6. Pulse Processing Unit
Contents
1. 3 TXO 3 TX kable 1 2 RXO 5 ground 45 5 ground one 5 ground 7 RX1 Jable 2f 3 TX0 8 TX1 ES 1 2 RX0 When the unit B is disconnected pins 2 and 3 of the connector located at the end of cable 2 must be grounded with a 1000 Q resistor When a unit is in local mode it does not stop communication with other units in remote or forced remote mode For example if unit Ais in local mode and unit B is in remote mode the PC can send commands to unit B and receive data from unit B Fast Scintillation Detector and Pulse Processing Unit USER MANUAL V 4 Date 12 Nov 2002 Page 20 of 202. 8 6 PULSEPROCESSING UNIT eeoeecseves cest vasi eeehein ea esos Esoto sese eoe nv sucsdesssovevessscesssevessueess RETE Ese se UN e sel Rena 9 6 1 DIMENSIONS P ease tette EROR IENRRUOR E LAS I MS DRE gee lee abet oh cea acl CODD C PC MS D MS 9 62 SHAPING A MPLIFIBRE 25 nre hector DA rrt tidal stade dt Per e AA Ie RAI cM rcs qd 9 63 SINGLE CHANNEL A NALYSER sssssssssssssessssessssecssuecssuscsssecssssesssecssseessssessssessseesssicsssuessseesssutsssusessssesessneeess 10 64 HIGH VOLTAGE SUPPLY 6 5 PHOTOTUBE PREAMPLIFIER POWER ssssssssssssssssssssssssecssscssssesssvesssvecssuessusessueessusessuessusessutessaecssseesssee 11 66 CURRENT CONSUMPTION OF NIM VERSION ettet ttt ttt sessuessssseessussessssecs 11 67 MISCELEANEOUS 5 3 Siete vaca e do t tel e tl t e eae es 11 6 8 OPTIONS C EE 11 7 FRONT PANEL DESCRIPT ION sescesseesscescecsesesescsescsescecscesscesscesccesesesesosescsesccescesscescoesccesesesesesscseceesese 12 TA HAGA VOLTAGE IMMO M 12 72 PREAMPLIFIER AND SHAPING AMPLIPIER sscssssssssssssscssssecsssssecssssscssuscessusesssuecsssse tette ttt ttt ttti 12 73 SINGLE CHANNEL A NALYSER SCA esses nete tn tnter tette tenni tennis ne tette netten 13 8 COMMUNICATION BOARD 8 1 82 9 REMOTE CONTROL SOFTWARE FOR PULSE PROCES SING ELECTRONIC 16 9 1 INIRODUCTION 5 5 SAA EE et mE A troie b Sede tete estes 16 92 DESC
3. Every time this special character is acknowledged the program sends a single character ASCII code 6 to the host 9 4 Syntax rules Upper and lower case characters are accepted At least one space character is mandatory before a decimal data or before ON and OFF 9 5 Connecting with a Host Computer This unit can be connected to a RS232 port of a host computer Only three wires are needed The RS232 connector is located on the rear panel of the unit Ground signal is pin 5 recave signal pin 2 and transmit signal pin 3 The receive signal of the OXFORD DANFYSIK unit must be connected to the receive signal of the host computer If the host computer is a PC pins 4 6 and 8 must be tied together on the cable connector PC side Fast Scintillation Detector and Pulse Processing Unit USER MANUAL V 4 Date 12 Nov 2002 Page 19 of 20 The following protocol is supported by the OXFORD DANFYSIK unit baud rate 9600 data format 8 bits ASCII data and 1 stop bit parity none CTS RTS signals are disabled 9 6 Network Configuration These units are designed to operate in a network Up to 16 units can be linked together using only one RS232 port of the host computer When a unit is linked to the network its address must not be already in use by any of the other units The wiring for a network including two units connected to a PC is detailed hereafter PC Unit A Unit B connector connector connector 2 RX ada
4. Unit v 4 USER MANUAL Date 12 Nov 2002 Page 7 of 20 5 Scintillator A large range of scintillators is available from OXFORD DANFYSIK 5 1 Procedure for Changing a Scintillator Disconnect the detector from its cables Remove the two M 2 5 screws Labelled back screws on the detector drawing The connector plate is pushed externally by a spring situated inside the detector Disengage the connector back plate from the detector body Do not twist and break the connector cables these are Teflon and welding points are fragile Holding the scintillator housing steady in one hand unscrew the detector body During this operation the disengaged connector back plate must not rotate When unscrewed slide the scintillator along the front face of the phototube to a position where it touches the scintillator housing internal thread The phototube is coupled to the scintillator window by optical grease This coupling must be broken for this operation grasp the detector body in one hand and the scintillator housing in the other and apply a constant gentle force after some seconds the optical coupling will disconnect Clean the phototube and the scintillator windows with alcohol Store the scintillator in a safe dry and dark place Thread the new scintillator on to the detector body On the centre of the phototube window apply cn of optical grease do not spread this We recommend the thixotropic product from Dow Cor
5. gaussian 2 peaking time 0 5 us gaussian 3 peaking time 1 us gaussian 4 peaking time 3 us gaussian e dead time smooth and predictable counting loss leading to an easy correction dead time correction up to 800 000 cps peaking time 300 ns e base line restorer innovative base line restorer virtually no base line shift at high counting rate active even on undershoot of high energy saturating pulse Fast Scintillation Detector and Pulse Processing Unit USER MANUAL Date 12 Nov 2002 V 4 Page 9 of 20 e BNC pulse output unipolar pulses output available on the front panel Can be connected to a multi channel analyser e output level maximum output voltage clamped to 10 volts 1 ns override recovery time 6 3 Single Channel Analyser 1 front panel ten turns potentiometer lower level adjustable between 50 mV and 10 V e precision of the reading 10 mV linearity error 10 mV e thermal drift 0 1 mv C over the range of 10 to 50 C upper level adjustable between 50 mV and 10 V e precision of the reading 10 mV linearity error 10 mV e thermal drift 0 1 mv C over the range of 10 to 50 C 2 operating mode front panel four position switch e normal upper and lower level are separately adjustable between 0 and 10 V e integral upper level disabled e asymmetric upper level button adjusts the window between 0 and 1 V above the lower level symmetrical upper level button symmetrically adjusts the
6. to increase the gain in order to get a signal Every unit has an address given by DIP switches 1 through 4 SW1 on the communication board where switch 1 corresponds to address bit 0 and switch 4 corresponds to bit 3 A switch setting of OFF determines a bit value of 1 and a setting of ON determines a value of 0 Factory address setting is 0 Always switch the unit off before changing its address A unit address 7 corresponds to switches 1 OFF 2 OFF 3 OFF 4 ON Fast Scintillation Detector and Pulse Processing Unit USER MANUAL V 4 Date 12 Nov 2002 Page 17 of 20 9 3 Commands List Syntax Meaning RSTad reset the unit SYSTad COMM REM ON switch forced remote control on SYSTad COMM REM OFF switch forced remote control off INPad GAIN x set gain to x value SENSad SCA UPP x set single channel analyser SCA upper level to x value SENSad SCA LOW x set single channel analyser SCA lower level to x value SENSad PKT x set peaking time to x value SOURad VOLT x set high voltage to x value if the power supply option is installed SYSTad SEC ON enable security status SYSTad SEC OFF disable security status TRIGad ECO x set the delay for taking into account the beam saturation ad unit address an integer value from 0 to 15 It may be left out of the command when unit is set to address 0 For example RST and RSTO are both valid commands Values range for x parameter high voltage from 250 V to 1250
7. to remote control the X1000 unit are described in the next paragraph To setup a communication with a PC Windows operated a DEMO software and a CONTROL software are supplied in the attached floppy discs 8 1 General Construction The communication board is made around a C programmable miniature controller Little Star from Z World Engineering If user needs to make a special operating algorithm this can be programmed with the integrated C development environment which can be delivered through OXFORD DANFYSIK 8 2 Hardware Wiring Four digital to analog converters and a set of gates are connected to the miniature controller to drive the various parameters of the pulse processing unit Fast Scintillation Detector and Pulse Processing Unit USER MANUAL V 4 Date 12 Nov 2002 Page 15 of 20 9 Remote Control Software for Pulse Processing Electronic 9 1 Introduction The pulse processing units can be remotely controlled by a host computer PC or workstation through a serial link RS232 A network of up to 16 units can be built requiring only one serial port on the host computer The communication protocol is a subset of the SCPI Standard Commands for Programmable Instruments language A communication software example is given in the DEMO software showing various possible command lines This can help users to develop their own remote control interface software The purpose of the CONTROL software is to enable u
8. RIPTION 1 45 ito eth ERROR UR OE SO ER UTR PR n e e re e 16 Fast Scintillation Detector and Pulse Processing Unit v 4 USER MANUAL Date 12 Nov 2002 Page 2 of 20 93 COMMANDS TIS Torneo t aie i eta tabat en p dee ate ce ted ma s 94 DY NEARS RULES acriter Renee aed SHE E TS 9 5 CONNECTING WITH A HOST COMPUTER sssssssssssesesesesees ceseceseseseseaeseaeseseeeeesee tenerent tn entes 9 6 NETWORK CONFIGURATION cssssssssssscesssscececcecesececececcsssesssesesesesesesescucscecacecececeaseeeseseeseeeaes Fast Scintillation Detector and Pulse Processing Unit USER MANUAL Date 12 Nov 2002 V 4 Page 3 of 20 2 Warranty 1 OXFORD DANFYSIK warrants that the Equipment shall be free from defects by reason of faulty design workmanship or materials and that if within the guarantee period set out in sub clause 3 the Equipment proves defective for such reason OXFORD DANFYSIK shall adjust repair or replace it as it sees fit free of charge provided that T The Equipment has been used solely for the purpose for which OXFORD DANFYSIK understands it is to be used and in accordance with the operating instructions 1 2 The defect has not been caused by fire accident misuse neglect incorrect installation by the customer its customers agents or servants or unauthorised repair or maintenance or by use of sub standard consumables 1 3 The defect has not arisen from any design specification component or material supplied by the cus
9. This is the time elapsed between the arrival of an X or y photon inside the scintillator and the peak value of the signal out pulse A small value of the peaking time allows high counting rate but poor energy linearity A high value of the peaking time allows good energy linearity but the counting rate is limited by pile up of shaped pulses Peaking time of 0 5 1 and 3 us are obtained by three different order filters Coefficient of these filters were selected for minimum delay and ringing Fast Scintillation Detector and Pulse Processing Unit USER MANUAL V 4 Date 12 Nov 2002 Page 12 of 20 7 3 Single Channel Analyser SCA Upper level and lower level adjustment is available on the front panel Four modes of selection are provided n as normal int as integral a as asymmetric S as symmetrical These modes are absolutely identical to modes available on SCA s from other manufacturers NORMAL MODE Range of Variation Front Panel BNC Logic Output Lower level 0 02 to 10V out when leading edge of the shaped pulse crosses lower level voltage Upper level Oto 10V out when leading edge of the shaped pulse crosses upper level voltage Window out when falling edge of the shaped pulse crosses lower level only INTEGRAL MODE Range of Variation Front Panel BNC Logic Output Lower level 0 02 to 10V out when leading edge of the shaped pulse crosses lower level voltage Upper level disabled no output Window not applica
10. V gain from 096to 100 peaking time 300 ns 500 ns 1000 ns or 3000 ns SCA upper level from SCA lower level to 10 V SCA lower level from 0 V to SCA upper level delay from 20 2 s to 3000 300 s after this delay the security status is enabled and the saturation output signal goes high Examples INPO GAIN 12 5 SENSO SCA LOW 1 5 These commands set the gain at 12 596 and the SCA lower level at 1 5 V the address of the unit being 0 INP15 GAIN 12 5 SENS15 SCA LOW 1 Same command with a different address 15 Fast Scintillation Detector and Pulse Processing Unit v 4 USER MANUAL Date 12 Nov 2002 Page 18 of 20 All commands but RSTad consist of two distinct parts a header and a value They have an additional query form in which a question mark replaces the value do not insert a space character between header and question mark When a query form is received the program sends the current value associated with the command Query responses do not include the command header Examples INPO GAIN query from the host computer 12 5 value sent to the host computer SYSTO COMM REM query 1 means ON Forced remote mode on SYSTO SEC query 0 means OFF security status is disabled Warning The program waits for strings ending with a special character ASCII code 210 This character must be transmitted by the host computer When the program sends a current value it also sends this character after the value
11. age for the OXFORD DANFYSIK pulse processing units the customer will receive from OXFORD DANFYSIK a licence to use the accompanying software subject to the following terms and conditions e The software package may be used without time limit on one personal computer or workstation e Aseparate licence agreement and fee is required for each additional personal computer or workstation on which the package is used e The software package may not be duplicated or copied except for archive purposes or to replace defective media and each copy made must bear the copyright notices carried on the original The software package may not be transferred in any event to a third party unless written consent is obtained from OXFORD DANFYSIK e This software package is protected under copyright law and OXFORD DANFYSIK reserves the right to terminate this licence upon any violation of these laws In the event of termination the customer will be required to return all copies of the software package to OXFORD DANFYSIK e Some parts of the software package are specially protected in order to be read or modified only by OXFORD DANFYSIK engineers Under no circumstances will OXFORD DANFYSIK be under obligation to disclose information relating to these parts of the software 3 2 Limited Warranty The standard software is fully tested and under normal use is guaranteed to be free of bugs and defects on pulse processing units This insurance is not valid for
12. ble ASYMMETRIC MODE Identical to the previous normal mode but in this case the upper level 10 turns potentiometer defines a window adjustable between 0 and 1 V The bottom value of this window is bounded to the lower level Changing the low level from 0 to 10 V allows the window to scan the entire shaped pulse amplitude On the other hand front panel BNC logic output are described exactly as in the normal mode Fast Scintillation Detector and Pulse Processing Unit v 4 USER MANUAL Date 12 Nov 2002 Page 13 of 20 SYMMETRICAL MODE This is as for the asymmetric mode but here adjusting the upper level potentiometer increases the window symmetrically up to 0 5 V above and 0 5 V below the low level value FRONT PANEL BNC LOGIC OUTPUT The TTL or negative current fast NIM logic is jumper selected The logical one duration can be 100 ns or 500 ns selected For location of these jumpers refer to the RX board drawing Duration or logic can be independently set on each output Fast Scintillation Detector and Pulse Processing Unit v 4 USER MANUAL Date 12 Nov 2002 Page 14 of 20 8 Communication Board Enables RS232 communication allowing cascading of up to 16 units For each unit the following parameters can be independently controlled Phototube high voltage Preamplifier gain Single channel analyser lower and upper levels Shaping constant Saturation time duration allowed The software and instructions
13. board e PNP open collector pull down resistor e 10 mA available when ON e Available on a rear panel BNC connector 6 8 Options detector to pulse processing unit connection cable total lengths of 5 10 15 and 20 m available RS232 communication cable total lengths of 5 10 15 and 20 m available Fast Scintillation Detector and Pulse Processing Unit USER MANUAL Date 12 Nov 2002 Page 11 of V 4 20 7 Front Panel Description 7 1 High Voltage e Four digit display indicates the value of the set voltage e Voltage can vary between 250 and 1250 V other ranges on request e When high voltage is increased gain of the phototube increases but natural noise increases also e When a low noise is required at low energy the best trade off must be found between gain of the preamplifier and magnitude of the high voltage e Normal condition for the photomultiplier is between 800 and 1000 V 7 2 Preamplifier and Shaping Amplifier The preamplifier gain ten turns potentiometer adjusts the amplitude of the shaped pulses available on the signal out of the BNC socket These pulses are clipped at 10 V adjustable by the trim potentiometer R106 see RX board drawing This signal can be directly sent to a multichannel analyser it is a positive signal without negative undershoot The four position rotating switch adjusts the shaping constant Instead of this not directly measurable parameter the peaking time is indicated
14. e DANFYSIK Cyberstar 00 Fast Scintillation Detector and Pulse Processing Unit Operating amp Service Manual OXFORD DANFYSIK Unit 1 Ferry Mills Osney Mead Oxford OX2 OES UK Tel 444 0 1865 320 300 Fax 44 0 1865 320 301 http www oxford danfysik com customersupport goxford danf ysik com Fast Scintillation Detector and Pulse Processing Unit v 3 USER MANUAL Date 22th April 2002 Page 1 of 20 1 Table of Contents 1 TABLE OF CONTENTS ccscssssssssssssssssssessssessssessssessssessssessssessesessesessesassesessesassesassesansessesessessssesessessesoes 2 3 OXFORD DANFYSIK SOFTWARE LICENCE AGREEMENT AND LIMITED WARRANTY 5 3 1 LICENCE AGREEMENT sieve actos tS RR ERR CR RD E acta NEM e bes Se 5 32 LIMITED WARRANTY ua ectedie e Oen Rt nete edet bte NY 5 4 FAST SCINTILLATION DETECTOR eere eere eee oe ee tno eo senes eene etes en en sensn een en eso en eE een en etae a seta 6 41 SCINTILEATOR 6 senso eee rede bebe alii EE Ris 6 42 PHOTOMUETIPEIER RERO ERR ERRARE OR 6 43 HOUSING Verre a Rr uer Ies dye a M er reU Rr dr Md 7 44 CONNECTORS cric t b e t t tete Rote Re 7 45 VOLTAGE DIVIDER tette nee let to eer el rl en tel 7 46 PREAMPPIEIER n roe ceases D E UM UM exes e NES UD E EE 7 47 POWER REQUIREMENT aceras erisia A ENE REA EAEE 7 4 8 CABLES ce EE 7 CELO HU TREES TOR or DEN 8 51 PROCEDURE FOR CHANGING A SCINTILLATOR eerte tentent tette ttt tete ttttietnd
15. llium 0 2 mm thickness optional aluminium e background below 0 2 cps at 5 KeV Nal TI 4 2 Photomultiplier e diameter 38 mm scintillator 32 mm e photocathode bialkali adapted to the Nal TI scintillation wavelength e structure 10 dynodes e gain 105 typical e anode signal rise time 2 8 ns Fast Scintillation Detector and Pulse Processing Unit v 4 USER MANUAL Date 12 Nov 2002 Page 6 of 20 4 3 Housing e precisely machined from aluminium alloy Can be opened for easy access to every component e external dimensions e O rings for light tightness e u metal shielding 4 4 Connectors e high voltage e signal and low voltage e other connectors on customer request 4 5 Voltage Divider e principle e impedance 4 6 Preamplifier 48 mm L 138 mm 10 typical Lemo ERA size zero Amph nol 17DMW passive dynode chain 1 8 MQ e for low noise and improved speed this is directly attached to the dynode chain e output impedance gain bandwidth product Slew rate e driving capability 4 7 Power Requirement e high voltage supply e high voltage current e preamplifier supply current required 4 8 Cables e High voltage signal preamplifier supply e Option 50 Q 180 MHz 2000 V us short circuit protected 1250 V maximum 0 7 mA NIM standard 12 V 15 mA on the 12 V 15 mA on the 12V standard 5 metre length non standard cable length Fast Scintillation Detector and Pulse Processing
16. mote mode is selected by the host computer and has priority over other control modes It can be cancelled only from the host computer or by switching the unit off and on When turning on the power the unit is reset and the built in beeper is sounded as it is also at every reset command sent by the host computer As a safety feature the delay for taking into account the beam saturation is set to 2 s The beam saturation signal is monitored at a rate of 100 ms When the saturation duration exceeds the preset delay a digital signal goes high this signal can be used for actuating a beam shutter the high voltage is set down to 250 V the forced remote mode is selected and the security status is enabled This status can be disabled only by either switching the unit off and on or by sending a command from the host In local mode the program stored in the miniature controller continuously polls the status of the local remote button and checks if a forced remote command or query was received Other commands are acknowledged The first time the remote mode switching the local remote button or forced remote mode receiving a command from the host is entered high voltage is reduced to 250 V the power supply option is installed peaking time to 300 ns single channel analyser upper channel to 10 V single channel analyser lower channel to 0 5 V and gain to 096 In these modes commands coming from the host computer are processed Do not forget
17. ning Q2 3067 Never use a non thixotropic grease Re insert the phototube assembly inside the detector body and tighten the M 2 5 back screws on the connector plate being careful not to wear the threads The internal spring will gently squeeze the silicon optical couplant After five ten hours the detector will be ready to use Fast Scintillation Detector and Pulse Processing Unit USER MANUAL V 4 Date 12 Nov 2002 Page 8 of 20 6 Pulse Processing Unit LETHAL VOLTAGE PRESENT INSIDE DEVICE WHEN OPERATED 1250 VOLTS MAXIMUM High Voltage supply USER MUST DISCONNECT DEVICE BEFORE OPENING HOUSING FOR ANY REASON Please note that permanent damage to the phototube can occur if rated High Voltage supply value above is exceeded Disturbing ground loops warning In order to avoid unwanted effects the body of the phototube should always be electrically isolated from the experiment where it is installed Shielding ground warning In order to obtain the best signal shielding the body of the phototube must always be electrically connected to the ground of the pulse processing electronics used 6 1 Dimensions external double NIM unit 6 86 cm x 22 13 cm or 19 inches 3U Europe standard rack 6 2 Shaping Amplifier advantages fast speed dc coupling e gain front panel adjustable 10 turns potentiometer e shaping constant rotating front panel four position switch position 1 peaking time 300 ns semi
18. sers to immediately setup a complete run time interface link between a Personnal Computer Windows operated and one or more X1000 units Both softwares can be installed on the same computer just run Setup exe from the floppy disc Warning Before using these softwares you should make copies of your original floppy discs You should never use the original floppy discs for everyday operations Store them in a safe place 9 2 Description The pulse processing unit holds a C programmable miniature controller The program is factory stored in its EPROM According to the selected control mode this program is able to drive the unit by controlling the gain the peaking time and the single channel analyser upper and lower levels The high voltage power supply can be controlled when it is installed as an option in the unit Saturation threshold detection is also provided Three communication modes are possible local manual control remote and forced remote host control In local mode the unit is front panel operated In remote and forced remote mode the unit is driven by commands coming from a host computer Front panel switches and potentiometers are disabled and the red LED is lit by the miniature controller Local and remote modes are obtained by positions of the local remote button on the front panel Fast Scintillation Detector and Pulse Processing Unit USER MANUAL V 4 Date 12 Nov 2002 Page 16 of 20 The forced re
19. special software adaptations on non standard pulse processing units In this case OXFORD DANFYSIK agrees to correct at its own expense during a one year warranty period any defect arising during the use of the modified software package In no event will OXFORD DANFYSIK be liable for any direct or indirect incidental or consequential damages arising from a software failure Fast Scintillation Detector and Pulse Processing Unit v 4 USER MANUAL Date 12 Nov 2002 Page 5 of 20 4 Fast Scintillation Detector LETHAL VOLTAGE PRESENT INSIDE DEVICE WHEN OPERATED 1250 VOLTS MAXIMUM High Voltage supply USER MUST DISCONNECT DEVICE BEFORE OPENING HOUSING FOR ANY REASON Please note that permanent damage to the phototube can occur if rated High Voltage supply value above is exceeded Disturbing ground loops warning In order to avoid unwanted effects the body of the phototube should always be electrically isolated from the experiment where it is installed Shielding ground warning In order to obtain the best signal shielding the body of the phototube must always be electrically connected to the ground of the pulse processing electronics used 4 1 Scintillator e type Thallium activated Nal Easily interchangable thickness on customer request minimum 1 mm Other scintillators available BGO BaF Csl CsI TI CSF YAP e detector aperture standard 32 mm e energy up to 50 KeV Nal TI 10 MeV BGO e window Bery
20. tomer 1 4 No part of the Equipment has been replaced with a part not supplied by OXFORD DANFYSIK or approved as suitable by it 1 5 Payment in full of all sums due in respect of the Equipment has been made 1 6 The customer shall be liable for any costs incurred by OXFORD DANFYSIK in responding to claims made in respect of erroneous results caused by operator error or incorrect application 1 7 Upon the customer making a claim under sub clause 1 it shall accord sufficient access to the Equipment to enable OXFORD DANFYSIK staff to inspect and adjust repair remove or replace the Equipment 1 8 OXFORD DANFYSIK will co operate with the customer in the assessment of reported defects but the final decision regarding the applicability of this guarantee shall rest with OXFORD DANFYSIK 2 OXFORD DANFYSIK shall decide if the Equipment should be repaired pursuant to sub clause 1 at its site or returned 3 The applicable guarantee period shall be 12 months after delivery save where the Equipment is installed and or commissioned by or under the supervision of OXFORD DANFYSIK in which case it shall be 12 months from the date of the installation certificate or 18 months after the date of delivery whichever is the earlier Fast Scintillation Detector and Pulse Processing Unit v 4 USER MANUAL Date 12 Nov 2002 Page 4 of 20 3 Oxford Danfysik Software Licence Agreement and Limited Warranty 3 1 Licence Agreement As part of the sales pack
21. window 0 5 V above and 0 5 V below the lower level 3 BNC output signal e protection every output is short circuit protected e standard signal TTL output positive going 10 ns rise time zero 800 mV logical 1 2 volts minimum into a 50 Q load e duration internal jumper selected 100 ns or 500 ns e front panel upper level lower level and window output e miscellaneous no output on upper level or window if the upper level is below the lower level current NIM pulses available on any BNC output through a jumper selection logical 1 between 36 mA and 12 mA Fast Scintillation Detector and Pulse Processing Unit v 4 USER MANUAL Date 12 Nov 2002 Page 10 of 20 6 4 High Voltage Supply e Display 3 Y digit bright LCD 14 mm high numbers e output voltage adjustable by a front panel 10 turns potentiometer between 250 V and 1250 V e output current 1 2 mA e ripple 5 mV e thermal drift 50 ppm of the full scale per degree celcius e protection short circuit protected e output on the rear panel one SHV high voltage socket e current consumption 250 mA maximum on the 24 V line 6 5 Phototube Preamplifier Power rear panel NIM standard 9 pins sub D female connector 6 6 Current Consumption of NIM version e 300 mA maximum on the 24 V line e 120 mA on the 24 V line e 330mA on the 12 V line e 90mAon the 12 V line 6 7 Miscellaneous saturation ouput signal for actuating a beam shutter generated by RS232 communication
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