
of
con-
trol settings.
Figure
3-2
is
used
in
conjunction with
Figure
3-2.
Trigger Amplitude Requirements
the table to
determine
the typical
trigger
amplitude
necessary
at
frequencies up
to
100
MHz.
3-18.
OPERATING
INSTRUCTIONS.
3-19.
Figures
3-3 through 3-7 give step-by-
step
operat-
ing instructions for the
Model
182 lA.
These
instruc-
tions
are
keyed
to
the
photograph
in
each
figure
with
index
numbers.
The preceding paragraphs
contain
additional
information
and
should be
read
before using
the
operating
instructions.
Table
3-1.
Trigger
Signal
Requirements
SWEEP
MODE
TRIGGER
SOURCE
TRIGGER COUPLING
TRIGGER
AMPLITUDE
LEVEL
SLOPE
LINE
DC;
dc
to
90
MHz
AC:
20
Hz
to
90
MHz
NORM
INT
See Figure
3-2
Adjustable
+3 V
to
-3 V
EXT
ACF:
15
kHz
to
90
MHz
ACS;
20
Hz
to
30
kHz
EXT-I-IO
10
times
that
shown
on Figure 3-2
Adjustable
+30
V
to
-30
V
Selectable
+
or
-
LINE
DC:
40
Hz
to
90
MHz
AUTO
INT
AC:
40
Hz
to
90
MHz
See Figure
3-2
Adjustable
+3 V
to
-3 V
EXT
ACF:
15
kHz
to
90
MHz
ACS:
40
Hz
to
30
kHz
EXT^IO
10
times
that
shown
on
Figure
3-2
Adjustable
+30
V
to
-30
V
SINGLE
Single
may
be selected
after setting
up any display
D
E
AUTO
No
function
Automatically
trig-
gered
at
end
of
delay
No
function
L
A
INT
DC:
DC
to
90
MHz
AC:
20
Hz
to
90
MHz
ACF:
15
kHz
to
90
MHz
ACS:
20
Hz
to
30
kHz
See Figure
3-2
Adjustable
+3
V
to
-
3
V
Selectable
Y
E
D
EXT
+ or
-
EXT^-10
10
times
that
shown
on Figure 3-2
Adjustable
+30
V
to
-30
V
3-2
02591-2
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