AIR FORCE T033A1
-13-496-1
NAVELEX
0969-LP-170-0010
Operation Instructions
SECTION
IV
OPERATION
INSTRUCTIONS
4-1.
THEORY OF
OPERATION. The
following dis-
cussion
describes
the
operation
of
the
oscilloscope
cir-
cuitry.
First
a
general
description
of
the
overall
relation-
ship
between
the basic
circuits is
given. Then each
circuit
is
described
in detail.
4-2.
BASIC
CIRCUIT
FUNCTIONS.
The
overall
relationship
between the
basic circuits is
described
below.
Refer to
the
basic block
diagram
shown in
Figure
4-1
to
aid in
understanding
the
discussion.
a.
Vertical
Module.
The
Vertical Module
contains
the
CH
1
and CH 2
Input,
CH
1
and
CH
2
Preamplifier and
Vertical
Switching
Hybrid
Integrated Circuit,
Vertical
Switching
Control
Circuit, Delay
Line Driver and
Delay
Line, and the
Vertical
Amplifier (see
Figure 4-1).
(1)
CH
1
and
CH
2
Input. The
Input circuits
pro-
vide input
coupling
and attenuation
for the signals
con-
nected to
the CH 1
and CH 2 input
connectors. AC, DC,
and GND
coupling
modes are provided.
Two attenuators
in each
channel
provides attenuation
factors of 10:1,
100:1,
or
when switched
in series 1000:1.
(2)
CH 1 and
CH 2
PreemplWer ewd
Vertiwl
Switching. U4160
is
a
hybrid integrated
circuit which
con-
tains the
Vertical
Switching circuitry
ar>d laoth the
CH
1
arvd CH
2
Preamplifiers.
(a)
The
signal from
the vertical input
attenuators
is applied
to
U4160,
amplified, ar>d supplied to
the Delay
Line Driver. In
conjunction with the
input attenuators,
the gain of the
preamplifiers is
changed
to
provide
the de-
flection
factors
indicated by
the
VOLTS/DIV switches. A
sample of the signals
present in the
amplifiers is supplied
to the
Trigger
Switching and
Trigger Input
Amplifiers in
the
Horizontal
Module.
(b) The
Vertical Switching
circuitry selects
which
preamplifier will supply the signal to the
Delay Line
Driver.
(3). Vertical Switching Control.
Inputs
to
this cir-
cuit are from
the
VERT MODE
switch and
from the
Sweep Control
circuit (alternate sync pulse). The output
is
supplied
to U4160
to
control Vertical Switching.
(4)
Delay Line
Driver
and
Delay Line.
The
vertical
signal from
the CH 1 and
CH
2
Preamplifiers is amplified
by
the Delay
Line Driver and supplied to the Delay Line.
The Delay
Line delays the vertical signal enough so the
portion
of the vertical signal initiating the
sweep
can be
viewed.
(5)
Vertical
Amplifier.
This circuit
amplifies
the sig-
nal from the
Delay
Line. The amplified
signal is used
to
drive the vertical
deflection plates
of the crt.
b.
Horizontal
Module. The
Horizontal Module contains
Trigger Input
Amplifiers and
Trigger Switching,
A
Trigger
Generator, B T
rigger Generator, A
Sweep Generator,
B
Sweep
Generator, Horizontal
Preamplifier, +A
GATE
OUT
Amplifier,
^B
GATE Buffer, and Sweep Control (see
Figure
4-1).
(1)
Trigger Input
Amplifiers and Trigger Switching.
The
Trigger Input
Amplifiers are
buffer amplifiers between
the Trigger
Generators and the source of the
trigger
signal.
Trigger Switching
selects the source of the signal used
to
trigger the
Sweep Generator(s) and selects the method of
coupling this signal
to
the Trigger Generator(s).
(2)
A Trigger Generator.
Using
a
signal selected
by
the A
Trigger SOURCE switch, the
A
Trigger Generator
produces
a
pulse which causes the A Sweep Generator
to
produce
an
A
sweep
ramp.
(3)
B Trigger Generator. Using
a
signal selected
by
the B Trigger
SOURCE
switch, the B Trigger Generator
produces
a pulse which causes the
B
Sweep Generator
to
produce
a B sweep ramp.
(4)
A
Sweep
Generator.
The A Sweep Generator,
when initiated
by the
A
Trigger Generator,
produces
a
linear sawtooth output signal.
The
slope
of the sawtooth
is controlled
by the A
TIME/DIV
switch.
(5)
B Sweep
Generator. The B Sweep Generator
is
basically the same
as the A Sweep Generator. However,
it produces
a
sawtooth
output
signal
only after
a
delay
time selected by the
A
TIME/DIV
switch and the DELAY
TIME POS control. When the
B
Trigger
SOURCE switch
is
in
the STARTS AFTER DELAY
position,
the B Sweep
Generator begins
to
produce
a sawtooth immediately
following
the
selected
delay time. In
the
other positions
of
the B Trigger SOURCE
switch, the
B Sweep Generator
does not
produce
a
sawtooth until
it receives
a
trigger
pulse
occuring after the selected
delay time.
4-1
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