ALPHA PARTICLE COUNTING SYSTEM CALPH USER MANUAL
Contents
1. E O 29 30 i 5 http www ipses com e mail info ipses com 11 4 scloniific electronics he dE ls Q5 X QOIPSES REVISION HISTORY Manual revision history Em m Date March 2005 October 2009 minor changes June 2011 changes June 2015 6 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY PS ES Tel 39 02 39449519 Fax 39 02 700403170 Gh 997 71 _ eechorecs info ipses com szcientilic electronics POT DESCRIPTION The alpha particle counting system Calph is a stand alone low level alpha counter used for accurate alpha dose measurements It is composed of two principal units a control and power unit and a detector unit The control and power unit consists of e e e The detector unit consists of Integrated High Voltage power supply for Photomultiplier PMT oignal shaping amplifier Two single channel analysers with adjustable LLD values One delayed coincidence unit CPU for system control LCD display 2 lines x 20 characters 42 characters per line impact dot matrix printer eHead on 52 mm Photomultiplier PMT el ight safe enclosure eHigh Voltage lock to prevent damage of the PMT caused by accidental opening eSample holder The two single2. info ipses com scientie electronics 5 l IOS onam BE CAREFUL Do not scratch or damage the Plexiglas window and clean it with a very soft cloth even slight scratches can avoid the acquisition data from the photomultiplier SAMPLE AND SCINTILLATOR DISC REMOVING To remove the sample form the PMT take off the sample holder and open the holder cap as described in the upper section Sample placement Take off the powder turning upside down the holder then place the holder on a level surface Carefully remove the scintillator disc using a small suction cup During this operation make sure the plexiglass window perfectly lays down on the level plane to avoid stresses which could detach the plexiglass form the holder If some ZnS particles are remained on the suction cup clean it with a soft cloth 18 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY PS ES Tel 39 02 39449519 Fax 39 02 700403170 o info ipses com scientific electronics b cu use CX IPSES MEASUREMENT Starting From the rear panel connect the input signal n 13 PMT HV n 11 and the HV Lock n 12 connectors to the control unit trough the correct cables supplied with the system Connect the power cord and then power on the unit Now the system is ready to start a measurement with the factory default parameters to change these values see the setup section Calibration
3. 2 periodic print enabled with a period of 60 minutes periodic print enabled with a period of 90 minutes 4 periodic print enabled with a period of 120 minutes Different command characters are ignored setup values are stored in non volatile memory It is possible to modify the setup values when no measure is in progress apart from the special case of test measure enabled see pag 17 Measure control e G starts the measure e S stops the measure e P pauses the measure e R resumes the measure Data readout The next messages produce an immediate answer from the unit eC requests the total counts and the elapsed live time answer will be three 32 bit words and two 8 bit words separated by commas representing the total counts of SCA 1 and SCA 2 the 23 IPSES S r l Suor Lazzarotto 10 20020 Cesate MI ITALY A4 PS ES Tel 39 02 39449519 Fax 39 02 700403170 A 21 927 7 _ TEM elechonici info ipses com scientie electronics Iv Je P LOS es coincidences and the elapsed live time in hours and minutes If the measure is ended this command shows the final values of the last measure U requests the status of the unit The status request message U forces the device to return a byte 2 hex characters representing the actual status of the unit system status 0 system ready measure in progress Bit1 measure paused Bit2 measure starting delay for
4. 20020 Cesate MI ITALY AM Tel 39 02 39449519 Fax 39 02 700403170 5 5 electronics http www ipses com e mail info ipses com scloniific electronics he 5 Q5 X ists GUARANTEE IPSES warrants to the end user in accordance with the following provisions that its branded hardware products purchased by the end user from IPSES company or an authorized IPSES distributor will be free from defects in materials workmanship and design affecting normal use for a period of one year as of the original purchase date Products for which proper claims are made will at IPSES s option be repaired or replaced at IPSES s expense Exclusions This Guarantee does not apply to defects resulting from improper or inadequate installation use or maintenance actions or modifications by unauthorized third parties or the end user accidental or wilful damage or normal wear and tear Making a claim Claims must be made by contacting IPSES office within the guarantee period Please contact IPSES S r l Via Suor Lazzarotto 10 20020 Cesate Ml Italy Tel 39 02 39449519 39 02 320629547 Fax 39 02 700403170 http www ipses com e mail support ipses com Limitation and Statutory Rights IPSES makes no other warranty guarantee or like statement other than as explicitly stated above and this Guarantee is given in place of all other guarantees whatsoever to the fullest extent permitted by law In
5. Enter Key in the setup mode 4 Pause Key Resume key in the setup mode 5 Start Key Left arrow key in the setup mode 6 Stop Key Right arrow key in the setup mode 7 Print key ona NM http www ipses com e mail info ipses com 1 EI j N CALPH USER MANUAL gt PSES scientific electronics he p Oe 10 9 8 CALPH S N 200501 IPSES Test Output SCA1 Output SCA2 Output DANGER HIGH VOLTAGE CAUTION r HIGH VOLTAGE INSIDE 9 REMOVE POWER CORD BEFORE tli OPENING 230 Vac 50 Hz pO NOT COVER 13 Power entry plug with two 14 2 5A fuses 12 14 8 BNC output connector for SCA2 single channel analyzer 2 9 BNC output connector for SCA1 single channel analyzer 1 10 BNC test output connector 11 HV BNC output connector for PMT 12 Circular connector for HV interlock 13 BNC input connector for the photomultiplier signal 14 Serial port PC connection 10 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY pm f PS ES Tel 39 02 39449519 Fax 39 02 700403170 MOA IT http www ipses com e mail info ipses com 49 4 5 ESI scientific electronics BIOS ess OPERATION Power on and shut down To turn on the unit use the rightmost switch on the front panel see n 1 on the drawing After the logo presentation the unit is ready to start the meas
6. IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY SIPS ES Tel 39 02 3944951 a Fax ed 02 700403170 7 chentiic elects nfo ips s scientie electronics lv Je pP LOS ess Test measure When the start key is pressed a wait message appears on the display for few moments If during this time the pause key will be pushed the test measure function is selected While working in this operation mode only the total counts will be displayed The test measure function allows the possibility of changing dynamically both the SCA 1 and SCA 2 energy threshold and the High Voltage of the photomultiplier Once entered in this operation mode press the setup key to enter in the setup menu see the correspondent section to select new values When the setup menu will be closed the measure can restart If the HV was changed the correspondent status LED will blink for a few seconds just the time of stabilizing it To end the measure press the stop key If during the measure the sample holder is accidentally opened a security switch inside the housing will interrupt the high voltage and the measure stops immediately 20 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY IP Tel 39 02 39449519 Fax 39 02 700403170 M y 2 P S ES 997 71 _ info ipses com oO Print measure report Measure 27 Measure started 86 fier 1999 18 83 Heasure Li
7. Report form 29 IPSES S r l Suor Lazzarotto 10 20020 Cesate MI ITALY pran PS ES Tel 439 02 39449519 Fax 439 02 700403170 gt 11 4 elechtonici info ipses com scientific electronics I IQ ls Os gt IPSES ENGINEERING PROBLEM REPORT Problem describer Name IPSES s r l Via Suor Lazzarotto 10 Company Cesate MI Italy Fax 439 02 700403170 Product Name Version Serial No Report Type bug change request or technical problem Major bug Urgency Minor bug High Change request Medium Technical problem Low Problem Description Reproduction of Problem IPSES s r l Action notes 30 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate ITALY PS ES Tel 39 02 39449519 Fax 39 02 700403170 a 7 1 S i 49 1 5 j ESI info ipses com scientie electronics he 9S cius XE IPSES Product code ALFA01 9501 Rel 01 02 0001 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY Tel 439 02 39449519 39 02 320629547 Fax 39 02 700403170 e mail info ipses com support Q ipses com 31 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY 24 Tel 39 02 39449519 Fax 39 02 700403170 uu P S ES electronics rod EUM info ipses com
8. To calibrate the alpha counter use a known activity sample Place a ZnS scintillator disc inside the sample holder then put the sample on the disc Close the holder cap select the correct measure parameters then push the start key to begin the measurement If the sample holder is properly closed the high voltage will be on and the HV status led on the front panel will light The measure status LED will blink for a few seconds until the high voltage will be stabilized then LED light will be on and the measure properly starts On the display the total counts of the two Single Channel Analyzers SCA 1 and SCA 2 and the coincidences counts are shown Pushing the enter key once or two times it is possible to see on the display the actual counting rate or the elapsed live time By connecting a scope to the BNC test output connector see n 10 on the rear panel drawing orto SCA1 and SCA2 outputs n 8 and 9 the correct working of the instrument can be checked Measure Select the measure parameters as described in the OPERATION section p 11 Place a ZnS scintillator disc inside the sample holder then put the sample to be measured on the disc Close the holder cap To start the measurement press the start key If the detector unit is properly closed the HV is on and its status LED lights The measure status LED will blink for a few seconds until the high voltage will be stabilized then LED light will be on and the measure properly starts On the d
9. To modify the value act on the adjust knob then press the enter key To quit the setup without saving the new values press the resume key If the periodic print is enabled it is possible to choose four different periods 30 60 90 120 minutes to have a periodic print report during measure 13 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY V Tel 39 02 39449519 Fax 39 02 700403170 Q 2 P S ES 01 i 4 uem info ipses com scloniific electronics w xit ls cu rusas CES IPSES In this case at the start of the measure the selected parameter are printed Then when the selected period is passed the elapsed live time and the incremental counts from the start or from the last periodic print are printed so it is possible to check if during that time some spikes or noise were present When the system is paused or resumed by the print key present on the front panel see key n 7 on the drawing it is possible to select a different time for periodic report without entering in the setup menu pressing once the key a periodic time is printed Every time the key is pressed the periodic time is incremented and printed If the periodic print is not enabled pressing the print key on the front panel n 7 it is possible to have a report of the current measure according the values of the selected parameters the total counts the counting rate in cpm counts per minutes e
10. signal acquisition stage a sensitive photomultiplier and a high voltage power supply for the photomultiplier capable of acquiring the thermoluminescence signal from the sample at different temperatures e device capable of keeping an inert gas inside the vacuum oven e dryer and an ultrasonic bath to prepare the samples e software to control analysis system Hivo HiVo is a device especially conceived to furnish an adjustable elevated voltage up to 1 995V Although it is mainly used to supply photomultipliers HiVo can be employed with any device needing high voltage and low current supply HiVo can be customized to serve our clients needs to the best for this on request HiVo is available with any supply voltage and positive and or negative output voltage HiVo is equipped with a 3 5 digit LCD display showing the output voltage A 10 turn potentiometer sets the voltage and assures precision and stability For further information please visit our website http www ipses com 27 IPSES S r l Suor Lazzarotto 10 20020 Cesate MI ITALY PS ES Tel 39 02 39449519 Fax 39 02 700403170 2 01 i PEN uem Hechorics info ipses com scientie electronics 2 OS 2 oss CONTACTS IPSES S r l conceives projects and markets electronic and scientific instruments The customized planning of our devices allows us to answer specific necessities for customers asking for embedded systems I
11. HV stabilize after resume command Bit3 measure resuming delay for HV stabilize after resume command Bit4 system error If the error bit is high i e if it answers with a code like 10 then another error code is added after a comma for example 10 02 Error condition 0 no error Bit0 sample holder cap open with HV on Bit1 syntax error in the host message 24 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY pran Tel 39 02 39449519 Fax 39 02 700403170 Q 2 P S ES http www ipses com e mail aee cd info ipses com 1 5 j N cientilic electronics 5 Ft i OS EDIPSES MAINTENANCE Detector unit The only parts of the system which need some maintenance are the sample holder and the PMT plexiglass window Clean them periodically with a soft cloth When they are opaque replace them with the spare ones supplied with the system The new sample holder window must by glued with a drop of cynolit or epoxy To change the PMT window the whole detector must be dismounted It does not need to be glued TECHNICAL FEATURES Power supply 230 Vac 1090 50Hz request it is available with any supply voltage Max Consumption 50 VA Operating temperature 0 50 C Operating humidity 1020 8090 High Voltage output adjustable between 320V and 1 995V Output current 2 maximum Dimensions control unit 470 8 mm x 191 6 mm x 312 6 mm h x x p PMT hous
12. PSES clients enjoy access to a dedicated project engineering team available as needed Our pool consists of highly competent professionals whose experience in this field is extremely strong Thanks to constant updating and technical development IPSES is a leading company combining the dynamism of a young group into the competence and reliability of a qualified staff IPSES S r l gases c k x 1 a pie ees Tt eg A er a hte LN Research and development office on a Via Suor Lazzarotto 10 X P s S 2 20020 Cesate MI 2 Italy m tt i d a le tel 39 02 39449519 39 02 320629547 fax 39 02 700403170 e mail http www ipses com 28 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY os ET PS ES Tel 39 02 39449519 Fax 39 02 700403170 LA WLA EG QC nERC elechonici info ipses com scientie electronics iv BIOS ess SUPPORT INFORMATION The customer is at liberty to contact the relevant engineer at IPSES S r l directly Telephone 39 02 39449519 39 02 320629547 Fax 39 02 700403170 Email support ipses com PROBLEM REPORT The next page is a standard template used for reporting system problems It can be copied and send as a fax Alternative bugs may be reported by emails in this case please insure that the mail contains similar information listed in the Engineering Problem
13. T Sample holder Housing gt Holder cap Plexiglass window To place the sample inside the Photomultiplier PMT take off the sample holder the upper part of the PMT from the housing as shown in the picture below Fig 1 Fig 2 and Fig 3 g 16 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY Tel 39 02 39449519 Fax 39 02 700403170 pu ec http www ipses com e mail info ipses com 49 4 5 j ESI Kk j SJ E 5 USER MANUAL gt PSES Put the sample holder of the PMT on a level plane so that its plexiglass window lays down perfectly then unscrew the two screws on the top and open the holder cap fig 3 Place carefully a scintillator disc inside the sample holder with its ZnS surface toward the top fig 4 Make sure the disc perfectly lays down on the plexiglass window then put the powdered sample on the scintillator spreading the powder evenly Fig 5 Close and screw the holder cap then replace the sample holder on the housing Fig 4 Fig 5 Each ZnS scintillator disc allows to analyse only one sample after the measurement the disc will be contaminated by the powder and for this it can be re used only for repeating the analysis on the same sample 17 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY Tel 39 02 39449519 Fax 39 02 700403170 47
14. WWW ipses com i gt IPSES scientific electronics ALPHA PARTICLE COUNTING SYSTEM CALPH USER MANUAL Rel 01 02 0001 Hardware code ALFA01 9501 CONCEIVING PLANNING DEVELOPMENT IN SCIENTIFIC ELECTRONICS CALPH USER MANUAL d15 scientie electronics Information provided in this manual is property of IPSES S r l and must be considered and treated as confidential This publication can only be reproduced transmitted transcribed or translated into any human or computer language with the written consent of IPSES S r l Information in this documentation has been carefully checked and is believed to be accurate as of the date of publication however no responsibility is assumed of inaccuracies IPSES will not be liable for any consequential or incidental damages arising from reliance on the accuracy of this documentation Information contained in this manual is subject to change without notice and does not represent a commitment on the part of IPSES The design of this instrument is subject to continue development and improvement Consequently the equipment associated to this document may incorporate minor changes in detail from the information hereafter provided All brand or product names are trademarks or registered trademarks of their respective holders This manual in English is the original version Printed in Italy Copyright 2009 2015IPSES S r l All rights reserved 2 IPSES S r l Via Suor Lazzarotto 10
15. channel analyzer and the time coincidences unit which act on the SCA allow to discriminate decays of Th232 chain rejecting fast coincidence pairs due to U238 chain Measure items also supplied with the system Zno scintillator discs on mylar IPSES S r l Suor Lazzarotto 10 20020 Cesate ITALY pm PS ES Tel 39 02 39449519 Fax 39 02 700403170 11 10 mm elechonici info ipses com GENERAL FEATURES The alpha particle counting system Calph offers LCD display two lines 20 characters backlighted 2K internal RAM with battery and timekeeper printer for measure report or periodic prints remote RS232 serial interface monitor test outputs High Voltage status led Measure status led Adjust knob to select the value of the parameters Measure time corrected for dead time Power down recovery L K ELOS ummm Q1 IPSES scientie electronics 200 501 IPSES S r l Suor Lazzarotto 10 20020 Cesate ITALY Tel 39 02 39449519 Fax 39 02 700403170 info ipses com elechonics scientie electronics BIOS ess FRONT PANEL Measure status LED high voltage status LED LCD display CALIPH ALPHA CDUNTER LEES on OOOO Start lt be Pause e Power Printer 6 5 4 3 1 Power on off 7 1 2 Adjust knob 3 Setup Key
16. e the used cartridge pushing its left side as showed by the arrow and the word push in the drawing above then insert the new cartridge in its seating until you feel it snaps into position It will help to turn the knurled button on the right side of the cartridge clockwise to tension the ribbon before printing Paper roll and ink cartridge refill Kind of paper normal in rolls Width 57 5 mm 0 5 mm Thickness 0 060 0 085 mm Maximum outside roll diameter 50 mm minimum 12 5 mm Ink ribbon cartridge cartridge ERC 09 or ERC 22 Colour available purple or black Life ERC 09 250 000 characters ERC 22 1 000 000 characters All refills both paper rolls and ink cartridges can be supplied directly by IPSES Autotest To print out the self test push together the FEED button n 16 and print button n 15 while you power on Calph unit The printer will print the character sequence with the information on the default parameters If the FEED button is released before the end of the self test the self test will be execute just once then the printer is ready to receive data If the button is held down the self test will be repeated 15 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY it gt IPSES S dca Tel 39 02 39449519 Fax 39 02 700403170 49 1 5 elechon info ipses com http www ipses com e mail cientilic electronics 5 OS e QOIPSES SAMPLE PLACEMEN
17. idence coincidence counter incremented false coincidence coincidence counter unchanged 22 IPSES S r l Suor Lazzarotto 10 20020 Cesate MI ITALY PS ES Tel 39 02 39449519 Fax 39 02 700403170 L 21 997 71 _ mcm elechonici info ipses com scloniific electronics he l Q5 X QOIPSES COMMUNICATION PROTOCOL The messages exchanged over the serial communication interface are ASCII text strings The commands are case sensitive The parameters n h m s have to be written as decimal numbers The message terminator is the character CR Hex 08 other control characters are ignored The data format is 1 start bit 8 data bit 1 stop bit no flow control The following is the complete list of the communication messages Setup commands e SCA 1 energy threshold n is a 16 bit word and the measure unit is mV e E2 n SCA2 energy threshold n is a 16 bit word and the measure unit is mV e V n High Voltage for PMT n is a 16 bit word and the measure unit is V e W n time window coincidences n is a 16 bit word and the measure unit is ms e D n delay for coincidences n is a 8 bit word and the measure unit is ms e T h m s measure time expressed in hours minutes and seconds h m s are three 8 bit words of two characters e pn periodic print n is a 8 bit word and it means periodic print disabled 1 periodic print enabled with a period of 30 minutes
18. ing 220 mm height base 140 mm x 140 mm Tel 39 02 39449519 Fax 39 02 700403170 1 4 j Uus 25 IPSES S r l Suor Lazzarotto 10 20020 Cesate MI ITALY Q IPSES elechonici info ipses com scientie electronics Iv BIOS eus Printer print method impact shuttle dot matrix Print direction horizontal Print speed 1 0 lines second Paper feed 2 3 lines second Print quality full graphic bit image Characters per line 42 normal Print area width 47 mm Horizontal resolution 5 26 dots mm Vertical resolution 2 7 dots mm 0 37 mm dot line Dots per line 252 26 Pees se va S aanas GIPSES icerige electronics http www ipses com e mail info ipses com WOLA N he Os cnn OTHER LABORATORY DEVICES IPSES operates in the lab instrumentation sector designing customized electronic solutions not only by producing and delivering scientific instrumentation but also through efficient and qualified support courses and lectures on the basics on principles and methods and guiding our customers in choosing the right instrument and learning how to use it most efficiently thermoluminescence laboratory IPSES designs produces and markets all the instrumentation required for a thermoluminescence lab e vacuum oven to heat the sample e thermoregulation unit with enough precision to control the heating ramp e photo detector made up by
19. isplay the total counts of SCA 1 and SCA 2 and the coincidences counts are shown see p 19 the time coincidence window paragraph for details Pushing the enter key once or two times it is possible to see on the display the actual counting rate expressed in cpm or the elapsed live time To stop the measure use the stop key in this case measure status LED is switched off and the HV is shut down as show also by its status LED If enabled at this time a measure report is printed see the correspondent section During a measurement it is possible to stop temporarily the process using pausing key this condition will be indicated by the blinking of the measure status LED The HV will be shut down as indicated by its status LED At this time is possible to stop the measure pressing the stop key or to resume the measure using the resume key When the measure time ends the HV will be shut down both LEDs on the front panel will be switched off the measure report will be printed if required see the printer section p 12 and the count rates will be displayed Then the system wil be ready to start with a new measurement At the end of a measure pressing the pause key will clear the display If during the measure the sample holder is accidentally opened a security switch inside the housing will interrupt the high voltage pausing the system After closing the sample holder cap push the resume key to restart the measure or use the stop key to stop it
20. les provided by the law during the installation and the use of this device For any information which is not contained in this guide please contact IPSES S r l Suor Lazzarotto 10 20020 Cesate Ml Italy Tel 39 02 39449519 39 02 320629547 Fax 39 02 700403170 http www ipses com e mail support ipses com 4 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY AX Tel 39 02 39449519 Fax 39 02 700403170 Gi PS ES http www ipses com e mail info ipses com 11 4 scientie electronics t o d m X IPSES TABLE OF CONTENTS gis ne een ee ee re ee ee re 6 re 7 Ear e 8 T 9 gen dg M 10 HC 11 zl pz cU 13 AMPLE BORN 16 EE CABEDUE 18 SAMPLE ANO ORT REMO VIN 18 IVE FSSA 19 Mm 22 CONMONICA TION PROTOOL um 23 cmt E 25 ler ois a seme ta HODIE ES EDU D XEM 25 ABORA TOR 27 Se isl MN MR 28 esito n DUIS DIE 29
21. nd the standard deviation also in cpm When the measure time is finished a final report is always printed which includes the measure parameters the total counts the counting rate and the standard deviation in cpm If the measure is stopped through the stop key n 6 the measure report is printed only if the stop key is released within a second During testing measure no final report is printed only if the periodic print is enabled it is possible to have a start report If no measure is in progress the print key allows to print the report of the last measure executed CAUTION The printer is already configured for working with the alpha counter Do not change the default parameters so do not press both buttons n 15 and 16 when the printer is switched on 14 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY A TM PS ES Tel 39 02 39449519 Fax 39 02 700403170 tA 1 http www ipses com e mail 4 scientie electronics Wed T I o j 5 O 5 CALPH USER MANUAL gt PSES Paper roll and ink ribbon cartridge replacement To change the paper roll open the printer and insert the new roll as show in the drawing above To facilitate the insertion of the new roll it will help to cut the leading edge of the paper at an angle Push the line feed button on the printer unit n 16 until the paper is correctly positioned To change the ink ribbon cartridge first remov
22. personal remarks Measure data measure started and ended measure live time set parameters Final counts SCA1 SCA2 coincidence counts on the first column there are the total counts on the second one there is the count rate counts per minute the last column there is the standard deviation counts per minute IPSES S r l Via Suor Lazzarotto 10 20020 Cesate ITALY Tel 39 02 39449519 Fax 39 02 700403170 http www ipses com e mail A gt IPSES electronics info ipses com cientilic electronics he S Q5 X QOIPSES COINCIDENCE COUNTER Besides the two independent SCA units calph features a smart time coincidence unit The digital output of SCA1 is the input of this unit Every time an event is counted by SCAT it triggers a time window defined by t1 and t2 the delays from the trigger time 10 for the start and the stop of the time window respectively If a second event is counted by SCA1 with a delay falling in the predefined time window the coincidence counter is incremented see figure below The two delays t1 and t2 are adjusted using the time coincidence window setup as described at page 11 and 12 This functionality allows differentiating between the alpha activities of two different radioisotopic chains A typical application is to evaluate the ratio of Th232 and U238 alpha activity in a sample Time window E to event LS good coinc
23. ssible through the correspondent outputs on the rear panel to check if the selected energy threshold is correct in connection with the input signal This parameter is available only when the periodic print is enabled IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY SIPS ES Tel 39 02 39449519 Fax ed 02 700403170 lt T 1 elech nfo ips s d f CALPH USER MANUAL gt 4 E SES Factory default parameters e Energy threshold for SCA 1 1200 mV e Energy threshold for SCA 2 1500 mV e Time window anticoincidence 20 ms e Time window coincidence 300 ms e PMT high voltage power supply 1000 V e Measure time 24 00 00 e Periodic print enabled NO e Periodic print period 120 minutes BE CAREFUL The photomultiplier supplied inside the detection unit supports a maximum voltage of 1500V Do not exceed this voltage with the PMT high voltage power supply otherwise the photomultiplier will damage irreparably Internal clock setup To check time and date of the internal clock power on the unit while pressing the setup key n 3 First the time will be presented select the field to modify using the arrow keys and set up the correct value acting on the adjust knob To save the new time values press the enter key n 3 now the date setup menu will be shown To close the setup menu without saving the values press the resume key n 4 To change the date once the date set
24. the absence of applicable legislation this Guarantee will be the end user s sole and exclusive remedy against IPSES General Provisions IPSES makes no express warranties or conditions beyond those stated in this warranty statement IPSES disclaims all other warranties and conditions express or implied including without limitation implied warranties and conditions of merchantability and fitness for a particular purpose IPSES s responsibility for malfunctions and defects in hardware is limited to repair and replacement as set forth in this warranty statement IPSES does not accept liability beyond the remedies set forth in this warranty statement or liability for incidental or consequential damages including without limitation any liability for products not being available for use or for lost data or software With the exclusion of shipping costs for and from IPSES s development office 3 IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY 4 sid PS ES Tel 39 02 39449519 Fax 39 02 700403170 927 7 _ TEM scenic electonict info ipses com scientie electronics Iv BIOS ess WARNING ELECTRICAL DEVICES COULD DAMAGE EQUIPMENT OR PROPERTY OR CAUSE PERSONAL INJURY This guide contains instructions and technical features of the ALPHA PARTICLE COUNTING SYSTEM CALPH Read with attention before attempting to install It is the responsibility of the technician to undertake all the safety ru
25. up menu is presented select the field to modify using the arrow keys and set up the correct value acting on the adjust knob Press the enter key to save the new values or the resume key to quit without saving the changes Power down recovery The internal RAM equipped with a battery allows to resume a measure interrupted because of an accidental power interruption No manual operation is required To reset the measure condition power on the unit while pressing the stop key n 6 this operation sets the parameters to the default values too IPSES S r l Via Suor Lazzarotto 10 20020 Cesate MI ITALY gt IPSES Tel 39 02 39449519 Fax ed 02 700403170 da elec nfo ips s scientie electronics iv PIOS ess Interfacing The alpha counting system Calph is equipped with a serial interface RS232 Using the 9pin sub D connector on the rear panel it is possible connecting the unit to a Personal Computer PRINTER Calph is equipped with an integrated 42 characters per line impact dot matrix printer The printer has a speed of 1 0 lines sec The print method is impact shuttle Print setup Two print functions are available from the setup menu e Periodic print enabled YES NO e Periodic print period 30 60 90 120 minutes Default parameters are e Periodic print enabled NO e Periodic print period 120 minutes Select the chosen parameters through the arrow keys
26. ure with the setup parameters previously selected Setup Four double functions keys are present on the front panel see n 3 to n 6 on the drawing To modify the measure parameters press the setup key n 3 To select the desire parameters press the arrow keys n 5 and n 6 The current value of each parameter is shown To change this value act on the adjust knob n 2 a clockwise rotation will increase it while counter clockwise rotation will decrease it To accept the selected value push either the enter key n 3 or the arrow keys Pushing the enter key closes the setup menu whereas acting on the arrow keys shows the next or the previous setup parameter The resume key n 4 closes the setup menu without saving the values Pressing the setup key will show every time the last edited parameter The selected parameters are always saved in the internal RAM To set the parameters to default values power on the unit while pressing the stop key n 6 Modifiable parameters e Energy threshold for single channel analyzer 1 20 up to 4500 mV e Energy threshold for single channel analyzer 2 20 up to 4500 mV e Time window anticoincidence 2 up to 20 ms e Time window coincidence 100 up to 400 ms e PMT high voltage powe supply 320 up to 1950 V Measure X hours 0 up to 48 Minutes 0 up to 59 seconds 0 up to 59 e Periodic print enabled YES NO Periodic print period 30 60 90 120 minutes It is po
27. ve Tine 47 29 99 Threshold SCRI Pat Hish Voltase 1888 Coincidence Vindos 28 388 ms 98 aV SCA 288 Incremental counts Time gt 88 82 88 83 88 94 08 85 88 85 88 87 88 88 88 89 08 18 08 11 08 12 88 13 88 STAI 1 286 83 1 1693 1 093 1 1583 1 8983 1 19403 1 193 1 1733 11693 1 115483 1 08 03 1 13583 1 1693 SCA 1 02293 9 9892 9 9502 9 33482 9 42482 1 5 93 9 43 482 9 91 92 9 9 6 92 9 6292 9 90E382 9 7992 1 MEASURE REPORT Measure 27 1 19 82 1 12482 1 8332 1 2EHZ 1 15692 1 33492 1 1292 1 170382 1 23902 1 135482 1 0692 1 286482 1 2942 Measure started 86 Apr 1999 18 83 Measure ended 07 Aer 1999 87 28 Measure Live Time 13 25 Threshold 50 mY 5082 298 aV Pat Hish Voltase 1888 V Coincidence lindos 28 388 ms TAL 1 33M TA 1 31294 Coinci 1 547683 1 3048 4 806 2 Measure ended by user 01 1 9988381 1 6256481 Total counts Count rate Std dev cra 1 336 81 1 423 81 CALPH USER MANUAL gt PS ES scientie electronics Measure data Measure number date and hour measure live time set parameters Incremental counts periodic print report during measure Available periods 30 60 90 120 minutes It indicates the counts during the selected period at the moment of the print SCA1 SCA2 and coincidence counts Measure Report space for
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