EG&G ORTEC 403A User manual
I
I
100
MIDLAND
ROAD,
OAK
RIDGE,
TENNESSEE,
37830
Lj
area
code
(615)
483-8451
TWX
810-572-1078
INSTRUCTION
MANUAL
403A
TIME
PICKOFF
CONTROL
AN
EGHGCOMPANY
INSTRUCTION
MANUAL
403A
TIME
PICKOFF
CGNTRGL
Serial
No..
Purchaser.
Date
issued.
INCORPORATED
P.O.
BOX
C
OAK
RIDGE,
TENNESSEE
37830
Telephone
(615)
483-8451
TWX
810-572-1078
©ORTEC
Incorporated
1966
Printed
in
U.S.A.
TABLE
OF
CONTENTS
Page
WARRANTY
PHOTOGRAPH
1.
DESCRIPTION
1-1
2.
SPECIFICATIONS
2-1
3.
INSTALLATION
INSTRUCTIONS
3-1
3.1
Linear
Output
Signal
Connections
and
Terminating
Impedance
Considerations
3-1
4.
OPERATING
INSTRUCTIONS
4-1
5.
CIRCUIT
DESCRIPTION
5-1
5.1
Power
and
Control
Bias
5-1
5.2
Fan-out
Circuit
5-1
6.
MAINTENANCE
INSTRUCTIONS
6-1
6.1
General
Maintenance
Instructions
6-1
6.2
Calibration
Adjustments
6-1
6.3
Troubleshooting
Suggestions
6-1
6.4
Tabulated
Test
Point
Voltages
6-1
7.
BIN/MODULE
CONNECTOR
PIN
ASSIGNMENTS
FOR
AEC
STANDARD
NUCLEAR
INSTRUMENT
MODULES
7-1
BLOCK
DIAGRAM
AND
SCHEMATIC
403A-0101-B1
ORTEC
403A
Block
Diagram
403A-0101-S1
ORTEC
403A
Schematic
STANDARD
WARRANTY
FOR
ORTEC
ELECTRONIC
INSTRUMENTS
DAMAGE
IN
TRANSIT
Shipments
should
be
examined
immediately
upon
receipt
for
evidence
of
external
or
con
cealed
damage.
The
carrier
making
delivery
should
be
notified
immediately
of
any
such
damage,
since
the
carrier
is
normally
liable
for
damage
in
shipment.
Packing
materials,
waybills,
and
other
such
documentation
should
be
preserved
in
order
to
establish
claims.
After
such
notification
to
the
carrier,
notify
ORTEC
of
the
circumstances
so
that
we
may
assist
in
damage
claims
and
in
providing
replacement
equipment
when
necessary.
WARRANTY
ORTEC
warrants
its
electronic
products
to
be
free
from
defects
in
workmanship
and
materials,
other
than
vacuum
tubes
and
semiconductors,
for
a
period
of
twelve
months
from
date
of
ship
ment,
provided
that
the
equipment
has
been
used
in
a
proper
manner
and
not
subjected
to
abuse.
Repairs
or
replacement,
at
ORTEC
option,
will
be
made
without
charge
at
the
ORTEC
factory.
Shipping
expense
will
be
to
the
account
of
the
customer
except
in
cases
of
defects
discovered
upon
initial
operation.
Warranties
of
vacuum
tubes
and
semiconductors,
as
made
by
their
manufacturers,
will
be
extended
to
our
customers
only
to
the
extent
of
the
manufacturers'
l
iabi
l
ity
to
ORTEC.
Specially
selected
vacuum
tubes
or
semiconductors
cannot
be
warranted.
ORTEC
reserves
the
right
to
modify
the
design
of
its
products
without
incurring
responsibility
for
modification
of
previously
manufactured
units.
Since
installation
conditions
are
beyond
our
control,
ORTEC
does
not
assume
any
risks
or
liabi
l
ities
associated
with
the
methods
of
instal
lation,
or
instal
lation
results.
QUALITY
CONTROL
Before
being
approved
for
shipment,
each
ORTEC
instrument
must
pass
a
stringent
set
of
quality
control
tests
designed
to
expose
any
flaws
in
materials
or
workmanship.
Permanent
records
of
these
tests
are
maintained
for
use
in
warranty
repair
and
as
a
source
of
statistical
information
for
design
improvements.
REPAIR
SERVICE
ORTEC
instruments
not
in
warranty
may
be
returned
to
the
factory
for
repairs
or
checkout
at
modest
expense
to
the
customer.
Standard
procedure
requires
that
returned
instruments
pass
the
same
quality
control
tests
as
those
used
for
new
production
instruments.
Please
contact
the
factory
for
instructions
before
shipping
equipment.
—
-ym
:fr
ORTEC^
I
v[5m<"'EL403a3
DISC.
LEVEL
DISC.
INPUT
NEG.
OUTPUT
1
NEG
OUTPUT
2
POS.
OUTPUT
3
L'
1
-1
ORTEC
403A
TIME
PICKOFF
CONTROL
DESCRIPTION
The
403A
Time
Pickoff
Control
provides
control
and
fan-out
buffering
for
time
derivation
units
such
as
the
260, 264,
and
268.
Dc
supply
voltages
and
a
dis
criminator
level
control
current
for
the
time
derivation
unit
are
provided
via
a
multiconductor
shielded
cable.
The
fan-out
buffer
accepts
the
Type
I
(fast
negative)
logic
signal
from
the
time
derivation
and
derives
from
it
three
separate
output
signals.
Two
are
Type
I
logic
and
one
is
Type
I
I
logic
(slower
positive).
The
403A
receives
its
power
from
an
ORTEC
401A/402A
Bin
and
Power
Supply.
2
-
1
2.
SPECIFICATIONS
Input
Signal;
0.3V
minimum
(protected
to
±
1GOV)
(This
signal
conforms
to
the
Preferred
Practices
of
TID-20893
(Rev.)
and
is
normally
the
output
signal
from
the
260
Time
Pickoff,or
264,
or
268
Photomultiplier
Timing
Discriminator
and
Pre
amplifier)
Input
Impedance:
50
ohms
±
1
0%,
dc
Input
-
Output
Count
Rote:
100
MHz
maximum
(fast
negative)
Outputs:
Output
1
:
Fast
logic,
negative,
15
mA
on
50
ohms,
current
drive,
^.5
nsec
for
input
signal
of
2X
threshold,
output
pulse
width
~
width
of
input
signal
at
250
mV
level,
amplitude
limited
at~1.5V
when
unterminated,
dc-coupled
Output
2:
Same
as
1
above
Output 3:
Slow
logic,
positive,
5V,
T^
^10
nsec,
width
~0.5
nsec,
<10
ohms
Connectors:
Signal
:
BNC
Power
and
Bias:
Amphenol
126-198
Power
Connection
Coble:
The
appropriate
connecting
cable
is
furnished
with
the
260
Time
Pickoff
and
264
or
268
Photomultiplier
Discriminator
and
Preamplifier
Power
Required:
+24V
15
mA
+12V
15
mA
-24V
35
mA
-12
V
40
mA
3
-
1
3.
INSTALLATION
INSTRUCTIONS
3.1
General
The
ORTEC
403A,
used
in
conjuncMon
wifh
the
ORTEC
401A/402A
Bin
and
Power
Supply,
is
intended
for
rock
mounting,
ond
therefore
it
is
necessory
to
ensure
thot
vocuum
tube
equipment
operoting
in
the
some
rock
hos
sufficient
cooling
oir
circuloting
to
prevent
ony
locolized
heoting
of
the
oll-tronsistor
circuitry
used
throughout
the
403A.
The
temperoture
of
equipment
mounted
in
rocks
con
eosily
exceed
the
recommended
moximum
unless
precoutions
ore
token.
The
403A
should
not
be
subjected
to
temperotures
in
excess
of
120°F
(50°C).
3.2
Connection
to
Power
—
AEC
Stondord
Nucleor
Instrument
Module,
ORTEC
401A/402A
The
403A
contoins
no
internol
power
supply,
ond
therefore
must
obtoin
power
from
o
Nucleor
Stondord
Bin
ond
Power
Supply
such
os
the
401A/402A.
It
is
recommended
thot
the
Bin
power
supply
be
turned
off
when
inserting
or
removing
modules.
The
ORTEC
400
Series
is
designed
so
thot
it
is
not
possible
to
over-
lood
the
Bin
power
supply
with
o
full
complement
of
modules
in
the
Bin;
however,
this
moy
not
be
true
when
the
Bin
contoins
modules
other
thon
those
of
ORTEC
design.
In
this
cose,
power
supply
voltoges
should
be
checked
ofter
the
inser
tion
of
modules.
The
401A/402A
hos
test
points
on
the
power
supply
control
pone
I
to
monitor
the
dc
voltoges.
3.3
Connection
to
Time
Derivotion
Unit
Insert
the
403A
into
the
401A/402A.
Connect
the
time
derivotion
unit
(ORTEC
260,
264,
etc.)
to
the
403A
by
the
oppropriote
control
coble,
260-Cl
or
260-C2.
This
coble
is
provided
with
the
time
derivotion
unit.
Connect
o
50-ohm
cooxiol
coble
between
the
output
of
the
time
derivotion
unit
ond
the
input
of
the
403A.
The
outputs
of
the
403A
moy
now
be
connected
to
the
desired
inputs
ond
the
system
should
be
reody
for
operotion.
4-
1
4.
pPERATING
INSTRUCTIONS
The
only
two
controls
associated
with
the
403A
are
the
DISC
ZERO
adjustment
R11,
and
the
DISC
LEVEL
control
R12.
The
DISC
LEVEL
control
varies
the
threshold
in
the
associated
time
deriviation
unit.
The
DISC
ZERO
adjustment
provides
a
means
of
normalizing
the
DISC
LEVEL
at
one
set-point.
Normally
this
set-point
will
be
that
of
maximum
sensitivity,
for
which
the
adjustment
procedure
is:
1.
Monitor
output
#3
of
the
403A
with
an
appropriate
oscilloscope.
2.
Set
the
DISC
LEVEL
control
R12
to
0.0.
3.
Adjust
the
DISC
ZERO
control
R11
clockwise
until
output
signals
appear
(indicating
self
triggering
of
the
time
derivation
unit),
4.
Turn
Rll
counter
clockwise
just
enough
to
cause
the
signals
to
disappear.
The
system
is
now
adjusted
for
maximum
sensitivity.
5-
1
5.
CIRCUIT
DESCRIPTION
(See
Drawings
403A-0101-S1
and
403A-0101-B1)
5.
1
Power
and
Control
Bias
The
403A
furnishes
the
power
and
control
bias
for
a
time
derivation
unit
by
direct
access
via
the
bias
and
power
output
jack
(J2).
5.2
Fan-out
Circuit
The
input
signal
to
the
403A
is
regenerated
in
the
fan-out
circuit
to
produce
three
separate
outputs.
The
input
signal
passes
through
the
current
limiter
circuit
composed
of
IC-1
and
D3
to
the
input
of
the
dc
coupled
amplifier
composed
of
Ql,Q2,
and
Q3.
The
output
current
signal
from
Q3
col
lec
tor
triggers
the
tunnel
diode
D4
from
the
low
state
to
the
high
state.
It
wi
l
l
remain
in
the
high
state
until
the
input
signal
decreases
to
less
than
250
mV.
The
voltage
signal
from
D4
drives
the
two
fast
output
current
switches
Q5-Q6
and
Q8-Q9
via
two
emitter
fol
lowers
Q4
and
QIC.
These
switches
drive
15
mA
of
current
on
Outputs
1
and
2.
A
signal
is
also
derived
from
the
col
lector
of
QIC
which
triggers
the
trigger
pair
Q11-Q12.
This
trigger
pair
generates
a
positive
signal
of
approximately
5V,
500
nsec
wide.
Q13
is
a
cutoff
emitter
fol
lower
which
is
driven
into
the
conduction
state
by
this
5V
signal
and
thereby
presents
this
signal
to
Output
3.
6-
1
6.
MAINTENANCE
INSTRUCTIONS
6.1
General
Maintenance
Instructions
The
operation
of
the
DISC
LEVEL
control
is
a
simple
shorting
rheostat
in
series
with
a
current
sensitive
device
which
exists
in
the
associated
time
derivation
device,
e.g.,
ORTEC
260.
The
operation
of
the
DISC
ZERO
control
is
the
same
and
is
covered
in
Section
4
of
this
manual
.
The
fan-out
buffer
may
be
tested
with
a
signal
from
a
pulse
generator
or
from
a
time
derivation
unit.
The
input
signal
is
regenerated
in
the
403A
to
a
standard
output
amplitude,
but
having
a
width
approximately
equal
to
the
input
signal
at
a
level
of
-250
mV.
6.2
Calibration
Adjustments
The
operation
of
the
DISC
ZERO
control
is
covered
in
Section
4
and
is
the
only
calibration
associated
with
the
unit.
6.3
Troubleshooting
Suggestions
In
situations
where
the
403A
is
suspected
of
malfunction,
it
is
essential
to
verify
such
malfunction
in
terms
of
simple
pulse
generator
pulses
at
the
input
and
output.
The
403A
should
be
disconnected
from
its
position
in
the
system
and
routine
diagnostic
analysis
performed
with
a
test
pulse
generator
and
oscil
loscope.
The
guide
plate
and
shield
cover
may
be
completely
removed
from
the
module
to
enable
oscil
loscope
and
voltmeter
observation
with
a
minimal
chance
of
accidental
ly
short-
circuiting
portions
of
the
etched
board.
The
403A
may
be
returned
to
ORTEC
for
repair
service
at
nominal
cost;
our
standardized
procedure
re
quires
that
each
repaired
instrument
receive
the
same
extensive
quality
control
tests
that
a
new
instrument
receives.
6.4
Tabulated
Test
Point
Voltages
The
following
voltages
are
intended
to
indicate
typical
dc
voltages
measured
on
the
etched
circuit
board
as
an
aid
in
troubleshooting.
6-2
Table
of
Typical
Voltage
for
ORTEC
403A
+
24V
buss
23.8
-
24V
buss
23.6
+
12V
buss
1 1
.9
-
12V
buss
n.6
Q1b
+
0.014V
Qle
-
0.74V
Q2e
-
0.67V
Q2c
-
1.02V
Q3c
-
0.0015V
Q4e
-
0.71V
Q5e
-
1
.45V
Q6b
-
0.9V
Q7e
-
0.7V
Q8e
-
1
.45V
Q9b
-
0.71V
Q9c
-
0.73V
QlOe
-
0.71V
Qlle
-
11
.9V
Q12b
-
11
.2V
Q12c
-
0.027V
Q13c
f
11
.9V
BIN/MODULE
CONNECTOR
PIN
ASSIGNMENTS
FOR
AEC
STANDARD
NUCLEAR
INSTRUMENT
MODULES
PER
TID-20893
Pin
Function
Pin
Function
1
+3
volts
23
Reserved
2
—3
volts
24
Reserved
3
Spare
Bus
25
Reserved
4
Reserved
Bus
26
Spare
5
Coaxial
27
Spare
6
Coaxial
*28
+24
volts
7
Coaxial
*29
—24
volts
8
200
volts
dc
30
Spare
Bus
9
Spare
31
Carry
No.
2
«10
+6
volts
32
Spare
*11
—6
volts
*33
115
volts
ac(H°0
12
Reserved
Bus
*34
Power
Return
Ground,
13
Carry
No.
1
35
Reset
14
Spore
36
Gate
15
Reserved
37
Spare
*16
+12
volts
38
Coaxial
*17
—12
volts
39
Coaxial
18
Spare
Bus
40
Coaxial
19
Reserved
Bus
*41
115
volts
ac
(Neut.)
20
Spare
*42
High
Quality
Ground
21
Spare
G
Ground
Guide
Pin
22
Reserved
*
These
pins
are
installed
and
wired
in
parallel
in
the
ORTEC
401A
Modular
System
Bin.
The
transistor
types
installed
in
your
instrument
may
differ
from
those
shown
in
the
schematic
diagram.
In
such
cases,
necessary
replace
ments
can
be
made
with
either
the
type
shown
in
the
diagram
or
the
type
actually
used
in
the
instrument.
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