Model 9302 Amplifier-Discriminator Operating and Service Manual
Contents
1. 1 6 015 8 5 6 IC3 9 0 8 E 6 3 1C3 15 1 6 021 8 0 05 1C316 1 6 E 0 75 1C3 3 0 8 022 8 0 25 IC3 8 5 2 E 0 75 IC4 14 5 0 023 B 5 6 IC4 7 0 E 6 0 1C5 4 5 0 024 B 5 3 IC5 11 0 E 6 0 5 APPLICATIONS There are a number of different applications for the 9302 Amplifier Discriminator However since the unit was designed primarily for ion electron and photon counting system block diagrams for this type of usage are given Figure 5 1 is ablock diagram of asystem that might be used to perform atomic or molecular fluorescence measurements Pulses from the photomultiplier tube are applied to the 9302 where they are first amplified Following amplification the pulses enter the discriminator section of the 9302 where those pulses whose amplitudes correspond to photons are accepted Pulses that correspond to interdyode noise are of a lower voltage amplitude and are rejected The discriminator output is then applied to the ORTEC 9349 Log Lin Ratemeter The 9349 measures the average count rate of the input pulses and also provides an analog output for the y deflection of the x y recorder An analogous application to low level light measurements is ion counting This technique can be applied to mass spectrometry and has the same sensitivity advantages with an electron or ion multiplier that are obtained by other detectors such as photomultiplier tubes A typical system that could be used is shown in Fig 52. TID 20893 3 INSTALLATION 3 1 GENERAL Since the 9302 in conjunction with an ORTEC 4001A 4002A Bin and Power Supply is intended for rack mounting vacuum tube equipment operating in the same rack must be sufficiently cooled with circulating air to prevent any localized heating of the all transistorized circuitry used throughout the 9302 The temperature of equipment mounted in racks can easily exceed the recommended maximum limit of 120 F 50 C unless these precautions are taken 3 2 CONNECTION TO POWER The 9302 contains no internal power supply and must obtain the necessary dc operating power from the 4001A 4002A Bin and Power Supply in which itis installed for operation Always turn off power on the Power Supply before inserting or removing modules The ORTEC 9000 Series of modular instruments is designed so that the Power Supply cannot be overloaded when there is a full complement of modules in the Bin Since however this may not be true when the Bin contains modules other than those of ORTEC design use the convenient test points on the front panel of the 4001 A 4002A to check each Power Supply voltage level after all modules have been inserted 3 3 INPUT OUTPUT CONNECTIONS The low input impedance 50Q and low output impedance 50Q of the 9302 permit it to be used in a system using only 50Q cable The low output impedance requires that the output cable be terminated by the characteristic impedance of the ca
3. TS ieai ktn tE a tate hatch kids ease ls de rasa E ati 2 2 5 ELECTRICAL AND MECHANICAL aana 2 3 INSTALLANON sis ss A S su 2 3 1 GENERAL Guisos n staba akas kas kas ele desk Mn nes thee ee aa at 2 9 2 CONNECTION TO POWER x sists e 2 3 3 INPUT OUTPUT CONNECTIONS 1 aaa 2 4 MAINTENANCE ss accede tee pee a ee ele jas j EEEE 3 4 1 CORRECTIVE MAINTENANCE aaa 3 4 2 FACTORY REPAIR SERVICE 0 tne 3 5 sAPPEIGA TIONS zee ss Ea 3 SAFETY INSTRUCTIONS AND SYMBOLS This manual contains up to three levels of safety instructions that must be observed in order to avoid personal injury and or damage to eguipment or other property These are DANGER Indicates a hazard that could result in death or serious bodily harm if the safety instruction is not observed WARNING Indicates a hazard that could result in bodily harm if the safety instruction is not observed CAUTION Indicates a hazard that could result in property damage if the safety instruction is not observed Please read all safety instructions carefully and make sure you understand them fully before attempting to use this product In addition the following symbol may appear on the product ATTENTION Refer to Manual DANGER High Voltage Please read all safety instructions carefully and make sure you understand them fully before attempting to use this product SAFETY WARNINGS AND CLEANING INSTRUCTIONS DANGER Opening the cover of this instrument
4. 2 9302 AMPLIFIER DISC 9201 PMT BASE MONOCHROM ATOR 9349 LOG LIN RATEMETER 456 HIGH VOLTAGE POWER SUPPLY Y Deflection X Deflection x Y RECOROER 8124 Fig 5 1 Block Diagram of a Typical 1 MHZ Ratemeter System 9302 AMPLIFIER DISCRIMINATOR 9301 9315 m ELECTRON MULTIPLIER PREAMPLIFIER COUNTER 9325 456 Analog Output HIGH VOLTAGE POWER SUPPLY DIGITAL TO ANALOG CONVERTER j B124 Fig 5 2 lon Counting System with Digital and Analog Outputs LINE PRINTER Bin Module Connector Pin Assignments For Standard Nuclear Instrument Modules per DOE ER 0457T Y 5 Function 3 V 3V Spare bus Reserved bus Coaxial Coaxial Coaxial 200 V dc Spare 10 6V 11 6V 12 Reserved bus 13 Spare 14 Spare 15 Reserved 16 12V 17 12V 18 Spare bus 19 Reserved bus 20 Spare 21 Spare 22 Reserved OO ONOGROD 41 Function Reserved Reserved Reserved Spare Spare 24 V 24V Spare bus Spare Spare 117 Vac hot Power return ground Reset Scaler Gate Reset Auxiliary Coaxial Coaxial Coaxial 117 Vac neutral High guality ground Ground guide pin Pins marked are installed and wired in ORTEC s 4001A and 4001C Modular System Bins
5. Printed in U S A Model 9302 Amplifier Discriminator Operating and Service Manual ORTEC Part No 733690 Manual Revision C 1202 Advanced Measurement Technology Inc a k a ORTEC a subsidiary of AMETEK Inc WARRANTY ORTEC warrants that the items will be delivered free from defects in material or workmanship ORTEC makes no other warranties express or implied and specifically NO WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ORTEC s exclusive liability is limited to repairing or replacing at ORTEC s option items found by ORTEC to be defective in workmanship or materials within one year from the date of delivery ORTEC s liability on any claim of any kind including negligence loss or damages arising out of connected with or from the performance or breach thereof or from the manufacture sale delivery resale repair or use of any item or services covered by this agreement or purchase order shall in no case exceed the price allocable to the item or service furnished or any part thereof that gives rise to the claim In the event ORTEC fails to manufacture or deliver items called for in this agreement or purchase order ORTEC s exclusive liability and buyer s exclusive remedy shall be release of the buyer from the obligation to pay the purchase price In no event shall ORTEC be liable for special or consequential damages Quality Control Before being approved for shipment each ORTEC instrument mu
6. ble at the remote cable end 4 MAINTENANCE 4 1 CORRECTIVE MAINTENANCE The ORTEC 9302 should reguire no regular maintenance other than replacement of components that have failed due to age Always ensure that the replacement components are eguivalent to the original parts designated in schematic 9302 0101 S1 No internal trimming or adjustment is necessary with the 9302 To aid in the identification of a malfunctioning component typical stage by stage dc voltages are shown in Table 4 1 These voltages are typical values and may vary through a narrow range without indicating a fault 4 2 FACTORY REPAIR SERVICE This instrument can be returned to the ORTEC factory for service and repair at anominal cost Our standard procedure for repair ensures the same quality control and checkout that are used for a new instrument Always contact the Customer Service Department at ORTEC 865 483 2231 before sending in an instrument for repair for shipping instructions and so that the required Return Authorization Number can be assigned to the unit This number should be written on the address label and on the package Table 4 1 dc Bias Points Nominal Values Test Point Voltage V Voltage V QI B 0 026 8 1 2 E 0 7 E 1 5 02 B 0 028 8 1 2 E 0 7 E 1 5 04 B 0 7 1C1 10 1 25 E 0 1C1 11 1 25 05 8 0 1C1 14 1 2 E 0 7 1C1 15 1 6 Q6 B 0 1C1 2 1 6 E 0 7 1C1 3 0 8 08 8 0 7 1C3 12 1 1 E 0 103013
7. d to perform external switching when the pulse counting rate is modulated At counting rates above those set by the front panel selector switch a voltage of greater than 2 0 V will be present at the signal monitor connector At counting rates below the rate selected 0 0 2 V will be present at the signal monitor connector 1 2 INPUT SIGNALS The input signals are dc coupled into an impedance of 50Q The maximum amplitude range of the amplifier to retain linearity is 50 mV when the gain switch is set at X20 and is 5 mV when the gain switch is set at X200 Protection is provided for input voltages of up to 100 V at a 10 duty cycle 1 3 OUTPUTS The linear amplifier output connector is located on the rear panel of the module and has an output impedance of 500 Use of this output requires 500 coaxial cable and 50Q termination Two discriminator output connectors are also located on the rear panel of the module They are isolated from each other and produce a negative current pulse of 16 mA into a 50Q load impedance The output pulse width is lt 5 0 ns The rear panel signal monitor connector produces a positive dc voltage when the counting rate after the discriminator is greater than the rate selected on the front panel for the monitor rate discriminator When the counting rate is below the selected rate 0 0 2 V appears at the signal monitor output 2 SPECIFICATIONS 2 1 PERFORMANCE AMPLIFIER Voltage Range 0 to 50
8. is likely to expose dangerous voltages Disconnect the instrument from all voltage sources while it is being opened WARNING Using this instrument in a manner not specified by the manufacturer may impair the protection provided by the instrument Cleaning Instructions To clean the instrument exterior Unplug the instrument from the ac power supply Remove loose dust on the outside of the instrument with a lint free cloth e Remove remaining dirt with a lint free cloth dampened in a general purpose detergent and water solution Do not use abrasive cleaners CAUTION To prevent moisture inside of the instrument during external cleaning use only enough liquid to dampen the cloth or applicator e Allow the instrument to dry completely before reconnecting it to the power source vi mh k 2302 AMPLIFIER DISCRI MIN ATOR GAIN 200 DISC LEVEL m iY MONTOR TES J m TEST POINTS AMPF DISC MON 200 ORTEC MODEL 9302 AMPLIFIER DISCRIMINATOR 1 DESCRIPTION 1 1 GENERAL The ORTEC 9302 is a fast amplifier and discriminator in a single wide NIM standard module designed for use with photomultiplier or electron multiplier tubes in photon ion or electron counting applications Features of the 9302 include a wideband high gain amplifier and an integral discriminator capable of counting rates up to 100 MHZ Incorporated in the module is a rate monitor system that can be use
9. mV Rise Time Typically 3 0 ns Noise lt 10 UV for maximum gain Gain Switch selectable X20 or X200 Nonlinearity lt 1 Temperature Instability Gain lt 0 1 C dc drift lt 50 UV C DISCRIMINATOR Threshold Range 50 mV to 1 V Walk lt 2 0 ns from X2 to X20 threshold Pulse Pair Resolution lt 10 ns 9 ns typically 2 2 CONTROLS Gain Slide switch for selection of X20 or X200 Disc Level Multiturn control adjusts the discriminator level from 50 mV to 1 V Monitor Rate Disc Front panel potentiometer selects 1 kHz 10 kHz 100 kHz or 1 MHZ which determines the rate above which a logic level will be produced 2 3 INPUT Amplifier In BNC connector on rear panel accepts negative input signals protected to 100 V at 10 duty factor Z 50 2 4 OUTPUTS Amp Out Rear panel BNC connector provides linear analog output Z 50Q Disc Out 2 independent BNC connectors on rear panel provide negative current pulse of 16 mA into 500 width lt 5 ns rise time 1 5 ns Signal Mon BNC connector on rear panel provides O 0 2 V when discriminator count rate is below threshold and gt 2 0 V when it is above threshold Preamp Power Amphenol type 17 10090 connector on rear panel provides necessary power for 9301 Fast Preamplifier 2 5 ELECTRICAL AND MECHANICAL Power Required 24V 90 mA 12V 205 mA 24V 85mA 12V 140 mA Dimensions NIM standard single width module 1 35 by 8 714 in per
10. ranty should follow the same procedure and ORTEC will provide a quotation Damage in Transit Shipments should be examined immediately upon receipt for evidence of external or concealed 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 please notify ORTEC of the circumstances so that assistance can be provided in making damage claims and in providing replacement equipment if necessary Copyright 2002 Advanced Measurement Technology Inc All rights reserved ORTEC is a registered trademark of Advanced Measurement Technology Inc All other trademarks used herein are the property of their respective owners CONTENTS MARRAS ii SAFETY INSTRUCTIONS AND SYMBOLS aaa iv SAFETY WARNINGS AND CLEANING INSTRUCTIONS aaa v 1 DESCRIPTION act a e ene eh ek A E A a a a E A ee a IA AA 1 del GENERAL 2 i dd dd dd da add od o al at a lo ate 1 12 1INPUT SIGNALS eat tl ss dit std ss inst sist A A ALA dita dot t sat dl ds 1 1 3 OUTPUTS iz autas sists S ss ss ss Ss S Sa Se 1 2x ORECIFICATIONS ig said a dan ee 1 21 PERFORMANCE aaan a a i E ap aa ja ji gs g ij aij ai aij 1 id CONTROLS Ceca is Reto Kapi asie adidas dd dl i Rutt une Ral ds 1 23 INPUT g ese T a pod Pa ote T sa P E e E tears 2 ad OTRU
11. st 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 If it becomes necessary to return this instrument for repair it is essential that Customer Services be contacted in advance of its return so that a Return Authorization Number can be assigned to the unit Also ORTEC must be informed either in writing by telephone 865 482 4411 or by facsimile transmission 865 483 2133 of the nature of the fault of the instrument being returned and of the model serial and revision Rev on rear panel numbers Failure to do so may cause unnecessary delays in getting the unit repaired The ORTEC standard procedure requires that instruments returned for repair pass the same quality control tests that are used for new production instruments Instruments that are returned should be packed so that they will withstand normal transit handling and must be shipped PREPAID via Air Parcel Post or United Parcel Service to the designated ORTEC repair center The address label and the package should include the Return Authorization Number assigned Instruments being returned that are damaged in transit due to inadequate packing will be repaired at the sender s expense and it will be the sender s responsibility to make claim with the shipper Instruments not in war
Download Pdf Manuals
Related Search