Operation
Model
182C
Note
Option 01 1
instruments do not
increase
intensity when
FIND BEAM is pressed.
Use
the INTENSITY control to
set
Intensity to viewing
level.
3-20.
LINE
POWER
SWITCH.
3-21.
This toggle switch applies or removes
ac
line
input
power to the instrument. When ON, an indicator lamp,
located immediately
above
the switch, is illuminated.
Power for the lamp
is obtained
from
the low voltage power
supply. Both sides of the ac power line input are
interrupted when switched
to
OFF.
3-22. HORIZONTAL EXTERNAL
COUPLING.
3-23.
An external input signal may be connected to the
hori2 ontal amplifier via
the
EXT INPUT
BNC connector
when DISPLAY is set to EXT. The EXT COUPLING
switch is used to
select
ac
coupling
(capacitive coupling)
to the amplifier tor alternating voltages or
dc
coupling.
3-24. HORIZONTAL MAGNIFIER.
3-25.
This pushbutton switch controls the gain of the
horizontal amplifier. When switched from
XI to XIO, the
gain is increased ten times. For example, one volt
into
the
horizontal amplifier EXT INPUT jack produces 1 division
of deflection in XI
and 10
divisions of deflection
in
XIO.
3-26.
HORIZONTAL DISPLAY.
3-27. Either of two
modes
of operation
can be selected
with this switch. It selects the origin of the input signal
applied to the horizontal amplifier. When
INT is selected,
the
input signal to the horizontal amplifier is obtained
from the time base plug-in. With the switch
in EXT. the
sweep signal input from the
plug in is disconnected, and
input to the horizontal amplifier
is obtained from the
EXT
INPUT
connector located on the front panel.
3
28. EXTERNAL VERNIER.
3 29.
The deflection factor of
an external Input signal can
be continuously varied
to decrease
deflection
by a
factor
of approximately
10 by using diis control. When the
vernier is in
the
maximum clockwise position (CAL
detent),
the horizontal
amplifier is calibrated
to
provide
1.0 V/div
deflection
in the XI magnifier range
and
0.1 V/div in the XIO range.
330. REAR PANEL CONTROLS
AND CON
-
NECTORS.
3-31.
Rear panel controls and connectors are identified
and described in Figure 3-1. Additional information
regarding these is explained below in greater detail.
3-32.
OUTPUTS.
3-33.
Four BNC connectors
on the rear panel of
the
Model
182C are provided
to supply
signals from
the time
base or sampling
plug-in to external
equipment. The low
impedance
outputs are isolated from the high impedance
input signals. The period of the
signal output is directly
related
to
the
main and delayed sweep
speed
selected for
the time base plug-in or the vertical
and horizontal outputs
when used with sampling plug-ins. Refer
to the
Operating
and Service Manual for the
plug-in to determine signal
identification.
3-34.
The output of the MAIN SWEEP
OUTPUT and the
DELAYED
SWEEP OUTPUT
is a positive-going ramp
of
about
6
volts amplitude.
The output of the MAIN
GATE
OUTPUT
and
the
DELAYED
GATE OUTPUT is
a
negative-going pulse of
about 3 volts amplitude.
These
outputs can supply
3 mA and will drive impedances as low
as 1000 ohms wiihoutdlsiortion.
3-35.
Z-AXiS INPUT.
3-36. An external
signal can be utilized
to control the
CRT intensity. The
intensity modulation signal
is applied
directly
to
the
CRT intensity
gate
amplifier.
A pulse of
approximately
-f2V
amplitude and a width of
at least 50
nanoseconds or
a
-t-2V
continuous wave (cw)
input of
10 MHz or lower will blank
a
trace of
normal intensity.
Input of
a
negative
signal can be used for display
intens-
ification,
3-37.
AC LINE INPUT.
3-38.
A
three-conductor
ac power cord is provided for
ac
input. A power line ground is
obtained
through the
power
cord. Also located on the rear panel is
the SELECTOR
line slide switch, which allows
operation from either
115V
or 230V ac power line. Fuses
are
provided for
both 115V
and 230V operation.
3-39.
PHASE/BANDWIDTH SWITCH.
3-40. A PHASE/0ANDWIDTH
switch is located within
the instrument
on the horizontal amplifier
assembly. The
instrument
top cover must be removed for
access to this
switch
Positioning
the PHASE/BANDWIDTH
switch
to
PHASE causes the horizontal input signal to be delayed
the same amount of
time as the vertical input signal.
This
delay allows the
Model
182C to be used for phase
measurement. The
switch should always
be in the
BANDWIDTH position unless the
instrument is being used
for
phase measurement.
3-41.
PHASE
MEASUREMENT.
3-42.
Channel A
of multi-channel
vertical plug-ins should
be used when making phase measurements. When
a
dif-
ferent channel (other than A) is to be used, the
oscilloscope
horizontal amplifier should be properly
ad-
justed
(or
that
channel.
Section
V
of this
manual contains
the
adjustment procedure. Accurate
phase measurements
may be made at frequencies
up to 100 kHz.
32
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