Model 850 Quad Single-Channel Analyzer Operating and Service
Contents
1. The built in voltmeter is used to read the Window or Upper Level setting LOWER LEVEL Front panel screwdriver potentiometer adjustable from 20 mV to 9 99 V determines the threshold setting for the Lower Level discriminator when the PWB LL Ref mode jumper is set on Int When the LL Ref mode jumper is in the Ext position the control is ineffective INTEGRAL NORMAL WINDOW Two PWB jumpers select one of the three operating modes Integral LL sets a single discriminator threshold 20 mV to 9 99 V and UL is disabled Normal UL and LL are independently adjustable levels 20 mV to 9 99 V Window LL sets the baseline level 20 mV to 9 99 V and UL sets the window width 2 mV to 9 99 V The Digital Voltmeter reading must be divided by 10 to determine the Window setting LL REF MODE A PWB jumper selects either the front panel LL potentiometer or the voltage signal applied to the rear panel LI Ref Ext connector as the LL discriminator reference threshold DIGITAL VOLTMETER Channel Front panel push button to select channel 1 through 4 Front panel red LED indicates the selected channel LL UL Front panel push button selects Lower Level or Upper Level threshold for viewing on the Digital Voltmeter Front panel yellow LED indicates the selected threshold Inaccuracy 1 digit 2 3 INPUTS SIGNAL INPUTS Front panel BNC connector accepts positive unipolar or bipolar signal 0 to 10 V linear range PWB jumper selects either dc or ac2. ae we acc wank ee a A a e e RANO DA Re ke shan E dean saat sear yeas Gear ql sear Upa wear AR PA Me 2 4 OUT O 2 5 RELATED EQUIPMENT 3202 6 an s at ewe aie viet ia aa lala dla L D dt Mla dd d E 2 6 ELECTRICAL AND MECHANICAL 2 6 ELECTRICAL AND MECHANICAL 3 INSTALLATION A ari kt men AS ADD ONO TT O DR T ON OAI ORO R AIX N ka 3 1 CONNECTION TO POWER 4444 e kn a n na nn na nana annan 3 2 CONNECTION FROM LINEAR AMPLIFIER elev venn ven venn ve van nannan 3 3 OUTPUT CONNECTION 155 3 32555 eme toa a E 3 4 LOWER LEVEL REFERENGE INPUT eee eee tele ko e tao 4 OPERATING INSTRUCTIONS Loll el l L Lel n L Lun L luv n nn a n na kn aa n nna ene 5 MAINTENANCE AND CALIBRATION occ Dl GENERAL e alt O ka kana A da Katte Rus RE Pa Pa RA E KO Eos kap Reais eee Reet Rane 5 2 FACTORY REPAIR ed 5 3 TABULATED TEST POINT VOLTAGES 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
3. coupled input For dc coupled input 12 V maximum width gt 100 ns Z 1 kQ For ac coupled input 100 V maximum 0 2 to 10 Us width Z 1 kQ LL REF EXT When the PWB jumper is on Ext the rear panel BNC connector accepts the Lower Level biasing An input of 20 mV to 9 99 V on this connector corresponds to a range of 20 mV to 9 99 V for the Lower Level discriminator setting Input protected to 24 V 2 4 OUTPUTS SCA OUT Front panel BNC connector provides positive NIM standard output nominally 5 V 500 ns wide Z lt 10 Q Output occurs as the trailing edge of linear input crosses the LL threshold LL OUT Rear panel BNC connector provides positive NIM standard output nominally 5 V 500 ns wide Z 10 2 Output occurs as the leading edge of linear input crosses the LL threshold UL OUT Rear panel BNC connector provides positive NIM standard output nominally 5 V 500 ns wide Z 10 Q Output occurs as leading edge of linear input crosses the UL threshold 2 5 RELATED EQUIPMENT The 850 is compatible with all ORTEC amplifiers and other amplifiers having a 0 to 10 V positive linear output range 2 6 ELECTRICAL AND MECHANICAL POWER REQUIRED 12 V 145 mA 12 V 140 mA 6 V 400 mA WEIGHT Net 0 91 kg 2 0 Ib Shipping 2 27 kg 5 0 Ib DIMENSIONS NIM standard single width module 3 43 X 22 13 cm 1 35 X 8 714 in Per TID 20893 Rev 3 INSTALLATION Since the 850 contains no internal p
4. signals are available when the corresponding discriminator is triggered on the leading edge of the input pulse The adjusted Lower Level threshold is furnished either by the front panel Lower Level control or from a dc bias level through the rear panel LL Ref connector the alternate selection is made with the W2 PWB jumper In either case the range is from 20 mV to 9 99 V measured on the analog input pulse The value of the Lower Level threshold can be read using the built in front panel voltmeter The adjusted Upper Level threshold is determined by the setting of the front panel Upper Level control When the 850 is configured in the Window mode the range of the control is from 2 mV to 0 999 V The front panel voltmeter reading must be divided by 10 to obtain the proper value of the DIFFERENTIAL SCA OUT DIFFERENTIAL Window setting When the 850 is configured in the Normal mode the range of the control is from 20 mV to 9 99 V The value of the Upper Level threshold can be read directly by using the built in front panel voltmeter OR INTEGRAL UL OUT i INTEGRAL SCA OUT Fig 4 1 Timing Relationships for Input and Output Pulses 5 MAINTENANCE AND CALIBRATION 5 1 GENERAL The basic performance of the 850 Quad Single Channel Analyzer can be inferred from its operating responses 5 2 FACTORY REPAIR This instrument can be returned to ORTEC for service and repair at a nominal cost Our st
5. NECTION FROM LINEAR AMPLIFIER Each channel of the 850 has a front panel input to be used for the analog signals that are furnished from a linear amplifier The front panel BNC can be set as a dc coupled path or as an ac coupled path using the W1 connector accessible through the side panel The dc coupled path is generally preferred However if there is an dc baseline offset if signal amplitudes exceed the 12 V maximum limit or the dc circuit or if the input pulses decay slowly ac coupling is available by proper setting of the W1 jumper Either input circuit accepts positive unipolar pulses or bipolar pulses the positive lobe will be analyzed into an input impedance of 1 kQ When cables more than 1 5 meters long are used to connect the amplifier output to the 850 input cable termination may be necessary in order to prevent reflections In this case the cable impedance must be matched with a terminator at the 850 input The input operating range is from the Lower Level threshold typically lt 20 mV minimum to 10 V This range is compatible with the range of output pulses that are normally available from NIM modular linear amplifiers and biased amplifiers 3 3 OUTPUT CONNECTION A logic output pulse is available at the front panel BNC connector when input pulses satisfy the amplitude and logic requirements of the 850 When the 850 is set for either differential single channel mode normal or window the logic output pulse indi
6. Printed in U S A Model 850 Quad Single Channel Analyzer Operating and Service Manual ORTEC Part No 688830 Manual Revision D 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 instru
7. 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 L J O O1 P O D 41 Function Reserved Reserved Reserved Spare Spare 24 V 24 V Spare bus Spare Spare 117 V ac hot Power return ground Reset Scaler Gate Reset Auxiliary Coaxial Coaxial Coaxial 117 V ac neutral High quality ground Ground guide pin Pins marked are installed and wired in ORTEC s 4001A and 4001C Modular System Bins
8. andard 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 865 482 4411 before sending in 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 3 TABULATED TEST POINT VOLTAGES The voltages given in Table 5 1 are intended to indicate typical dc levels that can be measured on the PWB In some cases the circuit will perform satisfactorily even though due to component tolerances there may be some voltages that differ slightly from the listed values Therefore the tabulations should not be interpreted as absolute values but are intended to serve as an aid in troubleshooting All voltages in Table 5 1 were measured with no input signal and with the mode jumpers set for Integral mode Table 5 1 Typical dc Voltages Location Voltage 1R1 1R5 junction 5 1R2 1R7 junction 5 1U2 3 0 1U2 11 TTL Low 1U2 13 TTL High 1U3 3 0 1U3 9 TTL High 1U3 11 TTL Low 1U3 13 TTL High 1U4 10 5 1U4 13 TTL Low 1U5 4 TTL High 1U5 6 TTL High 1U5 8 TTL High Q2E 5 TP1 TP2 4 5 TP3 TP2 0 9 Bin Module Connector Pin Assignments For Standard Nuclear Instrument Modules per DOE ER 0457T Y 5 Function 3 V 3 V Spare bus
9. cates that the input pulse amplitude is sufficient to trigger the Lower Level discriminator without also triggering the Upper Level discriminator When the 850 is set for Integral mode of operation the logic output indicates that the input pulse amplitude is sufficient to trigger the Lower Level discriminator Separate logic outputs are available through the rear panel to indicate when on the leading edge of an input pulse each of the two discriminators is triggered These responses can be used to monitor the discriminator levels during adjustment to be counted in external counters or to provide subgroup routing in a multichannel analyzer Each logic output is a NIM standard slow positive pulse that is compatible with all ORTEC counters counting rate meters and other instruments The output impedance of each output is sufficiently low to drive as many as ten paralleled 1 kQ inputs 3 4 LOWER LEVEL REFERENCE INPUT Each channel of the 850 has a PWB jumper to allow selection of an external reference level for the Lower Level discriminator When the LL Ref jumper W2 is set in the Ext position the front panel Lower Level control is disconnected and the reference level must be furnished through the LL Ext Ref connector on the rear panel An input of 0 to 10 V through this connector corresponds directly to a range of 0 to 10 V for the Lower Level discriminator threshold If an input is connected to the LL Ref connector only
10. coupled input Jumper W2 selects the front panel LL potentiometer or the voltage signal applied to the rear panel LL Ref Ext connector as the LL discriminator reference threshold Jumpers W3 and W4 select the mode of operation as either Integral Normal or Window The 850 has an easy to use built in digital voltmeter for setting the Lower Level and Upper Level thresholds of each channel A front panel push button selects which of the four channels is being read A second front panel push button selects either the Lower Level or the Upper Level reading Each threshold can be set over the range from 20 mV to 9 99 V In the Window mode the range of setting is 2 mV to 0 999 V The digital voltmeter reading must be divided by 10 to determine the Window setting The display flashes on overrange INTEGRAL MODE In the Integral mode each channel of the 850 provides an output signal to the Out connector on the front panel if the input pulse amplitude exceeds the adjusted Lower Level threshold The input range is 0 to 10 V For Integral mode operation jumper W3 must be in the Intg Norm position and jumper W4 must be in the Intg position NORMAL MODE In the Normal mode the 850 provides an output pulse to the Out connector on the front panel if the input pulse amplitude exceeds the Lower Level threshold but does not exceed the Upper Level threshold In this mode each threshold is adjusted independently in the range of 20 mV to 9 99 V and t
11. d Single Channel Analyzer has the exceptionally wide dynamic range the stability and the high resolution necessary for use in high resolution HPGe spectroscopy experiments These same features provide more than adequate performance with scintillation counters and ionization chambers Dc coupled input integrated circuit discriminators and logic are employed to obtain these characteristics and to assure maximum performance at high counting rates The 850 accepts either positive unipolar or bipolar input pulses from linear amplifiers that have either active RC or delay line shaping The amplitude of each input pulse is examined and appropriate NIM standard positive logic output pulses are generated separately for SCA LLD and ULD responses The instrument is designed to meet the recommended interchangeability standards of USAEC Report TID 20893 Rev An ORTEC 4001A 402D Bin and Power Supply provides all the necessary power including 6 V through the rear module power connector All signal levels and impedances are compatible with other ORTEC modules 1 2 MODES OF OPERATION The 850 consists of four completely independent channels of single channel analyzer Each channel has a set of four printed wiring board PWB jumpers accessible through the side panel that control the operation of the unit The function of each jumper is labeled on the side panel Channel SCA1 jumpers are labeled W1 through W4 Jumper W1 selects dc or ac
12. he ULD level must be set higher than the LLD level to permit the SCA output to be generated For Normal mode operation jumper W3 must be in the Intg Norm position and jumper W4 must be in the Norm Win position WINDOW MODE In the Window mode the 850 provides an output pulse to the Out connector on the front panel if the input pulse amplitude exceeds the Lower Level threshold but by an amount that is less than the adjusted window width The range of the LLD is 20 mV to 9 99 V and the range of the window is adjusted from 2 mV to 0 999 V above the LLD level This mode is especially adapted to high resolution spectroscopy because the very narrow windows that are required for this type of operation are reproducible and easy to obtain For Window mode operation jumper W3 must be in the Win position and jumper W4 must be in the Norm Win position The SCA output pulses from each channel of the 850 are generated when the trailing edge of the input signal being analyzed crosses the Lower Level threshold provided the LLD and ULD threshold requirements have been met For this reason the 850 cannot be used effectively for crossover timing applications 1 3 LEADING EDGE TIMING Connectors are included on the real panel for LL and UL outputs for each channel of the 850 The pulses that are furnished through these connectors are generated on the leading edge of the input signal each one occurring when the corresponding discriminator is tr
13. iggered by the input pulse amplitude Either of these pulses can be used for timing applications or for pulse routing into a multichannel analyzer In any mode of operation either the LL or the UL output can be used to monitor the number of input pulses that cross the corresponding threshold 1 4 LOWER LEVEL REFERENCE Each channel of the 850 has a PWB jumper W2 that selects either the front panel Lower Level control or the voltage signal applied through the rear panel LL Ext Ref connector as the reference level forthe Lower Level discriminator This permits flexibility in operation when an external reference source can furnish the LLD with a stepped or sliding threshold to automatically sweep the SCA response through a spectral range 2 SPECIFICATIONS 2 1 PERFORMANCE DYNAMIC RANGE 500 1 PULSE PAIR RESOLVING TIME 200 ns plus output pulse width THRESHOLD TEMPERATURE INSTABILITY lt 0 01 C of full scale O to 50 C using a NIM class A power supply referenced to 12 V WINDOW WIDTH INCONSISTENCY 0 196 variation of full scale window width over the linear 0 to 10 V input range DISCRIMINATOR NONLINEARITY lt 0 25 of full scale integral for both discriminators 2 2 CONTROLS WINDOW OR UPPER LEVEL Front panel screwdriver potentiometer determines the window width O to 1 V in the Window mode or the Upper Level 20 mV to 9 99 V threshold in the Normal mode This control is disabled in the Integral mode
14. 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 O 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 WARRANTY SAFETY INSTRUCTIONS AND SYMBOLS SAFETY WARNINGS AND CLEANING INSTRUCTIONS 1i DESCRIPTION voce gn tn a E ae Tete GENERAL sacs a e at te trett tetanos 12 MODES OF OPERATION lt td ETA dalla D T RA TA DAP S AAA EA A AA AAA 1 3 LEADING EDGE TIMING grii ier E a a 1 4 LOWER LEVEL REFERENCE 2 52542 hote data bebe bebe bebe bua ba da bua Da bla daa aa 2 SPEGIFIGATIONS LE ate torti lll tt ii 2 PERFORMANCE o o e O o o A A AE eM eel kane 252 CONTROLSE wa e nye aye ye Ses Bele lo lo lo lo o e pa Reeth Rar 2 35 INPUTS en
15. ment 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 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
16. ower supply it is used in conjunction with an ORTEC 4001A 4002D NIM Bin and Power Supply which is intended for rack mounting Note that the power supply must provide 6 V as well as 12 V and 124 V If vacuum tube equipment or any other source of heat is operated in the same rack there must be sufficient cooling air circulating to prevent any localized heating of the transistorized circuitry used throughout the 850 The temperature of equipment mounted in racks can easily exceed the recommended maximum unless precautions are taken the 850 should not be subjected to temperatures in excess of 120 F 50 C 3 1 CONNECTION TO POWER Turn off the bin power supply when inserting or removing modules Power supply voltages should be checked after the modules have been inserted Use the test points on the power supply control panel of the ORTEC 4001A 402D Bin and Power Supply to monitor dc voltages When operating the 850 outside the 4001A 402D Bin and Power Supply be sure that the power extension cable that is used properly accounts for the power supply grounding circuits that are provided according to the recommended AEC standards outlined in TID 20893 Rev Both high quality and power return ground connections are provided to ensure proper reference voltage feedback into the power supply and these must be preserved in remote cable installations Take care to avoid ground loops when the module is operated outside the bin 3 2 CON
17. 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 Instructions To clean the instrument exterior Unplug the instrument from the ac power supply e 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 ER ORTEC e 850 a QUAD SCA eLL ui 1 ORTEC MODEL 850 QUAD SINGLE CHANNEL ANALYZER 1 DESCRIPTION 1 1 GENERAL The ORTEC 850 Qua
18. those channels with W2 set in the Ext position will have the LL reference derived from the LL Ext Ref signal All channels with W2 set in the Int position will have the Lower Level reference derived from the front panel control The front panel voltmeter will read the Lower Level value when jumper W2 is set in either the Int or the Ext position 4 OPERATING INSTRUCTIONS Prior to operation each channel of the 850 should be set in the desired configuration Four PWB jumpers are available in each channel to select Integral Normal or Window mode Internal or External Lower Level reference and dc or ac coupled input Once the 850 is properly configured it can be connected into a system according to the installation information in Section 3 Figure 4 1 illustrates the timing relationships that will be effective in the 850 for each of two possible input pulse conditions One is a pulse that exceeds the Lower Level threshold without also exceeding the Upper Level and the other is a pulse that exceeds both thresholds If the 850 is configured in the Integral mode there is an SCA output pulse for each of the input pulses generated when the trailing edge of the input pulse crosses through the LLD level If the 850 is configured in either the Normal or Window mode and operates in a differential single channel analyzer mode an SCA output pulse is generated for the first pulse but not for the second For either mode the LL Out and UL Out
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