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Tektronix FG 5010 User Manual

Tektronix FG 5010
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C
POWER
SUPPLIES
INTRODUCTION
All
of
the
current
required
for
operation
of
the
FG
5010
is
taken
from
the
Power
Module
.
This
is
derived
in
several
ways
:
A
dc
voltage
is
taken
directly
from
the
Power
Module
,
as
in
the
case
of
the
+26
V
and
-26
V
supply
;
an
ac
voltage
is
taken
from
the
Power
Module
and
rectified
,
as
in
the
case
of
the
+
and
−35
V
supplies
;
and
a
dc
voltage
is
derived
from
a
dc
supply
in
the
Power
Module
,
as
in
the
case
of
the
+
and
-12
V
supplies
,
and
the
+5
V
supply
.
Refer
to
Fig
.
4-19
,
which
is
a
block
diagram
of
the
voltage
supplies
in
the
FG
5010.
The
voltages
from
which
the
supplies
derive
current
are
the
+26
V
,
−26
V
,
+8
V
,
and
two
35
Vac
Power
Module
supplies
.
The
+26
V
is
applied
through
a
filter
,
from
where
it
is
used
by
the
+12
V
supply
as
the
source
of
power
.
The
+26
V
passes
through
another
filter
for
application
to
the
FG
5010
circuits
.
The
unfiltered
+26
V
is
also
applied
to
the
+16
V
regulator
and
the
+35
V
rectifier
-
regulator
.
The
25
Vac
from
the
Power
Module
is
applied
to
the
+
35
-
volt
rectifier
-
regulator
,
where
the
voltage
is
rectified
,
filtered
,
and
stacked
on
the
+26
V
to
form
the
+35
V
to
the
Offset
Generator
.
Likewise
,
25
V
ac
is
applied
to
the
-35
V
rectifier
-
regulator
,
which
operates
in
the
same
way
as
the
+35
V
circuit
,
except
that
it
is
stacked
on
the
-26
V
supply
.
Power
from
the
-26
V
Power
Module
Supply
is
applied
to
the
-
35
V
circuit
,
-16
V
Regulator
,
and
-5
V
Regulator
.
After
filtering
,
the
voltage
is
applied
to
the
---
12
V
Regulator
.
This
circuit
uses
the
+12
V
circuit
as
reference
to
produce
the
12
V
output
.
The
−26
V
,
like
the
+26
V
,
passes
through
another
filter
,
then
is
applied
to
the
FG
5010
circuits
.
The
26
V
is
also
applied
to
the
-5
V
Regulator
,
which
then
produces
the
-5
V
that
is
used
by
the
+5
V
regulator
and
other
circuits
.
The
Power
Module
also
furnishes
the
+8
V
that
is
used
to
produce
the
+5
V.
This
regulator
re
-
regulates
and
re
-
filters
the
+8
V
down
to
+5
V
,
then
applies
it
to
the
FG
5010
circuits
.
Also
part
of
this
area
of
the
description
is
the
Reset
Circuit
and
the
Maglatch
Strobe
Generator
.
The
Reset
Circuit
prevents
the
CPU
from
commencing
operations
until
the
power
supplies
are
ready
.
The
Maglatch
Strobe
Generator
produces
the
pulses
that
are
used
to
drive
the
magnetic
latching
relays
in
the
FG
5010
.
(
α
Theory
of
Operation
-
FG
5010
4
+5
V
REGULATOR
AND
MAGLATCH
-5
V
Regulator
This
circuit
consists
of
transistor
Q1630
,
Zener
diode
VR1630
,
and
resistors
R1630
and
R1631
.
The
−26
V
sup
ply
from
the
power
module
enters
the
FG
5010
via
the
Out
put
Amplifier
board
.
The
voltage
is
applied
across
R1630
and
VR1630
,
which
is
a
6.2
V
Zener
diode
.
Thus
,
the
base
of
Q1630
is
at
about
-6.2
V
,
and
the
emitter
is
about
a
junction
drop
positive
,
at
−5.5
V.
This
voltage
is
applied
to
the
+5
V
Regulator
.
+5
V
Regulator
The
+5
V
regulator
consists
of
the
following
major
cir
cuits
:
Main
Regulation
Amplifier
,
Current
Limit
Amplifier
,
Main
Current
Limiter
,
Over
-
voltage
Protector
,
and
Driver
Stage
.
The
regulator
converts
the
+8
V
from
the
power
module
to
a
regulated
+5
V.
This
regulator
is
designed
to
accommodate
only
part
of
the
transient
demands
from
the
FG
5010
,
so
some
of
the
peak
loads
are
passed
back
to
the
main
supply
in
the
power
module
.
To
do
so
,
the
Main
Regu
lator
is
a
fast
-
response
unit
that
can
quickly
couple
large
current
demands
to
the
+8
V
supply
.
Main
Regulator
.
The
Main
Regulator
stage
consists
of
Amplifier
U1420
,
transistor
Q1410
,
precision
reference
U1430
,
and
surrounding
components
.
Amplifier
U1420
is
a
high
-
speed
operational
amplifier
,
designed
to
pass
major
current
demands
to
the
power
module
.
Ordinarily
,
Q1410
does
not
conduct
.
However
,
should
one
of
the
limiter
stages
(
i.e.
,
over
-
voltage
protector
,
current
limit
amplifier
,
or
current
limiter
)
come
into
action
,
the
output
of
U1420
would
rise
positive
and
eventually
saturate
.
Before
this
can
occur
,
Q1410
conducts
,
forming
a
current
path
back
to
the
inverting
input
of
the
amplifier
.
Thus
,
the
upper
limit
for
the
output
of
U1420
is
one
junction
voltage
above
the
base
potential
of
Q1410
.
Amplifier
U1420
senses
the
difference
between
the
volt
age
at
the
junction
of
R1312
and
R1313
,
and
the
2.5
V
ref
erence
from
U1430
.
Changes
in
output
voltage
cause
the
voltage
at
the
junction
of
R1312
and
R1313
to
change
pro
portionately
,
causing
an
error
voltage
at
the
input
of
U1420
.
This
error
voltage
is
amplified
by
U1420
and
applied
to
the
driver
circuit
to
correct
the
error
in
the
regulator
output
.
4-43

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Tektronix FG 5010 Specifications

General IconGeneral
BrandTektronix
ModelFG 5010
CategoryPortable Generator
LanguageEnglish

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