User Manual - Far West Technology, Inc.
Contents
1. Pa ale 5s e 150 95 199 ij gt 1 T an 6 ven 1 5 ii Sg T 7 vze s Yeze 5 1 553 8 a E 222999929227 5 RES alls uere 1 Z A a 5 E 4 Hette S T Y DOA FENAI n E UE NN 05 2 wzenxuz 6rLXVN 13 E 1 40 292 ad 00 sol 225 E ou 2g Wor s qusan ol 285 gial zx ax ST N i zier 1 m een ie 894 Y 2 1 We ieee 002 2 Ved 79 2 20 5 19 T F 5 gE 8 d 29 9540 yer 1 feay t gt z 550 7 D u e m jor e d 25 sin zn p T gorn yLOHvL 5 din 9 DES 1 ir 2 7 Y inora Nus BREE d n 52 FN ok T zee g ce T d T N 2 TE ME N 12. A CALIBRATE THE RAINBOW disi 1 First Time Calibration 12 LLIB X M 12 B ACQUIRE A SPECTRUM weet kD BACKGROUND 2 13 D LOOK REGION OF INTEREST E SAVING THE 13 TRANSFERRING THE DATA 7 7 7 8 7 9 89 13 EXTERNAL COMMUNICATION amp TRANSFERRING 14 DATA STRUCTURE RSEN r 14 SOBA TE RIES fete et te et ee eite c e ae E colors 15 16 A DEADTIME 2 16 BUTTON REPEAT 2 16 PULSER INPUT 2 16 D SUBTRACTING COUNTS 2 16 E OVERFLOW 2 16 E ERROR MESSAGES dde dde 2 16 ADJUSTMENTS 17 INTERNAL SETUP amp 18 C08 ATE YET 18 B WHERE TO PLUG IN THE DETECTOR 18 C JUMPER SETTINGS 2 18 Di SERTAE CONNECTOR 21 XIV FUNCTIONS 5 5 2 999 9 9588888 22 EMERGENGY MEASURES ed tec ds 23 XVIESPEGIFICATIONS neti edad ede e e wie AS 24 XVII SCHEMATICS 2 002 2000 02000000 25 MODEL 7000 RAINBOW A
3. Zal 992912 x asn oen 2 5529 Es 000HvL or 29 Caria popi 2152 BE E m M vizin 4 yr 2a M E 95229 crows T 29 5 T 8 4 Xo 05 solar 3 EX o 7 m yd Sp azsa 9009301 H ics m 8 Se 005 ig 25 Orm DS tH lt a b 5 T 6n A E 9 9 95 viaa 3l annum eu 2 ry asaj yp L Y169XVA 1 2 E as 99 T T e 1533 158 wee Gar gr ve 54 eas 4 lt 2752 aeris NEM isa asa i pr 4708 ud g iasa is RH me 2 255 ahy eas 9 21 aive 6 4 Wee zj 9 1dgr ST 22 8 8 sI A 9 gn Hy n n 8 SF lg 4 877 e 10072 4 1n 52 ra pales NE SNOLINGHSNd 8 wong M E 2 4 d Ws 4 T3NYd mawa 69 55 pe SJA 4 18 1df Figure 12 Digital Schematic MODEL 7000 RAINBOW MCA vegar vien 94 CES 0 94 1 2 e 6 94 fd cS
4. gt SETUP MENU Increases the Gain and expands the spectrum to the right lt SETUP MENU Decreases the Gain and compresses the spectrum to the left lt lt gt gt gt ROI MENU only in expanded mode Moves the whole display Push this button down then push cursor key The whole display will move rather than just the cursor ACQUIRE ACQUIRE MENU reached from MAIN MENU ADC Adc adjustment See Adjustment Section ADD ROI MENU Will add channels to the ROI To add more than just 1 channel move the cursor Push ADD again to stop the cursor from adding channels Or push MENU ADD ROI MENU Push this to add channels to the ROI Will then change to ADD ADD TIME MENU Will change from subtracting counts to adding counts in each channel when acquiring data COMPRESS ROI MENU Changes the display to the compressed mode Shows channels 0 through 960 Each horizontal dot is the average of 4 channels CONTRAST Adjustment is in DARK and LIGHT in POWER MENU DARK POWER MENU Darkens the contrast on the LCD display DEADTIME The clock time is extended to compensate for deadtime losses DETECTOR I O Multiple use connector Use for external detector with external preamp HV pulser connection for internal preamp HV board and external power connection DOWN TIME MENU Lowers the value of the highlighted number by 1 Cursor moves the highlighted number EXPAND ROI MENU Changes the display to show 240
5. t z E zen 1018 27 Figure 14 Optional Preamp HV Board MODEL 7000 RAINBOW MCA INDEX lt 11 lt lt gt gt 9 gt 11 A Acquire Menu 7 9 Spectrum 12 time 7 ADC Setting 16 ADD ADD 10 ALL 10 ROI Menu 10 13 Time Menu 10 ADJUSTMENTS 16 ATTENUATOR 20 B Background Subtract 13 battery ACCESS 4 indication 7 replacement 14 Block Diagram jumpers 9 BUTTON 6 reference guide 8 repeat 6 15 Calibration 12 first time 12 Routine 12 channel number 7 check source 12 COMPRESS 9 computer data transfer See transferring data contrast Emergency setting 22 LCD 11 Cover rear 14 cursor 6 7 MODEL 7000 RAINBOW MCA D DARK 11 Data format 14 Saving 13 transferring 13 Deadtime 15 Bargraph 7 DETECTOR IO 20 Detectors 17 Discriminator 16 DISPLAY 7 compressed 7 contrast 11 expanded 7 DOWN 10 E EMERGENCY MEASURES 22 error messages 15 EXPAND 9 external communication 13 F File Menu 8 9 10 First time calibration 12 format 14 FUNCTIONS 21 G gain 11 amp 19 high voltage 16 GENERAL INFORMATION GLOSSARY 1 H high voltage 16 HV See high voltage input 17 19 J Jumpers 17 Table 9 28 L LCD contrast 11 LIGHT 11 LLD 16 LOAD 10 Main Menu 9
6. ACQUIRE MENU TIME MENU 00076 RUNNING 200 80 00 00 BOOT 000 20 98 Ce POWER MENU 9552 BOOTE 788 8 MENU SCALE SCALE UP RESET START MENU SUBTRACT RESET DWH ue DRRK LCD LIGHT SETUP PuR OFF ROI MENU FILE MENU 208 09 00 00 BP2345678 95 tnm EXPAHD REMOVE PRW OFF SAVE LORD SETUP MENU 6557 6 GR 4895 200 00 00 00 Figure 4 Menu Selection From Main Menu MODEL 7000 RAINBOW MCA 7 Vil MENUS During normal operation there are 6 menus The main menu is identified by the dashes between the words Its only function is to select one of the other menus To get back to the main menu push the MENU button that is always on the left The selections from the main menu are ACQUIRE This allows you to start stop and reset the MCA It also has the scale up and down functions ROI This sets and resets the ROI or Region of Interest The menu allows setting and clearing all of the channels or individually This menu also has the button to expand or compress the display TIME This sets the acquire time It can be set from 00 00 00 to 99 hours 59 minutes 59 seconds If it is set 100 then the time will count up otherwise it will count down and stop acquiring data when it gets to 0 This menu also has a button that will add or subtract counts for backgroun
7. Deadtime Bargraph is 20 is 40 is 80 and is 90 Status C is Compressed display E is Expanded display is count up is count down The display has only 240 horizontal dots and therefore shows only 240 channels either in compressed or expanded form In the compressed display every four channels are averaged and only channels 0 through 960 are shown Thus the channels shown are 0 4 8 12 16 20 etc Channel 0 is the average of channels 0 1 2 amp 3 channel 4 is the average of 4 5 6 amp 7 In expanded display only 240 channels can be seen at once but all of the channels can be viewed by scrolling through the display lt gt and cursor in ROI MENU The channels that are included in the ROI are marked with a dot on the bottom of the graphic portion of the display In compressed display if any of the 4 averaged channels are included in the ROI then the channel is marked as part of the ROI Also in compressed display the ROI counts are true counts and not an average Low battery is indicated by LOW in the upper right corner of the display Contrast is set in POWER MENU The display will sometimes show more than one dot on for each channel This happens with high count rates especially on the lower scale of 50 Change scale to remove excess dots MAIN MENU 6552 BHETG 80888000 200 00 00 00 Cr FCBUIRE RGI TIME FILE POUR
8. External Connectors DB9 Connector for RS 232 Interface DB9 Connector for External Detector BNC Input for use with optional HV Preamp Board MCA Channels 1024 Counts Channel 65 535 Amplifier Gain Digitally adjustable in 4096 steps from front panel ADC Wilkinson type 14 MHz Clock Conversion time 10 us to 150 us Maximum Count rate 210 000 CPS OPERATIONAL Modes Acquire amp View data File Data LIVE TIME Display Background Subtraction Dead Time Correction Region of Interest Set individual channels Storage 13 ea 1024 Channel Spectra Includes Display ENVIRONMENTAL Temperature Range 0 C to 50 C Storage Temperature 20 C to 60 C OPTIONS Options Internal HV Preamp Board Scintillation Probes shoulder strap repair manual MODEL 7000 RAINBOW MCA 24 25 SCHEMATICS XVII
9. There is only one error message When the Rainbow is first turned on it checks the memory If it has been corrupted then it will show an on screen error message that it is programming the memory with default values for scale contrast etc It will not program over any data memory MODEL 7000 RAINBOW MCA 16 XII ADJUSTMENTS There are 4 manual adjustments in the basic Rainbow and one adjustment on the optional Preamp HV card In addition there is the digital adjustment of Gain on the Rainbow SETUP MENU For all of the adjustments except LLD it is best if the Gain in SETUP MENU is set to 4095 Usually only LLD and HV will need adjustment You may need to remove the Preamp HV card to access the testpoints The adjustments are LLD Low Level Discriminator This adjusts the lowest channel that the Rainbow will detect in the spectrum If it is set to channel 100 then the Rainbow will only accept inputs above channel 100 If it is set too low there will be excessive counts or no counts in the lower channels Usually it is set at a minimum of channel 40 to 60 If it cannot be set low enough the zero may be incorrectly set For a preliminary setting turn it 20 turns CCW or until it clicks then 8 turns CW When setting this control raise it high enough to see the cutoff use 50 scale in Acquire Then lower it to the value you want As you lower it close to zero the counts usually increase from background counts and noise as you lower it further t
10. memory data 6 menu Acquire 7 9 File 8 9 10 Main 9 Power 8 9 11 ROI 7 9 Setup 8 11 Time 8 9 10 MENUS 7 O OPERATIONAL 15 overflow 15 Pole Zero 16 POSITIVE NEGATIVE 19 POWER 6 Auto 6 Power Menu 8 9 11 POWER OFF File Menu 10 Power Menu 11 Pulsar Input 5 PWR OFF 11 PZ 16 Q Quick Start 5 R REMOVE 9 MODEL 7000 RAINBOW MCA REMOVE 9 REMOVE ALL 10 Repair Service 3 RESET Acquire Menu 9 Computer 22 Setup Menu 11 10 ROI 7 13 Menu 7 9 5232 13 RUNNING 13 5 SAVE 10 scale 7 11 SCALE DN 9 SCALE UP 9 SCHEMATICS 24 serial port Connection 20 settings 13 Setup 8 11 Specifications 23 Spectrum Acquire 12 START 9 13 Status 7 STOP 9 13 SUBTRACT 10 13 Background 13 T Time 12 acquire 10 Menu 8 9 10 transferring data 13 TYPICAL OPERATION 12 U UP 10 Z ZERO 16
11. 8 94 8 bya ZO S ayzn 9 9 sen N9S 11 1202311 25 2 92 oor A 535 JUS 2 6 dL 4 x a 9zn 5 vide 122A 109110 Figure 13 Analog Schematic 26 MODEL 7000 RAINBOW MCA vain 3 0 a s z 9eem 266 ATOL AWN NNN o veld fee 611N 8 42 T 2 sain S 295 FI D TS E oT an f 2 9114 2010 a Z6EENZ 8 d T 9 e _ au A GGG ols XL ES V oS 62 TA A wo lj I9 NY ino 6 S 1010 13538 Sls 218 2 IBE o s 8 S ior X n 5 2 2 2 e E 7 T SS L 10184 10144 601a dv T sior ut EN 4019 5 7 39 Ae 2700 ae 920 AlddNS Y3MOd FOVLIOA H9IH 5 ear oS AES PE o tw 2 555 lt 8 1 2 4 sysh Vzor 1017 Aue 39 00 01 re rcu M vie 506 5 6 6y ANN
12. ROI is shown by a dot on the bottom of the graph The choices are MENU Back to main menu EXPAND Changes display to show a detail of the spectrum It will display only 240 channels and will center the display on the cursor when it changes to this display Also changes Status in top line to E COMPRESS Changes the display to show almost the whole spectrum 960 out of 1024 channels Also changes Status in top line to lt lt gt gt Push this button and hold it down along with the cursor button and the whole display will move in the direction of the cursor buttons REMOVE Pushing this button will change the button to REMOVE This changes the cursor to an ROI remove cursor Wherever the cursor is moved the channel will be removed from the ROI Pushing REMOVE or MENU will cancel the remove function MODEL 7000 RAINBOW MCA 9 ADD Pushing this button will change the button to ADD This changes the cursor to an ROI add cursor Wherever the cursor is moved the ROI will be added Pushing ADD or MENU will cancel the add function REMOVE ALL Removes all channels from the ROI Visible only when REMOVE is showing ADD ALL Adds all channels to the ROI Visible only when ADD is showing TIME MENU 552 2558 C MENU SUBTRACT UP D TIME MENU This menu sets the integrate time for acquisition If time is set to 00 00 00 then time will increase when acquir
13. are shown in column one The remaining columns may be modified by the tables that follow Yes indicates 1 2 3 4 jumper INTERN EXTERNA EXTERNA EXTERNAL indicates no L PREAMP NIMBIN BIN jumper PREAMP AMP CONNECT DETECTOR Default settings for internal Preamp HV board GAIN The first amplifier has two gain settings Yes indicates jumper NO indicates no jumper The two are INPUT JP6 POSITIVE NO TEST JUMPER repair manual for details EH OPERATION MODEL 7000 RAINBOW MCA 20 ATTENUATOR The input to the post amplifier in the Rainbow has an attenuator DETECTOR I O The DB9 connector marked DETECTOR IO has the following fanout FUNCTION Ground Analog External Preamp Input 5 Pulser Input 6 Switched Battery Positive 5 VDC 5 VDC 9 Ground Digital Serial Connector The DB9 connector marked SERIAL has the following connections FUNCTION 1 Jumper JPX3 Jumper JPX1 Ground Jumper JPX4 No Connection Jumper JPX2 5 VDC The Jumpers JPX1 through JPX3 are all connected together on the circuit board The connections between them can be cut and a jumper connector installed instead The 5VDC is for external use and cannot supply more than 5 mA MODEL 7000 RAINBOW MCA 21 XIV FUNCTIONS GLOSSARY The following will describe each of the functions and words that will appear in the display and on the Rainbow The functions appear alphabetically
14. measuring devices since 1972 REPAIR SERVICE Although we design and manufacture our instruments to a high standard we realize that repairs are sometimes necessary If you believe service is needed on this instrument please call our service department before shipping the instrument to us for repair often we can help you with simple problems If you do decide to return it to us for repair then please include Contact person s name Organization or Company name Address Phone number of contact person Description of the problem Anything else you may think important We will inform you of the repair charges and wait for your authorization before we repair your instrument MODEL 7000 RAINBOW MCA 3 TABLE OF CONTENTS I INTRODUCTION tte SE nga I 5 ASSEMBLY utes I tete ede tangas 5 5 IV BUTTONS co ace c Pe 6 V POWER ON OFF AND AUTO POWER 6 7 E 8 AMAIN MENU kerra E 9 9 C ROLMENU RPM 9 D TIME MENU 2 10 E FILE MENU 2 10 POWER MENU set Gi SETUP RE E E R EE E R EE RRR RE 11
15. plug into the 9 pin DETECTOR I O connector on the side of the Rainbow DETECTOR GO ACCESS INPUT SE Figure 9 Side View of Rainbow Showing the Connectors C Jumper Settings There are many jumpers on the Rainbow They setup the instrument for detector gain polarity attenuation and input connector The following tables describe the settings for the jumpers The default settings shown in column 1 in the General Jumper Table are the settings used at the factory and are also used with the internal Preamp HV board The block diagram shows the signal path for the jumpers MODEL 7000 RAINBOW MCA 18 OPTIONAL PREAMP Figure 10 Jumper Block Diagram Figure 11 Jumper Locations INPUT B B ups mm xa E m JP4 X14 E E JPS ATTENUATOR Low B AMPLIFIER d POS or NEG DETECTOR I O Eme ADC DIGITAL GAIN 1K JP11 i JUMPER lt APPLIED JUMPER BLOCKS JP10 Jpi4 YPM JP15 888 mg JP JPA 4 2 jpet JP4JP5 19 MODEL 7000 RAINBOW GENERAL JUMPER TABLE The table shows the jumper settings for each different configuration The standard settings for the internal preamp HV
16. 096 as full Gain this will allow a routine adjustment of 17 Turn the Rainbow off Remove the bottom cover Locate the high voltage adjustment on the optional preamp high voltage board If you are using an external high voltage control on an external preamp locate the control Turn the Rainbow back on and put it in either ACQUIRE MENU or SETUP MENU Place the check source near the detector Adjust the high voltage until the peak s of the check source fall into an area that you want For example if you are using a CS137 you may wish to put its peak of 660 KeV in Channel 660 While you are adjusting the high voltage you can push the reset button to reset the spectrum so it is easier to see the peak It is usually easier to do this in compressed format Start with the high voltage at a low value and slowly increase it This way you can always see the peak This sets the high voltage and gain 2 Routine Calibration Once the high voltage has been set then use the SETUP MENU for fine adjustments to the peak Place the check source near the detector and check the peak location in any menu you want If it is not where you want it then use the SETUP MENU with the lt and gt buttons to move the peak to the desired channel B Acquire a Spectrum The spectrum is usually acquired in the ACQUIRE MENU The display is typically compressed because it shows most of the spectrum Check the right top corner of the display if has a C in it then itis a
17. CGUIRE ROI T MEF ILE POWER SS eer en ee POWER eV ww Figure 1 Front View of Rainbow l INTRODUCTION The model 7000 is complete multichannel analyzer that is at home in both the field and the lab It will find use in a diverse range of applications because of its portability small size long battery life and low cost It puts an MCA in everyone s hand The software is designed to be easy to use with only a few easy to use menus The softkeys also contribute to its simplicity Some of its key features are m Live Time Display m Small size Long Battery Life m 1024 Channels m Large LCD graphic display m Flexible preamp hv connection This manual covers only the operation of the Rainbow It does not teach nuclear spectroscopy Il ASSEMBLY If you have bought the Rainbow with the optional preamp hv card it is already installed Plug a scintillation Nal detector into the BNC on the side of the Rainbow If you have another type of detector see the section on INTERNAL SETUP amp CONNECTIONS The batteries are already installed Il QUICK START Turn the Rainbow on by pushing the power button on the front panel Push ACQUIRE to change to the acquiring data menu and push START to start gathering data The SCALE buttons will increase and decrease the vertical scale The MENU button will always get you back to the main menu that you can identify by the dashes between the words You can save the data und
18. ERGENCY MEASURES Try the following if 1 The Rainbow quits and will not function and the batteries are good 2 The display shows gibberish 3 Any other function that does not seem to operate correctly COMPUTER RESET Hold down the POWER button button A for about 15 seconds then release it This action resets the microprocessor inside the Rainbow You can do this at any time that the Rainbow is operating It will not change the memory and initiates the same actions as turning on the Rainbow If the display is not showing any characters it may be that the contrast is set too low to show anything In that case try EMERGENCY CONTRAST To set the emergency contrast hold down button E while turning on the Rainbow by momentarily pushing button A Continue to hold down the E button until the display shows words that are of proper contrast then release button E MODEL 7000 RAINBOW MCA 23 XVI SPECIFICATIONS MECHANICAL Size 9 x 6 W 1 7 8 Weight 3 1 Lb Construction Painted aluminum case with gasketed keyboard ELECTRICAL Display 240 x 64 dot LCD with Contrast Adjustment Keyboard 7 push button switches protected with silicone rubber gasket Batteries 3 D cells will operate Rainbow with detector for 100 hours Low battery indication Will automatically turn off when batteries are too low for proper operation Internal Adjustments LLD ADC Zero Pole Zero Conversion Gain HV on optional Preamp HV board
19. NBOW MCA 10 POWER MENU 0552 99900008 255 C MENU DARK LCO LIGHT SETUP PuR OFF POWER MENU The POWER MENU has many functions It is used primarily in turning the power off It also can adjust the LCD contrast and is the only way to enter the SETUP MENU The choices are MENU Back to main menu DARK LCD Darkens the LCD Display LCD LIGHT Lightens the LCD Display SETUP Changes to the SETUP MENU PWR OFF Turns the power off SETUP MENU 0552 UBGTG GR 4095 200 E MENU RESET SCALE UP lt 5 G SETUP MENU This menu can only be reached through the POWER MENU by pushing SETUP This menu is used to set the gain of the amplifier The Gain is set digitally by the arrow buttons in this mode The Gain will compress and expand the horizontal portion of the display Increasing the Gain will expand the peaks to the right and decreasing it will compress them to the left If the Gain does not go high enough then it will be necessary to increase the high voltage See the section on First Time Calibration The display will show a normal display and it will be acquiring data The scale is set to 50 counts full scale The Gain GN is shown in the top line where the ROI counts normally are It has a range from 0 no Gain to 4095 Full Gain The choices are MENU Back to main menu RESET Resets the time and counts in each channel SCALE increases the scale factor The fa
20. OPERATION MANUAL Model 7000 Rainbow MCA April 1998 Health Physics Instruments 330 South Kellogg Ave Suite D Goleta CA 93117 MODEL 7000 RAINBOW MCA 1 IMPORTANT INFORMATION BATTERIES Cells Alkalines are best RESET Hold down POWER button for 10 seconds then release If this does not work then hold down button E and push the POWER button for 10 seconds Continue to hold down button E until the LCD contrast is correct then release it STRAP CHECK Check the strap periodically to make sure that it is not frayed or damaged Also check that the ends will not come loose DETECTOR When plugging in a new detector the instrument may automatically turn off and you may not be able to turn it on To reset it see RESET above To prevent this turn the Rainbow off when plugging in a new detector SOFTWARE VERSION To check the version of the software turn the instrument on with the B button held down MODEL 7000 RAINBOW MCA 2 RAINBOW MCA Users Guide This manual belongs to Serial Number Date Purchased GENERAL INFORMATION This instrument is manufactured in the United States of America by Health Physics Instruments Suite D 330 South Kellogg Ave Goleta CA 93117 3814 Tel 805 964 3615 Fax 805 964 3162 Email support fwt com Health Physics Instruments is a division of Far West Technology Inc Both Health Physics Instruments and Far West Technology have been manufacturing radiation
21. TUP MENU From Power gt Increases Gain Decreases Gain Table 1 BUTTON REFERENCE GUIDE MODEL 7000 RAINBOW MCA 8 MAIN MENU 0552 39076 00000000 20 89 MAIN MENU The main menu is the pathway to select one of the other menus It can be easily identified by dashes between the words on the bottom line The Choices are Acquire Menu Changes to Acquire Menu ROI Menu Changes to ROI Region of Interest Menu Time Menu Changes to Time Menu File Menu Changes to File Menu Power Menu Changes to Power Menu ACQUIRE MENU 0552 00076 RUNNING 266 MENU SCALE DH SCALE UP RESET START B ACQUIRE MENU Used to acquire and display data The choices are MENU Back to main menu SCALE DN Lower the scale i e show lower part of scale SCALE UP Increase the scale i e show upper part of scale RESET Reset the time and data If it is set to subtract counts this will change to add counts START and STOP Start and Stop acquisition Alternate action If time is set to zero it will acquire data until manually stopped and will show the acquiring time If it is not zero it will count down and stop at zero then reset the time in the display to the preset time Running time is deadtime corrected ROI MENU 552 30876 20 MENU EXPAND REMOVE ADD ROI MENU Used to set the Region of Interest ROI A channel that is part of the
22. channels out of 1024 Will center the display on the location of the cursor FILE FILE MENU reached from MAIN MENU Saves retrieves files or spectrums GAIN Sets the sensitivity of the instrument from the front panel See Setup Menu HV High Voltage Adjustment See Adjustment Section INPUT BNC connector that is used for external detector when used with internal preamp HV board LCD Contrast in the display Light and Dark in POWER MENU LIGHT POWER MENU Lightens the contrast on the LCD display LOAD FILE MENU Loads the highlighted file into the display Will overwrite the existing display Select the highlighted file with the cursor buttons MAIN MENU Starting point for all other menus Identifiable because the words have dashes between them MENU Button A that will display MAIN MENU POWER POWER MENU reached form MAIN MENU Turns power off sets LCD contrast and is only way to get to SETUP MENU PWR OFF FILE MENU and POWER MENU Turns the power off PZ Pole Zero Adjustment See Adjustment Section REMOVE ROI MENU Will remove channels from the ROI To remove more than just 1 channel move the cursor Push REMOVE again to stop the cursor from removing channels Or push MENU REMOVE ROI MENU Push this to remove channels from the ROI Will then change to REMOVE RESET ACQUIRE MENU and SETUP MENU Resets the counts in each channel to 0 and sets the time the preset time MODEL 7000 RAINBOW MCA 22 ROI Region
23. compressed display If there is an E it means an expanded display and you will only see a portion of the spectrum To change between the compressed and expanded display use the ROI MENU The time to acquire data is set in TIME MENU It needs to be set long enough to obtain enough data to show a good spectrum 1 minute 10 minutes or 1 Hr 40 minutes 100 minutes are logical choices If you set the time to 00 00 00 then the Rainbow will acquire data until you manually stop it If you set it to a number then the time will count down in seconds until it gets to 00 00 00 then stop the acquisition and reset the time display to the preset time MODEL 7000 RAINBOW MCA 12 Start acquiring data by pushing the START button The STOP button will stop it You can start and stop without loosing any data Time may be offset by 0 05 seconds for every stop start action Reset will reset the data and time When the Rainbow is acquiring data the ROI section of the display will show RUNNING and the time will change in 1 second intervals C Background Subtract After you have acquired a spectrum you may wish to subtract the background Go to the TIME MENU and push the SUBTRACT button This will change the Rainbow to its subtracting mode The top right hand corner of the display should now show a This indicates it will subtract counts If it shows a then it will add counts Now acquire data for the same time as you did when you originally acquired it b
24. ctor will rollover at the end lt Decreases the Gain gt Increases the Gain The lt and gt buttons have ballistic control The longer they are held down the more they change the Gain MODEL 7000 RAINBOW MCA 11 TYPICAL OPERATION This section will walk through a typical acquisition of a spectrum There are several steps that need to be followed to obtain data Calibrate the Rainbow Acquire a spectrum Background subtract Look at region of interest Saving the data oa won gt Transfer the data A Calibrate the Rainbow It is helpful if you have some idea of the energy of the spectrum that you will obtain Often just the characteristic look of a spectrum is enough to identify different isotopes but often you want to verify the energy of several peaks You will need a check source to set the sensitivity of the Rainbow Usually this isotope is Cesium 137 Cobalt 60 or a lower energy isotope such as Cadmium 109 It should be in the energy range of the intended spectrum 1 First Time Calibration First time calibration is different from routine calibration First time calibration involves setting the high voltage adjustment that changes the gain of the scintillator Routine calibration will probably use only the finer Digital Gain setting in SETUP MENU Turn the Rainbow on and change to the SETUP MENU Through POWER MENU Adjust the Gain using the lt and gt controls until it is at 3500 With 4
25. d subtract FILE Saves or retrieves spectrums from memory There are 12 files and each file stores a spectrum The 13th file is the current display POWER Power off LCD contrast and Setup are all in this menu In addition there is SETUP Accessed only through POWER Setup adjusts the Gain to expand or compress the spectrum horizontally BUTTON BUTTON BUTTON BUTTON BUTTON A B D E ACQUIRE ROI FILE POWER Acquire Menu ROI Menu Time Menu File Menu Power Menu ACQUIRE MENU MENU To Main Menu SCALE DN Decreases Scale EXPAND COMPRESS Display MENU To Main Menu MENU To Main Menu SUBTRACT ADD To each channel SCALE UP Increases Scale lt lt gt gt Move Expanded display quickly RESET Reset time to 00 00 00 RESET Resets the spectrum REMOVE REMOVE Points where cursor moves DOWN Decreases the digit where the cursor is START STOP Acquisition ADD ADD Points where cursor moves UP Increases the digit where the cursor is PWR OFF Turns the power off DARK LCD Darkens the display LOAD SAVE Get file __ P file to LCD OM SETUP PWR OFF Goes to Setup Turns power menu off FILE MENU MENU To Main Menu MENU To Main Menu mo the displa SCALE Changes scale rollovers Changes to REMOVE ALL or ADD ALL when REMOVE or ADD are shown MENU To Main Menu RESET Resets the channels SE
26. e transferred on the RS232 serial connection Connect the serial connector on the side of the Rainbow to your PC computer using a 9 pin RS232 cable Use a communications program to turn your computer into a terminal Communications programs are included in most operating systems The settings for the serial port in the computer should be 9600 baud rate 1 stop bit no parity There is no flow control When the Rainbow is first turned on it outputs a sign on message that you should see on your computer Typing an H or a on your computer will display the help menu All commands must be followed by lt enter gt Only the last command or digits are used The choices are A This will change to the acquire menu and start the MCA acquiring data 5 This will change to the acquire menu and stop the MCA acquiring data R This will change to the ACQUIRE MENU and reset the data and time Thhmmss Sets the acquisition time in HH hours MM Minutes and SS Seconds T30 will set the time to 30 seconds T100 will set it to 1 minute T14000 will set it to 1 hour 40 minutes 100 minutes G Gain Sets gain to xxxx Setable from 0 to 4095 l This will show the counts in the ROI and stop acquisition 6 Shows Preset time Live time and Gain Live time is the time shown in the LCD Xxx This will transfer the file specified by xx Typing D3 will transfer file 3 Typing 12345611 will transfer file 11 File 13 is the current display Vxx This is the
27. er FILE change the ROI Region of Interest and expand the display under ROI change the time for acquiring data in TIME and turn the power off in POWER The Setup menu changes the gain The two bottom buttons will move the cursor left and right To transfer the data and operate the Rainbow remotely connect to a serial port at 19 200 baud and push the H key on your computer for a help menu MODEL 7000 RAINBOW MCA 5 IV BUTTONS The Rainbow is controlled by the 7 buttons on the front panel The bottom line on the display shows the function of the 5 buttons just below the display The two bottom buttons are for moving the cursor left and right These are also used in moving the cursor in setting the acquire time and in file selection All buttons repeat The cursor buttons have ballistic control they move the cursor further the longer they are held down The cursor wraps around the display RS232 SERIAL CONNECTION 55 2 00016 99000088 200 0 00 68 C INPUT BNC o 5 ACQUIRE ROI TIME ILE PQWER Cte 5 en e 1 90000 et 4 7 DETECTOR AND CURSOR BUTTONS 5 SOFT BUTTONS CONNECTOR Figure 2 Control Locations V POWER ON OFF AND AUTO POWER OFF The power is turned on by pushing the POWER button A on the front panel If you have problems on turn on see the section on Emergency Measures It is turned off by pushing button A u
28. he instrument will stop counting PZ Pole Zero This corrects for the ballistics of the preamp circuit Connect an oscilloscope between TP9 signal and TP5 ground The detector should be connected to the Rainbow Trigger on the positive peaks Adjust PZ R57 until the waveform has no undershoot If no oscilloscope is available turn PZ 20 turns CW or until it clicks then 8 turns CCW ZERO This adjusts the zero of the analog to digital converter Connect an oscilloscope between TP10 signal and TP5 ground The detector should be connected to the Rainbow Trigger on the positive pulses from the detector Adjust Zero R47 until the end of the ramp is at the same voltage as the input to the triangle waveform If no oscilloscope is available turn it 20 turns CCW or until it clicks then 10 turns CW although this is a course adjustment D CELL BATTERIES Y m MAIN BOARD PREAMP HV BOARD OPTIONAL TP10 _ gt wg HV PZ BACK OF PREAMP HV TP6 GROUND Figure 7 Adjustment Locations ADC This adjusts the gain of the Analog to Digital Converter Connect an oscilloscope between TP8 signal and TP5 ground Connect a pulser to either the DB 9 connector on the front panel or to the input directly through a matching network Adjust the pulser heights until the height of the pulses on the oscilloscope are 2 volts Connect the oscilloscope between TP10 signal and TP5 ground
29. ing data If it is set to a number other than zero it will decrease until it reaches zero and will stop the data acquisition The choices are MENU Back to main menu SUBTRACT Changes the MCA from adding counts in each channel to subtracting counts in each channel Shows in Status on top line ADD Changes the MCA from subtracting counts in each channel to adding counts in each channel Shows in Status on top line RESET Resets the time in the top line to 00 00 00 DOWN Decrements the number at the cursor location in the time display located in the top line UP Increments the number at the cursor location in the time display located in the top line CURSOR BUTTONS Change the digit to change in the time display FILE MENU H 2345678 9 18 11 12 MENU PRU OFF SRUE LOAD FILE MENU The FILE MENU saves and retrieves spectrums from 12 different files Each file can store only 1 spectrum Only the spectrum data is stored The display changes to showing the numbers 1 through 12 Each one represents a file spectrum The cursor buttons move the cursor The Choices are MENU Back to main menu PWR OFF Turns off the power LOAD Loads a spectrum from the file that is marked by the cursor The scale is automatically changed to LOG and the cursor moves over to the next file SAVE Saves the current cursor in the file that is marked by the cursor The cursor automatically moves over to the next file MODEL 7000 RAI
30. ntil the MAIN MENU is displayed then pushing the POWER MENU selection E then the PWR OFF button E The data will remain in memory while power is off If the batteries are too low then the Rainbow will show LOW BAT in the display When the batteries are very low the Rainbow will automatically turn itself off and will not turn back on until new batteries are installed The Rainbow will automatically turn itself off in about 1 hour if it is not acquiring a spectrum This prevents it being left on unintentionally and ruining the batteries COUNTS AT CURSOR SCALE DEADTIME BARGRAPH CURSOR CURSOR CHANNEL ROI TIME STATUS EE 0552 00076 00056527 99 00 00 Low BAT GRAPH MENU _ acautre rar TIME FI POWER CN 63 69 69 EX ROI SELECTED LOW BATTERY INDICATOR Figure 3 Display Description MODEL 7000 RAINBOW MCA 6 VI DISPLAY The spectrum is displayed in all menus except the FILE menu The bottom line shows the function of the buttons below the display The top line shows from left to right Channel number of the cursor 0 to 1023 Counts in the cursor channel In compressed this is average of 4 channels Counts in the Region of Interest ROI Except when acquiring data then it shows RUNNING Number of counts full scale vertical Choices are Log 50 100 200 400 800 1K 2K 3K 5K 10K 25K 50K 1M Acquire time in HH MM SS Deadtime corrected
31. of Interest ROI MENU that will set clear channels for ROI count reached from MAIN MENU Total number of counts in all of the channels that are marked with ROI on the bottom line of the graph SAVE FILE MENU Saves the current display into the highlighted file Will overwrite any data in the file Select the highlighted file with the cursor buttons SCALE DN ACQUIRE MENU Decreases the scale factor SCALE UP ACQUIRE MENU Increases the scale factor SCALE SETUP MENU Increases the scale factor Will rollover at the upper end SCALE The number of counts full scale vertical in the graph portion of the display Choices are Log 50 100 200 400 800 1K 2K 3K 5K 10K 25K 50K 1M SERIAL DB9 Connector on the side of the Rainbow for connection to a computer SETUP POWER MENU Changes to SETUP MENU START ACQUIRE MENU Starts acquiring data Time will change Button will change to STOP after being pressed STOP ACQUIRE MENU Stops acquiring data Time will stop Button will change to START after being pressed SUBTRACT TIME MENU Will change from adding counts to subtracting counts in each channel when acquiring data This is normally used to subtract background TIME TIME MENU reached from MAIN MENU Sets the time for acquire and also sets add subtract mode UP TIME MENU Raises the value of the highlighted number by 1 Cursor moves the highlighted number ZERO Zero adjustment See Adjustment Section XV EM
32. rrect The or positive side of the batteries all face in the same direction and go toward the red end on the battery holder PUT BATTERIES INSIDE SLEVE EE lt m BATTERIES WRONG POLARITY WILL DAMAGE INSTRUMENT Figure 6 Battery Replacement MODEL 7000 RAINBOW MCA 15 Xl OPERATIONAL A Deadtime The Rainbow has deadtime correction It measures the time for each pulse and compensates for this lost time by altering the internal timekeeping clock The actual time displayed will not be the same as clock time because of this correction B Button Repeat All of the buttons will repeat The cursor has a ballistic movement It will move further the longer the cursor button is held down It does this in both the expanded and compressed displays The same type of enhanced action is also true when setting the Gain in the SETUP MENU C Pulser Input An external pulser can be used with the internal preamp HV board Connect it between pin 5 signal and 1 ground on the 9 connector marked DETECTOR I O on the side of the Rainbow Internally it has a 50 ohm load Subtracting Counts When the Rainbow is set to subtract counts TIME MENU the counts will stop at zero There are no negative counts E Overflow The counts will stop at 65535 counts per channel They will not overflow or roll over to lower values Error Messages
33. same as Xxx except the transfer rate is slower for slower computers Z Transfer all the files This takes about 1 minute Hor Help Menu A Data Structure The data consists of 1 channel per line with 1 to 5 ASCII digits per channel 0 to 65535 The leading zeros are suppressed There are 1024 channels in the X and V command and 13 312 channels in the Z command The Z command transfers files 0 through 13 consecutively The first line of each file is the file number File number 13 is the current display MODEL 7000 RAINBOW MCA 14 X BATTERIES Wait 1 minute after turning the Rainbow off before replacing the batteries Removing the rear cover immediately can short high voltage and damage the instrument NOTE The main batteries besides powering the Rainbow are also used for powering the data memory for the 12 files The memory will hold for 2 minutes while changing batteries To be safe transfer any important files to a computer before changing the batteries STEP 2 LIFT REAR COVER SLIGHTLY SLIDE FRONT STEP 1 REMOVE 4 SCRESWS MARKED BATTERY ACCESS Figure 5 Removing Rear Cover The batteries are replaced by removing the back cover It is held in place by 4 screws Two of these are on the right hand side of the front panel and two are on the side with the connectors and handle They are all marked BATTERY ACCESS Slip the cover off and the 3 D cells are clearly visible Replace them in the sleeve Make sure the polarity is co
34. trigger on the positive part of the ramp Adjust ADC R53 until the length of the ramp is 75ns HV The high voltage adjustment will change the gain of the detector Normally the Gain in SETUP MENU is set to around 3500 and the high voltage is adjusted until a peak from a check source is located wherever the user wants The Gain is then used to adjust the peak if any further adjustments are necessary MODEL 7000 RAINBOW MCA 17 INTERNAL SETUP 8 CONNECTIONS A Detectors The Rainbow has the capability of accepting detectors in four arrangements The first is with a preamp high voltage board installed inside the Rainbow The second is with an external preamp high voltage module plugged onto the base of a detector and powered by the Rainbow The third is with a NIM bin external high voltage power supply coupled to an external preamp The fourth is a NIM bin external high voltage power supply coupled to an external preamp and amplifier The input of the Rainbow is designed to be flexible for external inputs It has an input attenuator and can accept positive and negative inputs SCINTILLATOR Optional Preamp Hv EXTERNAL Installed in MCA AMP HV amp PREAMP EXTERNAL DETECTOR WITH pREAMP HV INTEGRAL PREAMP amp HV Figure 8 Detector Configurations B Where to Plug in the Detector With the optional preamp HV board installed plug the detector into the BNC connector marked INPUT on the side of the Rainbow All other options
35. ut without the source of radiation present This will remove the extra counts from background It will automatically go back to adding counts when you reset the data D Look at Region of Interest If you want to know the counts in a particular region of interest then switch to the ROI menu To add a channel to the ROI push the ADD button The button will change to ADD This indicates that anywhere you move the cursor those channels will be added to the ROI The channels that are included in the ROI count are indicated by looking at the bottom line of the graph portion of the display but above the bottom line of text If there is a dot or line there then all those channel s are included Remove channels in the same way as you added them but push the REMOVE button The ROI counts are visible only when the Rainbow is not acquiring data E Saving the Data Once you have a spectrum you may wish to save it Switch to the FILE MENU The data can be saved into one of the 12 files that are numbered on the display Select the file with the CURSOR and then push the SAVE button The data will be saved into that file and the cursor will automatically increment to the next file Transferring the Data To transfer the data to your computer see the section on Transferring Data This will transfer the data from the Rainbow to your computer MODEL 7000 RAINBOW MCA 13 IX EXTERNAL COMMUNICATION amp TRANSFERRING DATA The 12 files spectrums can b
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