POWER DESIGNS X336 User manual
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INSTRUCTION
MANUAL
POWER
SUPPLY
MnnFL
^33^
SERIAL___2_Lf_
/
%
I
POWER
DESIGNS
STANDARD
VOLTAGE
SOURCE
TECHNICAL
MODEL
X-336
10
VOLTS
DC
0-25
MA
VVi.'S'S;:'.
This
high-stability,
low-impodance
secondary
voltage
standard
is
the
product
of
the
latest
solid-state
circuit
technology.
Conventional
chopper
techniques
are
avoided
by
maintaining
critical
circuit
elements
in
a
temperature-con
trolled
environment.
Design
simplicity
results
in
a
highly
reliable,
compact
instrument
suit
able
for:
a/d
converters
SYSTEM
REFERENCES
CALIBRATORS
COMPARATORS
ANALOG
CONTROLS
DESIGN
FEATURES
Stability
better
than
0.001%
per
8
hours,
0.005%
per
month.
0.0005
ohm
source
impedance.
2.5
PPM
per
°C
temperature
coefficient.
10.000
VDC
output,
adjustable
±50
MV,
with
25
/jV
resolution.
>
Self-restoring
automatic
overload
and
short-circuit
pro
tection.
I
Remote
sensing.
'
Modular
packaging
in
Type
JA
case
(MIL-T-27A).
Each
instrument
is
pre-aged
100
hours
before
test
and
calibration.
I
Processed
under
Power
Designs'
"Predictable
Reliability"
program
for
5-year
MTBF.
The
program
features:
avalanche
controlled
silicon
rectifiers,
stress-tested
transistors,
pre-
aged
zener
references
with
extrapolated
stability
criteria
based
on
^/f
noise
changes,
computer-grade
capacitors,
tin-oxide
film
resistors,
5
PPM
sealed
divider
resistors,
and
components
operated
at
50%
of
manufacturers'
published
maximum
ratings.
>
Complete
repairability.
■aY--
ELECTRICAL
SPECIFICATIONS
OUTPUT
10.000
VDC,
adjustable
±50
MV,
0
to
25
MA
TEMPERATURE
COEFFICIENT
2.5
parts
per
million
per
°C
INPUT
115
V
±10%,
57-440
Hz,
9
watts.
RIPPLE
AND
NOISE
Less
than
1
MV
peak-to-peak.
RESETTABILITY
AND
RESOLUTION
Better
than
25
uV.
OUTPUT
CONNECTIONS
10-pln
Kovar
glass
solder-pin
header
at
bottom
of
case.
Connections
for
AC
Input,
DC
output,
remote
sensing,
circuit
ground,
and
oven
monl
toring
are
provided.
LOAD
REGULATION
Better
than
10
uV
for
a
10
MA
step
change.
LINE
REGUUTION
Better
than
0.005%
for
a
10%
change
In
line
voltage.
SOURCE
IMPEDANCE
Less
than
0.5
mllllohm
at
DC,
less
than
0.5
ohm
at
1
MHz.
STABILITY
Better
than
0.005%
per
month
at
constant
line
load,
and
ambient
temperature
after
warm-up
OVERALL
STABILITY
Better
than
0.01%
per
month
for
any
combina
tion
of
line,
load,
and
ambient
temperature
within
the
above
specifications.
OPERATING
TEMPERATURE
RANGE
10°C
to
60°C
(at
relative
humidity
level
up
to
90%).
POLARITY
Positive,
negative,
or
floating.
CONNECTING
HEADER
>l7
DIA
BOTTOM
VIEW
MECHANICAL
SPECIFICATIONS
DIMENSIONS
3"
X
3/2"
X
5X4".
MOUNTING
Four
8-32
x
%"
studs
on
2%"
x
2>^"
centers.
WEIGHT
2J^
pounds.
FINISH
Case
is
finished
in
gray
vinyl
enamel;
mounting
plate
has
tinned
finish.
PRICE
Westbury
POWER
DESIGNS,
INC.
1700
SHAMES
DRIVE
•
WESTBURY,
L
I
.
,
NEW
YORK
•
516
ED
3-6200
TWX:
510-222-6561
POWER
DESIGNS
PACIFIC,
INC.
3381
JUNIPERO
SERRA
•
PALO
ALTO,
CALIFORNIA
•
415-321-6111
TWX:
910-373-1251
PRINTED
IN
U.S.A.
ADDENDA
POVfflR
SUPPLY
MODEL
X-336
The
Schematic
Diagram
and/or
Electrical
Parts
List
are
modified
as
follows:
1.
Resistor
R11
is
a
composition
type,
680
ohms,
10?^,
i-
w,
part
number
EB6811
(manu-
factirer
61121;.
2.
The
value
of
resistor
R23
is
determined
at
final
factory
calibration.
640
CAUTION
DO
NOT
OPERATE
SUPPLY
WITHOUT
CONNECTIONS
BETWEEN
+DC
AND
+S
AND
BETWEEN
-DC
AND
-S.
603-X33^
POWER
SUPPLY
MODEL
X336
SECTION
I
GENERAL
DESCRIPTION
1-1
DESCRIPTION
Power
supply
model
X336
's
a
highly
regulated
dc
reference
source
PROVIDING
AN
OUTPUT
OF
10.000
VOLTS
DC
AND
CAPABLE
OF
DELIVERING
UP
TO
25
MA
OF
CURRENT
TO
THE
LOAD.
ThE
OUTPUT
VOLTAGE
IS
ADJUSTABLE
OVER
A
±
50
MV
RANGE
(from
NOMINAL)
BY
THE
VOLTAGE
ADJUST
POTENT
IOMETERj
ACCESSIBLE
FROM
THE
TOP
OF
THE
CASE.
The
HIGH
DEGREE
OF
REGULATION
IN
THIS
POWER
SUPPLY
IS
ACHIEVED
THROUGH
THE
USE
OF
SILICON
SOLID-STAGE
CIRCUITRY
AND
BY
MAINTAINING
THE
REFERENCE
AND
SENSING
CIRCUITS
AT
A
CONSTANT
TEMPERATURE
IN
A
temperature
STABILIZED
OVEN.
ThE
POWER
SUPPLY
IS
CAPABLE
OF
BEING
CONNECTED
FOR
LOCAL
OR
REMOTE
SENSING.
A
FULLY
TRANSISTORIZED
CURRENT
LIMITING
CIRCUIT
PROTECTS
THE
POWER
SUPPLY
FROM
DAMAGE
CAUSED
BY
OVERLOADS
OR
SHORT
CIRCUITS.
THE
SUPPLY
AUTOMATICALLY
RECOVERS
TO
NORMAL
OPERATION
WHEN
THE
OVERLOAD
OR
SHORT
CIRCUIT
IS
REMOVED.
1-2
ELECTRICAL
SPECIFICATIONS
Table
1
lists
the
electrical
specifications
of
the
power
supply.
1-3
MECHANICAL
SPECIFICATIONS
The
model
X336
is
packaged
in
a
MIL-T-27A
case,
JA
size.
The
CASE
is
finished
IN
GRAY
ENAMEL.
ThE
MOUNTING
PLATE
HAS
A
TINNED
FINISH
AND
IS
FITTED
WITH
A
SOLDERABLE,
10-PIN
HEADER.
ThE
DIMENSIONS
AND
WEIGHT
OF
THE
MODEL
X336
ARE
AS
FOLLOWS:
Width:
3-1/2
in.
Height:
5-1/4
in.,
approx.
Depth:
3
in.
Weight:
2-1/4
lbs.
-1-
604-X336
-
\'
c
-\
\:A
"•
■
*
'
'
;''Vv
■
,
V.
'
iC'/,
-
»
'/•
'•
.
.
.
0
-
.
r
-a".
.V-
X336
SECTION
1
(cont'd)
TABLE
1.
ELECTRICAL
SPECIF!CAT
IONS
Input
power
requirements
(
115
VOLTS
±
"[0%,
57
TO
i^i^O
HZ.
Operating
temperature
limits
lO^C
TO
60°C
(up
TO
A
RELATIVE
HUMIDITY
LEVEL
OF
80^)•
Output
sPECifiiCATions•
VOLTAGE
AND
CURRENT
10.000
VDC,
25
MA*
LOAD
REGULATION
LESS
THAN
0.0001J?
FOR
10
MA
STEP
CHANGE
IN
LOAD
AT
CONSTANT
TEMPERA
TURE
AND
CONSTANT
LINE
VOLTAGE-
LINE
REGULATION
LESS
THAN
0.0G05J^
FOR
"[0%
STEP
CHANGE
IN
LINE
VOLTAGE
AT
CONSTANT
TEMPERA
TURE
AND
CONSTANT
LOAD.
R1PPLE
0.01^
PEAK-TO-PEAK,
MAX.
TEMPERATURE
COEFFICIENT
LESS
THAN
0.00025^/*'C
FROM
10®C
TO
60°C.
LONG-TERM
STABILITY
LESS
THAN
±
0.005^
PER
MONTH
AT
CONSTANT
TEMPERATURE,
LINE,
AND
LOAD
AFTER
ONE-HOUR
WARM-UP.
OVER-ALL
STABILITY
±
O.OIJ^,
MAX.,
FOR
ANY
COMBINATION
OF
LINE,
LOAD,
AND
AMBIENT
TEMPERATURE
CHANGES
WITHIN
ABOVE
SPECIFICATIONS
-2-
6o4-x336
•
J-
.
,
-
t
■
^
'
■
X336
SECTION
I I
INSTALLATION
AND
OPERATION
2-1
GENERAL
INSTALLATION
NOTES
The
power
supply
may
be
mounted
in
any
position
by
means
of
the
FOUR
THREADED
(6-32)
MOUNTING
STUDS.
To
AID
IN
THE
ELECTRICAL
INSTALLATION
OF
THE
POWER
SUPPLY,
TaBLE
2.
PROVIDES
A
CROSS
REFERENCE
BETWEEN
HEADER
PIN
NUMBER
AND
FUNCTION.
As
INDICATED
IN
TaBLE
2.,
PIN
9
IS
CONNECTED
TO
JUNCTION
OF
THE
OVEN
HEATER
AND
THERMOSTAT
FOR
THE
PURPOSE
OF
MONITORING
OVEN
OPERATION.
1f
IT
IS
DESIRED
TO
MONITOR
THE
OVEN
CYCLING,
CONNECT
A
NEON
LAMP
ASSEMBLY
(INDUSTRIAL
DEVICES
2nOA28
OR
EQUIVALENT)
ACROSS
PINS
1
AND
9
OF
THE
HEADER.
TABLE
2.
HEADER
PIN
WIRING
Pin
No.
Function
1
AC
INPUT
2
NO
connection
3
+DC
4
+
SensiNG
5
-
Sensing
6
+
DC
7
transformer
electrostatic
shield
8
GROUND
(case)
9
junction
of
oven
heater
and
THERMOSTAT
(fOR
MONITORING
OVEN
operation)
10
AC
INPUT
2-2
LOCAL
AND
REMOTE
SENSING
OPERATION
The
POINTS
to
which
the
sensing
leads
are
connected
are
the
POINTS
BETWEEN
which
THE
OUTPUT
VOLTAGE
IS
MAINTAINED
CONSTANT.
REMOTE
SENSING
SHOULD
BE
USED
WHEN
LARGE
VOLTAGE
DROPS
ARE
ANTICIPATED
IN
THE
LEADS
CONNECTING
THE
LOAD
AND
POWER
SUPPLY
DUE
TO
THEIR
LENGTH.
LoCAL
SENSING
SHOULD
BE
USED
WHEN
THE
LEAD
RESISTANCE
IS
KNOWN
TO
BE
NEGLIGIBLE
OR
WHEN
the
increase
IN
REGULATION
CAN
BE
TOLERATED.
If
THE
VOLTAGE
IS
SENSED
AT
6o4-x336
i-!
,
.
..
J
*
b,
.
thy.
''U-i
r
m-'i-r,
O/
;...
.
.
/,•
■*
bi-;
I?
'■
X336
SECTION
1 1
(cont'd)
THE
OUTPUT
(Vq)
of
THE
SUPPLY^
THE
VOLTAGE
ACROSS
THE
LOAD
(V,
)
CAN
BE
DETERMINED
AS
FOLLOWS:
Vl
=
Vo
-
II
X
Rlw
where:
-
LOAD
CURRENT
Rlw
-
resistance
OF
BOTH
LEADS
BETWEEN
THE
POWER
SUPPLY
AND
LOAD
2-3
LOCAL
SENSING
-
For
local
sensing
connect
pins
3
and
together,
AND
PINS
5
and
6
together.
CONNECT
LOAD
BETWEEN
PINS
3
AND
6.
2-k
REMOTE
SENSING
-
For
remote
sensing,
connect
load
leads
to
pins
3
AND
6
AND,
OBSERVING
PROPER
POLARITY,
CONNECT
LEADS
FROM
PINS
4
AND
5
TO
THE
SENSING
POINTS.
-4-
60H-X336
■'i
t.
'
,
1-
L
■■
X336
SECTION
I I
PRINCIPLES
OF
OPERATION
3-1
GENERAL
The
model
X336
circuitry
may
be
divided
into
three
main
parts
IREFER
TO
THE
SCHEMATIC
DIAGRAM
FOLLOWING
SECTION
IV):
A
FULL-WAVE
RECTIFIER
CIRCUIT,
A
SERIES
REGULATOR
AND
CURRENT
LIMITER
CIRCUIT.
AND
AN
AUXILIARY
(bIAs)
SUPPLY.
3-2
FULL-WAVE
RECTIFIER
CIRCUIT
The
full-wave
rectifier
circuit
consists
of
winding
3
through
5
Of
transformer
T1,
diodes
CR3
and
CR!4,
resistor
r8
and
fiIter
capacTtor
Cd.
This
circuit
functions
to supply
unregulated
dc
power
to
the
SERIES
REGULATOR
CIRCUIT.
3-3
SERIES
REGULATOR
CIRCUIT
SERIES
REGULATOR
CIRCUIT
FUNCTIONS
AS
A
VARIABLE
RESISTANCE,
CONNECTED
BETWEEN
THE
ONBEGUE.TEO
OC
BOWER
SOORCE
.NO
THE
LORDr^H"
RF^APm
automatically
TO
MAINTAIN
THE
OUTPUT
VOLTAGE
CONSTANT
ARDLESS
OF
CHANGES
IN
LINE, LOAD,
OR
TEMPERATURE.
Th
IS
CIRCUIT
lTsVsrll7)
''''
^^^ns.stor
Q2
(which
acts
as
the
variable
resistance),
driver
transistor
Q1,
amplifier
transistors
03
and
q1|
and
OVEN
ENCLOSED
HIGH
GAIN
DIFFERENTIAL
AMPLIFIERS
Q5
AND^^rcON
tZ
current
generator
transistor
07.
^
'
CONSTANT
Regulating
action
occurs
when
a
change
in
the
output
voltage
is
SENSED
BY
THE
PRECISION
VOLTAGE
DIVIDER
NETWORK
CONSISTING
OF
RESISTORS
R22
HROWCH
R27
.HP
RjS.
ThB
ODTPWT
OB
THE
VOLTAO
DIVIDER
,S
.PRC,ED
TO
THE
BASE
OB
ONE-HALB
OB
OIBBERENTIAL
AMPLIBIER
06.
The
base
of
the
other
half
of
o6
is
held
at
a
fixed
potential
by
FERENCE
ZENER
DIODE
CR9.
TRANSISTOR
07.
IN
THE
EMITTER
CIRCUIT,
OF
Vn
rZT
amplifier
06,
FUNCTIONS
AS
A
CONSTANT
CURRENT
GENERATOR
TO
COMPENSATE
FOR
CHANGES
IN
OF
06
AND
SLIGHT
CHANGES
IN
ZENER
n?iynr,°'
^'^^SES
AN
UNBALANCED
CON-
ouIZ
T
amplifier
which
results
in
an
"error"
voltage
OUTPUT.
The
error
voltage
is
further
amplified
by
differential
amplifier
0!°"
^
decrease
in
output
voltage
was
sensed,
the
output
F
05,
applied
to
the
base
of
amplifier
transistor
Qk,
WOULD
GO
MORE
POSITIVE,
decreasing
THE
CONDUCTION
OF
Q4
PROPORTIONALLY.
ThE
DECREASED
wyTRj^PP
r
amplifier
transistor
Q3
less
positive
npiwro
^
ITS
EMITTER,
CAUSING
A
DECREASE
IN
THE
CONDUCTION
OF
Q3.
Driver
transistor
Q1
receives
its
bias
and
operating
voltage
from
the
AUXILIARY
SUPPLY.
ThE
DECREASED
CONDUCTION
OF
Q3
CAUSES
THE
BASE
OF
Q1
TO
BE
BIASED
MORE
POSITIVE
WITH
RESPECT
TO
THE
EMITTER,
RESULTING
IN
INCREASED
CONDUCTION.
AN
INCREASE
IN
CONDUCTION
OF
Q1
RESULTS
IN
AN
increase
in
the
conduction;
of
series
PASS
TRANSISTOR
Q2.
The
increase
in
-5-
6oit-x336
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X336
SECTION
I
I
I
(cont'd)
CONDUCTION
(decrease
IN
THE
COLLECTOR-TO-EMITTER
RESISTANCE)
OF
Q2,
BEING
PROPORTIONAL
TO
THE
DECREASE
IN
OUTPUT
VOLTAGE^
RESULTS
IN
THE
OUTPUT
VOLTAGE
BEING
HELD
CONSTANT.
3-4
CURRENT
LIMITER
CIRCUIT
The
CURRENT
LIMITER
PREVENTS
DAMAGE
TO
THE
POWER
SUPPLY
FROM
OVERLOADS
OR
SHORT
CIRCUITS.
ThE
CIRCUIT
CONS
ISTSj
BASICALLY,
OF
DIODES
CR7
AND
CR8.
WHEN
AN
OVERLOAD
OR
SHORT
CIRCUIT
IS
PLACED
ACROSS
THE
OUTPUT
OF
THE
SUPPLY,
DIODES
CR7
AND
CR8
BECOME
FORWARD
BIASED
AND
BYPASS
THE
DRIVE
FROM
Q1»
ThIS
ACTION
CAUSES
THE
BASE
OF
SERIES
PASS
TRANSISTOR
Q2
TO
BECOME
LESS
POSITIVE
THAN
ITS
EM-
MITTER
and
Q2
cuts
OFF.
WHEN
THE
OVERLOAD
OR
SHORT
CIRCUIT
IS
RE
MOVED,
CR7
and
CR8
become
BACK-BIASED,
RESTORING
CONTROL
OF
SERIES
PASS
TRANSISTOR
Q2
TO
THE
SERIES
REGULATOR.
3-5
AUXILIARY
SUPPLY
The
AUXILIARY
SUPPLY
PROVIDES
BIAS
AND
OPERATING
VOLTAGES
FOR
DRIVER
TRANSISTOR
01
AND
AMPLIFIER
TRANSISTOR
Q3.
ThE
CIRCUIT
CON
SISTS
OF
WINDING
6
THROUGH
8
OF
TRANSFORMER
T1,
FULL-WAVE
RECTIFIER
DIODES
CRT
AND
CR2,
FILTER
CAPACITOR
C1,
RESISTORS
Rl
THROUGH
R3,
AND
ZENER
DI
DOES
CR5
AND
CRo.
RESISTOR
R2
AND
ZENER
DIODE
CR5
DROP
AND
REGULATE
THE
30'1
VOLT
DC
OUTPUT
VOLTAGE
OF
THE
FULL-WAVE
BRIDGE
TO
20
VOLTS
TO
PROVIDE
COLLECTOR
VOLTAGE
FOR
Q1.
RESISTOR
R3
AND
ZENER
DIODE
CRo
PROVIDE
A
REGULATED
5~V0LT
OUTPUT
FOR
THE
OPERATION
OF
Q3
AND
THE
BI
AS
ING
OF
Q1
.
-6-
6o4-x336
X336
SECTION
iV
MAINTENANCE
GENERAL
No
SPECIAL
OR
PERIODIC
MAINTENANCE
OF
THE
POWER
SUPPLY
IS
REQUIRED.
Under
normal
operating
conditions,
the
power
supply
should
give
trouble-
free
SERVICE
FOR
MANY
YEARS.
This
section
contains
disassembly
instructions
and
troubleshooting
INFORMATION,
SHOULD
MAINTENANCE
OF
THE
POWER
SUPPLY
BE
NECESSARY.
^-2
DISASSEMBLY
To
DISASSEMBLE
THE
POWER
SUPPLY
FOR
INSPECTION,
TROUBLESHOOTING
OR
REPAIR,
PROCEED
AS
FOLLOWS:
A.
Loosen
the
four
screws
securing
the
cover
to
the
mounting
plate
AND
LIFT
OFF
COVER.
ThE
AMPLIFIER
BOARD
ASSEMBLY
IS
NOW
EXPOSED
FOR
INSPECTION
OR
TROUBLESHOOTING
PUTPOSES.
B.
To
REMOVE
THE
AMPLIFIER
BOARD
ASSEMBLY,
REMOVE
THE
TWO
SCREWS
SECURING
THE
AMPLIFIER
BOARD
TO
THE
RIGHT-ANGLE
MOUNTING
BRACKETS.
ThE
BOARD
NOW
MAY
BE
MOVED
ABOUT
(ON
ITS
HARNESs)
FOR
REPAIR.
NOTE
When
soldering
or
unsoldering
any
semi-conductor
COMPONENTS,
A
HEATSINK
MUST
BE
USED
TO
AVOID
THERMAL
DAMAGE.
A
LONGNOSE
PLIERS
APPLIED
BETWEEN
THE
SEMI
CONDUCTOR
and
the
solder
joint
is
generally
ADEQUATE.
C.
To
REMOVE
THE
OVEN
BOARD
ASSEMBLY,
LOOSEN
THE
THREE
SCREWS
SECURING
THE
OVEN
COVER
TO
THE
OVEN
BASE,
ROTATE
COVER
CCW
SLIGHTLY,
AND
REMOVE
COVER.
LoOSEN
THE
TWO
SCREWS
SECURING
THE
INNER
COVER
AND
REMOVE
COVER.
ThE
OVEN
BOARD
ASSEMBLY
PLUGS
INTO
A
SOCKET
AT
THE
BASE
OF
THE
OVEN
IN
THE
SAME
MANNER
AS
A
TUBE.
REMOVE
THE
OVEN
BOARD
ASSEMBLY
AND
THE
FIBERGLASS
PACKING.
Do
NOT
DISCARD
PACKING.
IMPORTANT
NOTE
If
a
MALFUNCTION
IS
LOCALIZED
TO
THE
OVEN
BOARD
AS
SEMBLY,
DO
NOT
ATTEMPT
REPAIR;
REPLACE
THE
ENTIRE
OVEN
board
assembly.
Oven
board
assembly
components
are
matched
and
trimmed
during
the
factory
acceptance
TEST
and
should
NOT
BE
REPLACED
INDIVIDUALLY.
4-3
TROUBLESHOOTING
4-4
GENERAL
-
A
rapid
method
of
fault
isolation
is
that
of
voltage
measure
ments
AT
THE
CIRCUIT
COMPONENTS.
A
SCHEMATIC
DIAGRAM
FOLLOWING
THIS
SECTION
-7-
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