ORTEC 403 User manual
PRECISION
INSTRUMENTATION
FOR
RESEARCH
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Oak
Ridge
Technical
Enterprises
Corporation
OAK
RIDGE,
TENNESSEE
>K'
INSTRUCTION
MANUAL
MODEL
403
TIME
PICKOFF
CONTROL
w
INSTRUCTION
MANUAL
MODEL
403
TIME
PICKOFF
CONTROL
Serial
No.
Purchaser
Date
Issued
OAK
RIDGE
TECHNICAL
ENTERPRISES
CORPORATION
P.O.
BOX
C
OAK
RIDGE,
TENNESSEE
Telephone
(615)
483-8451
TWX
(810)
572-1078
IS
Oak
Rtdg*
Technical
Enterpriiet
Corporation
1966
Prlntod
In
U.S.A.
J
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'
liability
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
liabilities
associated
with
the
methods
of
installation,
or
installation
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.
ORTEC®
^
MODEL
403
0
TtME
MCKOFF
CONTROL
DISC.
LEVEL
INPUT
OUTPUT
A
!
iiD
^
Q
TABLE
OF
CONTENTS
Page
WARRANTY
PHOTOGRAPH
1.
DESCRIPTION
1
2.
SPECIFICATIONS
1
3.
INSTALLATION
INSTRUCTIONS
1
3.1
Linear
Output
Signal
Connections
and
Terminating
Impedance
2
4.
OPERATING
INSTRUCTIONS
3
5.
CIRCUIT
DESCRIPTION
3
6.
MAINTENANCE
INSTRUCTIONS
3
6.1
Testing
Performance
3
6.2
Calibration
Adjustments
3
6.3
Troubleshooting
Suggestions
3
SCHEMATIC
403-0401-S
Model
403
Schematic
Diagram
i
''
MODEL
403
TIME
PiCKOFF
CONTROL
1.
DESCRIPTION
The
AAodel
403
Time
Pickoff
Control
is
a
single
width
standard
module,
8.75
inches
high.
It
furnishes
itl2V
do
supply
voltage
and
a
discriminator
level
control
current
to
a
AAodel
260
Time
Pickoff
via
a
multiconductor
shielded
cable.
The
fanout
buffer
in
the
AAodel
403
accepts
the
negative
0.5-volt
output
pulse
from
its
associated
AAodel
260,
and
presents
at
OUTPUT
A
a
negative
0.5-volt
pulse,
buffered
from
the
input
by
an
emitter
follower.
At
OUTPUT
B
it
presents
either
a
negative
0.5-volt
pulse,
buffered
by
on
emitter
follower,
or
a
positive
2-volt
signal.
The
AAodel
403
receives
its
power
from
a
AAodel
402
power
supply
via
a
standard
bin,
ORTEC
AAodel
401.
2.
SPECIFICATIONS
Input
Fast
Negative
signal,
0.5V,
50
ohms
input
im
pedance,
from
AAodel
260
Outputs
Two,
Fast
Negative,
0.5V,
^2
nsec
rise
time,
~5
ohms
source
impedance,
width
nom
inally
20
nsec;
One,
positive,
4V,
nominal
500
nsec
width,
rise
time
^10
nsec
Connectors
Input
and
Output
Signals
—BNC,
UG-
1094/U.
Power
and
Bias
to
AAodel
260
Time
Pickoff—
Amphenol
126—198
Cables
Between
AAodel
403
and
AAodel
260
Signal
—
50-ohm
coaxial
cable,
BNC
connec
tors,
customer-furnished
Power
and
Bias
—
ORTEC
Type
260-C1,
50
feet
long,
ordered
separately.
Additional
lengths
may
be
connected
in
series.
Power
Required
70
mA
at
+1
2V,
110
mA
at
—12V,
including
requirements
of
associated
AAodel
260
Time
Pickoff;
furnished
from
AAodel
401
Bin.
Size
Standard
single
width
module
(1.35
inches
wide),
per
TID-20893
Weight
Net
—
1.8
pounds
(0.82
kg);
gross
—
3.8
pounds
(1.7
kg)
3.
INSTALLATION
INSTRUCTIONS
Connect
the
AAodel
260
control
cables
(260-Cl)
between
J-3
of
the
AAodel
403
and
P-3
of
the
corresponding
AAodel
260.
Connect
50-ohm
coaxial
cable
between
the
output
of
the
AAodel
260
and
the
INPUT
connector
(CN-1)
of
the
Time
Pickoff
Control
on
the
front
panel.
Selection
of
the
polarity
of
output
B
may
be
accomplished
by
placing
the
jumper
wire
(SI)
between
the
appropriate
pair
of
jacks
on
the
fanout
buffer
board.
(The
units
are
shipped
with
the
jumper
in
the
positive
position.)
3.1
Linear
Output
Signal
Connections
and
Terminating
Impedance
Considerations
The
source
impedance
of
the
0-10
volt
standard
linear
outputs
of
most
400
Series
modules
is
approximately
1
ohm.
Interconnection
of
linear
signals
is,
thus,
non-critical
since
the
input
impedance
of
circuits
to
be
driven
is
not
important
in
determining
the
actual
signal
span,
e.g.,
0-10
volts,
de
livered
to
the
following
circuit.
Paralleling
several
loads
on
a
single
out
put
is
therefore
permissible
while
preserving
the
0-10
volt
signal
span.
Short
lengths
of
interconnecting
coaxial
cable
(up
to
approximately
4
feet)
need
not
be
terminated.
However,
if
a
cable
longer
than
approximately
4
feet
is
necessary
on
a
linear
output,
it
should
be
terminated
in
a
resistive
load
equal
to
the
cable
impedance.
Since
the
output
impedance
is
not
purely
resistive,
and
is
slightly
different
for
each
individual
module,
when
a
certain
given
length
of
coaxial
cable
is
connected
and
is
not
terminated
in
the
characteristic
impedance
of
the
cable,
oscillations
will
generally
be
observed.
These
oscillations
can
be
suppressed
for
any
length
of
cable
by
properly
terminating
the
cable
either
in
series
at
the
sending
end
or
in
shunt
at
the
receiving
end
of
the
line.
To
properly
terminate
the
cable
at
the
receiving
end,
it
maybe
necessary
to
consider
the
input
impedance
of
the
driven
circuit,
choosing
an
additional
paral
lel
resistor
to
make
the
combination
produce
the
desired
termination
resistance.
Series
terminating
the
cable
at
the
sending
end
may
be
preferable
in
some
cases
where
re
ceiving
and
terminating
is
notdesirable
or
possible.
When
series
terminat
ing
at
the
sending
end,
full
signal
span,
i.e.,
amplitude,
isobtainedat
the
receiving
end
only
when
it
is
essentially
unloaded
or
loaded
with
an
impedance
many
times
that
of
the
cable.
This
may
be
accomplished
by
inserting
a
series
resistor
equal
to
the
characteristic
impedance
of
the
ca
ble
internally
in
the
module
between
the
actual
ampiifier
output
on
the
etched
board
and
the
output
connector.
It
must
be
remembered
that
this
impedance
is
in
series
with
the
input
impedance
of
the
load
being
driven,
and
in
thecase
where
the
driven
load
is900ohms,
a
decrease
in
the
signal
span
of
approximately
10%
will
occur
for
a
93-ohm
transmission
line.
A
more
serious
loss
occurs
when
the
driven
load
is
93ohms
and
the
transmis
sion
system
is
93
ohms.
In
this
case,
a50%
loss
will
occur.
BNCconnec
tors
with
internal
terminators
are
available
from
a
number
of
connector
manufacturers
in
nominal
values
of
50,
100,
and
lOOOohms.
ORTEC
stocks
in
limited
quantity
both
the
50
and
100
ohm
BNC
terminators.
The
BNC
terminators
are
quite
convenient
to
use
in
conjunction
with
a
BNC
tee.
i
'
1
"
4.
OPERATING
INSTRUCTIONS
The
only
control
associated
with
the
Model
403
is
the
DISC.
LEVEL
adjustment
(R14)
which
varies
the
bias
current
to
the
tunnel
diode
discriminator
in
the
Time
Pickoff
(Model
260).
Adjustment
of
this
control
is
explained
in
the
instruction
manual
tor
the
Model
260.
5.
CIRCUIT
DESCRIPTION
(See
Schematic
Diagram^
The
Model
403
furnishes
power
and
controls
the
discriminator
bias
current
to
one
Model
260
Time
Pickoff,
and
furnishes
a
fanout
of
3
for
the
output
pulse
from
the
Model
260.
Output
A,
from
CN-2,
is
emitter-follower
buffered
from
the
input
by
Ql.
Output
B,
from
CN-3,
may
be
a
negative
signal,
emitter-follower
buffered
by
Q2,
or
a
positive
signal
of
4V
amplitude,
depending
on
the
position
of
the
jumper,
51,
on
the
fanout
board.
Signal
choices
for
Output
C,
from
CN-4,
are
the
same
as
for
Output
B.
Q3
is
a
grounded
base
amplifier
that
drives
the
one-shot
multivibrator
formed
by
Q4
and
Q5.
The
pulse
from
the
multivibrator
is
presented
at
Output
B
or
C
via
the
emitter
follower,
Q7.
6.
MAINTENANCE
INSTRUCTIONS
6.1
Testing
Performance
The
operation
of
the
discrimination
level
control
(R14)
is
dependent
upon
the
Model
260,
and
is
described
in
the
instruction
manual
for
the
Model
260.
The
fanout
buffer
may
be
tested
either
with
the
output
pulse
from
the
Model
260,
or
with
a
50-ohm
pulse
generator.
If
the
Model
260
is
used,
set
up
the
system
as
described
in
section
6
of
the
manual
for
the
Model
260.
The
output
from
the
Model
260
should
be
approximately
0.5V
in
amplitude
with
a
rise
time
^1.2
nanoseconds.
This
rise
time
may
be
degraded
by
the
connecting
cable
be
tween
the
output
of
the
Model
260
and
the
input
of
the
Model
403.
The
out
puts
may
be
monitored
on
any
oscilloscope
that
has
sufficient
bandwidth
to
observe
the
waveform.
The
user
should
be
reminded
that
rise
times
for
am
plifiers
normally
fold
together
by
the
square
law,
i.e.,
Tr
=
(Tn'^
+
Tr2^)"^;
however,
coaxial
cable
rise
times
cannot
be
folded
into
the
response
in
this
manner.
6.2
Calibration
Adjustments
There
are
no
calibration
adjustments
except
for
power
supply
adjustments
which
are
explained
in
the
instruction
manual
for
the
Model
402
Power
Supply.
If
the
user
desires
to
monitor
the
discriminator
bias
current,
this
may
be
ac
complished
by
placing
a
voltmeter
across
R13,
a
100-ohm
resistor,
and
moni
toring
the
voltage
developed.
6.3
Troubleshooting
Suggestions
6.3.1
Symptom:
No
output
pulse
at
OUTPUT
A
(CN-2)
First
check
for
the
presence
of
an
input
pulse.
If
an
input
pulse
is
present,
check
Ql.
(The
input
pulse
should
be
negative.)
4
6.3.2
Symptom:
No
output
pulse
at
OUTPUT
B
(CN-3)
Check
for
an
input
pulse.
If
on
input
pulse
is
present,
be
sure
that
CN-4
on
the
rear
panel
is
terminated
in
50
ohms.
Check
jumper
wire
SI.
If
jumper
wire
31
is
in
the
negative
position,
check
Q2.
If
the
jumper
wire
is
in
the
positive
position,
measure
the
dc
voltages
and
compare
them
with
those
listed
in
table
1
of
this
manual.
If
the
volt
ages
are
within
tolerances,
check
Q2
through
Q7.
6.3.3
Symptom:
Noise
on
the
output
baseline,
with
no
input
pulse
(a)
Check
for
a
ground
loop
between
the
monitoring
scope
and
the
Model
403.
(b)
If
a
length
of
coaxial
cable
is
connected
to
the
input
of
the
Model
403
and
left
open-circuited
at
the
other
end,
it
is
a
reso
nating
circuit
for
any
noise
generated
by
the
input
circuit,
and
therefore
forms
an
oscillator
from
the
buffer
amplifier.
This
condition
should
not
be
allowed
to
exist.
Table
1.
Fanout
Buffer
Board
—DC
Voltage
Measurements
Check
Point
Min
Max
-1-12
Bus
+
11.8
+
12.2
-12
Bus
-11.8
-12.2
-
6
-
5.4
-
6.0
Ql-E
•
O
+
+
0.85
Q2-E
+
0.6
+
0.85
Q3-C
-
9.5
or
•
o
1—
1
1
Q5-B
-
5.2
-
6.0
Q5-C
-
5.6
-
6.2
Q7-E
-
0.3
00
•
o
1
All
measurements
mode
with
respect
to
ground
with
vtvm.
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
Spore
Bus
25
Reserved
4
Reserved
Bus
26
Spare
5
Coaxial
27
Spore
6
Coaxial
*28
+24
volts
7
Coaxial
*29
—24
volts
8
200
volts
dc
30
Spore
Bus
9
Spare
31
Carry
No.
2
♦10
+6
volts
32
Spore
*11
—6
volts
*33
115
volts
ocC^^O
12
Reserved
Bus
*34
Power
Return
Ground,
13
Carry
No.
1
35
Reset
14
Spore
36
Gate
15
Reserved
37
Spore
*16
+12
volts
38
Coaxial
*17
—12
volts
39
Coaxial
18
Spore
Bus
40
Coaxial
19
Reserved
Bus
*41
115
volts
oc
(Neut.)
20
Spore
*42
High
Quality
Ground
21
Spore
G
Ground
Guide
Pin
22
Reserved
♦These
pins
are
installed
and
wired
in
parallel
in
the
ORTEC
Model
401
Modular
System
Bin.
I
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.
k
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