Nucleonix PA320 User manual
NUCLEONIX SYSTEMS PVT. LTD
I N S T R U C T I O N
M AN U AL
PRE - AMPLIFIER
TYPE : PA320
NUCLEONIX SYSTEMS PRIVATE LIMITED
Plot No : 162 A& B, PHASE II, I.D.A.Cherlapally, Hyderabad - 500 051
File Name :PA320_MAN
Date :20-08-2013
NUCLEONIX SYSTEMS PVT. LTD
CONTENTS
UNPACKING
CHAPTER I INTRODUCTION
CHAPTER II SPECIFICATIONS
CHAPTER III INSTALLATION
CHAPTER IV OPERATION
CHAPTER V BLOCK DIAGRAM & ITS DESCRIPTION
CHAPTER VI CIRCUIT DIAGRAM
NUCLEONIX SYSTEMS PVT. LTD
UNPACKING
Charge sensitive Pre-amplifier Type : PA320 has been thoroughly tested and is despatched in
ready to use condition. However, on unpacking and prior to operation, it is advisable to check
visually and make sure that there is no visible damage caused in transit.
If any damage to the instrument is observed, do not switch ON the unit and report the matter
immediately to :
Customer Support Division
Nucleonix Systems Private Limited
Plot No : 162 A& B, PHASE II,
I.D.A.Cherlapally,
Hyderabad - 500 051.
Ph: 91-040-27263701/30918055, FAX : 27262146,
In all correspondance regarding the instrument, please mention the type, serial number of the
unit, date of issue etc., of the unit.
NUCLEONIX SYSTEMS PVT. LTD
NUCLEONIX Charge sensitive Pre -amplifier PA320 is designed for use with gas filled
proportional counters. Fully solid-state design and has a choice of two gain factors 1 or 3. Its
mechanical construction enables the detector to be directly connected where as the low output
impedance can drive fairly long connecting cable upto the main amplifier.
FEATURES :
❏Compact Solid state circuit design
qSuitable for wide range of x-ray Proportional and gas flow type of detectors.
qRise time 100 nano sec.
qIt is a charge sensitive pre-amplifier uses N-channel FET.
CHAPTER - I
INTRODUCTION
NUCLEONIX SYSTEMS PVT. LTD
Detector Load Resistor :10 M Ohms
Output impedance :100 Ohms
Charge Sensitivity :(0.22x10-12volts/ coulomb. Gain can be set
additionally by a toggle switch to 1 or 3 position.
Rise Time :Better than 100 nano seconds for both polarities of
the signal.
Decay Time Constant :50 micro sec. (approx).
Charge Sensitive Device :N-Channel FET.
Power Supply :-12@ 36mA
CHAPTER - II
SPECIFICATIONS
NUCLEONIX SYSTEMS PVT. LTD
CHAPTER - III
INSTALLATION
A. CONTROLS / CONNECTORS :
EHT (MHV socket) :High Voltage connector, at which the EHT supply is provided
to connect to the X-ray proportional counter / gas proportional
/ He / BF3 / Neutron detector for detector biasing.
Output (BNC) :BNC Co-axial connector at which output from the Pre -
Amplifieris generated for connecting to shaping amplifier.
LV (socket) :Five pin circular connector at which the LV supply voltages
are provided from the NIM instrumentation bin & power supply
unit. Power up the PA320 is fed.
Detector (MHV socket) :MHV connector, to which detector is connected preferably
through as short RG 59 cable. Cable end has to match with
the appropriate connector on the detector.
Test input :This is a BNC socket at which a -ve test tail pulse can be test
injected for testing the pre-amplifier functionality.
B. EXTERNAL CONNECTIONS :
Having connected the Pre-amplifier to the detector as explained earlier, proceed to make
the connection as follows : (Typical x-ray proportional Counting Systems).
1. Using the HV cable connect the OUTPUT from High Voltage Unit, type HV502 /HV503 to
the HV connector (MHV socket) on PA320.
2. Using Co-axial signal cable connect from the OUTPUT BNC connector on PA320 to the
INPUT of any Pulse shaping Amplifier typically LA520 or AF521or Spectroscopy amplifier.
3. Using LV - I/O, 5 core cable connect to the "LV" connector on PA320 to the LV connector
on Instrumentation bin & power supply. If your instrumentation bin has a 9-pin D-connector,
then you wire up one end with 9 pin D-connector & the other end with 5 pin I/O connector
to mote with corresponding connector on pre-amplifier.
NUCLEONIX SYSTEMS PVT. LTD
CHAPTER - IV
OPERATION
A. OPERATING INSTRUCTIONS:
Charge sensitive preamplifier PA320 is designed for connecting directly to any x-ray
proportional counter/ gas proportional detectors, Krypton filled mossbauer detectors, He,
BF3Neutron counters etc. It is essential to have short cable between detector & pre-amplfier
PA320. Ofcourse after passing through the pre-amplifier one needs to amplify the signals
through a proper pulse shaping amplifier. LV cable is connected to PA320 from the NIM bin
& power supply from which LV suppliesare applied to Power up the Pre-amplifier PA320.
HV is applied through a MHV to MHV cable to the preamplifier, typically from a High voltage
unit HV502 unit. Output of the Pre-amplifier us taken to a pulse amplifier such as Linear
Amplifier LA520 or Active Filter Amplifier AF521 or spectroscopy amplifier.
B. CONNECTING CABLES :
1. LV cable (5 pin circular female I/O connector both ends).
2. 'Detector' - MHV to MHV/SHV connector co-axial cable
3. HV cable (MHV male to MHV male cable) between pre-amplifier to High voltage unit.
4. BNC - BNC signal cable (BNC male to BNC male co-axial cable). This output from pre-
amplfier is
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