Tektronix 465M User Manual

of
U4160
LO.
Terminals 15
and
20
of R4160 are
pulled
HI through
R4312. This
turns off
the
CH
2
series gate
and
turns on the CH 1 series
gate. The CH
1
signal passes to
terminals 17
and
18
of
U4160.
(c)
CH
2
Vertical Mode. This mode
works the
same as the CH 1
mode except
—5
volts is connected to
R4313 setting
terminals 15 and 20
LO
and terminals 16
and 19 are
pulled HI through R4322. This turns
on the
CH 2
series gate and allows the CH
2
signal
to
pass to
terminals 17 and 18
of
U4160.
(d) Add
Vertical Mode.
^
In the ADD mode the algebraic sum of the
output
signals from the CH 1 and CH
2
Preamplifiers is
supplied to
terminals 17 and
18
of
U4160.
^When the
VERT
MODE switch (S4330) is
set
to
ADD, neither R4313 nor R4323 are
connected
to
—5
volts. This allows terminals 15
and
19
to
be
pulled HI
through R4312 and R4322 respectively. Terminal 20 is
also
pulled positive through R4312 but,
because
of
CR4312, terminal 20 is LO with respect
to
terminal
15.
In the same way,
terminal
16 is LO with respect to
termi-
nal 19 due to CR4322.
This turns
on both the
CH
1
and
CH 2
series gates and turns off
both
shunt gates (see
Figure
4-2). Both signals pass
to
terminals
17
and
18
of
U4160.
(e) ALT Vertical Mode.
In
the ALT
mode the
channel
switching multivibrator operates
as a
bistable multi-
vibrator.
The
state
of the multivibrator is switched
at
the
end of
each
sweep. The CH
1
and
CH 2
signals are in-
dividually displayed on alternate sweeps.
2
When the VERT MODE
switch is
set
to
ALT,
—5
volts
is
connected
to
the
emitter of Q4334
through R4333. The base of Q4334
is pulled
positive
with
respect
to
its
emitter
through
R4334. This turns on
Q4334
and
provides the negative supply voltage
for
the multi-
vibrator.
^When Q4334 turns on, either 04316 or
Q4326
will turn on.
Assume 04316 turns on. This pulls
terminals
15
and
20
of
U4160 LO. Terminals 16 and 19
are pulled
HI through R4322.
This blocks the
CH
1
signal
and
passes the CH 2 signal to terminals
17
and
18
of
U4160.
^While
Q4316 is on, the end of
C4316
con-
nected
to the emitter
of Q4316 charges positive with re-
spect
to the end connected
to the emitter of 04326.
4 At the end of each
sweep, the Sweep Control
circuit in
the
Horizontal Module
supplies
a
negative-going
pulse
to the
base of
Q4334. This
momentarily turns off
Q4334
removing
the ngative
supply voltage
from the
multivibrator.
Neither
Q4316
nor 04326
can conduct.
AIR FORCE
T033A1-13-496-1
NAVELEX
0969-LP-1 70-0010
Operation
Instructions
^We previously assumed 04316 was
on and
had charged the end
of
C4316
connected
to the emitter of
0431
6
positive with
respect
to
its other end.
When
04334
again turns on, the
emitter of
04326 will be more
negative
than
the
emitter of
04316.
Therefore
04326 will turn
on,
reversing the previously assumed condition.
Terminals
16
and 19 of
U4160
will be pulled
LO
through
04326 and
terminals
1 5
and 20 will be pulled
HI through R431
2.
The
CH
2 signal will be blocked and the CH
1
signal
will
pass to
terminals 17 and
18
of
U4160.
(f) CHOP Vertical
Mode. In the CHOP
mode
the
channel switching
multivibrator operates
as
an
astable
multivibrator. The CH
1
and
CH 2 signals are
alternately
displayed during
the
same
sweep. The switching
transients
are blanked and cannot
be seen.
When the VERT
MODE switch is
set
to
CHOP,
—5
volts is connected
to the emitters of
04316 and
04326 through R4318 and
R4328, respectively.
This
pro-
vides
the negative supply
voltage for the channel
switching
multivibrator.
The multivibrator
operates
as
an
astable
multivibrator with
a repetition rate
of
about 250 kilohertz.
Transistors
04316 and 04326
conduct alternately
to
switch the
CH 1 and
CH
2
transistor gates
in the same
man-
ner
as
for the ALT
setting of
the VERT MODE
switch.
^The frequency
determining
components are
C4316, R4318, and R4328.
^The chop blanking
amplifier
(04338)
pro-
vides
an output
pulse to the Z
Axis Amplifier
to blank the
switching
transients. During
the time
the
multivibrator
is
switching,
the current
change in
the primary
of
T4335 in-
duces
a
voltage in
the secondary.
This
induced
voltage
drives
the base of
Q4338 negative
which
turns
it off.
The
resulting
positive-going
pulse
on the
collector
of
04338 is
supplied
to
the Z
Axis
Amplifier in
the
Main
Module.
The
length of this
pulse is
determined
by R4335 and
C4335.
(4)
Delay Line
Driver
and Delay
Line.
Figure
FO-3
and Figure
FO-4
show
the Delay
Line
Driver and
Delay
Line
circuitry.
The Delay
Line Driver
buffers the
vertical
signal
from
terminals 17
and 18 of
U4160 and
supplies
it
to the Delay
Line.
The Delay
Line
delays
the vertical
signal
about
120 nanoseconds.
The Delay
Line
Driver and
Delay
Line
circuitry
also
contains
the NORM
trigger
signal
pick-
off,
the
BW LIMIT
20 MHz switch,
and
the
TRIG
VIEW
switch.
(a) Delay
Line
Driver.
The
output
from
the
chan-
nel
switching
gates,
at terminals
17 and
18
of
U4160,
is
applied
to the Delay
Line
Driver
(Q4342,
04352,
04362,
and
Q4372). Transistors
Q4342 and
04352
buffer
the
out-
put of U4160
to provide
optimum
frequency
response.
Transistors
Q4362
and
Q4372
are
connected
as feedback
4-7

Tektronix 465M Specifications

General

Brand	Tektronix
Model	465M
Category	Test Equipment
Language	English