Tektronix 465M User Manual

^The
output
of U762
is
level
shifted by
several
series
connected
diodes.
The
level
shifted
voltage
controls
the
conduction
of Q766.
The
collector of
Q766
controls
the
conduction
of
Q768
which
controls
the
-5
volt
supply
output
voltage.
Transistor
Q764
provides
overcurrent
protection
for the
—5
volt
supply.
_4
Regulation
of
the
—5
volt
supply
occurs
as
follows.
Assume
the
—5
volt supply
tries to
go
more neg-
ative.
This tries to
force the
inverting
input
of U762
neg-
ative.
The output
of U762
drives the
base
of
Q766 less
negative.
This causes
Q768 to
conduct
less,
causing
its
collector to
go
less
negative and
correct
the
original
condition.
(e)
Overcurrent
Protection.
The
following
de-
scribes
overcurrent
protection for
the
-t32
volt
supply.
Overcurrent
protection
for the
-t5
volt
and
—5
volt
sup-
plies operates
in
a
similar
manner.
As the load
on
the
+32 volt supply
increases,
the
voltage
dropped across
R734
(the
current
sensing
re-
sistor) also
increases.
As
the voltage
across R734
increases
it forces
the
emitter and
the base
of Q736
more
positive.
AIR
FORCE
T033A1
-13-496-1
NAVELEX
0969-LP-170-0010
Operation
Instructions
^When the
load on the
+32 volt supply be-
comes
excessive,
the
voltage on
the base
of
0736
becomes
sufficiently
positive to
forward bias
0734 through R732
and R733.
As
0734
begins to
conduct, it
reduces the for-
ward bias
on
0732 and
0736
causing the
+32
volt
supply
output to go
less
positive. The
greater
the load
on
the
+32
volt supply
the
more
0734
conducts and
the less
positive
the
+32 volt
supply
goes.
^The
current
sensing
resistors for the
+5 and
—5
volt
supplies are
R748
and R768
respectively.
(f)
+95 Volt Supply.
Figure FO-9 shows
the
+95
volt
supply.
The
+95 volt
supply
consists of CR582
and
associated
circuitry.
The
+95 volt
supply is
powered
by
the high
voltage
oscillator
through
T550. The ac
voltage
on pin 2
of T550
is half
wave
rectified
by
CR582.
The
half wave
rectified
voltage is
filtered by C582, L582,
and
C584.
Regulation
is provided by
the
high voltage
regulator.
4-4.
FUNCTIONS
OF
CONTROLS,
CON-
NECTORS,
AND
INDICATORS.The
location
of
controls,
connectors,
and
indicators is
shown
on
Figure
FO-1 in
the
foldout
section at
the rear of
this
manual.
De
tailed
function
descriptions
are
listed in
Table
4-2.
4-29

Tektronix 465M Specifications

General

Brand	Tektronix
Model	465M
Category	Test Equipment
Language	English