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1250 InSpector User`s Manual

1. The Inspector s Rear Panel Hardware Operation The Power System The Power System Power is always provided by one of the two batteries thus allowing a discharged battery to be replaced while the InSpector is acquiring data Furthermore since the InSpector uses commercially available camcorder batteries extra ones are readily available More information about how the InSpector manages its power consumption can be found in Power Management on page 40 The AC Power Adapter If the Power Adapter is connected to battery port A with the adapter s connecting cable and the InSpector s Power Manager is set to AC Full page 19 the adapter will supply power to the InSpector conserving the batteries for times when ac power is not available Low Battery Sensor If both batteries become fully discharged the InSpector s low battery sensor will auto matically turn the unit off disconnecting the batteries to prevent damage due to deep dis charge Charging a Battery To charge a battery remove it from the InSpector attach it to the charger and plug the charger into a line power outlet The charger s orange Charge lamp will stay on while the battery is being charged When the lamp goes out the battery is fully charged Refer to the charger s user s manual for complete instructions To avoid reducing the battery s capacity and to maintain battery performance the manu facturer recommends that a NiMH b
2. 37 Window function of 17 Grounding the SysteM 8 H High voltage Automatic turn on i osease yaari eee eese 16 Cable E 8 ASA rhe ni Ret 11 P tpose of sess io id ee eret 15 RANG sip Sos ooh aed hs SRG pru s Ed pubes 15 40 Resetting the 0 666 eccesso es 16 AP respetet o RP dI uS 39 NIE EM 16 Voltage control sis ce RR RR 40 Voltage limit osos sre 40 Voltage control ocacion res 16 Voltage limit ocios oir ae eecipaee ets 16 HV connector pinQUt 52 l Indicators ANCQUISIUOD couv ere a Ex ee S 11 Battery status conside 9 High voltage socer es 11 Inhibit cable connecting 8 Inhibit polarity Control asis cord a 39 Function of io co cc eere ees 15 Input Command cerro reb res 42 Name changing lesse esses 42 Out of Service s coc eee 43 Saving a definiti0N oooo ooooooo 43 rp MP 43 Input definition Printing pio iad peewee be HEN 47 Input definition Loading multiple o ooo cocooooo o o 49 IA RC ORE ER Rind 45 Report 2e prr RR EO eee 47 USING 3 6 RE RE UC ba REDE enar 47 Input polarity Control micos oro dr DEREN DERE 39 AAA eere eet 14 Input size setting the 43 InSpector ADC Settings suo is e dia nasa a ita 34 Amplifier settings o ooooooo ooo o 38 Amplifier setup 0 00 0 00005 32 Basic system components 2 Baud rate setting ov sss meet 32
3. r No of ADCs 91 L2 Ld COM Port Baud Rate COMI B 19200 NN Figure 17 The MCA Device Setup Dialog 31 MCA Input Definition Full Memory and Number of ADCs You can select the Number of ADCs and the MCA Full Memory size here Note that not all models of the InSpector allow these parameters to be changed Com Port and Baud Rate This dialog lets you select the host computer s communications port and set its data transmission baud rate The com port setting must be the same as the one you have con nected the InSpector to on your computer When a datasource is opened the InSpector s baud rate data bits stop bit and parity are automatically set to match the host computer s data transmission parameters Although the baud rate can be set as high as 115 200 your computer may not be able to sustain this rate without communication errors Many laptop computers are known to op erate at 57 6 kbaud If yours does not the default 19 200 baud rate allows reliable opera tion with most computers At lower baud rates the SAD TIMEOUT parameter in your CONFIG SYS file should be increased to prevent VDM Timeout errors To calculate the proper SAD TIMEOUT value multiply the spectrum size in channels by 484 and divide the result by the pro posed baud rate For example a 4K channel spectrum at 1200 baud would use a SAD TIMEOUT value of 4096 x 484 1200 1652 Amplifier Under the Amplifier command s
4. Full Plot mode which is meant for close interaction with an acquired spectrum will slow update rates to 10 seconds or more To find the fastest update rate Display Preferences by setting the update rate to 0 start an acquisition and note how much Real Time passes with each update Add 1 2 to 1 second to this to establish a your best update rate This allows some system capacity for processing mouse clicks marker and cursor interactions etc You should normally turn off the Marker Info status page during acquisition When this page is displayed the system has to calculate centroids area integral etc at each update This adds a processing burden that slows the update rate If you do need to use the Markers Info page to monitor an ROI for instance make sure the markers are set around the ROI If you leave the markers set to full spectrum there is more data to analyze which will make your screen update noticeably slower Asthe following table shows the update rate also depends on the size of the spectrum A 512 channel Nal spectrum updates much more quickly than an 8K Ge spectrum Tuning the Display Environment Spectrum Size 19 2 kbaud 57 kbaud 1024 channels 2 0 2 4 sec 1 2 1 4 sec 4096 channels 2 4 2 6sec 1 9 2 1 sec 8192 channels 2 8 3 2 sec 2 4 2 6 sec Though the InSpector is capable of serial communications at up to 115 kbaud most notebook comput
5. Unpacking the InSpector When you receive your InSpector hardware examine it carefully for evidence of damage caused in transit If damage is found notify Canberra and the carrier immediately Use the following checklists to verify that you have received all system components Basic System Your package should contain the following items The InSpector acquisition electronics unit This manual One computer communications cable One composite preamplifier cable Two NiMH batteries Duracell DR11 or equivalent Note The InSpector s nickel metal hydride NiMH batteries are shipped uncharged you must charge them before using them Refer to Charging the Batteries below One ac adapter One battery charger discharger A carrying case Unpacking the InSpector System Options If you ordered optional InSpector items your package will include any additional items you ordered Complete System A complete system consists of all of the items in the Basic System plus a notebook com puter All software will have been installed on the computer and the system will have been configured and tested at the factory Charging the Batteries Before the NiMH batteries shipped with the InSpector can be used they must be charged with the supplied battery charger Refer to the battery charger s manual for complete in structions on charging batteries Attaching the Batteries Referring to Figure 1 attach the fully charged batteries t
6. 8192 4096 2048 1024 512 256 LLD Range 0 1 to 110 of full scale programmable resolution of 1 part in 3152 ULD Range 0 to 11046 of full scale programmable resolution of 1 part in 3155 ZERO Range 0 5 of full scale programmable resolution of 1 part in 3414 INTEGRAL NONLINEARITY lt 0 025 of full scale over the top 99 5 of selected gain range DIFFERENTIAL NONLINEARITY lt 0 9 over the top 99 5 of selected gain range 59 Specifications DRIFT Gain lt 0 009 of full scale C Zero lt 0 0025 of full scale C Long Term lt 0 005 of full scale 24 hours at a constant temperature PEAK SHIFT lt 0 025 of full scale at rates up to 100 kHz CHANNEL PROFILE Typically flat over 9096 of channel width Digital Stabilizer STABILIZATION MODE Two point stabilization using spectrum reference peaks PEAK RANGE Channel 2 to 8191 PEAK WINDOW 1 to 64 channels WINDOW SPACING 2 to 256 channels windows symmetrically positioned on either side of peak CORRECTION RANGE Zero 1 of full scale Gain 10 or 1 of full scale programmable CORRECTION RESOLUTION 1 part in 4096 RATE DIVIDER 1 2 4 or 8 Pileup Rejector PULSE PAIR RESOLUTION lt 500 ns MINIMUM DETECTABLE SIGNAL Limited by detector preamplifier noise charac teristics Acquisition DATA MEMORY 8192 channels 32 bits per channel battery backed STORAGE MODE PHA ADD 60 Physical Physical AC
7. Battery B can be used to supply power to the instrument if ac is lost BATTERY BACKUP Internal lithium battery to back up MCA memory POWER MANAGEMENT An intelligent power management circuit optimizes battery life and avoids a deep discharge condition by automatic and manual power shedding techniques Individual power modes are Performance AC Power Programmable via computer refer to the earlier ac adapter description Full Power Signal processing electronics under full power Power Save Turns off power to the signal processing electronics Electronics are powered up for a user specified time before acquisition After acquisition is complete the electronics are turned off again Standby Lowest power mode during periods when there is no communication with the computer Host computer can restore to the Power Save or Full Power modes Off Controlled by the On Off switch only No power is consumed in the off position LOW BATTERY SENSOR When both batteries become fully discharged the unit will automatically switch to the Off state disconnecting the batteries to prevent damage due to deep discharge SYSTEM CONTROL The instrument can be manually directed into any power mode via the computer or can be set to automatically switch between Power Save and Full Power Modes corresponding to acquisition status PREAMP POWER Provides power and ground for standard preamplifiers 24 V at 40 mA 24 V at 30 mA 12 V at 80 mA
8. Com port seting x26 ik Re oases e 32 Complete system components 3 Connecting multiple o oo o o o 3 High Voltage settings o oooooooo o 39 Inputset ngs 2 rd 42 MCA setUngS Lese raid 34 MCA setup oos eme derer 31 Stabilizer settings sese see ee ees 35 TUMMINE ON uere e mx 9 Installation Battery os isset ds OR dd 3 Laptop sleep mode y 11 LEDs On the front panel ooooccoccoccocco o 9 Life of a battery charge 20 LED control ADC 15 34 LLD ULD functionof 15 Load A datab ase ces las 48 Multiple definitions 49 Low battery sensor 13 MCA Databases si cece dir 47 Defining in the MI s sues 30 Editing a definition lusus 45 Runtime configuration database 47 Saving a definition 00 43 Using an MID definition 25 MCA input definition MID Wizard veo rca ias 22 MCA Input definition editor See MID editor MCA settings o 34 MID editor Adding an MCA sessesses 26 MID wizard esee a 22 MID editor Basic concepts OL oooocococcooocoooco o 25 Creating a new definition 47 Defining an MCA sseusss 30 Definition summary 45 Delebng an MCA ossree x ERROR ges 29 Editing a definition 0 45 Entry dehining csse
9. Correction rng This control selects the Gain Correction range that can be provided to correct for drift 1 for a germanium detector or 10 for a sodium iodide detector Gain and Zero Rate Div The Rate Divisor controls adjust the count rate dividers at the input to the correction reg isters for each Mode For high count rate reference peaks increasing the Divider value will smooth out the correction applied to the system and minimize any peak broadening The Power Manager 18 The InSpector s intelligent power subsystem design incorporates a dedicated micropro cessor which optimizes the instrument s power consumption while continuously monitor ing the state of the batteries Power for the instrument is always derived from one battery which is indicated by a blinking Battery Indicator A battery with a voltage above 5 8 volts is considered charged and its indicator is green At 5 8 volts the battery s charge is low and its indicator changes to blinking red At 5 5 volts the battery is discharged and will no longer be used it must be replaced When in a steady red state the battery may be removed and replaced without disrupting operation of the other battery Continuous operation of the instrument will be assured if the reserve battery is fully charged indicated by a steady green indicator At switchover the now depleted battery s indicator will glow constant red or turn off Uninterrupted operation can be maintained indefinit
10. Zero Centroid This control sets the reference channel at the low end of the spectrum for zero intercept stabilization which prevents interference from the effects of gain drift 16 Programmable Electronics Spacing ii Window Window Centroid Figure 6 Relationship Between Stabilizer Functions Gain and Zero Window These two controls set the Gain and Zero stabilizer window width in channels that the stabilizer is to use as its sampling range for each Mode Gain and Zero Spacing These two controls set the spacing in channels between the upper and lower sampling windows for each Mode Gain and Zero Mode The Stabilizer s Gain or Zero or both can be set to Off On or Hold Onenables stabilization for the specified mode allowing the Stabilizer to compare the incoming data to the Mode s Centroid and Window settings then compensate for data below or above the Centroid Off disables stabilization for the specified mode and sets the correction adjustment to zero Hold disables stabilization for the specified mode and maintains the current correction adjustment at the Stabilizer s output If the drift in either mode zero or gain exceeds the Correction Range the overrange flag will be set and that mode will be changed to hold Set that mode to off to clear the 17 Hardware Operation overrange flag then correct the cause of the excessive drift before returning the mode to on
11. a few of them are explained in greater detail here Stabilizer The Zero and Gain correction values are the numbers representing the amount of correc tion made to the ADC The range of correction is O to 4095 with 2048 representing no correction If data drift causes either the Gain or the Zero correction to reach the limit of 0 or 4095 that stabilizer function will be changed to Hold and an overrange error flag will be set To clear the flag set that function to Off to clear the overrange flag and set the value to 2048 then correct the cause of the excessive drift before returning the mode to on Power Manager Battery A and B Status Bat A or B Status is reported as Good when the battery voltage is gt 5 8 V Low when the battery voltage is lt 5 8 V Discharged when the battery voltage is 5 5 V When the Power Manager detects a Discharged battery it will no longer use that battery port until the battery is removed voltage detected as 0 5 V and replaced with a battery with a voltage gt 5 5 V The Power Manager specifically looks for the battery to be removed because an unloaded battery will recover some of its voltage but will not have enough capacity to support a load for more than a few seconds Batteries The line labeled Batteries shows the status of the InSpector s batteries 51 Technical Information If this line reads Warning you have only a few minutes of power left before the In Sp
12. seaca u rovar E ek 14 RAM batt back status screen entry 52 Range Function of ui 15 High voltage control ooo oo o o ooo o 40 Rate divisors Function of iii esci ek epe ERES 18 Stabilizer controls oooooooooooo oo 37 Rear panel connector pinouts 52 Refreshing a battery 13 Reporting An input definition 00 47 Reset cable connecting 8 Reset pulse width setting 11 Resetting The HVPS InSpector 0 16 Runtime database Definition of coocionimi cr rg 47 Deleting an MCA from 29 Loading a definition to sues 48 Unloading a definition from 49 Runtime configuration database 47 Runtime database Adding an MCA to 0 0 00 00000 26 Save and save as difference 44 Selecting A Daud Tate eine a eee ete A ees 32 MME COM POM nete eR etes 32 Serial port power len dy 11 Setting High voltage ra res 39 The ADC re are Mira cta Es 34 The amplifier oou eR RR 38 The MCA Sinai steps toutes 34 The Stabilizer ssa ose 35 Setup DEVICE RR 30 Shaping Control amplifier oo oo oooooooo o 39 Function Of sco espe eer dre ed Rega 14 Spacing Gain Zero function O 17 Stabilizer Correction range ece csiri nner nicis 18 37 66 Gaincentroid ooooooo o 16 36 Mode controls
13. sls eese 93 63 Configuration database 47 Connecting the system cables 4 Connector pin Outs lt s e st sosse sesasi 52 Connectors rear panel 11 Conversion gain ADC priteka a 34 Function Of 2 00 ead eee ete 15 Correction range Function of 2i ce osse RR Rer 18 Stabilizer control esccaine esnie 37 Current database viewing the 47 D Database Loading a definition to llus 48 Runtime configuration 47 Unloading a definition from 49 Viewing the current esses 47 Defining An MCA 22521254 Re is 30 AAMI A rae Seuss eased nea aai i 26 Delay AGQqUISIUOD e vi Uh de rure 41 Standby iio eric oy 42 Deleting ADMCA ini rad eus 29 DEVICE setup i dk gk Re Bw Bae e 30 Discharging a battery 13 E Editing An MCA Definition eee carrea nege 45 An MID Definition ooo oococoooooo 45 Energy Cable connecting oo oooooocooooom o 7 Explanation of the status screen 51 F File descriptor use of Ln 44 Fine gain amplifier 38 G Gain Amplifier function of 0 14 Centroid control ces esas esses 36 Centroid function of 16 Mode Stabilizer soca vlr eds 37 Ratedivisor siiin ei iaia e a eee eee 18 37 64 Spacing stabilizer ooo o o ooooo 37 Spacing function Of siers udare derrate 17 Window stabiliZer
14. 00 20 aa 37 Mode function of ooooooo o 17 ccu RED 37 Purpose Of 2 22 ecce ai 16 Rate divisors o ooooooooooooo 18 37 Set ngs estos oe ds wee Gabe eere 35 Spacing controls 0005 37 Spacing function of 200 17 Status screen entry 005 51 Window controls ooooocoooooooo 37 Window function of o oooo 17 Zero CONO iiio RUE er ER 16 36 Standby Delay sese REC Oe ebd 42 Pu nction of a 19 State of the batteries 9 Status EVPS control ecesanta n oes 16 IndiCatots sas det ur ect didas 9 Status screen Entries explained ooo ooococoomoo o 51 Summary of MID definitions 45 Super fine gain amplifier 38 System Connections a cbe Re a 4 Grounding eiii te wes 8 Title bar asteriskin LL 43 Turning on the InSpector 9 ULD control ADC 15 ULD control ADC 35 Unloading a database definition 49 Using An input definition 00 47 An MCA definition 04 25 Virtual data manager See VDM Voltage control Function Of euro ad 16 High voltage oc or e mete rem 40 Voltage limit Function of csse bee ere 16 High voltage control 0 40 W Window Gain Zero function of 0 17 Z Zero ADC control 0 0 0 35 ADC f nc on of ore pP ERR 15 Centroid con
15. Cable The C1712 cable which is designed for the typical PMT tube base used with most Nal detectors includes the preamp Power Energy and HV connectors C1713 Cable The C1713 cable is designed for box style preamps and is included with U Pu InSpector systems instead of the C1711 It includes the Preamp Power Energy HV and HV Inhibit connectors C1714 Cable This cable which is designed for TRP and Optical Reset preamps in cludes the preamp Power Energy HV HV Inhibit and Reset connectors Connecting the Composite Cable One end of the Composite Cable has two connectors A large rectangular connector on a thick cable Connect this to the InSpector s PREAMP connector e A barrel shaped SHV connector on a thinner cable Connect this to the InSpector s HV connector The other end of the Composite Cable has several connectors Onerectangular connector Several barrel shaped connectors Power Connector Connect the cable s rectangular connector to the preamp s 9 pin power connector Energy Connector Connect the cable s Red energy connector to one of two instruments Anexternal preamp s energy output connector Its signal must be either a voltage tail pulse usually derived from an R C preamplifier or a step input usually derived from a TRP preamplifier Properly matching the amplifier parameters to this input shape is essential to achieving optimum system performance Refer to Setup and Configuration Prea
16. InSpector s ADC Inputs not inside this window are discarded Zero In most cases channel one of the spectrum is made to correspond to a zero energy input zero intercept This means that the location of a given pulse in the spectrum is linearly proportional to the height of the pulse s input signal In some cases however the Zero control can be used to offset the spectrum by up to 5 of the ADC s current conver sion gain The ADC s zero is factory set for each conversion gain so that a 0 setting of this control corresponds to the zero intercept at channel 3 The HVPS The High Voltage Power Supply s HVPS programmable controls are Range Voltage Limit and Voltage which set the bias voltage for the detector and Status and Reset Range The Range control sets HVPS s absolute voltage limit to positive 1300 volts which is used with a sodium iodide or cadmium telluride detector or positive or negative 5000 volts which is used with a detector requiring very little bias current such as a germa nium detector 15 Hardware Operation Voltage Limit For operating safety the Voltage Limit establishes the HVPS s maximum output voltage within the selected range Voltage The Voltage control sets the HVPS s actual output to a voltage between zero and the Voltage Limit Status If the Power Manager described on page 18 is in the Battery Full mode or the AC Full mode you can turn the HVPS On or Off In the Battery Save mode y
17. WRITTEN ORAL EXPRESSED IMPLIED INCLUDING WITHOUT LIMITATION THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE SHALL APPLY IN NO EVENT SHALL CANBERRA HAVE ANY LIABILITY FOR ANY SPECIAL INDIRECT OR CONSEQUENTIAL LOSSES OR DAMAGES OF ANY NATURE WHATSOEVER WHETHER AS A RESULT OF BREACH OF CONTRACT TORT LIABILITY INCLUDING NEGLIGENCE STRICT LIABILITY OR OTHERWISE EXCLUSIONS Our warranty does not cover damage to equipment which has been altered or modified without our written permission or damage which has been caused by abuse misuse accident or unusual physical or electrical stress as determined by our Service Personnel We are under no obligation to provide warranty service if adjustment or repair is required because of damage caused by other than ordinary use or if the equipment is serviced or repaired or if an attempt is made to service or repair the equipment by other than our personnel without our prior approval Our warranty does not cover detector damage due to neutrons or heavy charged particles Failure of beryllium carbon composite or polymer windows or of windowless detectors caused by physical or chemical damage from the environment is not covered by warranty We are not responsible for damage sustained in transit You should examine shipments upon receipt for evidence of damage caused in transit If damage is found notify us and the carrier immediately Keep all packages materials and
18. and 12 V at 30 mA maximum total power 2 4 W Performance HVPS MULTI RANGE Programmable 5 V to 1 3 kV 41 3 kV to 5 kV 10 V to 5 kV resolution to within 1 part in 4096 rear panel SHV connector LOAD CURRENT 1 3 KV range 500 WA 5 kV range 100 uA from 65 to 5000 V be low 65 V linearly derated at 1 3 WA per volt NON LINEARITY lt 0 3 of full scale RIPPLE AND NOISE AT RATED LOAD CURRENT 1 3 kV range lt 5 mV peak to peak 5 kV range S50 uV peak to peak 57 58 Specifications OUTPUT STABILITY Long term drift of output voltage is lt 0 01 h and lt 0 02 8 h at constant load and ambient temperature after a 30 minute warmup TEMPERATURE COEFFICIENT lt 50ppm C after a 30 minute warmup REGULATION lt 0 02 variation in output voltage over the load range at constant am bient temperature OVERLOAD PROTECTION Power supply will withstand any overload including a short circuit for an indefinite period CURRENT LIMIT 1 3 kV range 1 6 mA maximum 5 KV range 350 uA maximum SETTLING TIME 100 V s turn on or turn off Amplifier GAIN RANGE Programmable from X2 to X1500 based on a 10 V full scale output programmable resolution of 1 part in 16 000 SHAPING TIME Programmable fast 1 us or slow 4 Us POLE ZERO Automatic 40 us to range TRP oo DRIFT Gain lt 0 0075 C dc level lt 7 5 u V C INTEGRAL NONLINEARITY lt 0 05 over total ou
19. button pressing the keyboard s ENTER key after making changes in this dialog box will cancel the changes Be sure to click on the OK key to accept the changes Coarse Gain The Amplifier s Coarse gain setting is selected from the drop down list Fine Gain The Fine gain control which is set by a Scroll Bar provides a gain multiplier from 1 to 4 S fine Gain The S fine Gain control can be used to establish a specific gain energy per channel 38 Defining an MCA Shaping Mode This control sets the amplifier s shaping time constant to Slow approximately 4 us shaping or Fast approximately 1 us shaping For the Nal InSpector the shapings are 1 us Slow and 0 5 us Fast PUR This control turns the amplifier s Pileup Rejector PUR On or Off When PUR is on a Live Time correction is performed for pulses that are piled up Inp Polarity The Inp Polarity control matches the polarity of the amplifier s Input to the polarity of the preamplifier s Output This control can be set only in this Dialog Box it cannot be changed in the Aquisition and Analysis application Preamp Type Use the Preamp Type control not available on the Nal InSpector to specify whether your preamp is a TRP transistor reset preamplifier type or an RC resistor capacitor type preamplifier This control can be set only in this Dialog Box it cannot be changed in the Aquisition and Analysis application Inh Polarity If you are using a TR
20. e ecese waa a d a a ea ee 43 Save and Save ASe a ee see ae e A qs we A pa 44 Using Save AS eo bbe x Ev Ub XE mor E A 44 Changing the Summary View icew eo lees 44 Editing an MCA Definition o lt lt e RR hne 45 Opening an Input Definition File es 45 Viewing the File Detalla great y iaa a deb gun tees 46 Editing the Definition sos ceee eas apea to eona ore RE TT Y E ES 46 The New Command 2 soeces 6G as a hae ORE GEO E DRE NC eoe a 47 The Input Definition Report sss 47 Using MCA Definition Tables s 47 Viewing the Current Database cios soa wee m ER o woe AA eie 47 Loading and Unloading Definitions 00 0000 0002 eee 48 Loading the Database i ox a a Dok bob OE A 48 Unloading the Database p ise si ee 49 A Technical Information 51 Status Screen Entries ciar a a NR NU A Ore a R 5 StablliZet acortar TTE tata A E LITE 51 Power Manacer o me mip tor ma tte eed e o ee ue Elda de die NAS dude A amp a 51 Rear Panel Connectors x xg wR eom ee DAR OR 3C A Ree OX ONCE p Es 52 B Specifications x kGoR amp x xx A 9 o 944 DU Input OutpuL mar org ethos nh ox OP M SE ener ER wire Ee AER Be attests ade s 55 ContolsS 2s chutes ego e Rok m Ron Eom won X PROP EOW EO e y E BUR ewe E X RO Ron eb ws 56 Indicators REP TITIUS 56 PowerSubsystet s doble k edem Oe RO a Eoo A Wed Xon A 56 Perform nte sree 2 ce o ok Rok ROC A RGD E ROW OO 5
21. focus is on the Cancel button pressing the keyboard s ENTER key after making changes in this dialog box will cancel the changes Be sure to click on the OK key to accept the changes Conv Gain This control sets the Conversion Gain of the ADC over the range of 256 channels to 8192 channels Clicking either on the arrows at the ends of the Scroll Bar or in the area to ei ther side of the Scroll Bar s Slider will change the gain by a factor of two LLD The ADC s Lower Level Discriminator LLD can be set from 0 1 to 110 0 of the ADC s full scale input 34 Defining an MCA ULD The ADC s Upper Level Discriminator ULD can be set from 0 0 to 110 096 of the ADC s full scale input The window between the LLD and ULD settings is used as a filter to limit the energy range to be considered by the ADC Only signals within this window will be converted Zero The ADC s Zero is factory set for each conversion gain so that a Zero setting of 096 cor responds to zero intercept zero energy input stores in channel 3 the first channel used for spectral data storage for that conversion gain The Zero control with a range of 5 0 to 5 0 of full scale can be used to change the zero intercept to another channel Stabilizer The InSpector s Stabilizer maintains the stability of high resolution spectroscopy in ap plications involving long count times or high count rates It accomplishes this by using reference peaks in the spectr
22. in that file must have a unique name Using the MCA Definition Files To use an MCA Definition you must first have saved the definition to disk as a file Once you ve done that all you have to do is load that file into InSpector s internal MCA Runtime Configuration Database From that point on all MCA operations will use the configuration information that was stored in the Definition File To change to a new con figuration all you have to do is replace the database s contents with a new file Starting the MCA Input Definition MID Editor Start the MCA Input Definition Editor MID by double clicking on its icon in the Ge nie 2000 folder The result will be the application window shown in Figure 11 25 MCA Input Definition Note that the phrase local Untitled in the title bar means that the MID Editor is con nected to the local VDM and that no file is currently open this is the default condition in a non networked environment Summary Help Size ADC MXR Stab Amp HV Figure 11 The Mld Editor Window Building an MCA Definition Building an MCA Definition means Selecting the MCA and front end hardware to be used for each input through the Device Menu Defining the operating characteristics and modes for each MCA and its front end hardware through the Settings Menu In this section we ll explain how to add and delete the MID editor s MCA entries and will explain what the definition entry consi
23. part of the composite cable attaches to this connector It supplies the detector s operating bias from the InSpector to the detector Computer The computer cable which carries data between the InSpector and the host personal com puter attaches to this connector Note Since most laptop computers have power management features which shut off power to non essential circuits you ll have to make sure that the power to your laptop computer s serial port is on before trying to communicate with the InSpector Amp The Amp test point allows you to monitor the amplifier output while manually adjusting the amplifier s pole zero or to verify the performance of the automatic pole zero which is covered in detail in Pole Zero in Appendix D Technical Information of the G e nie 2000 Operations M anual It is also used when adjusting the width of a Transistor Re set Preamplifier s TRP s Inhibit Reset pulse which is described in Adjusting the TRP Reset Pulse in the same Appendix Preamp The preamplifier cable part of the composite cable attaches to this connector It provides power from the InSpector to the preamp and carries the output signal from the external preamp or amplifier the preamp s HV Inhibit signal and a reset preamp s Inhibit signal to the InSpector 11 12 f O de o2 g 2 alse O dl e Figure 5
24. s output Correction rng This control not available on the Nal InSpector selects the Gain Correction range that can be provided to correct for drift Select 1 for a germanium detector or 10 for a sodium iodide detector This control cannot be set in the Aquisition and Analysis applica tion Gain and Zero Rate Div The Rate Divisor controls which can be set to 1 2 4 or 8 adjust the count rate dividers at the input to the correction registers for each Mode For high count rate reference peaks increasing the Divider value will smooth out the correction applied to the system and minimize any peak broadening These controls cannot be set in the Aquisition and Analy sis application 37 MCA Input Definition Amplifier Selecting the Amplifier command will pop up the Dialog Box shown in Figure 23 Some of the controls shown in the figure may not be available on your InSpector Amplifier for input DETO1 Fine gain pS fine gain Shaping mode E 1 00 1 00001x Slow EN END Fast 9800 1 02 Preamp type pinh polarity Positive QTRP Positive Q Negative RC O Negative Figure 23 The Amplifier Settings Dialog Though most of these controls can also be adjusted in the Aquisition and Analysis appli cation the Input Polarity the Preamp Type and the Inhibit Polarity can only be changed in this Dialog Box Note This window s initial focus is on the Cancel
25. 11 25 same as C1711 10 but 7 6 m 25 ft C1712 25 same as C1712 10 but 7 6 m 25 ft Minimum Computer Requirements 62 486 processor 486 and coprocessor recommended 16 MB RAM memory more will improve performance 200 MB hard drive Windows 95 or Windows NT for Genie 2000 software Index A AC power using 13 Acquisition Delay control eeyo ie eee REL 41 Indicator serian noes E RS 11 Adapter power 13 ADC Conversion gain 2 2 eee eee eee 15 34 I Ic 15 34 PULPOSC OF ose tete 15 SA dean ed pee da eel 34 Ubica URP TUE Ss 15 35 lop m 15 35 Adding AnmMQCX vem LEES oo 26 Amplifier Coarse Pall eii ires ER RE ERR RS 38 lance 38 Grainy Functon Ok pner ESTE 14 Inhibit polarity lesse 15 39 Input polarity control ooo ooo oo o 39 Input polarity function of 14 Pole Zero zs nre LEE iS RE REUTERS 14 Preamp type s etebk E e REV ens 14 Preamp type control ooo oo o oo oo o o 39 PUR control usuaria aoe 39 PUR f nctuoimof 22 ense Lewes 14 Purpose OF escisi n 14 Seting the oae esce EEMRR popa 38 ShapinP 2 5504 PR he se ER t 14 Shaping control so 20 6 sedeeeede bases fas 39 Super fine gain ee eee 38 Applyngpower o 9 Asterisk In th title csi rie 43 Attaching the batteries 3 Automatic VPS tuin Mie satis Pan es 16 Basic system components 2 Batteries status scre
26. 200 h lt Back Cancel Help Figure 9 Step 2 Steps 3 5 You won t see the screens for Steps 3 4 and 5 these steps are not used when setting up an InSpector MCA Step 6 The Step 6 screen in Figure 8 asks for a detector type and acquisition memory size and requires that an Input Name be entered MID Setup Wizard Step 6 Input Name 1 7 r Number of Channels 8192 Detector Type is 256 Figure 8 Step 6 23 MCA Input Definition Step 7 The Step 7 screen in Figure 10 displays a summary of the current MCA s configuration for review and lets you enter the name of the MID file that the configuration is to be saved to The Input Name defaults to UNTITLED which you ll probably want to change to some thing more meaningful If the name you enter is the same as that of an existing MID file the system will ask if you want to overwrite the existing file MID Setup Wizard Step 7 Summary Mid FileName Ma E MCA Type InSpector i COM Port COM1 Baud Rate 1200 i Full Memory 8K INPUT Configuration E Detector Settings be Input Name DETOT i f Type Ge Number of Channels 8192 i i Number of Memory Groups 1 i Amplifier Settings Type INTERNAL i ADC Settings Type INTERNAL ie HVPS Settings Type INTERNAL lt Back Finish Cancel Help Figure 10 Step 7 Ending the Definition To complete your Input Definition select Finish The input that
27. 7 lb Tr TUTTI 57 AMPULE acid noe uo Reed Ea dE Eu EGORQE SB ERE adem oe 58 ADC oto e REL Ged wales O A TR om Re cune d etos ecd doe dee d 59 Digital Stabilizer s potea spo x BA OO es EE BO ego oe dde de 60 Pileup Rejector 4 4 ooo RR RR RR RR m a a Roy o oboe xoxo e M 60 ACQUISICI N os ew oa ee we A ee we wd 60 Physical 6 AAA ogee dh Sox ed de DASE Moe A Ala LOA AA AD ne 61 Ordering Information 2 605 24 Fee RR EEE rom moe go y e RR PUE Ee S ED 61 DD IPM TC TT 62 Minimum Computer Requirements les 62 IGEN uu oae Reo EC ee ee now b UN CX Xo x xov won Dd 1 Introduction This manual includes information on unpacking and setting up your InSpector Chapter 2 serves as a guide to unpacking and connecting your new InSpector Chapter 3 introduces the InSpector s programmable electronics and describes the use of each function Chapter 4 covers the MID Wizard and the MID Editor which help you quickly set up your system Appendix A discusses the status screen entries for the Stabilizer and the Power Manager and describes the rear panel connectors Appendix B is a full listing of the InSpector s specifications When you ve completed your setup you ll find complete operating instructions in the Genie 2000 manual set 2 Setup and Configuration This chapter serves as a guide to unpacking and connecting the system Software installa tion is covered in Appendix A of the Genie 2000 Operations M anual
28. A INTERFACE EJA RS 232 interface to host personal computer 9 pin connec tor auto sense selection of data transfer rates 115 2 57 6 38 4 19 2 9 6 1 2 kbaud 55 Controls Specifications ON OFF No power is consumed in the off position In the on position the batteries are load tested and continually monitored with status shown by the Battery Indicator LEDs Indicators BATTERY STATUS A B LEDs indicate which battery is in use when a battery is low and when a battery is discharged disconnected Switch over is automatic HV ON LED to indicate the presence of HV at the rear panel SHV connector ACQUISITION LED to indicate acquisition in process BATTERY CAPACITY LED array indicators standard on Sony Battery Pack Model NP 80D or equivalent Power Subsystem 56 BATTERY PACK Dual 6 V NiCd battery packs standard Sony Camcorder packs Model NP 80D or equivalent BATTERY LIFE Approximately three hours of live acquisition time for two batteries with an HPGe detector and 2002C preamp or with an Nal detector At a typical operating duty cycle of 50 approximately a full days operation can be expected POWER RESERVE Battery cartridges may be changed one at a time without inter rupting the instrument operation FAST CHARGER Separate charger for standalone batteries charge time approxi mately two and one half hours AC ADAPTER 110 220 V ac external supply connected to the unit in place of battery A
29. MP ADC IN Programmed to accept preamp signals or external amplifier outputs BNC connector INT AMP MODE Accepts positive or negative tail pulses amplitude 10 V divided by the selected gain 25 V maximum rise time less than shaping time constant decay time constant 40 us to polarity programmable R 9 KQ gt R gt 0 95 KQ R changes with Gain and Polarity setting EXT AMP MODE Accepts positive unipolar or bipolar positive lobe leading pulses for PHA amplitude 0 to 10 V 12 V maximum rise time 0 25 to 100 us maximum width 5 us minimum input impedance 1kQ direct coupled INHIBIT Accepts a standard logic signal from an associated reset preamplifier used to extend the Dead Time signal inhibit and reset the pileup rejector and provide a reject to the ADC during the preamplifiers reset cycle positive true or negative true signal polari ties programmable Loading 4 7 kQ Logic High 23 6 V Logic Low lt 1 V 0 to 12 V maximum BNC connector HV INHIBIT Logic Low or ground inhibits the HV outputs max logic low lt 0 7 V logic high 22 0 V or open circuit enables 0 to 12 V maximum BNC connector PREAMP POWER x12 V dc 24 V dc HVPS OUT Programmable dual range and polarity 5000 V dc with 100 uA output current capability or 1300 V dc with 500 uA output current capability programmable range resolution of 1 part in 4096 rear panel SHV connector isolated from chassis ground by 47 resistor DAT
30. Model 1250 InSpector Spectroscopy System 9230872D Hardware Manual ISO 9001 SYSTEM CERTIFIED Copyright 2003 Canberra Industries Inc All rights reserved The material in this document including all information pictures graphics and text is the property of Canberra Industries Inc and is protected by U S copyright laws and international copyright conven tions No material in this document may be reproduced published translated distributed or displayed by any means without written per mission from Canberra Industries Canberra Industries 800 Research Parkway Meriden CT 06450 Tel 203 238 2351 FAX 208 235 1347 http www canberra com The information in this document describes the product as accurately as possible but is subject to change without notice Printed in the United States of America Table of Contents 1 Introduction 2 Setup and Configuration Unpacking the InSpector e a a a a ee e Connecting the System r a sirom ba EE HDD RRR REE HE ROW RO o Re The Computer Cable e udo ls ee a ee a gros The Composite Cabl sien eee eee eR m RE RR Dee eee eS Grounding the System s lt 5 3 ue doves ROS dae Oe D RT d ae eh ee e 3 Hardware Operation POWE S WICH s a ero des a ee UE CERE UR ea eee Umen Ui amp eee el cet eie ORE IE ER Th Status Indicators 4 es ae ee RR emo ko VOX OS Oo ee ee Be a The Connector PM Cc p ITI The Power System x ondoroe komm Walk Aem xo 3 om Rope ER ok
31. P preamplifier the Inh Polarity control not available on the Nal InSpector matches the polarity of the amplifier s Inhibit reset input to the polarity of the preamp s Inhibit output This control can be set only in this Dialog Box it cannot be changed in the Aquisition and Analysis application Refer to Adjusting the TRP Reset Pulse in Appendix D Technical Information of the G enie 2000 Operations M anual for instructions on adjusting the TRP s Inhibit pulse width for proper operation High Voltage The High Voltage command shown in Figure 24 adjusts the High Voltage Power Sup ply HVPS Some of the controls shown in the figure may not be available on your In Spector Note This window s initial focus is on the Cancel button pressing the keyboard s ENTER key after making changes in this dialog box will cancel the changes Be sure to click on the OK button to accept the changes 39 MCA Input Definition High Voltage Supply for input DET01 Range 4 Voltage limit Voltage O 5000v 1399 9v ev ok 1300v q D I IE O 5000v 1300 0 1300 x amu Figure 24 The HVPS Settings Dialog Range The Range control not available on the Nal InSpector which must be set before the Voltage Limit or Voltage Control is adjusted sets HV Power Supply s absolute voltage limit to positive 1300 volts for a sodium iodide or cadmium telluride detector or positive or negati
32. QUISITION GROUP SIZE Always 8192 channels DISPLAY GROUP SIZE 8192 4096 2048 1024 512 or 256 PRESET MODE Live or Real Time computational presets are performed by the host computer TIME RESOLUTION 0 01 s PRESET TIME 1 to 10 s TIMER STORAGE Memory channels 1 live time and 2 real time SIZE 26 9 x 27 2 x 4 8 cm 10 6 x 10 7 x 1 9 in WEIGHT 3 2 kg 7 0 Ib with batteries OPERATING TEMPERATURE 0 45 C RELATIVE HUMIDITY 8 80 non condensing Ordering Information Model 1250 InSpector Portable Workstation components include InSpector acquisition electronics unit e Genie 2000 Basic Spectroscopy Software S504 PROcount 2000 Counting Procedure Software S503 Serial communications cable C1715 2 Composite quick disconnect detector cable 3 m 10 ft C1711 10 AC adapter charger Pair of Sony NP 80D 2 7 amp hr or equivalent battery packs Carrying Case 61 Options Specifications Consult factory for Genie 2000 and Windows 95 NT ordering information Model 1212 Cigarette Lighter Adapter Sony or equivalent 501 Genie 2000 Gamma Analysis Software 505 Genie 2000 Quality Assurance Software Special Composite Cables C1712 10 3 m 10 ft composite cable tailored for Nal detectors C1713 10 3 m 10 ft composite cable tailored for box style preamps C1714 10 3 m 10 ft composite cable tailored for Reset Style TRP or Optical Reset preamps C17
33. Rd Sobre Fox ee Lug Programmable Electronics lees DS D OMM rrr The HVES scare aro ina Rep Axe Re AO E edid UR A dcm E Whe stabilizers 5 dor prr cer ee POE evene oho je fied Te ters ee a ee The Power Managet se s gnie m ace wo X RO omo oy x Rom XR ER E Om Xv Xe de Tuning the Display Environment 4 MCA Input Definition Th MID Wizard 2 wee gio c a demens ae DA e peat cens The MCA Input Definition Editor lt o o ee sss es Basic Concepts ecs e p sdg ma oe o bomo E RR ERE REE HERE EE EE POSU E OR B E emos Starting the MCA Input Definition MID Editor lens Building an MCA Definition les Adding an MCA lt 24204 2 646 Rom ee ER EROR PR Y Ce woe Eo ERO a Interpreting the Definition Entry o ss s s sos e Deleting ati MCA 5 xx soe ROGER ex EU Bere we ee AI a er eoe E e 29 Defining an MCA e 222wxceuek Rp AA M Recap Pe EE wn 30 Device Setup ep uo boe e RR mon d ERR LEER SER SEEDED EUR RR S e eos 30 hit c ITI 31 Ampliners PC RRA cc 32 The SOME c DEC A ey da T 33 MEA D PI 34 ADC 44 woke ee d hos e EEE a e PUR SE e due e oS eA 34 Stabilizer amp coros oom oom domom 39 ROS de ad e SUE Pen 35 AMDT aaa us e y a a a GN X06 d AAA a 38 High Voltage 2c eoe ko wow onm oo on ok qon RR mov EOS x m POR RUE WO RAS 39 Power Management x ae on ove ROS X Wd DER eode a Be eh Eo eos 40 MPU se ego ae a M Rm tla ied de we aoe A Ga eed 42 Saving the Input Definition
34. attery be fully discharged once every five charges Refer to the charger s manual for complete instructions Programmable Electronics The InSpector s front end electronics are fully programmable eliminating physical switches knobs and jumpers Functions such as changing the detector bias and reversing the high voltage polarity are software controlled as well The initial setting of the pro grammable functions is made in the MID Editor when first defining an Input this proce dure is fully explained in The Settings on page 33 In addition most of these settings can be changed while acquiring data as explained under Adjust in the Gamma Acqui sition and Analysis chapter in the Genie 2000 O perations M anual or the 509 Alpha Ac quisition and Analysis M anual 13 14 Hardware Operation The InSpector s internal amplifier receives the output pulses of the external preamplifier shapes them and amplifies them so that they are more suitable for analysis The output of the amplifier is passed to the internal Analog to Digital Converter ADC The ampli fier s programmable controls are Coarse Gain Fine Gain Super fine Gain Shaping PUR Input Polarity Preamp Type automatic and manual Pole Zero Inhibit Polarity Gain The amplifier s gain the amount of amplification that the input signal is given before it is sent to the ADC is set by the coarse gain fine gain and super fine gain controls The fine gain and super fine gain contr
35. can be opened in the editor See Unloading the Data base on page 49 for the procedure to use Viewing the File Details If you re not sure which file you want to edit click on the name of the file that you think is the correct one then click on the Info button to see further information about the file Doing that will pop up the Dialog Box shown in Figure 30 File Info File Name SAMPLE File Descriptor Sample Input Definition File File Type MCA Input Definition Editor Version V2 0 Figure 30 The File Info Display The key piece of information here is the File Descriptor which is the extended file name that you added when the file was originally saved From this you should better be able to determine if the file you selected is the one you want When you re finished with the file details click on OK to return to the Open Dialog Box Now you can either click on the Open button to open the file you selected or select a dif ferent file and view its details Editing the Definition All of the menus and commands available for defining an MCA are also used for editing a definition Just click on the entry you want to change and apply the commands as be fore When you ve finished editing the definition Save it 46 Using MCA Definition Tables The New Command If you want to create a totally new MCA Definition the File menu s New command clears the definition table so you can begin a new definition Because New i
36. changes Be sure to click on the OK key to accept the changes Defining an MCA Power Management for input DET01 Power mode Acq delay Standby delay OBatt Full 60sec a Batt Save QAC Full 0 x ami Figure 25 The Power Management Settings Dialog Power Mode The Power mode controls let you switch the InSpector s operating mode Aca The Battery Full mode keeps the electronics on at all times using power from the instrument s batteries The Battery Save mode minimizes battery drain by turning off some of the InSpector s circuits whenever possible When data acquisition is initiated the system changes to the Battery Full mode and data acquisition begins after the Acquisition Delay time has elapsed not available on the Nal InSpector This allows time for the high voltage to reach its preset value and for the internal electronics to become thermally stable When acquisition is finished the system returns to the Battery Save mode In the AC Full mode the InSpector operates from battery port A If the AC Power Adapter is connected to this port it will supply power to the InSpector The AC Adapter s User s Manual tells you how to connect it to the battery port with the supplied connecting cable If ac power is lost the Power Manager will automatically switch to port B allowing its battery to continue supplying power When ac power is restored the Power Manager will switch back to port A Delay The Acq D
37. ctor is to create an MCA Input Definition MID In most cases you ll want to use the MID Wizard which will help you set up your MCA Input Definition easily and quickly In some cases however the definition will have to be created manually in the MID Editor which is covered in detail starting on page 24 The MID Wizard To use the MID Wizard open the Genie 2000 folder and select the MID Wizard icon to see the Step 1 screen Step 1 The first screen Figure 7 lets you select the MCA you want to create a definition for Choose the InSpector MCA then select the Next button Note Figure 7 shows the MID Editor s Add MCA dialog for Genie 2000 V2 1 and later Earlier versions of the MID Editor do not group MCAs by board type MID Setup Wizard Step 1 Select MCA To start select an MCA device from the list below r Available MCAs E Network MCAs El Q USB MCAs BAY 85232 MCAs M Desktop InSpector rM DSA1000 via D1K 232 Spector InSpector 2000 via 12K 232 Nal InSpector 6 Plugin Board MCAs em IEEE 488 MCAs off Unknown MCAs lt Back Next Cancel Help Figure 7 Step 1 22 The MID Wizard Step 2 The Step 2 screen will ask you to define the InSpector s address and Full Memory as signment as shown Figure 9 MID Setup Wizard Step 2 Enter COM port and baud rate for the MCA MCA Full Memory O Ox Ok Ok O18 r COM Pot 3j m Baud Rate COM1 y 19
38. documents including the freight bill invoice and packing list Software License When purchasing our software you have purchased a license to use the software not the software itself Because title to the software remains with us you may not sell distribute or otherwise transfer the software This license allows you to use the software on only one computer at a time You must get our written permission for any exception to this limited license BACKUP COPIES Our software is protected by United States Copyright Law and by International Copyright Treaties You have our express permission to make one archival copy of the software for backup protection You may not copy our software or any part of it for any other purpose Revised 1 00
39. ector shuts down Good means that at least one battery s voltage is gt 5 8 V Warning means that the voltage of both batteries or just one if only one is connected is 5 8 V RAM Batt Back The RAM Batt Back line shows the condition of the internal lithium battery used for maintaining data in the spectrum memory when the InSpector s power switch is turned off This battery with an operating life of at least five years is in a socket on the InSpec tor s MCA Board When its status changes from Good to Disc discharged replace it with a Panasonic CR2025 battery or equivalent 12 V Fault The 12 V Fault status tells you that because there is an an overload on the 12 V or 12 V power supply the Power Manager has put the supply into a Power Save condition The most likely cause of this is that the preamplifier connected to the rear panel Preamp con nector requires more power than the InSpector can supply The proper remedial action is to disconnect the preamplifier s power cable and change the power mode to Battery Full or AC Full If successful the fault will be cleared Rear Panel Connectors TP101 Amp This test point monitors the InSpector amplifier s output At this point a full scale signal is 7 V When using this test point connect the scope ground to any convenient un painted chassis point on or any access screws on the bottom of the InSpector J101 HV This SHV connector provides detecto
40. elay control not available on the Nal InSpector which is enabled only in the Battery Save mode sets a delay time which holds off actual data acquisition until the high voltage has reached its preset value and the internal electronics are thermally stable A minimum delay of one minute is provided to allow the high voltage to increase to its preset value and the internal electronics to warm up The internal electronics will stabi lize to within 0 146 of their final settings in less than five minutes 41 MCA Input Definition Standby Delay The Standby delay control enabled only in the Battery Save mode sets the amount of time that the system can remain idle neither acquiring data nor communicating with the host computer before it automatically changes to Standby In Standby all electronics ex cept the Power Manager are shut down until the next command is received from the host A setting of 0 minutes will prevent the InSpector from switching to Standby Input The Input command is used to change the name of the Input and set up the structure of its memory via the Dialog Box shown in Figure 26 These commands are not available in the Aquisition and Analysis application Define Input Input name DETO1 Input Size channels Detector Type 16384 J Out of Service O Memory groups 1 Figure 26 The Define Input Dialog Note This window s initial focus is on the Cancel button pressing the keyboard s ENTER key after making c
41. ely by replacing the discharged battery with a fully charged one as the Power Manager switches from old to new The Power Manager accessible in the MID Editor or the Acquisition and Analysis appli cation allows you to choose the power mode Battery Full Battery Save or AC Full Battery Full The Battery Full mode provides power continuously to all circuits This may be desirable for quick repetitive acquisition cycles where a stabilization lag time is undesirable The Power Manager Battery Save The Battery Save mode minimizes battery drain by turning off some of the InSpector s circuits whenever possible For example if acquisition is not active the internal signal processing electronics as well as the detector s high voltage bias supply and preamp power are turned off In this mode the host computer can still communicate with the In Spector for instance for data manipulation and read out without power being applied to the entire unit thus greatly extending the life of the battery When data acquisition is started with the InSpector in the Battery Save mode a program mable Acquisition Delay time set in the MID Editor or the Acquisition and Analysis ap plication holds off actual data acquisition until the high voltage has reached its preset value and the internal electronics are thermally stable AC Full The AC Full mode provides power continuously to all circuits from battery port A If the AC Power Adapter is connected t
42. enentry 51 Battery Attaching d leere seep essa 3 Chareer ois 3355 Reb ip res 13 Charging s ix due e be IER 3 Charging Aida SEI 13 Discharge cs isset REIR PRI RE 13 Expected charge life o ooo o o o o 20 Install dicos mirarte 3 Locations aa herd il adi TAS 9 LOW SENSOR eoeyno a E EE debs tie does 13 Power modes os oe eee ren 19 41 Refreshing sii eer ae when nek ae 13 Replacing with the adapter 13 Standby mode oooo ooomooocmoomoo 19 Status indicators lese ooo 9 Status screen entry lle esses 51 Baud rate AULO SENSING idas uq 32 A t ieReTERROC ER epa 32 Cable CODIDUteE ov airada de 5 Connections sis iia 4 ENCON ads PESE id do 7 High voltage ptos 8 A hDut rei Ren AA 8 Preamp composite connecting 6 PFEAINP power dm PRESE 7 DIOE Lem 8 Centroid Gain zero function of ooo 16 Changing The inputs names eesis miite peiie k 42 Charge life of battery 20 Charger Dattery os 39 poe LS as 13 Charging the batteries 3 13 Coarse gain amplifier 38 Com port selecting 32 Communications port selection 32 Complete system componentS 3 Components Basic Systemi 2ocesei eR IRA ER RE RAS 2 Complete systems oss oce sairia eiei ia 3 Composite cable connecting 6 Computer Cable connecting the is ecesssiri secesi 5 Connector pinout
43. ers don t work well at such fast data transfer rates In addition most notebooks have a smaller communications buffer which means that even if capable of a high baud rate they will slow down dramatically if asked to communicate with another device such as a printer while the InSpector is acquiring data Interestingly trying to run at a rate that is too fast actually slows the system down This is because the communications circuitry is not keeping up drops characters errors are generated and the system retries The repeated retries consume considerable CPU re sources Under these circumstances a system that may update the screen in 2 1 2 seconds at 19 2 kbaud may slow down to 10 20 seconds at 57 kbaud or in extreme cases may lose communications entirely You can optimize your InSpector s communications by making several trials to look for the best performance Start at a high baud rate and if you don t get performance as good as or better than the table below try a lower rate Repeat this until you see an improve ment Be sure the tests are made under your standard operating conditions For example if you are going to print while acquiring data you will probably need to lower the baud rate The same is true if you are using the S500 Genie 2000 Basic Spec troscopy software with its copy protection key instead of the 504 InSpector Basic Spec troscopy software 21 4 MCA Input Definition The first step in using your InSpe
44. ese conditions are true you can load as many Input Definitions as you like If you try to load an Input Definition which contains a duplicate Input name the system will display a message telling you that the requested Load can t be done Unloading the Database Though some of the programmable front end controls such as ADC Gain or Amplifier Gain are initially set with the MCA Input Definition Editor many may also be adjusted in the Acquisition and Analysis application while you re collecting data These adjust ments can be stored in the database with File Save and when you Unload the data base are saved in an Input Definition File for future sessions The Unload Process To unload a Database click on the Database menu s Unload from command which will bring up the Dialog Box shown in Figure 33 If several choices are listed there are multi ple definitions in the database 49 50 MCA Input Definition Unload Definition from Database File Name Figure 33 The Unload From Dialog Click on the one you want to unload then click on the Unload from button Note that this menu item is disabled if the MCA Runtime Configuration Database is currently be ing used by another application A Technical Information Status Screen Entries Though the majority of the entries in the Status Report are direct reflections of the MCA Input Definition Editor settings or the Acquisition and Analysis applicationn s Adjust settings
45. hanges in this dialog box will cancel the changes Be sure to click on the OK key to accept the changes Input Name The default DETnn name is the name displayed here allowing you to easily change it to a more meaningful name such as H20Sampl up to a total of eight characters Detector Type Use this drop down list to select the type of detector to be used with this MCA this also assigns appropriate default values to the spectrum display and analysis parameters 42 Saving the Input Definition Input Size This parameter defaults to 8K the number of channels assigned during Device setup for the MCA on the assumption that you ll be using Full Memory for your data acquisi tion To use less than the maximum available memory size use this control to select the size you want to use For instance for Nal spectra you wouldn t want to use more than 1024 channels Out of Service This Check Box allows you to place this Input temporarily out of service That is it will remain as an entry in your MCA Definition File but will not be available for data ac quisition It is meant to be used when the MCA or its front end electronics are tempo rarily disconnected Saving the Input Definition Having completed our definition the next step is to save it in a disk file so it can be used in the future To remind you that you need to do this you ll see an asterisk in the Ti tle Bar next to the name of the current defi
46. hown in Figure 18 you use the Device Driver drop down list to select either the programmable InSpector Amplifier or an external Manual Amplifier Defining an MCA Amplifier for input DETO1 Device Driver Protocol Driver Inspector Amp Inspector Serial Control zo Marial Programmable Internal MCA Figure 18 The Amplifier Device Dialog The Settings The commands in the Settings menu shown in Figure 19 set the operating parameters for the InSpector s MCA and front end electronics Settings Mca ADC MaRa Stabilizer Amplifier High Yoltage Power Mgmt Vacuums Input Figure 19 The Settings Menu 33 MCA Input Definition Many of the parameters can be adjusted both in the MID Editor and in the Acquisition and Analysis application The descriptions of each of the parameters specifies which con trols can be changed only in the MID Editor MCA The InSpector MCA does not have any adjustable controls ADC Click on ADC to see the Dialog Box shown in Figure 20 which is used to set the initial operating parameters for the InSpector s programmable ADC ADC for input DET01 ULD Zero Ed SS 5 00 5 00 Figure 20 The ADC Settings Dialog Since the ADC s controls may need to be changed often in the course of daily work they can be adjusted both here and in the Aquisition and Analysis application Note This window s initial
47. ion in process is not in terrupted When a battery is installed the Power Manager will compare it to the other battery to de cide which is the one with the lower voltage and will select that one as the power source The test for lowest voltage is also made when either the Battery Full mode or the Battery Save mode is first selected 19 Hardware Operation Battery Charge Life How long a pair of fully charged batteries will provide power depends on the Power Manager mode nthe Battery Full mode two fully charged batteries will last a total of about three hours nthe Battery Save mode the batteries can operate for at least 24 hours nthe Standby mode they can operate for more than 80 hours Note that though no current is drained from the batteries when the InSpector s power switch is off they will lose their charge within about 90 days because NiMH batteries don t retain a charge for very long Tuning the Display Environment 20 The InSpector s performance is most affected by the communications burden being placed on the system The more communications you demand of your system the slower the response will be For instance the software is at its busiest when the InSpector is ac quiring data and scaling it for display To get the absolute best performance set your system up as follows Under Display Preferences set the plot mode to Normal Plot which is meant to be used during data acquisition Using the
48. lay shown in Figure 31 If you click on a line in the list you can use the Device and Settings menus to look at details of that definition Click on OK to close the View window 47 48 Inspector Inspector MCA Input Definition View Runtime Input Definition Database Input Size ADC MXR Stab Amp HV DETO1 8192 1P 1P 1P DETO2 4096 1P 1P 1M Figure 31 Viewing the Database Loading and Unloading Definitions Before you can use an MCA Definition you ll have to load it into the database so we ll start with that process Note that you can t edit a loaded database you ll first have to un load it as described in Unloading the Database on page 49 The Load Unload functions will be disabled while any Acquisition and Analysis applica tions are running and have open datasources This prevents one user from altering the runtime database while another user is accessing it Loading the Database A new Definition can be loaded into the Database with the Load to command which brings up the Dialog Box in Figure 32 which lets you choose the file to be loaded into the database Using MCA Definition Tables Load Definition to Database Figure 32 The Load To Dialog Loading Multiple Definitions Though you will usually use only one definition at a time there may be times when you want to load more than one definition To do this be sure that each of the Input names in the Definition Files is unique As long as both of th
49. m the keyboard then accepted with the Ok but ton within the control Defining an MCA Gain and Zero Window Controls These controls set the width in channels of the upper and lower sampling windows for each Mode The stabilizer uses this setting as its sampling range Gain and Zero Spacing Controls These two controls set the spacing in channels between the upper and lower sampling windows for each Mode The windows should be placed so that a shift in the peak re flects a significant change in the count rate through the respective windows For example for broad peaks it is not advisable to choose a window with narrow spacing Gain and Zero Mode Controls The Stabilizer s Gain or Zero or both can be set to Off On or Hold If the drift in either mode zero or gain exceeds the Correction Range the overrange flag will be set and that mode will be changed to hold Set that mode to off to clear the overrange flag then correct the cause of the excessive drift before returning the mode to on On enables stabilization for the specified mode allowing the Stabilizer to compare the incoming data to the Mode s Centroid and Window settings then compensate for data below or above the Centroid Off disables stabilization for the specified mode and sets the correction adjustment to zero and clears the overrange flag if it was set Hold disables stabilization for the specified mode but maintains the current correction at the Stabilizer
50. mber that this display as well as many others in this chap ter are examples of what you might see your display may not be identical Interpreting the Definition Entry As you can see in Figure 14 adding the entry put more than just the name of the MCA in the definition table We ll take a brief look at the other items in the entry now As we get further into the definition process we ll cover them in greater detail Note the letter fol lowing the unit number in each Definition Table item an M indicates a manually con trolled unit and a P indicates a programmable unit wa IT A File D MCA Stab Amp HV Inspector 8192 1P Figure 14 An InSpector Has Been Added to the Table MCA This is the type of MCA device being used for this particular entry in the table Building an MCA Definition Input This is the name that will be used to refer to this specific hardware entry in the table The MID Editor automatically assigns these names sequentially as DETnn starting with nn 01 As we ll see in Input Name on page 42 you can easily change these names to something you find more meaningful Size This is the number of data channels assigned to this input ADC This column displays the type of ADC associated with the MCA MXR This column is for multi input hardware it doesn t apply to the InSpector Stab Stabilizer This column describes the Stabilizer associated with the MCA Amp This column describes the A
51. mp Type on page 39 for instructions on selecting the system s preamplifier type Anexternal amplifier In this case you must select an external amplifier for the system refer to Amplifier on page 32 for instructions on selecting an extermal amplifier This bypasses the InSpector s internal amp and presents the signal which must be a positive unipolar or bipolar pulse with a O to 10 V amplitude directly to the internal ADC The High Voltage Connector Connect the cable s SHV connector to the preamp s High Voltage Input connector HV Inhibit Connector Connect the cable s Green inhibit connector not included on the C1712 cable to the preamp s HV INHIBIT connector if any This signal shuts down the high voltage supply if the detector warms up Reset Connector If your system includes a Model 2101 TRP Preamplifier connect the cable s Blue reset connector only on the C1714 cable to the preamp s INHIBIT connector With the system properly connected and powered up the amplifier s output will be seen at the InSpector s rear panel AMP test point If there is no output the 2101 preamp s In hibit pulse width may be set incorrectly For instructions on adjusting the 2101 s Inhibit pulse width for proper operation refer to Adjusting the TRP Reset Pulse in Appendix D Technical Information of the G enie 2000 Operations M anual Grounding the System It s not necessary to ground the InSpector system in most applications H
52. mplifier associated with the MCA HV This column describes the High Voltage Power Supply associated with the MCA Deleting an MCA If you change your mind and want to remove an MCA that you have added to the defini tion you can do it easily by 1 Clicking on the table entry you want to delete to select it 2 Clicking on the Delete MCA command in the Edit menu When you do that the Dialog Box shown in Figure 15 will pop up Click on OK to remove the entry 29 MCA Input Definition Delete MCA Delete the following MCA and its inputs MCA Input Size ADC MXA Stab Amp HV 8192 1P Figure 15 The Delete MCA Dialog Defining an MCA This section discusses setting up an InSpector MCA which has a fully programmable front end That is its Amplifier ADC Digital Stabilizer Power Manager and High Volt age Power Supply are all controlled from the PC rather than manually with front panel knobs and switches To begin click on the MCA entry in the Definition Table that you want to set up Device Setup The Devices menu shown in Figure 16 sets the parameters for the InSpector s MCA and Amplifier Those Devices which are disabled grayed do not have any settable parame ters 30 Defining an MCA Devices Amplifier Figure 16 The Device Setup Menu MCA The MCA command in the Devices menu pops up the Dialog Box shown in Figure 17 MCA for input DETO1 MCA Full Memory Ladko Lrzk o LSdk O EA Tie
53. nition The asterisk means that the definition has been changed but not yet saved To save your definition click on the File menu s Save command When you do that you ll see the Dialog Box shown in Figure 27 CAUTION If you have changed an existing Input Definition saving it will set its calibrations to default and will clear the Acquisition Start time Figure 27 The Save as Dialog 43 MCA Input Definition Save and Save As Even though you selected the Save command you ll notice that the Dialog Box is labeled Save As This is because the Save command is really a Replace the old version with a new one command and we don t have an old version of our table to replace ours is still labeled Untitled which means it has never been Saved The system realizes this and automatically pops up the Save As Dialog Box so we can assign a name to our table Using Save As Since the word Untitled displayed in the File Name Text Input box is already high lighted all you have to do to replace it is type any legal file name then press the TAB key to move to the File Descriptor input box The File Descriptor The text cursor is now located in the input field called File Descriptor This a 32 character description that is stored with your file to make it easier to locate it when you want to use it again Changing the Summary View Before going on to see how to edit an existing Input Definition Table one that you ve built pre
54. o the InSpector s battery ports 1 Looking at the back of the InSpector hold one of the batteries so that its curved surface is facing you and the brand name is to your left 2 Asshown in Figure 1 place the battery on the battery port so that its mounting slots are slightly above the port s mounting tabs then press in and down to engage the battery 3 Be sure that the top of the battery has been pushed in past the retaining thumb clip at the top of the battery port so that it will be held tightly against the port s electrical contacts Setup and Configuration Connecting the System This section provides step by step instructions for connecting the system cables to the In Spector s three rear panel connectors Figure 2 Pin recepticles E 1 r 1 D 1 r 1 1 t 1 1 Figure 1 Attaching the Batteries Connecting the System The Computer Cable The 600 cm Model C1715 2 Computer Cable the one with a 9 pin connector on each end carries computer commands and spectral data between the computer and the InSpector COMPUTER QE e o ird o o e PREAMP Figure 2 The Rear Panel Connectors Connect the cable between the InSpector s rear panel COMPUTER connector and your computer s communications COM port connector Note Since most laptop computers have power management features which shut off power to non essential circuits be sure that the power to your laptop computer s serial port is on befo
55. o this port it will supply power to the InSpector Refer to the AC Power Adapter s manual for complete instructions on its use If ac power is lost the Power Manager will automatically switch to port B allowing its battery to supply power When ac power is restored the Power Manager will switch back to port A Standby The battery save mode has an adjustable Standby Delay enabled only in the Power Save mode available in the MID Editor or the Acquisition and Analysis application which sets the amount of time the system can remain idle neither acquiring data nor communi cating with the host computer before it automatically changes to Standby In Standby all electronics except the Power Manager are shut down until the next command is received from the host When the command is received the InSpector automatically returns to the Power Save mode Battery Selection When the InSpector s power switch is first turned on the Power Manager uses the bat tery with the lowest voltage charge first or battery B if both are equal unless the Power Manager is set for the AC Full mode as described above The Power Manager continues to use the battery with the lowest voltage until it becomes discharged then switches to the other battery to maximize operating and charging time Removal of a bat tery is immediately detected and if the removed battery was the active one the Power Manager switches to the other battery so rapidly that data acquisit
56. ols multiply the coarse gain setting to yield the final gain setting of the amplifier The super fine gain control can be used to establish a specific gain energy per channel Shaping For the ADC to be able to process the input signal the amplifier must do more than am plify it it must also change the shape of the signal The InSpector offers two shaping modes Fast approximately 1 us shaping time constant for a sodium iodide detector and Slow approximately 4 us shaping time constant for a germanium detector PUR Pulse pileup is a condition where two pulses from the preamplifier are so close together in time that the ADC could see them as one When PUR is on these piled up pulses are ignored by the ADC and a correction is provided to the InSpector s Live Timer circuit Input Polarity The amplifier s Input Polarity control allows you to match the polarity of the amplifier s Input to that of your preamplifier s output signal Preamp Type The InSpector can process step inputs from a Transistor Reset Preamplifier TRP or tail pulse inputs from a Resistor Capacitor RC preamplifier Pole Zero The InSpector s amplifer can be either automatically or manually pole zeroed Auto P Z The START control initiates automatic pole zero which performs a set of iter ative calculations and adjustments to match the preamplifier output to the amplifier input Manual P Z In some unusual circumstances the auto pole zero may fail to c
57. onverge to an optimal value The slider control allows you to manually adjust the pole zero setting For specific information on how to perform a manual pole zero refer to Manual Pole Zero in Appendix D Technical Information of the G enie 2000 Operations M an ual Programmable Electronics Inhibit Polarity TRP preamps output an inhibit reset signal which turns off the amplifier and the ADC when the input signal is invalid This control allows you to match the polarity of the In Spector s inhibit input to the polarity of the TRP preamp s inhibit output signal The ADC The InSpector s ADC receives the amplifier s output pulses sorts them by amplitude and stores each converted pulse in memory building a histogram of spectral data The ADC has four programmable controls Conversion Gain LLD ULD and Zero Conversion Gain One of the factors affecting the generation of a pulse height spectrum is the system reso lution or conversion gain that is the number of discrete voltage levels or channels into which the input pulses will be sorted For instance a conversion gain of 8192 sort ing the inputs into 8192 discrete levels has twice the resolution of a conversion gain of 4096 LLD ULD The InSpector s MCA contains a circuit which examines each input to see if is greater in amplitude than the LLD setting and lesser in amplitude than the ULD setting Inputs which are within this energy window are converted by the
58. ou can set the HVPS to Armed or Off If Armed is selected the HVPS will be automatically turned on when acquisition starts Reset When a fault caused by an overload or an Inhibit occurs the HVPS will be turned off Af ter the fault condition has been cleared click on Reset to reset the HVPS then turn it on again with the Status control The Stabilizer The InSpector s programmable digital stabilizer provides both zero and gain stabilization in applications involving long count times or high count rates It accomplishes this by us ing reference peaks in the spectrum and correcting the ADC s conversion gain or its zero intercept or both to keep these peaks from drifting The stabilizer can be turned On or Off or set to Hold in the MID Editor or the Acquisi tion and Analysis application Putting the Stabilizer on Hold lets the software remem ber the Stabilizer s adjustments for successive counts provided the operating conditions are similar The Stabilizer s programmable controls are Gain and Zero Centroids Gain and Zero Window width Gain and Zero window Spacing Gain and Zero Mode Gain and Zero Rate Divisors and Correction Range for the gain Figure 6 shows the relationship be tween the Stabilizer s Centroid Window and window Spacing on a typical peak Gain Centroid This control sets the reference channel at the high end of the spectrum for gain stabiliza tion since gain drift is more pronounced in the upper channels
59. owever in ex treme environmental conditions the InSpector might be susceptible to oscillations or noise due to ground loops radio frequency interference RFI or electromagnetic inter ference EMI When grounding the InSpector is required a ground connector can be at tached to any of the screws on the bottom of its case all of these screws make positive electrical contact with both circuit and chassis ground 3 Hardware Operation This chapter introduces the InSpector s indicators and programmable electronics and de scribes the purpose and use of each of the InSpector s functions Power Switch The InSpector s power switch is located on the left side of the unit toward the rear In the on position the batteries are load tested and continually monitored with their status shown by the InSpector s front panel battery indicators Two external NiCd batteries sup ply operating power to the InSpector while an internal lithium battery retains spectral data in the memory even when the power switch is turned off The Status Indicators The InSpector s front panel status indicators Figure 4 show the state of each of the two batteries the acquisition status and the high voltage status Battery Indicators The status of the two batteries is shown by the color and state of the A and B indica tors on the left side of the front panel Steady Green The battery has a charge and is not in use Blinking Green The ba
60. r bias The HVPS programmable range is 1300 V at 500 LA 5000 V at 100 LA 5000 V at 100 pA J102 Preamp This 13 pin Cannon DBM53513 1643 connector provides signal connections and power for the detector s preamplifier 52 Rear Panel Connectors Pin Signal Description A1 Coax Energy In A2 Coax TRP Reset In A3 Coax HV Inhibit In 1 Gnd Ground 2 Gnd Clean Ground 3 No connection 4 12V 5 at 80 mA max 5 x Reserved 6 24V 5 at 30 mA max 7 24 V 5 at 40 mA max 8 E No connection 9 12V 5 at 30 mA max 10 No Connection Maximum total preamp power is 2 4 W J103 Computer The computer connector is a 9 pin male D type connector Pin Signal Description 1 No connection 2 TX Transmit Data Out RS 232 3 TX Receive Data In RS 232 4 No connection 5 Gnd Ground 6 No connnection 53 Technical Information Pin Signal Description gt RTS Request to Send In RS 232 no function Clear to Send Out RS 232 B Lis Space High 9 No connection Shield Gnd Ground Autobaud protocol at startup to determine baud rate 1200 9600 19 2 k 38 4k 57 6k or 115 2 k 8 data bits even parity 1 stop bit B Specifications Input Output DETECTOR Rear panel weather resistant quick disconnect signal and power connec tor containing the following signals A
61. re trying to communicate with the InSpector More than One InSpector in the System If you have more than one InSpector each one will have to be connected to a different com port such as COMI and COM2 Each InSpector must be set for the com port that you are connecting it to This is done in the MID Editor refer to Com Port and Baud Rates on page 32 for more information Setup and Configuration The Composite Cable The Composite Cable carries high voltage and preamplifier power from the InSpector to the detector system and control and energy signals from the detector system to the In Spector Although this is a specially shielded cable Canberra recommends that it be routed away from interfering signals If there is a nearby computer display with a CRT tube do not run the cables in front of it There are several possible types of Composite Cables all similar to the cable shown in Figure 3 Each one is designed for use with a specific application and is described and differentiated in one of the following paragraphs To Detector To InSpector Figure 3 A Typical Composite Cable Connecting the System Standard Cable C1711 Cable The C1711 cable shipped with your InSpector unless you have specifi cally ordered one of the other cables can be used for most applications This cable which is designed for use with a slimline cryostat includes the preamp Power Energy HV and HV Inhibit connectors Optional Cables C1712
62. rre Rake 26 New definition 0 0 47 Saving a definitiON ooooo ooooooo 43 Summary View 00 0000 eee eee 45 Using an MCA definition 25 MID wizatd sates ra ee eee ee eae 22 Modes power llle 41 Modes power lens 19 Multiple InSpectors connecting 5 MCA configurations 04 25 Opening An input definition file 45 Outofservice o 43 Overrange clearing 37 Pinouts connector 52 Pole zero SS AA eme 9s 14 Power Adapter dese ewes iota de dere 13 Cable preamp connecting 7 Switch v2 04 vci obese ee me eere 9 System Meis ioa cue ii Rp ipse 13 USING aC ose de 13 Power manager Acquisition delay sls esses 41 Standby delays cios ocio Pere ERR 19 Power management See Power manager Power manager ModeS unidas bea dre eb eR es 19 41 Purposeof 2s eco oes eee eu 18 Power Manager Standby delay ooooooooooommo oo 42 Status screen entry cccp rocissa ciei 51 Power mode control 41 Preamp Selecting the type oooooocmmocm 39 Types supported see RR E he 2 14 Preamp connector pin0Ut 52 Preamplifer cable connecting 6 Printing An input definition 00 47 Pulse pileup rejector See PUR 65 PUR Amplifier contol sercante n a 39 Function Of
63. s a destructive operation selecting it will cause the program to ask for a confirmation in one of two ways 1 Ifthe Definition currently being displayed has not been changed since it was last saved no asterisk in the Title Bar you will be asked if you want to erase the current Definition Click on OK to erase it or Cancel to return to the Input Definition Editor 2 Ifthe Definition currently being displayed has been changed but not saved you will be given a chance to save it The Input Definition Report The File menu s Report command always saves to a disk file but if you click on Yes in the dialog box that pops up you can send the report to a disk file and print the report as well Click on No to save it to a disk file without printing the report Using MCA Definition Tables The whole purpose behind building MCA Input Definitions is to let the InSpector know the number and types of MCAs you ll be using with your system You do this by loading one or more MCA Definition Files into the MCA Runtime Configuration Database This database is shared by all of the programs which make up the InSpector software package and is used by those programs to gain access to the actual MCA hardware in your system In this section we ll take a look at the procedures used for setting up that database Viewing the Current Database To view the current contents of the database click on the Database menu s View com mand which will pop up the disp
64. sts of and the next section tells how to define the InSpector MCAs The remainder of this chapter discusses how the definition is saved to a disk file how a definition can be edited and how to use a definition by loading the file into the MCA Runtime Configuration Database Adding an MCA The Edit menu shown in Figure 12 is used to add MCA hardware to or delete MCA hardware from an MCA Input Definition 26 Building an MCA Definition Add MCA Figure 12 The Edit Menu To add an MCA click on the Add MCA command in the Edit menu which will pop up the Add MCAs to Definition Table Dialog Box Figure 13 shows a typical Add MCA list box allowing you to add an InSpector MCA to the MCA Definition Table You can add more InSpector MCAs to the definition at any time with this command Pa Add MCA s to Definition T able AccuSpec B AccuSpec Nal AccuSpec Nal Desktop InSpector InSpector Nal InSpector Add Figure 13 The Add MCA Dialog 27 MCA Input Definition To add an MCA to your definition you can l Click on your choice then click on the Add button or 2 Double click on your choice Either way you ll see an entry added to the MCA Definition Table for each such selec tion you make When you ve added your MCA to this definition click on the OK button to return to the main MID window Figure 14 shows the result of using this process to add a single InSpector MCA to the Definition Table Please reme
65. tput range for 4 us shaping OVERLOAD RECOVERY Output recovers to within 2 of full scale output from X1000 overload in 2 5 non overload pulse widths at full gain at any shaping time con stant and with preamplifier matching properly set NOISE CONTRIBUTION 3 5 uV true rms output referred to input 4 us shaping and amplifier gain 2150 PULSE SHAPING Near Gaussian shape one differentiator two active filter integra tors realizing five pole shaping network shaping time parameters referenced to 1 us are listed in the following table Performance ADC Shaping Time Multiplier Parameter Gaussian Time to peak 2 85 0 1 full scale output to peak 23 Pulse width at half maximum 2 5 Pulse width at tenth maximum 6 1 Pulse width at 1 100 maximum Lal RESTORER Active gated SPECTRUM BROADENING The FWHM of Co 1 33 MeV gamma peak for an in coming count rate of 2 kcps to 50 kcps and 90 of full scale pulse height will typically change less than 10 with 4 us shaping selected TRP preamplifier These results may not be reproducible if the associated detector exhibits an inordinate amount of long rise time signals COUNT RATE STABILITY The peak position of a Co 1 33 MeV gamma peak for an incoming count rate of 2 kcps to 50 keps and 90 of full scale pulse height will typically shift less than 0 025 with 4 us shaping selected TRP preamplifier CONVERTER 100 MHz Wilkinson CONVERSION GAIN
66. trol oooo oooooo oo 36 Centroid function of o oooooo 16 Mode control oooooooooooooo 37 Rate divisor control o o o 37 Rate divisor function of 18 Spacing control 0 004 37 Spacing function of 17 Window control o oo ooooooo 37 Window function of o ooooo o oo 17 A CANBERRA Warranty Canberra s product warranty covers hardware and software shipped to customers within the United States For hardware and software shipped outside the United States a similar warranty is provided by Canberra s local representative DOMESTIC WARRANTY Canberra we us our warrants to the customer you your that equipment manufactured by us shall be free from defects in materials and workmanship under normal use for a period of one 1 year from the date of shipment We warrant proper operation of our software only when used with software and hardware supplied by us and warrant that our software media shall be free from defects for a period of 90 days from the date of shipment If defects are discovered within 90 days of receipt of an order we will pay for shipping costs incurred in connection with the return of the equipment If defects are discovered after the first 90 days all shipping insurance and other costs shall be borne by you LIMITATIONS EXCEPT AS SET FORTH HEREIN NO OTHER WARRANTIES WHETHER STATUTORY
67. ttery is currently supplying power Blinking Red The battery is currently supplying power but its charge is very low e Steady Red The battery is not supplying power and is low or nearly discharged it is ready to be removed and recharged e Off Both batteries are completely discharged or no battery is connnected to this port or the power switch is off Battery Locations Looking at the rear panel battery A is on the right and battery B is on the left If you are looking at the front panel each battery is on the same side as its indicator For instance indicator A is on the left and its battery is directly behind it Hardware Operation Joyealpu uonisinboy g pue v 1ojeotpu AH sjojeoipu Aleyeg YOLIdIGN ial 08 Figure 4 The Inspector s Front Panel 10 The Connectors Acquisition Indicator When data acquisition is active the ACQ indicator on the right side of the front panel glows High Voltage Indicator When high voltage is present at the rear panel High Voltage connector the HV indicator on the right side of the front panel glows The Connectors Figure 5 shows that in addition to the two battery ports which are described in The Power System on page 13 the rear panel has four connectors HV high voltage Com puter Amp and Preamplifier The InSpector s connecting cables are discussed in more detail in Connecting the System on page 4 HV The high voltage cable which is
68. um and correcting the ADC s conversion gain or its zero in tercept or both to keep these peaks from drifting The count rates in these reference peaks should be high enough to be significantly more than the background in their cho sen stabilizer windows Selecting the Stabilizer command pops up the Dialog Box shown in Figure 21 Some of the controls shown in the figure may not be available on your InSpector Figure 21 The Stabilizer Settings Dialog 35 MCA Input Definition Note This window s initial focus is on the Cancel button pressing the keyboard s ENTER key after making changes in this dialog box will cancel the changes Be sure to click on the OK key to accept the changes Figure 22 shows the relationship between the Stabilizer s Centroid Window and window Spacing on a typical peak Spacing i Window Window Centroid Figure 22 Relationship Between Stabilizer Functions Gain Centroid This control sets the reference channel at the high end of the spectrum for gain stabiliza tion since gain drift is more pronounced in the upper channels The centroid s channel number can also be typed in from the keyboard then accepted with the Ok button within the control Zero Centroid This control sets the reference channel at the low end of the spectrum for zero intercept stabilization which prevents interference from the effects of gain drift The centroid s channel number can also be typed in fro
69. ve 5000 volts for a detector requiring no more than 100 uA of bias current such as a germanium detector This automatically changes the upper value for the Voltage Limit and Voltage controls This control can be set only in this Dialog Box it cannot be changed in the Aquisition and Analysis application Voltage Limit The Volt limit control establishes the HVPS s maximum output voltage within the se lected range It must be set before the Voltage control is adjusted This control can be set only in this Dialog Box it cannot be changed in the Aquisition and Analysis application Voltage After setting the Voltage Limit the Voltage scroll bar sets the output of the HVPS be tween the Voltage Limit s minimum and maximum settings The voltage can also be typed in from the keyboard then accepted with the Ok button within the control The Aquisition and Analysis application allows you to adjust the output voltage as well as turn the HVPS on and off and reset it Power Management The Power Management Dialog Box not available on the Desktop InSpector shown in Figure 25 is used to set several of the InSpector s Power Management controls all of which can also be changed in the Aquisition and Analysis application Some of the con trols shown in the figure may not be available on your InSpector Note This window s initial focus is on the Cancel button pressing the keyboard s ENTER key after making changes in this dialog box will cancel the
70. viously and saved to disk there s one more menu to look at This is the Sum mary menu which is shown in Figure 28 Summary Figure 28 The Summary Menu 44 Editing an MCA Definition The Summary menu has two commands By MCA and By Input which change the or der in which the information in the Input Definition Table is displayed By MCA means that the first column of the table will display the MCA type that is being used for each entry If you choose By Input the MCA and Input columns will be reversed in the dis play and the Inputs will be sorted alphabetically You can choose either method but in the case of systems with a large number of inputs By Input is an easier display to understand than By MCA Editing an MCA Definition The procedures that we used in the previous sections can also be used to edit MCA Input Definitions that have already been saved to disk Opening an Input Definition File To edit a file that has not been loaded into the MCA Runtime Configuration Database all you have to do is read it into the Input Definition Editor with the File menu s Open com mand which uses the Dialog Box shown in Figure 29 If you know which file you want to edit double click on its name to open it in the editor Open Definition Figure 29 The File Open Dialog 45 MCA Input Definition If you have already loaded the definition into the MCA Runtime Configuration Database it must first be unloaded before it
71. you just defined will be stored as an MID file named inputname MID and automatically loaded into the Ge nie 2000 s MCA Runtime Configuration Database described in Using MCA Definition Tables in the MCA Input Definition chapter of the Genie 2000 Operations M anual When you select Finish you will be asked if you would like to define another input An swer Yes to define another MID file Answer No to close the Wizard The MCA Input Definition Editor You ll have to use the MID Editor only if you want to change default settings for any of the InSpector s programmable components The remainder of this chapter tells you how to use the MID Editor to make those changes 24 Basic Concepts Basic Concepts We ll begin with some basic concepts that are important to understand before actually getting into the details of how you define your system s MCAs Multiple MCA Configurations Since MCA definitions are saved in disk files you can have as many definitions as you like For example you might have one MCA defined as an 1K Sodium Iodide Spectros copy MCA in one file and another as a 2K Sodium Iodide Spectroscopy MCA in another file Before you start an experiment you simply pick the configuration you want to use Because an MCA definition file can include any or all of the MCAs that are available to your system you can use more than one MCA at a time However each MCA can be in cluded only once in a given definition file and each MCA

1250 InSpector User`s Manual

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