NUCLEAR DATA ND509 User manual

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11
F1TT4i
I
1

NUCLEAR
DATA, INC.
Golf
and Meocham
Roads
Schaumburg,
lIlinos
60172
August,
1975
1M86-502
1-00
INSTRUCTION
MANUAL
ND509
PREAMPLIFIER,
AMPLIFIER,
DISCRIMINATOR
Copyright
1975,
by Nuclear
Data, Inc.
Printed
in U.S.A.

WARRANTY
Nuclear
Data warrants
its products to be free from
defects in workmanship and
materials for a period
of
twelve
months from date
of shipment, provided that the
products have
been used
in a
manner consistent
with
good practice,
and not subjected
to abuse, modificatioh
or alteration. Repair or
replacement will
be
made at Nuclear
Data’s option without
charge.
Shipping
expense
to
Nuclear
Data
will
be borne by
the
customer;
Nuclear
Data
will absorb
charges
on return shipment.
All peripheral equipment
associated
with Nuclear Data
products and not
manufactured
by
Nuclear
Data is
subject
only
to the warranty
stated
by the
supplying manufacturer.
Nuclear
Data
reserves
the right to modify or alter the
design of ifs products
at its
option without
incurring
responsibility for modification of previously manufactured
products.
Nuclear Data does
not assume any risk
or liabilities
for
any handling or conditions
beyond
our control.
DAMAGE IN
TRANSIT
Shipments
should
be examined immediately upon receipt.
IF
evidence
of damage
is
found, the carrier
making delivery should be notified at once and a
report of the
damage made; since
the carrier is normally liable for damage
in
shipment.
Waybills
and other
documentation, including packing
materials,
should be
preserved to aid in
establishing claims.
Nuclear
Data
should also be notified
of
the circumstances
so
that
we may
assist
in
establishing
the
claim
and
in providng, if
necessary,
replacement
equipment.
QUALITY CONTROL
Each Nuclear
Data instrument
is
required to
pass a severe
and rigid series
of quality
tests
prior
to approval for shipment.
These
tests are designed to
expose
any flaws
in
materials or workmanship.
Permanent records of these tests are filed in our Customer
Service Department for use
in
warranty
control and as a source of statistical information.
SERVICE
Nuclear
Data instruments not
in
warranty
may be returned to
the factory
for repairs or
checkout at
modest expense to the customer. Out—of—warranty instruments
serviced at
our factory
are required
to
pass the
same quality control
standards as those used
for
new production instruments.
We
request that you
contact
our Customer
Service
Department for instructions
prior to shipping any equipment.
A

CONTENTS
TITLE
PAGE
GENERAL DESCRIPTION
1
TECHNICAL
SPECIFICATIONS
1
INSTALLATION
AND OPERATION
2
General CorisideratTons
2
Connection to Power
2
FUNCTIONAL DESCRIPTION
3
Preamplifier
3
Amplifier
3
Discrminator
3
SCHEMATIC DIAGRAM
4

GENERAL
DESCRIPTION
Nuclear
Data’s
ND509
contains
a
charge sensitive preamplifier,
a gain
of 400
linear
amplifier
and an
integral
discriminator.
The
gain and
pulse
shaping
time
constants
have been
optimized
for
scintillation
counting. The
ND509
is
ideally
suited
for
applications
ranging
from
simple
scintillation
counting
systems
to
multiple
detector
multiplex
systems
where routing
is required.
The
preamplifier—amplifier
section
accepts
the
negative
charge
output
of
scintillation
detectors
and
provides
a positive
RC
clipped
(1
pec)
output
voltage
pulse.
Output
pulse shape
and
gain
are
independent
of detector
capacitance
and Interconnecting
cable length.
The
discriminator
provides
a +6V,
500
nsec
wide pulse
for
all
amplifier
output
signals
which
exceed
its threshold.
A single
turn
front
panel
potentiometer
varies discriminator
threshold
over
a
100
mV
to
1OV
dynamic
range.
TECHNICAL
SPECIFICATIONS
I
Input:
Front panel
BNC
(UG
1094
A/U)
accepts
negative
charge
signals
from
scintillation
and gas
proportional
counters.
Outputs:
AMP
OUT
— Front
panel
BNC
(UG
1094
A/U)
provides
pOsitive
monopolar
output,
cc
coupled,
from
50
ohms
impedance.
Dynamic
range
is
+12
V
saturated,
+10
V
linear.
DISC
OUT
- Front
panel
BNC
(UG
1094
1 A/U)
provides
a
+6
V,
500 nsec wide
pulse
for all
amplifier
output
pulses
that exceed
the
desired
threshold.
Impedance
is
50
ohms
and
is
dc
coupled
ground
referenced.
Controls:
Coarse
Gain
—
Front
panel
swtch
32:1
range
in
2:]
steps.
Fine
Gain —
Front
panel
single
turn
potentiometer
provides
2:1
range.
Threshold
— Front
panel
single
turn
potentiometer
selects
from 100
mV
to
JOV
sensitivity.
Charge
Gain:
12
V/picocoulomb.
I
Gain
Stability:
0.015%/°C.\
Rise
Time:
150
nsec.
Pulse
Shaping:
1.Opsec
single
RC
clipped.

Integral
Linearity:
0.1%
to
+10
V. 1
Threshold
Stability: 0.1%/°C.
Power
Requirements:
+24
Vdc
@
20 mA.
—24
Vdc
@
20
mA.
+12
Vdc
@
60
mA.
—12
Vdc
@
60
mA.
Dimensions:
8.71
in.
h.’x
1.34
in. w.
x
9.7
in.
d.
(NIM
compatible single
width
module).
Weight:
5
lbs.
Part
Number:
86-5021. 18—Tn.
Signal
Cable
(BNC
to
BNC)
— 86—5081.
INSTALLATION
AND
OPERATION
General Considerations
The
ND509
when
used
in
conjunction
with
the ND152
Instrument
Bin
and
Power
Supply
is
intended
for
rack
mounting
so
care
must
be
taken
to
prevent
localized
heating
of
components.
If vacuum
tube
equipment
is
employed
in the
same
rack
it
s
necessary
to
insure
that air
circulation
provides
sufficient
cooling.
The
temperature
of
rack
mounted
equipment
can
easily exceed
the
recommended
maximum
unless
precautions are
taken.
The
ND509
should
not be
subjected
to
temperatures
in excess
of
50°C.
Connection
to
Power
The
ND509
containing
no
internal
power
supply
must
obtain
power
from
a
standard
NIM bin
and
power supply
such
as
the
ND]52.
It
is recommended
that
the
bin power
supply
be turned off
when
inserting
or
removing
modules.
Nuclear
Data
modules
have
been
designed
so that
it
is not
possible
to
overload
the bin’s
power
supply
with
a
full
complement
of modules
(excluding
high
voltage
supplies)
in
the
bin,
however,
this
may
not be
true
if
the
bin contains
modules
of
other
than
Nuclear
Data
design.
The
ND152
Instrument
Bin
and
Power
Supply
has
test points
on
the
front
panel
to
monitor dc voltages.
When
using
the
ND509
outside
the
bin
and power
supply,
be sure
that
the
jumper
cable
employed
properly
accounts
for the
power
supply
grounding
circuits provided
in accord—
once
with
the
AEC
standard
TID—20893.
A
power
return
ground
connection is
provided
to
insure
proper
reference voltage
feedback
into
the
power
supply,
and
must
be
pre
served
in
remote
cable
installations.
Care
must
also
be
exercised to avoid
ground
loops
when
the
module is not
physically
in the
bin.
2

FUNCTIONAL
DESCRIPTION
In
this
section
of
the
manual
the
circuit operation
of
each
functional
section
of
the
PAD
will
be
discussed.
Reference
to
the instruments’
schematic
is
necessary
at this
time.
Preamplifier
The
charge sensitive
preamplifier
section
consists
of
transistors
Ti
and T2
and
associated
components.
Ti
and T2
form
an
inverting feedback
pair
in
which
the feed—
back
element
is
a
capacitance
(C5).
The
input
to Ti
appears
as
a
virtual ground,
such
that all the
input
current
charges
C5
the feedback
Capacitor.
The
output
voltage
pulse
appearing
at
the emitter
of
T2
has a
magnitude
equal
to
input
charge
(Q)
divided
by
feedback
capacitance
(33
pfl,
or
30 mV/picocoulomb.
The
output
of
T2
drives
the
main
amplifier
through
the
coarse
gain
attentuator
switch
Si.
The
output
pulse
shape
of
the
preamplifier
is
a
positive
tail pulse
with
1
psec tail
time
constant.
The
time
constant
is
set
by R3
and C5.
Amplifier
The
amplifier
portion
of the ND509
consists
of
two
functional groups.
The
first,
afour
transistor
negative
feedback
loop,
provides
gain
selection
via
Si
in
binary
steps
span
ning
the
range
from ito
32.
Cascaded
emitter
followers
T4—T6
buffer
the
inverting
gain
stage
T4
and
provide
low
output
impedance.
The
second
amplifier
section
differs
from
the
first in
that
the
output includes
complimentary
emitter
followers
for
greater
line
driving
capability.
The
gain
of
the
second
feedback
group
is
controlled
by
the
fine
gain
control,
spanning
the
range
from
approximately
5
to
12.
The
output
of
this
group
drives
front
and rear
panel
BNC
connectors
as
well
as
the internal
discriminator.
The
amplifier
section
provides
no
additional
pulse
shaping
such
that
the
output
is
a
positive
1
ppec
tail
pulse.
Discriminator
The
discriminator
section
of
the
ND509
is
short
time
constant
coupled
to
the
main
amplifier
section
via
C26.
The
time
constant
is
approximately
1
psec.
This
short
time
constant
coupling
eliminates
base
line
shift
at
the
discriminator.
Amplitude
discrimination
is
performed
by
ML1,
an
integrated
circuit
comparator,
which compares
the
pulse
presented
to
its input
with the
threshold
voltage
as
set
by
the
front
panel
threshold
control.
All
signals
which
exceed
threshold
appear
as
a
positive
output
at
Pin
9
ofML1
and
are further
amplified
by
NAND
Gate
ML2C.
A
second
dfferentiator
(100
nsec)
couples
this signal
to
the
shaping
mono
ML2
A
&
D.
The
monostable
period
is
set
by
C30 and
the
current
source
comprised
of
R64
and R65
to
approximately
1
p5ec.
This
rectangular
pulse
inverted
by
ML2B
and
buffered
by
T12,
appears
at
the
front
and
rear
panel
discriminator
outputs
as
a
positive
6
V,
1
}.isec
pulse.
Operating
voltage
for
the
integrated
circuits
in
the
discriminator
is
provided
by Tl3
and its
associated
voltage
divider.
T13
provides
the
5
V
power
necessary
for
their operation.
3

IV
F,
R51
FACT
ADJ.
UNLESS
OTHEIWISE
NOTED:
RESISTORS
1/4W
5%
CAPACItORS, VALUES
LESS
THAN 1.0
IN
MICROFARADS
ALUES
GREATER
THAN 1.0
IN PICOFARADS.
FOLARIZED CAPACITORS
IN
MICROFARADS.
(
INDICATES
I
METAL
FILM
RESISTOR.
DIODES
1N914.
ML2
IS
SN74OCN.
4-5V
PIN
14. GNO
PIN
7.
LINDICATES
FRONT
PANEL
LOCATION.
DISC
OUT
@INOICATE1.
REAR
PANEL
LOCATION.
LAST
NO
USED:
R75,
C35.
02.
T13,
.15.
ML2, SI,
P1.
ULZC
—3
P11 NO.
ELEMENT
NO.
IkTEGRATED CKT.
—CHARGE
IN
J
‘33
+24V
F
R19
t-IZVF 2
T5
ZN
3694
41A
S.
—IZV
F 2
1T6
ZN 3645
— 24VF 3
+24V
—24V
—12VF 3
29
T7
N
412
2
1-
12
V
—IZV
16
I?
34
COARSE
GAIN
SI
+IZY F,
RI3
T
470
—IZV
4-12V
1-
4
2VF 3
R
35
I0
—24Y
F 2
TtO
2N3G42
1175
AMP
OUT
47
t
+24VF 2
—24VF 2
+
IZVF 2
—12VF 2
CIiI
R14
CII
I5
CI4f
CI
RI?
I
tO
I
10 j_
to
+-24V
—24V -
-+12V
—I2V
— C35
CI 8
10/25
—zi
÷
OUT
1131.
18K
R42
2.711
—12 V
F 3
C26
C27
R67
470
R48
to
POSITIVE
LOGIC
—!2V
470
470
R65
I.-’
— ,2V
- -I-5V
ND509
Schematic
Dicigrcimi
4
.

Nuclear
Data Inc.
Golf and
Meacham
Roads
Schaumburg,
Illinois
60172
Tel:
(312)
885-4700
Nuclear
Data
Inc.
103 Pincushion
Road
Framingham,
Massachusetts
01701
Tel:
(617)
899-4927
Nuclear
Data
Inc.
P.
0.
Box
2192
14278
Wicks
Boulevard
San
Leandro,
California
94577
Tel:
(415)
483-9200
Nuclear
Data Inc.
2335 Brannen Road,
S.
E.
Atlanta,
Georgia
30316
Tel:
(404)
241-3220
Nuclear
Data,
GmbH
Falkensteiner
Strasse
75-77
Frankfurt/Main,
West
Germany
Tel:
590540
Nuclear
Data (Ireland) Ltd.
Kinsale
Road, Ballycurreen
P.
0.
Box
#23
Cork, Ireland
Tel:
25356
Nuclear
Data
(Scandinavia)
Division
of
Selektronik
A/S
Hammervej
3
2970 HrshoIm,
Denmark
Tel:
[phone]
Nuclear
Data
Instruments
AB
Eriksbergsvagen
9
S-752 39 Uppsala,
Sweden
Tel:
[phone]
NUCLEAR
DATA
INC.
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c
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