Tektronix 465B User Manual

Theory of Operation—
465B Service
the A Sweep Generator
circuit. The A
gatesignal, which is
also coincident
with the sawtooth, is
available at the A
+GATE
connector on the instrument rear panel The
Sweep
Control Logic circuit also
produces a Horizontal
Alternate
Sync pulse. This pulse is
fed to the Horizontal
Display Logic
circuit to switch
the display between A
Intensified
and B Delayed sweeps
when the ALT Horizon-
tal
Display mode is selected.
The B
Sweep Generator circuit
is
basically the
same as
the A Gweep
Generator circuit. I lowevei,
this circuit only
produces a sawtooth
output signal when
a
delay
time
period, determined
by the DELAY TIME
POSITION dial
has lapsed,
or when
a trigger pulse is received
from the B
Trigger
Generator circuit.
If the B TRIGGER SOURCE
switch is set to the STARTS
AFTER DELAY
position, the B
Sweep Generator begins
to produce the
sweep im-
mediately
following the selected
delay time. If the
SOURCE
switch is in
one of
the
remaining positions,
the B
Sweep
Generator circuit
does
not
produce a sweep
until it
receives
a trigger pulse from the
B
Trigger
Generator
circuit.
The output
of either the
A or
B Sweep Generator
is
amplified
by
the
Horizontal
Amplifier
circuit
to
produce
horizontal
deflection
for the
ert, except
when the
A
TIME/DIV
switch
is in the fully
counterclockwise
(X-Y)
position. The
Horizontal
Amplifier circuit
contains
a X10
magnifier
that may
be selected
to increase
the sweep rate
10 times in
any A
or B TIME/DIV
switch
position. Other
deflection
signals
may be
connected to the
Horizontal
Amplifier
by using the
X-Y
mode of operation.
When the
TIME/DIV
switch is
set to
X-Y,
the X signal is
connected
to
the Horizontal Amplifier
circuit through
the Channel 1
Vertical Preamplifier
circuit.
The Z-Axis
Amplifier circuit determines
the ert intensity
and blanking. The
Z-Axls Amplifier circuit
sums the
current
inputs from the INTENSITY
control, Vertical
Switching
circuit (chopped blanking),
Z-Axis Logiccircuit
(unblanking),
and the EXT Z-AXIS
Input connector.
The
output level of the
Z-Axis Amplifier circuit controls
the
trace intensity through
the CRT circuit.
The
CRT
circuit
provides the voltages
and
contains
the controls
necessary
for operation
of the cathode-ray tube.
The Power
Supply circuit provides the
low voltage
power necessary for
operation of the
465B. Low voltage
power is distributed to all circuits
in the instrument.
The Calibrator
circuit
produces a square-wave
output
(with
both accurate voltage and
current amplitudes)
that is
useful
for both checking the calibration of the instrument
and
compensating probes.
The CALIBRATOR
current
loop
provides an accurate
current sourcefor calibration
of
current-measuring
probe systems.
REV A JUN 1979 33

Tektronix 465B Specifications

General

Brand	Tektronix
Model	465B
Category	Test Equipment
Language	English