ScintiPack™ Model 296 Photomultiplier Base with
Contents
1. 5 5 SESS SR eM Ae wA 6 5 1 FACIORY REPAIR SERVICE 5 ntt a 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 equipment 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 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 Instruction2. 91512 TE 81513 22 R1612 Sa amp 3025F RI T9 d diD Dynodas 155 12 d anode R1636 la internal connection RtB47 07 g gid 48 07 k zatie Tabs Figure 1 JEDEC 614 38 PMT Pin Base with Pin Asskgnanents auttm Se Brpusist HI Glee Hepes HEOR Y Figure 2 Simplified Schematic Magram of tha Medal 296 Photervulilpller Base 2 SPECIFICATIONS 2 1 PERFORMANCE 2 1 1 PMT BIAS Cathode to Anode Voltage Adjustable from 600 V to 1100 V grounded cathode positive anode with feedback regulation Bias Distribution 1 12 of the cathode to anode voltage is applied between the cathode and focus electrode the focus electrode and the first dynode each pair of dynodes and between the tenth dynode and the anode Voltages on dynodes 8 9 and 10aretransistor regulated for improved stability at high counting rates Temperature Sensitivity The cathode to anode voltage changes 100 ppm C over the operating temperature range of 0 to 50 Bias Voltage Decay Time Nominally 3 minutes when the HV switch is turned off 2 1 2 PREAMPLIFIER Output Polarity Positive Output Rise Time 100 ns for a fast pulser at the TEST input or for a fast scintillator Output Decay Time Constant Nominally a 50 15 exponential time constant Conversion Gain Typically 1 UV eV or 6 UV eV jumper selectable for a 3 in x 3 in Nal TI crystal and a PMT
3. Intended for driving a 50 O coaxial cable terminated in 50 TEST IN With the internal jumper set to TEST IN the rear panel BNC connector is connected to the preamplifier test input Input impedance is nominally 93 in parallel with 83 pF PREAMP rear panel BNC connector delivers the preamplifier output signal for applications where a separate signal cable is desired The same signal is also available on pin 3 of the power cable connector for systems that accommodate a single cable connection to the spectroscopy amplifier Both outputs have a common ac coupled 93 O output impedance and are short circuit protected The signal from dynode 10 is integrated on a 500 pF capacitor at the preamplifier input amplified by the preamplifier gain and presented as a positive polarity pulse at the PREAMP output PMT SOCKET TRW 3B14 Fits the standard JEDEC B14 38 photomultiplier tube pin base for 14 pin 10 stage PMTs See Figures 1 and 2 for pin assignments 2 4 ELECTRICAL AND MECHANICAL POWER REQUIRED 12 V AT 20 mA Supplied via a captive power cord terminated in a standard preamplifier power plug 9 pin D connector Power cord length is nominally 3 m The preamplifier power plug is compatible with the standard preamplifier power connector provided on most nuclear spectroscopy amplifiers The preamplifier output signal is also delivered on pin 3 of this connector for use with the ORTEC ACE An optional Signal Break Out A
4. TUBE BASE tis Power Gable Z3pCADAPT Preamp 2 NOMAD Amp input Preamp Powar Sax P NOMAD Arp gut Figura d Made 240 PMT Connection te NOMAD PHOTONLULTIELIER za TUBE 296 Power Cable PULSE HEIGHT Figure 5 Model 248 PMT Base Connection lo a Typical Amplilier 5 MAINTENANCE 5 1 FACTORY REPAIR SERVICE This instrument can be returned to the ORTEC factory for service and repair at a nominal cost Our standard procedure for repair ensures the quality control and checkout that are used for a new instrument Always contact ORTEC Customer Service at 865 482 4411 before sending an instrument for repair to obtain shipping instructions and so that the required Return Authorization Number can be assigned to the unit Write this number on the address label and on the package to ensure prompt attention when it reaches the ORTEC factory
5. gain of 10 Output Noise 300 UV RMS Measured using and ORTEC Model 671 Amplifier under the following conditions HV on no PMT installed X6 pre amplifier gain and a 1 Us amplifier shaping time constant Integral Nonlinearity lt 0 1 from 0 to 6 5 V into a 1 load measured via the TEST input Maximum output is 7 V into an open circuit or 3 V into a 93 O load Overall linearity depends on the nonlinearity of the scintillator photomultiplier combination Specifications subject to change without notice Temperature Sensitivity Gain changes 550 ppm C from 0 to 50 C measured via the TEST input Overall temperature sensitivity depends the scintillator photomultiplier combination and the bias supply Spectrum Shift Limited by the photomultiplier Typically 2296 shift of the 662 keV peak position from a Cs source for a change in counting rate form 0 to 100 000 counts s in the entire spectrum Measured using an ORTEC Model 671 Amplifier set to a 0 5 Us shaping time constant and an ORTEC Model ACE 4K W3 Multichannel Analyzer Spectrum Broadening Limited by the scintillatior photomultiplier combination Typically 1096 broadening of the FWHM of the 662 keV peak from Os source for a change in counting rate from 0 to 100 000 counts s Measured under the same conditions as Spectrum Shift 2 2 CONTROLS AND INDICATORS HV Rear panel 22 turn potentiometer provides adjustment of the HV bias vol
6. 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 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 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 unneces
7. ScintiPack Model 296 Photomultiplier Base with Preamplifier and High Voltage Power Supply Operating and Service Manual WARNING This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause interference to radio communications As temporarily permitted by regulation it has not been tested for compliance with the limits for Class A computing devices pursuant to subpart J of Part 15 of FCC Rules which are designed to provide reasonable protection against such interference Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be required to correct the interference Printed in U S A ORTEC Part No 762890 1202 Manual Revision D 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
8. as a positive polarity pulse at the PREAMP output A jumper on the printed circuit board allows selection of a preamplifier gain of X1 or X6 The preamplifier output signal can be accessed on pin 3 of the power connector or at the BNC connector on the rear panel of the ScintiPack The anode signal is available on a rear panel BNC connector to facilitate high resolution timing in coincidence measurements This output is intended to drive a 50 O coaxial cable to a timing amplifier or a timing discriminator By moving a jumper on the printed circuit board the anode output connector can be converted to a test input for the preamplifier A pulser can be applied to the test input to check the operation of the entire chain of electronics starting from the preamplifier input The PMT socket is a standard JEDEC B14 38 socket that fits 10 stage photomultiplier tubes with 14 pins Figure 1 defines the pin assignments and Figure 2 illustrates the connections The Model 296 ScintiPack Photomultiplier Base is compatible with the photomultiplier tubes listed in Table 1 Compatibility with tubes not listed in Table 1 can be checked by reference to Figures 1 and 2 and by comparison with the photomultipliers listed in the table Tabla 1 Compatible Tubes Burie formerly ACA Hamamatsu Philipa 4500 PMSS 2 2 5819 A208 R550 XP2412B 555534 RSB4 SB3DUEE S83013F Rara 19 1507
9. ccomplishes all signal interfacing with ScintiPack via the preamplifier power connector The optional Signal Break Out Adaptor can be used with amplifiers that do not offer signal interfacing through the preamplifier power plug The adaptor attaches to the preamplifier power plug at the amplifier and supplies the preamplifier signal on a coaxial cable for connection to the front panel input of the amplifier This approach maintains a single cable connection from the ScintiPack to the amplifier location The ScintiPack biases the cathode of the associated photomultiplier tube at ground potential and the anode at a positive voltage The voltage applied to the anode can be optimized within the range of 600 V to 1100 V via a 20 turn screwdriver adjustment This provides a cost effective means of adjusting and matching photomultiplier gains in large arrays of scintillation detectors The dynode bias network applies 1 6 of the anode voltage between the cathode and first dynode and 1 12 of the anode voltage between the remaining pairs of electrodes To provide excellent gain stability at high counting rates the voltages applied to dynodes 8 9 and 10 are transistor regulated Feedback regulation is also applied to the anode voltage to achieve optimum gain stability for the entire photomultiplier tube The signal from dynode 10 is integrated on a 500 pF capacitor at the preamplifier input amplified by the preamplifier gain and presented
10. daptor is available for extracting the preamplifier signal at the power connector WEIGHT Net 0 5kg 1 1 Ib Shipping 1 2 kg 2 6 Ib DIMENSIONS 5 6 cm 2 2 in diameter x 17 cm 6 7 in length 2 5 OPTIONAL ACCESSORIES 296 ADAPT SIGNAL BREAK OUT ADAPTOR Connects to the end of the power cable from the Model 296 and separates the preamplifier signal cable from the power cable The 9 pin D connector on the adaptor plugs into the standard preamplifierr power connector on the rear of most spectroscopy amplifiers The 60 cm long preamplifier signal cable from the adaptor terminates in a BNC connector for connection to the input of a spectroscopy amplifier C 24 12 93 0 coaxial cable for connecting the PREAMP output to an amplifier input Not necessary when the Model 296 is used with the or when the 296 ADAPT is employed RG 62A U 93 0 cable 3 7 m length with two BNC connectors 25 12 50 0 coaxial cable for connecting the ANODE output to timing instruments RG 58 U 50 0 cable 3 7 m length with two BNC connectors 3 INSTALLATION 3 1 SETTING THE HIGH VOLTAGE The only adjustment on the ScintiPack PMT Base is the HV control which adjusts the high voltage output from 600 V to 1100 V Before applying power to the unit 1 Adjust the HV potentiometer fully counter clockwise this is a 22 turn pot 2 Connect a digital voltmeter to the HV test jack and ground 3 Push the ON button on the
11. l analyzer function is provide by the NOMAD The standard system configuration using a conventional shaping amplifier and MCA is shown in Figure 5 A 93 O coaxial cable connects the preamplifier output signal to the amplifier input The Model 296 ADAPT Signal Break Out Adaptor shown in Figure 4 can also be used in Figure 5 4 2 PREAMPLIFIER GAIN The preamplifier has provisions for two gain settings Jumper W2 on the preamplifier PWB selects either X1 or X6 preamplifier gain In the X1 position the preamplifier has a conversion gain of nominally 1 UV eV In the X6 position conversion gain is nominally 6 UV eV These numbers are typical for a 3 in x 3 in Nal TI crystal and a PMT gain of 109 The ScintiPack is shipped in X1 position 4 3 ANODE OR TEST BNC The ANODE or TEST BNC on the rear panel allows access to the anode output for use in timing applications or connections of an external pulser to the preamplifier input Jumper W2 the preamplifier PWB selects either anode output or test pulser input When the jumper is in the ANODE OUT position the anode output signal is present at the rear panel connector The anode is internally terminated in a 1 kO impedance with ac coupling to the anode When the jumper is in the TEST IN position test pulses from an external pulser can be fed to the preamplifier This input is internally terminated with 930 The ScintiPack is shipped in the ANODE OUT position PHOTOMULTIFLER zo
12. nced Measurement Technology Inc All other trademarks used herein are the property of their respective owners CONTENTS WARRANTY 3 ewertheECeE ERSKT a Ribas Sieh EPBREPRERERUCRERRERERR E ERE ERE ERE ERE ERR ii SAFETY INSTRUCTIONS AND SYMBOLS 0 0 0 iv SAFETY WARNINGS AND CLEANING INSTRUCTIONS sssseeee e II TLSDESCRIPTION S IMPIUM PUE prep our ou gru prd ed ue ds 1 2 SPECIFICATIONS E 3 2 1 PERFORMANCE 3 2 1 1 PMI BIAS ROGER REOR siete CORR OURUUX UROUR ROMA GR NR UA UR ene es 3 2 02 PREAMPLIFIER uersus psv cuve er quus quu ee ee ee ee qu e qe e 3 2 2 CONTROLS AND INDICATORS see eh 3 2 3 INPUTS AND OUTPUTS Suv 4 2 4 ELECTRICAL AND e 4 2 5 OPTIONAL ACCESSORIES 4 Se INSTALLATION tenere eee Ree MN NEUEN 4 3 1 SETTING THEHIGH VOETAGE aia edhe beh 4 4 OPERATION UU EUM UM M S UMS 5 41 SYSTEM CONNECTION tact ntc nct nce Races nca oua E aat M tat M ac tec 5 4 2 PREAMPLIFIER GAIN pope ELE eS EE 5 4 39 ANOBDE OHR O AD IIE IIN
13. rear panel to apply power to the ScintiPack The digital voltmeter should indicate approximately 0 600 V The DVM reading is the actual high voltage divided by one thousand The 0 600 V reading indicates the high voltage is adjusted to 600 V 4 Slowly increase the high voltage by adjusting the HV potentiometer clockwise until the desired high voltage is obtained One the steps outlined in this section are performed the unit is ready for connection to the system 4 OPERATION CAUTION REMOVAL OF THE SCINTIPACK MODEL 296 COVER EXPOSES COMPONENTS THAT OPERATE AT VOLTAGES UP TO 1100 V ALWAYS UNPLUG THE CAPTIVE CABLE FROM THE POWER SOURCE TURN THE POWER OFF AND WAIT AT LEAST 3 MINUTES FOR THE HIGH VOLTAGE TO DISCHARGE BEFORE REMOVING THE COVER 4 1 SYSTEM CONNECTION ScintiPack is suitable for a variety of spectroscopy applications Three of the most often used systems are illustrated Figure 3 shows ScintiPack connected directly to the ORTEC LACE card and computer via the captive cable on the ScintiPack This configuration is very convenient since the preamplifier output and power connections are made through a single cable eliminating multiple cable connections The multichannel analyzer function is provided by the HACE card A portable spectroscopy system is shown in Figure 4 The ScintiPack is connected to the ORTEC NOMAD using the captive cable and the Model 296 ADAPT Signal Break Out Adaptor The multichanne
14. s 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 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 Allow the instrument to dry completely before reconnecting it to the power source vi o ORTEC ANODE OR TEST RERMP ORTEC ScintiPack Model 296 Photomultiplier Base with Preamplifier and High Voltage Supply 1 DESCRIPTION The ScintiPack Photomultiplier Base Model 296 includes everything neededfor scintillation detectors in one compact package a low power adjustable high voltage supply an active bias network and a spectroscopy preamplifier Incorporating the bias supply in the photomultiplier base eliminates high voltage cable connections to bulky external HV supplies As a result ScintiPack operates with extremely low power consumption 240 mW This makes the ScintiPack attractive for portable applications as well as for high density detector arrays Because the preamplifier output signal is bundled into the power cable only a single cable is required between the photomultiplier base and the main amplifier location For example the ORTEC Analyzer a
15. sary 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 warranty 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 is a registered trademark of Adva
16. tage from 600 V to 1100 V The adjacent test jack permits monitoring of the actual bias voltage with a digital voltmeter A digital voltmeter reading of 1 000 V corresponds to an actual bias voltage of 1000 V The output impedance of the test jack is 14 ON Rear panel push button switch turns on the preamplifier and HV bias power when depressed Pushing a second time releases the button and turns the power off X1 X6 A two position jumper located on the preamplifier printed circuit board selects the preamplifier gain to be X1 or X6 Shipped set to X1 ANODE OUT TEST IN A two position jumper located on the preamplifier printed circuit board selects the function of the rear panel ANODE or TEST connector With the jumper in the ANODE OUT position the anode signal is routed to the BNC connector for timing applications Testing of the preamplifier function can be accomplished by moving the jumper to the TEST IN position and applying an external pulser to the rear panel connector Shipped in the ANODE OUT position 2 3 INPUTS AND OUTPUTS ANODE OR TEST Rear panel BNC connector functions as either the anode output for timing applications or as a test input for inserting test pulses into the preamplifier input See ANODE OUT TEST IN jumper description ANODE OUTPUT With the internal jumper set to ANODE OUT the negative polarity anode signal is ac coupled to the rear panel BNC output with an output impedance of 1
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