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Ionization Chamber Controller User Manual

1. 3X FIBER OPTIC RX ST Seas ADDRESS SELECTOR 3X FIBER OPTIC TX ST rt ETHERNET VN N POWER IN LEMO REDEL PXG M4 GROUND LUG 2 O Los a RESET SWITCH STATUS LEDs GATE IN LEMO GATE bud MONITOR OUT RELAY OUT INTERLOCK ENABLE ENABLED Figure 2 1128 front and rear panels Dimensions mm 1128 User Manual 1128 UM 141014 Page 21 of 121 PSI System Controls and Diagnostics Th p 43 6 42 6 Li TL qu LUES i i ra E El d E 193 E El e H E E in dis Es gt E 482 6 E a B 9 O H e I H BH E e gt Y by L3 L3 U y 221 0 35 248 8 3 0 Figure 3 1128 case plan and side views Dimensions mm 1128 User Manual 1128 UM 141014 Page 22 of 121 PSI System Controls and Diagnostics 9 Installation 9 1 Mounting The 1128 is intended for 19 rack mounting but may be mounted in any orientation or may be simply placed on a level surface A fixed mounting to a secure frame is recommended in a permanent installation for best low current performance as this can be degraded by movement and vibration The length of signal cables from the sensor to the I128 sh
2. PSI System Controls and Diagnostics 26 Communications Interfaces The 1128 is a member of the PSI G2 range of devices The unit is provided with four hardware interfaces RS 232 RS 485 two fiber optic receiver transmitter ports and Ethernet The RS 232 and RS 485 interfaces are intended for simple direct connection to PCs with no other equipment necessary The fiber optic interfaces are provided on the 1128 to allow it to act as a loop controller and thus control multiple slave devices and allows multiple devices to be connected to a host computer via the I128 in a looped topology The fiber optic interface is well suited to large systems and experiments The Ethernet interface is provided to allow direct connection to systems which are integrated using standard local area network hardware and protocols The 1128 can support multiple clients and in particular you can be connected via Ethernet and the serial port at the same time If the serial connector is attached then the serial port becomes active irrespective of any other connections The baud rate type of protocol and choice of RS 232 or RS 485 levels is made using the mode switch If the Ethernet connection is made then the Ethernet port becomes active The mode switch and address switch have no function when using Ethernet communications LEDs incorporated in the RJ 45 jack indicate activity on the port 26 1 Ethernet The Ethernet port is a standard RJ 45 jack
3. 115 31 1 COOLING FAN MAINTENANCE eec oeck iere eee eo EU Ie eee E DRE ta 115 31 2 CALIBRATION uester i A UR Ne ee eire exa e all ieee es RERO E 116 32 RETURNS PROCEDURLE ectecte eoe erosut ero boe ra o Qastechiconcceasesseccedsesescadsscescescescesabesteedessinensasbsetenseceueds 117 33 SUPPORT EA 118 R MEBVDRIueTYmE 119 35 DECLARATION OF CONFORMITY eene eee een eee eno sesto tnos eee en oeste ene sese e en ee eee enses sete sees e eee esee eee eena 120 36 REVISI N HISTORY iiie eoceee eee etica o toon eee er ada veu oec ee ev oe saseda sdra Too Cun opa oeuvre pao eue ao asese eassa e ea tasa tS 121 1128 User Manual 1128 UM 141014 Page 5 of 121 PSI System Controls and Diagnostics 2 Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26 Figure 27 Figure 28 Figure 29 Figure 30 Figure 31 Figure 32 Figure 33 Figure 34 Figure 35 Figure 36 Figure 37 Figure 38 Figure 39 Figure 40 Figure 41 Figure 42 Figure 43 Figure 44 Figure 45 Figure 46 Figure 47 Figure 48 Figure 49 Figure 50 Figure 51 Serial adaptor erp E 12 1128 front and rear panels Dimen
4. Inaccurate readings Bad calibration Compare latest calibration factors with previous ones Re calibrate cables should not be connected during 1128 User Manual 1128 UM 141014 Page 111 of 121 PSI System Controls and Diagnostics Re calibrate cables should not be connected during calibration calibration Unit not collecting data Inappropriate trigger mode waiting for external trigger when none present Select internal trigger mode Use appropriate trigger mode Missing data in csv log Data rate exceeds communication rate Use buffered acquisition Use buffered acquisition when appropriate No monitor pulse output Incorrect configuration of charge per pulse value Check setting Use appropriate setting No signal at HCC input monitor pulses are derived from HCC signal Check connections Connect relevant signal to HCC Unit is not measuring Check 1128 state Ensure 1128 is initiated and triggered when necessary Unit is configured for wrong type of monitor pulse Check purchase specification Return unit to Pyramid Technical Consultants Inc for modification if necessary No or incorrect response to external gate Incorrect gate polarity selected Check settings Use correct polarity Incorrect trigger mode setting Check settings Use a suitable trigger mode Source of
5. PSI System Controls and Diagnostics 18 Interlocks and Direct Control Lines The I128 includes a suite of interlock features to enable it to form part of a dosimetry system where irradiation must stop if there is a failure or out of tolerance condition It also provides two fiber optic digital level outputs intended for process control A front panel keyswitch allows the I128 to operate in two interlock modes one intended for normal use the other intended for engineering or diagnostic use in which some computed interlocks may be ignored A CAUTION A safety system must be subject to a full and documented risk analysis specific to the application and the regulatory environment The 1128 in isolation is not intended to implement a safety system However it may form part of such a system for the particular activity of tracking delivered dose subject to risk analysis and approval by the appropriate bodies 18 1 Process control outputs Both the fast fiber optic outputs can be programmed in the 1128 to perform any function The nominal use is as follows The Process Status fiber optic output is a general purpose direct signal to any remote system of the computed status of some dose map execution stage The Enable Beam fiber optic output is intended to gate a remote beam delivery device so that the I128 can control the amount of dose delivered to some location 18 2 Interlocks The 1128 provides four isolated relay contacts an
6. Technical Consultants Inc PTC Diagnostic v5 5 0 Address Name Owner 192 168 100 20 1281 Looking for Loop Controllers 50 0 0 0 0 Add IP Address Y Load System File x Connect amp Discover Subdevices Figure 16 Discover devices in progress Since you have the simplest possible network it should find only the I128 you are working with In some circumstances the discovered devices may include Pyramid tools such as the A60 recovery utility You can ignore these When you click on the discovered 1128 entry in the list to highlight it the Connect and Discover Subdevices button is enabled Double click on this to establish the connection to the I128 Pramp Technical Consultants Inc SAKA PTC Diagnostic v5 5 0 l thes A60 Recovery 6 Discover Controllers 0 0 0 0 Add IP Address H Load System File Co Figure 17 Ready to connect to the 1128 A window for the I128 will open and you will see messages in the message area as the I128 adds your PC as a host Unless you have devices connected on the fiber optic loops you will see errors at startup where the I128 has failed to find any slave devices You can ignore these errors 1128 User Manual 1128 UM 141014 Page 41 of 121 PSI System Controls and Diagnostics 4 819216803 i281 loop 1 loop 2 a de 5e 10 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80
7. 69 Contiguous data number of samples as a function of input data Fate mmoommommm s 72 Signal and trigger used for custom trigger examples eere esee esee esent tentant s ees en etn snae 73 Time varying signal seen in internal mode eerie eee eese entente eene setn sena tn sensns enses ss es sensus 74 Time varying signal seen in custom buffered mode eere eee esee eene en tatnen etn snue 74 Using trigger signals and burst size to capture a portion of the signal ceeeeeeeeeeeene 75 Examples of monitor output pulse TTL left transformer coupled right 77 1128 actuator control CirCUit cscssesscscsscsccesceseesssssessscsssscescescessessnssscsesssessescescessssssssssssessessossoseoes 78 Actuator connections for 24 VDC solenoid 4 eere eee eee essent esten eene tn sensns tns tn senses sesenta sun 79 Interlock relays in series on multiple devices wired for current loop top or 24 V logic bottom 81 Enabled Status interface R roccccnorncnnoso 81 Interlock Interface sicscccctcccssssccceccessccsessdiscecessdicssssdcsescessdccenssaidcecusodicsssedidaackssiseccsscecocassddadesnesicecssedsessashaes 82 Relay idyciu m a 82 1128 User Manual 1128 UM 141014 Page 6 of 121 PSI System Controls and Diagnostics Figure 52 Fig
8. Pyramid Technical Consultants Inc All rights reserved A Figure 59 Interrogating the 1128 via a web browser 26 3 RS 232 connection A basic three wire RS 232 connection is all that is required to communicate with the 1128 The 1128 uses a 6 pin mini DIN connector An adaptor to a 9 pin female DSub is available from Pyramid a standard pin to pin male to female 9 pin DSub cable can them be used to connect to the PC The cable length should not exceed about 5m especially at the maximum baud rate For longer serial cable runs you should use RS 485 6 pin mini DIN male 9 pin D female TX RX 55 o 63 d20 o o o of Figure 60 RS 232 cable 1128 to PC 1128 User Manual 1128 UM 141014 Page 101 of 121 PSI System Controls and Diagnostics 26 4 RS 485 connection example RS 485 is used to extend a serial connection over a long distance If you have a RS 232 serial port on the host PC then an RS 232 to RS 485 converter is used at the host PC end The built in RS 485 of the I128 allows a direct connection at its end A commonly used converter is the MOXA TC100 The Moxa TCC 80 is a low cost alternative for less critical applications The converter should be configured for four wire full duplex RS 485 operation The I128 provides parallel termination for transmit and receive It is therefore optional whether you also terminate at the TC100 end but there is no harm if you do The
9. Measuring Trigger HCC Range 20uA hd Combine Channels Dosimetry Target Charge 0 000100 C M eoo Beam Enable MO Target Reached Monitor Charge 0 000000 C Beam Detect Level 0 000000 U 1 D 15 Figure 24 Setup HCC sub tab The range drop down allows you to select from the four available current ranges 1 5 10 20 uA Checking the Combine Channels box causes the two input pins on the channel 0 connector to be joined therefore doing a summation of two incoming currents The target charge and dose remaining are functions which allow you to exercise precise dose delivery provided you can enable and disable the source of current The sequence is to set the target charge in measured coulombs then set the Beam Enable check box which sends a signal from the I128 Beam Enable fiber optic output Dose is then accumulated until the target value is reached at which point the enable signal is turned off The Monitor Charge parameter sets the quantum of measured charge which results in a pulse being sent from the I128 Monitor connector The Beam Detect Level parameter and U D counts allow testing of a beam present absent detection which would generally form part of a therapy safety system They will be fully supported in a future software release 1128 User Manual 1128 UM 141014 Page 49 of 121 PSI System Controls and Diagnostics 11 4 5 Calibration You can direct the internal 50
10. or before zero correction Offset drift lt 0 01 relative to full scale in use over one hour after stabilisation and with environmental temperature maintained to 1128 User Manual 1128 UM 141014 Page 16 of 121 PSI System Controls and Diagnostics 2 C Ranges Four 20 uA 10 uA 5 uA 1 uA Calibration current 2 5000 0 0005 nA temperature coefficient lt 5 ppm C 1 External accuracy Better than 0 05 of full scale in use Digitization 16 bit 250 kSa s Downsampling Block averaging to match the electrometer inputs averaging time Integral plane input gated integrator mode Number One software selectable alternative to I V converter Input impedance 3 kohm Dynamic current range lt I pA to 100 uA Dynamic charge range lt 0 1 pC to 210 nC Input offset current 6 pA 4 or before zero correction Offset drift 0 5 pA over one hour after stabilisation and with environmental temperature maintained to 2 C measured with 10 pF feedback and 100 msec integration Noise charge lt 0 01 pC rms typical at 100 usec integration no summation 0 02 pC rms typical at 1000 usec integration no summation Integration time range 55 usec to 1 msec Feedback capacitors 100 pF and 3400 pF Calibration current 500 00 0 1 nA temperature coefficient lt 5 ppm
11. 1128 Ionization Chamber Controller User Manual Pyramid Technical Consultants Inc 1050 Waltham Street Suite 200 Lexington MA 02421 USA US TEL 781 402 1700 FAX 781 402 1750 EMAIL SUPPORTOPTCUSA COM Europe TEL 44 1273 492001 PSI System Controls and Diagnostics 1 Contents 1 CONTENTS T FE 2 2 EIGURES ietesecees se eee teh o ONE NER e SEHE PER ERES URN NQRE E INR RE e baec ER EE PAS SU PRENNE S SERE RUIN NO DM UR EE SHE TE Re LUE 6 3 SAFETY INFORMATION eoo Seen eos eee eaae soss aee ooa o uda sav o eaae e akase S esee epo S Gao arrancan e Ces Vp ee era ou EN Ta 8 4 NAAA 10 5 SCOPE OF SUPPLY d neo ice cia danes 11 6 OPTIONAL ITEMS AND RELATED PRODUCTS oooocccccononcconnnonconanaccconnnccconancccononaccconrncccconnccccoooccconoccoons 12 6 1 JONIZATION CHAMBERS econ iaa scada 12 6 27 POWER SUPPLIES ut A me tenti ER tt 12 6 3 SIGNAL CABLES AND CABLE ACCESSORIES cccccccccccncncnononononononononononononononononononononononononononononononononononononininininese 12 CA DATACADBEES Gontenescnsseveneeme eene E Dd 12 6 5 TRIGGER DISTRIBUTION cccccccccccncnnnnnoncnnnnnnnnnnnnonononononononnnnononononononononononnnnnononononononononononononononononononononeneneninenese 13 7 INTENDED USE AND KEY FEATURES eene eee eene eese eno eese eene ette enses seen esee eene e seen esee eene e seen eese e sn
12. 1128 User Manual 1128 UM 141014 Page 110 of 121 PSI System Controls and Diagnostics No signal when expected or very small signal No return path for current Check cabling Try a direct ground connection from the I128 to the sensor body or external high voltage supply ground if you are using one Ensure you understand and implement the complete circuit for the measured current HV bias not being applied to ionization chamber Check setting and loopback voltage Apply appropriate bias voltage Small signal is lost in noise Use longer integration and more conversions per sample to improve signal to noise No signal when expected on HCC Using higher current range when signal is small Check range setting Use an appropriate range for the expected signals Connected to wrong pins on connector High offset currents Poor quality signal cables Check with cables disconnected Use good quality low noise cables if attempting to measure small signals Bad calibration Re calibrate cables should not be connected during calibration Re calibrate cables should not be connected during calibration Inadvertent selection of zero subtraction on the DiagnosticG2 software Check setting Do not select zero subtraction if valid signals are present Internal contamination of 1128 Return unit to Pyramid Technical Consultants Inc for servicing
13. Trigger HCC Peak V Buffer Contiguous Data 2 56 07 Mode Custom Initiate Command anc Rising Edge V Burst Size 50 n BNC g Edge gt 15 07 Stop Count 10000 BNC Current A 1e 07 1 99 1 991 1 992 1 993 1 994 Time seconds v sow G weave y Ezeo 3 Sti 7 scope Ac Histoaram 7 10000 Samples dk nt A 1 99 1 991 D Time seconds v 10 e Noava v Ezeo CS A scope X Hstogram 7 10000 Samples d i Figure 44 Using trigger signals and burst size to capture a portion of the signal 15 3 2 Pre defined trigger modes The 1128 provides a number of pre defined trigger modes primarily for backwards compatibility with other devices that support them They can all be achieved by appropriate Custom trigger settings In the following table NBuf is the buffer size and NBst is the burst size For every trigger mode you can force the 1128 to the stopped state at any time by sending the Abort command Mode Start Pause Stop Notes Internal Internal n a n a Acquisition will start immediately you send Initiate and continue indefinitely if unbuffered or to the lesser of NBuf size and NBst if buffered Custom Full user control over start pause resume and stop 1128 User Manual 1128 UM 141014 Page 75 of 121 PSI System Controls and Diagnostics External Start BNC n a n a Acquisition will start when a valid trigger ed
14. 1128 User Manual 1128 UM 141014 Page 28 of 121 PSI System Controls and Diagnostics 1128 lon Multiway screened Zivack chamber signal cable mei pt gt gt f Coaxial L4 HV cable Q AA Y KGnd External V pond Y Case bias HV 7717 PEELA Figure 7 Current return path ionization chamber bias provided separate HV module 1128 User Manual 1128 UM 141014 Page 29 of 121 PSI System Controls and Diagnostics 10 How the I128 Works and How to Use it An Overview The 1128 is a very powerful instrument which provides many facilities for reading out and controlling position sensing ionization chambers and related devices In this section we shall take a general overview of these capabilities 10 1 Multichannel electrometer input channels 1 to 128 The heart of the 128 channel electrometer section is an ADAS integrated CT electrometer chip and custom FPGA interface Each input channel has an integrating amplifier which accumulates the incoming current as charge on a small capacitor for a defined integration period from 60 usec up to 1 msec The maximum current per channel that can be measured irrespective of integration time is 500 to 600 nA This can be increased as a purchase option by the addition of current division on the inputs The I128 is not designed to measure negative currents on the multichannel inputs but has some n
15. Another use could be control and monitoring of beam scanning electromagnets using remote M10 M40 and H10 devices Figure 11 shows a possible configuration illustrating these two applications but there is an almost unlimited range of possibilities 1128 User Manual 1128 UM 141014 Page 34 of 121 PSI System Controls and Diagnostics mo 1 Hall probe X Y scan magnet H10 Hall probe lonization 1128 chamber M10 S LAN can magnet J power supply M10 M40 Accelerator control Figure 11 Schematic example 1128 control of remote devices One of the fiber optic loop ports can be allocated to synchronization messages rather than control of remote devices One intelligent real time controller in a system which may be an 1128 or another device acts as the master for map execution and sends messages to other devices to ensure that they all execute the same map point at the same time The 1128 provides a further two fiber optic transmitters available for functions such as fast beam gating control process status indication using a DC level or frequency optical version of the monitor pulse output and so on 10 11 Monitor unit output Radiation therapy applications use the concept of a monitor unit which is an aliquot of dose delivered by the system It is generally rel
16. Gaussian Fit Device 228 1 09216803 licens 00h Connected Busy Measuring Error Data Analysis Histogram Peak Peaks 4 V Center of Gravity Position p 79 9009 9 Noise Threshold 45 o 2 b Gaussian Fit Std Dev c 1 89734 Window 5 V Gaussian Fit gaussabola Peak Min 0 00 Int Min 0 00 Threshold 9g Y Gaussian Fit regression Noise Threshold 596 H Window 4 5 2 Weighting 26 Display Full Statistics Current A 5e 08 14 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124 120 e Channel 19408 Samples d Ee Ionization Chamber gt zero 43 Strip X Scope JV Histogram Setup Calibration 50 aJ No Avg Interlocks State Idle Last Error a E Properties Figure 20 Data analysis display 1128 and PTC DiagnosticG2 calculations The Center of Gravity calculation simply computes the center of gravity and standard deviation of the strip signals out to the points either side of the highest channel where the signal drops below noise threshold of the peak channel signal This calculation makes no assumption about the shape of the peak but is somewhat prone to noise The other two calculations assume that the peak has a Gaussian shape and do a fit The fitted curve is shown on the histogram graphic In both cases the algorithm exploits th
17. It also controls the multichannel ADC thus taking the data from channel 0 and the multichannel DAC 1128 User Manual 1128 UM 141014 Page 63 of 121 PSI System Controls and Diagnostics 12 2 9 Power supplies 24 VDC input power enters via a 1 1 A resettable fuse and is used directly to power the cooling fan and any device connected to the relevant pins of the actuator connector The 24 V input is protected against polarity reversal by a series diode and from transients by series inductors and transorbs to chassis which limit excursions to 6 V not shown on the block schematic DC DC converters and linear regulators generate the voltage rails required by the 1128 24V Power input fan actuator user supply and general I O user supply 200 mA fuse interlock user supply 200 mA fuse 15 V High voltage module Fused at 200 mA 12 V I V converter gated integrator other analog amplifiers filter and buffers ADC analog input MUX 5 VD Interlock relay coils actuator relay coil general I O user supply low power TTL digital inputs and outputs monitor pulse output calibration current select logic 5VA Calibration current sources calibration current select switches 3 3 V A60 ADAS board CPLDs ADC DAC serial transceiver 2 5 V A60 CPLDs status LEDs switch and jumper read calibration current select logic general logic 1 8V CPLDs 1 2 V A60 1128 User Manual 1128 UM 141
18. The I128 supports auto MDIX so you do not need to worry about whether your cable is a patch cable or a crossover The I128 will negotiate connection speed with the device it is connected to and the highest speed that both ends can support will be used Communication uses standard TCP IP and UDP messaging See section 27 for further information on using the I128 in a network 26 2 Web server You can connect to the I128 using a standard browser program by typing in its IP address The device responds with a screen showing connection details firmware versions and a list of any connected devices on the fiber optic ports If you add new looped devices they can be connected from this screen and you can interrogate them by clicking their entries in the list 1128 User Manual 1128 UM 141014 Page 100 of 121 PSI System Controls and Diagnostics f DE au rem y 2 Pyramid Technical Consu x Y p o HQ gt QC 19216803 A a zB NewTab Hm BBC News Home PTCUSA ea Google Maps MA Barclays Personal Ba Documents All Do Halifax Online Ban zu 1128 Electrometer YRAMID 128 1 A Technical Consultants Inc Connected Devices DE Discover Device Properties mize Name i128 1 loop 1 IP Mode o M10 3 IP Address 192 168 0 3 loop 2 Netmask OS Firmware 0 3 6 5 Realtime Application 0 2 11 10 FPGA 0 1 1 29 Secondary FPGA 0 1 3 19 Hardware Revision 0
19. recommended Dip switch setting for the TC100 is Swl Sw2 Sw3 OFF ON ON The recommended Dip switch setting for the TCC 80 is Swl Sw2 Sw3 ON ON a Tx B 1 Tx gt ox lt __l D Tx A 2 Rx H Rx B 3 Gnd DRM nu Rx A 4 n c LEO 5 TX EO 6 Rx LEO 1O 1Hh sGnd 1128 TC100 Figure 61 RS 485 cable 1128 to TC100 In order to enable the RS 485 interface on the I128 you must have a physical connection to the serial port and you must select one of the relevant modes modes 6 through 9 If you have trouble getting the RS 485 connection to work check carefully to ensure that you have all the transmit and receive lines connected as shown 26 5 Fiber optics Two fiber optic ports are provided for connecting slave devices such as M10 and M40 general purpose I O devices H10 Hall probes and others Up to 15 devices can be connected in a loop on each port although the available bandwidth must be shared between them Messaging uses the Pyramid Technical Consultants 10 Mbps deterministic 8 bit serial protocol It is particularly suited to real time systems where the slave devices must work in synchronization with the I128 1128 User Manual 1128 UM 141014 Page 102 of 121 PSI System Controls and Diagnostics The fiber optic ports can be used for peer to peer communication between I128s or between I128s and loop
20. typically actuator in and Actuator out are read by the A60 1128 User Manual 1128 UM 141014 Page 62 of 121 PSI System Controls and Diagnostics The TTL gate input presents a 2 5 kohm impedance to ground The gate output is able to drive a 50 ohm load at TTL levels The monitor pulse output can be configured at time of manufacture as TTL into a 50 ohm load or as a transformer coupled fast negative pulse Two of the outputs are set by the A60 and two by the secondary FPGA The A60 also controls the relay used for actuator control 12 2 5 High voltage High voltage is generated by an EMCO or Ultravolt module of the required rating The output is filtered by a 3 kHz RC filter with 33 2 kohm series resistance The filter is before the sampling voltage divider so any voltage drop due to current drawn from the supply is visible in the readback The worst case drop with a one watt 2 kV supply is 16 6 V at full current The current draw is typically negligible when the load is an ionization chamber The voltage divider presents a 20 Mohm load to the supply thus it will draw 0 1 mA from a 2 kV supply at full voltage HF filtering series chokes are fitted in the outgoing and incoming high voltage lines to suppress transients due to external arcing 12 2 6 Interlocks A pair of redundant CPLD complex programmable logic device monitor the health of the A60 processor via a watchdog function and read the state of the Enable i
21. 12 40 KGnd 11 Ch 10 In 09 26 Ch 11 In 10 4 KGnd 12 Ch 08 In 07 27 Ch09 In 08 42 KGnd 13 Ch 06 In 05 28 Ch07 In 06 43 Shield 14 Ch 04 In 03 29 Ch05 In 04 44 Ch 03 In 02 15 Ch 02 In 01 30 Ch 01 In 00 1128 User Manual 1128 UM 141014 Page 92 of 121 PSI System Controls and Diagnostics Channels 33 64 Ep inputs 32 to 63 1 Ch61 In 60 16 Ch63 In 62 3 Ch 64 In 63 2 Ch60 In 59 17 Ch 62 In 61 32 Shield 3 Ch58 In 57 18 Ch59 In 58 33 KGnd 4 Ch56 In 55 19 Ch57 In 56 34 KGnd 5 Ch54 In 53 20 Ch55 In 54 35 KGnd 6 Ch52 In51 21 Ch53 In 52 36 KGnd 7 Ch50 In 49 22 Ch51 In 50 37 KGnd 8 Ch48 In 47 23 Ch 49 In 48 38 KGnd 9 Ch 46 In 45 24 Ch 47 In 46 39 KGnd 10 Ch 44 In 43 25 Ch45 In 44 40 KGnd 11 Ch42 In 41 26 Ch 43 In 42 41 KGnd 12 Ch 40 In 39 27 Ch41 In 40 42 KGnd 13 Ch38 In 37 28 Ch 39 In 38 43 Shield 14 Ch 36 In 35 29 Ch 37 In 36 44 Ch35 In 34 15 Ch34 In 33 30 Ch33 In 32 Channels 65 96 IIl inputs 64 to 95 1 Ch93 In 92 16 Ch 95 In 94 31 Ch96 In 95 2 Ch92 In91 17 Ch94 In 93 32 Shield 3 Ch 90 In 89 18 Ch 91 In 90 33 KGnd 4 Ch88 In 87 19 Ch 89 In 88 34 KGnd 5 Ch86 In 85 20 Ch 87 In 86 35 KGnd 6 Ch 84 In 83 21 Ch
22. 121 PSI System Controls and Diagnostics One multi range current to voltage converter channel channel 0 By software selection this can be operated as an I V converter or as a gated integrator according to need Channel 0 can be switched under software control to take signal from one of two connector pins with the other grounded A build time option allows channel 0 to be switched under software control to take signal from one of two connector pins or from both connector pins combined Optional high voltage output for detector biasing with remote loopback for verification General purpose parallel input output port with analog and digital lines available for ionization chamber monitoring or other purposes Pneumatic actuator control port Interlock inputs and outputs including one safety rated relay Key switch to select therapy or experimental modes in medical applications Gate input and output for triggering on external events and trigger distribution Monitor output for dosimetry monitor unit MU pulse output Ethernet interface with TCP IP and UDP messaging Alternative RS 232 RS 485 and fast fiber optic serial interfaces built in Selectable baud rates Slave devices can be connected to the I128 via the fiber optic interface 1128 User Manual 1128 UM 141014 Page 15 of 121 PSI System Controls and Diagnostics 8 Specification Electrometer inputs Number One hundred and twenty eight in
23. 39 Configuring the IP address on the host computer eese eese eee eee ee eene en eene tn atn senses enses etn sn san 39 Ping test of the Ethernet connection eee eee eee reete eene en tenens testas ens tn senses eese tn seasons tns tos esses sensn au 40 Discover devices in progress eee esee ee eene eene tn tne siso sico con non sens enses sess tn ereis ron non sesta etn caos 41 Ready to connect to tlie TI28 eee eene rp eio nae Pro peed setanto sto beoe bna ee ero pea cesse a rose esp eo Pe SEE ee fe apes TS 41 Opening the 1128 window eerie eee teen entente tatnen tenens tn stas tn sens tas esent essen etos tasso senses eene ea suus 42 HCC graphic displayed 4 ceci eee eee eese eese eese testen sensa etas tens tensa sess ts etas etas tens ea senes eae staat 44 Data analysis display 1128 and PTC DiagnosticG2 calculations eeeeeeeeee ceret 45 Tonization chamber tab eerie eret esee eee etse tata sste kov ti toso vosos senses sese ss sensns tosta senses esses etn snus 46 Setup Measuring sub tab eeeeee e eee ee eres eese ense tn setas testata setas etas ts seas tas etas e ease tns eas eas sees ta aeo 47 Setup Trigger sub tab P M 48 Nia HCC Su ta m C 49 Calibration source control eres esee esee esee enean tae tn stas
24. 5 VDC out 9 DGnd 22 Digital out 3 10 Digital out 4 23 DGnd 11 Digital in 4 24 Digital in 3 12 Digital in 2 25 Digital in 1 13 DGnd 24 V out fused 200 mA combined load on this connector and actuator connector Allocation of signals when this connector is used for IC128 25 ion chamber environmental monitors Analog in 1 Temperature Pressure Humidity Reference Digital out 2 1 Multiplex control for signals delivered to analog in 1 00 Temperature 01 Pressure 10 Humidity 11 Reference Digital in 2 1 Ionization chamber board revision 5VDC out Power to IC sensors Chassis Ionization chamber chassis 1128 User Manual 1128 UM 141014 Page 90 of 121 PSI System Controls and Diagnostics An adaptor cable or board is required to convert from D25 at the I128 to D9 at the ionization chamber 24 1 2 Actuator One Dsub 9 pin female Pin 1 f TAS Pin 6 External view on connector solder side of mating plug 1 Actuator relay pole A 6 Actuator relay pole B 2 24 V return 7 Opto input B anode 3 n c 8 24 V return 4 24 VDC out 9 424 VDC out 5 Opto input A anode Opto isolator cathodes have internal connection to 24 V return 24 V out fused 200 mA combined load on both pins plus I O connector 24 1 3 HCC High current input channel 0 One four pin Lemo OB female Suitable mating connectors Lemo FGG 0B 304 CLCD52Z cri
25. 8 49 1 06431 2 so 1 06827 7 s4 1 05997 11 s52 106113 4 53 1 0624 12 s4 1 06654 8 ss 1 059 se 1 06022 sz 1 06549 3 s 1 06223 5 s 105988 2 eo 1 06523 13 61 1 06042 7 52 106003 9 pA m T Current HCC Analog Hv Channel All 128 fl y Clear Al Calibrations He NEN Gain Offset 1 0 606103 19 2859 SpA Gain Offset 4 3 04121 7 1438 10 pA Gain Offset 1 3 04867 5 6265 20 uA Gain Offset 1 3 05338 6 6229 Figure 26 Current input calibrations The calibrations for the general purpose analog inputs and outputs and the high voltage set point and readback are factory set Take a record of the values before making any changes Calibration for the gated integrator mode of the HCC will be added in a future software release 11 4 6 Interlocks This tab allows you to monitor and test 1128 interlock signals and run test sequences This is useful during initial commissioning of a safety system and should be used in collaboration with Pyramid engineers 1128 User Manual 1128 UM 141014 Page 51 of 121 PSI System Controls and Diagnostics Interlocks Fault Q Enable In Q Enabled Command CPLD A Error O CPLD B Error Q Keyswitch Q Normal Mode Normal Interlock Status Q Interlock Command O Interlock Uninitialized C Relay Command Q Initial
26. 8 88 92 96 10 104 10 112 116 1 Channel auto Noava Ezeo 3 Sire 7X Scope A Histogram State Ide Measuring Last Error Fiber message timeout Figure 18 Opening the 1128 window The graphic will be a vertically autoscaled histogram display of background noise in the 128 channels The 1128 user interface screen is divided into two halves plus a top banner area 11 3 Screen layout Top banner The top banner contains the following indicators Comms bar When moving this indicates that messages from the I128 are being received by the PTCDiagnosticG2 The message frequency is displayed Connected LED When lit this indicates that communications are valid and the system is not in error Busy LED When lit this indicates the 1128 is busy and cannot respond to inputs for example while performing a calibration Measuring LED When lit green this indicates that data acquisition is occurring When lit yellow this indicates that an acquisition is initiated but that the I128 is waiting for a trigger Error LED When lit the I128 has logged a communication error The details are displayed in the message area Auto Initiate Checking this box causes the software to automatically initiate a new acquisition whenever you change any acquisition parameter 1128 User Manual 1128 UM 141014 Page 42 of 121 PSI System Controls and Diagnostics Initiate This button starts data acquisitio
27. C 1 External accuracy Better than 0 1 of full scale in use Digitization 16 bit conversion rate linked to integration period Environmental monitor general purpose I O port Number One Inputs Three differential analog inputs 10 VDC for temperature pressure and humidity sensing or other purposes Four TTL digital inputs for general use Outputs Two analog outputs 10 VDC for general use Four TTL digital outputs for remote MUX control or other purposes A 9 t uator control Number One 1128 User Manual 1128 UM 141014 Page 17 of 121 PSI System Controls and Diagnostics Outputs Potential free relay contact pair 24 VDC output and return Inputs Two opto isolator inputs for limit switch readback High voltage outputs Number One Output power 1 watt Voltage options 20 to 200 V Line 0 0156 Load 0 0596 Ripple 0 0196 50 to 500 V Line 0 0196 Load 0 0146 Ripple 0 01946 100 to 1250 V Line 0 00146 Load 0 00546 Ripple 0 00196 200 to 2000 V Line 0 0196 Load 0 0196 Ripple 0 001 96 HV monitoring Independent loopback HV input Monitor unit output Number One Levels TTL levels into minimum impedance of 50 ohm or Transformer coupled 42 5 V into 50 ohm build time option Pulse width 50 nsec TTL Charge increment User defined charge measured on integral plane input will r
28. Optional Items and related products 6 1 lonization chambers IC128 25 Low scattering ionization chamber for high energy positive ion beams with 25 by 25 cm sensitive area 128 readout strips in each axis and integral readout plane 1C64 16 21 Low scattering ionization chamber for high energy positive ion beams with 16 by 16 cm sensitive area 64 readout strips in each axis and two integral readout planes 6 2 Power supplies PSU24 40 1R 24 VDC 40W PSU universal voltage input plug receptacle for standard IEC C14 three pin socket with output lead terminated in two pin Redel PAG connector CAB LR 3 REDEL Cable Switchcraft LR 2 1 mm jack to Redel PAG connector PD 8 Eight output 24 VDC power supply unit 19 rack mounting 6 3 Signal cables and cable accessories CAB D44M xxLN D44F Cable multiway low noise DSub 44 pin male to DSub 44 way female xx feet long CAB L304M xxLN L304M Cable multiway low noise Lemo OB 4 pin to Lemo OB 4 pin xx feet long CAB SHV xx SHV Cable coaxial HV SHV to SHV xx feet long 6 4 Data cables ADAP D9F MINIDIN RS 232 6 pin DIN male to 9 pin D sub female adaptor Figure 1 Serial adaptor cable CAB ST xxP ST Fiber optic cable 1 mm plastic fiber ST terminated with color coded sleeves xx feet long 1128 User Manual 1128 UM 141014 Page 12 of 121 PSI System Controls and Diagnostics CAB ST xxHCS ST Fiber optic cable pair 200 um silica fiber ST terminated with color coded sleeves xx
29. PREDA ERR eee SR SRE SANO race Re goa ee ZA CONNECTORS c 24 1 FRONT PANEL CONNECTORS sess e ertet eot ehe tee e at it eene vet ey e e dee eh re ER 24 1 1 T O port environmental monitors eese esee eene eene nennen nnn rare cnn naar cra tentent tenere nnne 24 1 2 Feu A a aaa 24 1 3 HCC High current input channel O ocio tete eere tg dee tertie 24 1 1 Signal inputs strip Anputs eue em PE Re e ie m D e im eripe envies 24 1 2 High voltage output and input diae e eai dte di tesi dee sobelasaseeasacbsoeesess 24 2 REAR PANEL CONNECTORS erected erp e a oneri Toa edes e ea ee eene eee eee e EE e EE Ee een o E ERE 24 2 1 Ethernet COMMUNICALIONS cccccccccccccceecscceececesessseeeeeeeeesesnseeeeseeseesssaeeeeceeseusssseeeceeseeensasseeeeeeeesesnsaeeees 24 2 2 RS 232 RS 465 COMMUNICATIONS cccccceccccccccceeessceeeceeessusssseeesceesssuseeeeeeessesnsseeeeeeceseeessaeeeeeseeeeeaes 24 2 3 Gate input and OUtpWt iui iu eee iste et nb ida 24 2 4 Monitor pL iiie te ti e Vea ad oun edes ek oan cave ee eee veg eee aae E euge VE ER tee eves eR ERES eS 24 2 1 Fiber optic communications eee eee eee eese eene eene nennen nenne a nnne nne Roa ese a E A enne nennt 24 2 2 Enable Stat s port s ee et d p p ope Rete e bath ben tibi 24 2 3 InterloCk portu ia A HE Ne qiiem qe AIR ee diee tied eieten 24 2 4 Relay port x ed e uana eap te meer inten ade e a ed
30. To mate with standard SHV connector Core high voltage 2 kV max Outer screen shield at chassis GND 24 2 Rear panel connectors 24 2 1 Ethernet communications RJ 45 jack To mate with standard RJ 45 plug Auto MDIX facility cable can be direct or crossover type 24 2 2 RS 232 RS 485 communications Six pin mini DIN socket PS 2 mouse keyboard type 1128 User Manual 1128 UM 141014 Page 94 of 121 PSI System Controls and Diagnostics Pin6 Pins XX Ping Pin 2 Pin 1 External view on connector solder side of mating plug 1 RS 232 Tx RS 485 Tx 4 n c 2 RS 232 Rx RS 485 Rx 5 RS 485 Tx 3 Gnd 6 RS 485 Rx The socket incorporates a sensor switch that allows the 1128 to detect that a plug has been connected When a connection is made the RS 232 RS 485 transceiver is active and the communication mode is set by the mode switch 24 2 3 Gate input and output Two Lemo coax 00 jack female Input termination 2 5 kohm Output is able to drive 50 ohm load 24 2 4 Monitor input One Lemo coax 00 jack female Output can be configured at time of manufacture to be a TTL level pulse 1 usec at logic high able to drive a 50 ohm load or a 50 nsec transformer coupled negative going pulse 24 2 1 Fiber optic communications Six HFBR ST bayonets suitable for 1 mm plastic or 200 um silica fiber 664 nm visible red light Dark casing receiver
31. _ Target Reached Q On the Setup tab you can enter a target dose to be measured on channel 0 and set the beam enable bit on which lights the corresponding rear panel fiber optic transmitter The 1128 will count down until the target dose is reached at which point it turns off the beam enable Analog input readbacks and output settings DAC and digital output and input bits refer to pins on the front panel I O connector which you can use for environmental monitor readout or other purposes Dig Out In Analog Data V DAC V gt 4 0 000 300 A o o5 The analog setpoints and read values are refreshed when the I128 is acquiring data The high voltage readbacks are a continuously refreshed display of the measured high voltage being sent out by the I128 and the loop back value The over and under indications flag when the measured voltage is outside a user specified range High Voltage HV Ext HV Over Under BR 1128 User Manual 1128 UM 141014 Page 44 of 121 PSI System Controls and Diagnostics 11 4 2 Data analysis The PTC DiagnosticG2 can perform position peak analysis on the incoming data on the 128 electrometer channels by three methods with results displayed on this tab The positions and standard deviations one sigma widths are given in units of strips These calculations are distinct from the similar calculations performed on each measurement by the 1128 itself which are also displayed labeled
32. a short pulse of signal then you may decide to try to time resolve the pulse by using a burst of contiguous readings that cover the pulse duration You can then integrate in time in off line data post processing to get the total charge Alternatively you may not care about the time structure but just want to know the total charge in the pulse In that case you could choose an integration and conversions per sample combination that contains the whole pulse The amount of data you need to handle is thereby reduced This is not an insignificant consideration When you are using the gate input to deliver an external trigger it is beneficial to use the smallest practical integration time There can be an uncertainty in the alignment of the data acquisitions to the trigger edge of up to nearly one integration period Thus it would be better in this case to use ten conversions per sample at 100 usec integration giving an unpredictable delay of up to 100 usec between the trigger edge and the start of the first integration than one conversion per sample at 1 msec integration giving an unpredictable delay of up to 1 msec 14 4 General purpose analog inputs The general purpose inputs whether used to measure ionization chamber environment or other purposes generally do not require to measure at the high rates used for the current signal inputs You can set the averaging period for these inputs independently An averaging period of 1 line frequency is a good
33. and provide 50 ohm termination at the I128 Alternatively you can convert the signal to optical then convert back to TTL near the I128 This allows very long signal runs with excellent noise immunity The Pyramid Technical Consultants X22 bidirectional converter provides the necessary signal conversions 50 ohm source 50 ohm coax TTL source Figure 57 Alternative methods for long distance trigger delivery 50 ohm line top fiber optic bottom 1128 1128 1128 Fiber optic X22 Coax Using the gate output you can daisy chain a local group of I128s with short Lemo to Lemo coaxial cables The latency between the gate input and output is about 25 nsec which is negligible compared to even the shortest 1128 integration period Figure 58 Gate passthrough latency gate in yellow gate out blue 1128 User Manual 1128 UM 141014 Page 89 of 121 PSI System Controls and Diagnostics 24 Connectors 24 1 Front panel connectors 24 1 1 I O port environmental monitors One 25 pin DSub female Pin 13 Pin 1 E P Pin 25 Pin 14 External view on connector solder side of mating plug 1 24 V return 14 24 VDC out 2 Chassis 15 AGnd 3 Analog in 1 16 Analog in 1 4 Digital out 1 17 Digital out 2 5 Analog in 2 18 Analog in 2 6 Analog in 3 19 Analog out 1 7 Analogin3 20 Analog out 2 8 AGnd 21
34. channels are functional and that there is no gross systematic error in the calibration The Pyramid Triangle Generator test board plugs into one 44 pin connector and creates a triangle distribution of currents across the bank of 32 channels on that connector Function generator input Figure 54 Triangle generator test board Genuine Advantage Pyramid test boards are identifiable by a small irregularity on the last two channels A voltage source is required which can either be a 5V power supply connected to the power in connector or the signal from a function generator injected at the BNC connector If you use a function generator you can give any desired time profile to the signal If you connect a 5 V source and set the first switch down you should see a steady triangular pattern with peak about 500 nA If you remove the 5 V source and instead put a 1 V signal into the BNC connector you should see the triangle pattern but with peak about 345 nA 1128 User Manual 1128 UM 141014 Page 87 of 121 PSI System Controls and Diagnostics i128 1 192 168 0 3 Comms OR Connected Busy Measuring Error Data Units Al Channels Banks Peak Channel Data A Sofa ac sf z t E 5 o Beam Enabled Target Reached Q Analog High Voltage HV 1 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124 128 Channel 100 gt G hoava Ee zer
35. controllers such as the A560 This permits activities such as map execution to be coordinated across multiple devices One of the fiber optic ports may also be used to allow the 1128 to be a client on a fiber optic loop This feature is not supported in the current firmware 1128 User Manual 1128 UM 141014 Page 103 of 121 PSI System Controls and Diagnostics 27 Using the 1128 on a network 27 1 Network configurations The I128 uses TCP IP and UDP communication over standard local area network hardware Addressing is using the IP4 standard and it supports static and dynamic DHCP address assignment The device can be configured via the PTC DiagnosticG2 via the serial interface or by your own host software using the appropriate procedure calls Most control and data acquisition systems are set up with fixed addresses assigned by the network administrator It is also typical to isolate such networks from the internet to prevent unauthorized access and to allow operation without firewalls which can disrupt communications In order for the host computer and the I128 to communicate they must be within the same subnet It is typical to limit a local network to 256 addresses by setting the IP4 subnet mask to 255 255 255 0 Then the 1128 and the host must have the first three bytes of their addresses common and must differ in the last byte For example the host could be 192 168 100 11 and the I128 at 192 168 100 20 The last byte mu
36. ese due eee a i e e t aide 75 15 3 3 Trigger response TIME zd eoe Ue E A E O E T 76 16 MONITOR PULSE OUTPUT 4 iieeticceesse esseseestesbe t en seen tasa vu aeo Uode esu be uasa ein o boobie reas eden cana eoru oes Se eran Rad 77 17 ACTUATOR CONTRO Liaiiacticsaceiccieteceletlissckesacccedescennasstadscensseennsdecdcasaceossecusscdacetenseuedsaseecseavccsesseseatesesnteenaes 78 1128 User Manual 1128 UM 141014 Page 3 of 121 PSI System Controls and Diagnostics 18 INTERLOCKS AND DIRECT CONTROL LINES eee e eee ee ee eene een eet tn setae etae e etae etta esten seen ee tna ee 18 1 PROCESS CONTROL OUTPUTS 5 deese pese ede Eta e e RE cis 18 2 hypudise Mr Mem 18 2 1 Enable Status o te niii noie tb Rs 18 2 2 InterloCkR a edad e e au EO PR MS AM I duse dte 18 2 3 RELAY i 19 CONNECTING SLAVE DEVICES witsssissscssatssncecsscesesnaseontscnacssesnssecdsssadsoseaceensonsesisedeseadesteadededessasdenteceosesensay 20 CALIBRATION rr O 20 1 CURRENT CALIBRATION 3 6er haces es tee Sauna UR UE ESO Wer HEREIN e e th ei IU ER ET 20 2 OTHER CALIBRATIONS 45 ones exes ee e ta cous a tada sas ei 21 PEAK OH MU Coon 22 USING THE TRIANGLE GENERATOR TEST BOARD e eee eese neenon esteso stans sten o stesse tense tss eto 23 GATE CONNECTIONS eec ceeesecense equ eE ae tn eae e r stouo esee ERN Eua Ron FAR Ne Re Rana eese e Pn DRE
37. gain of an ionization chamber only the Integral plane and Strips sum fields in this tab are affected they will showed measured current gain or measured charge gain 11 4 4 Setup The Setup tab is where you set up acquisition parameters control high voltage supplies establish trigger settings and control dosimetry When you have found a useful set of parameters you can save the configuration to on board non volatile memory Ex Save Configuration The values will be restored when the I128 next starts up with the proviso that the HV will not be enabled 11 4 4 1 Measuring sub tab Setup Measuring Trigger HCC Data Rate Conv Sample 1 Range Sample Rate High Voltage Integration Time 1000 ps y o v MEUM Max 2000 V High Limit 800 V gt Low Limit 200 V Analogs Averaging Period 1 667e 01 ws Figure 22 Setup Measuring sub tab 1128 User Manual 1128 UM 141014 Page 47 of 121 PSI System Controls and Diagnostics The Measuring sub tab is where you select integration time to be used by the ADAS electrometer chip The drop down control provides times from 55 usec to 1000 usec The same time is used for the HCC If the HCC is working in I V converter mode then it determines the number of ADC readings that are averaged per charge reading If the HCC is operating in gated integrator mode the time used is the selected integration time minus the times defined to reset
38. of 121 PSI System Controls and Diagnostics 4 Models I128 Ionization chamber controller with 128 electrometer channels and one multi range I V converter gated integrator channel XP20 10 5 Add positive 0 to 2000V 1000 V 500 V HV output XN20 10 5 Add negative 0 to 2000V 1000 V 500 V HV output Mxx Increase maximum input current for electrometer channels 1 128 to xx uA options 2 uA 5 uA 10 uA 20 uA default is 550 nA MPN Monitor unit output pulses transformer coupled negative going default is TTL levels DSUM Configure integral dose plane input switching as A or A B default is A or B Example 1128 XP10 MOS 1128 User Manual 1128 with 1000V positive high voltage output and 5 JA maximum current on electrometer inputs 1128 UM 141014 Page 10 of 121 PSI System Controls and Diagnostics 5 Scope of Supply I128 model as specified in your order PSU24 40 1R 24 VDC power supply with Redel locking connector ADAP D9F MINIDIN D9 to mini DIN adaptor for serial communications ADAP LEMO BNC Lemo 00 to BNC coaxial adaptor for gate input USB memory stick containing I128 User manual PTC DiagnosticG2 software installation files Test data Optional items as specified in your order OEM customers will receive only components relevant to their application 1128 User Manual 1128 UM 141014 Page 11 of 121 PSI System Controls and Diagnostics 6
39. radiation background If there is any risk of vibration or movement then the use of low noise anti triboelectric cables is strongly recommended for the 128 electrometer inputs and the single channel integral input You can order suitable 44 way and 4 way terminated cables to specified length from Pyramid Technical Consultants Inc The high voltage cable should be coaxial with a DC rating sufficient for the maximum voltage you expect to use RG 59 is a good choice with a DC rating of 2 1 kV However many photomultipliers do not require a voltage this high and use a smaller coaxial cable such as RG 316 for convenience SHV connectors that accept this smaller cable size are available from Pasternack PE4498 and Tyco 5051426 8 and 51426 8 Trigger signals to and from the gate connectors should be sent in 50 ohm coaxial cable such as RG 174 or RG 316 You can use the widely available RG 58 coaxial cable with BNC connectors but you will need a Lemo ABF 00 250 CTA adaptor to the Lemo 00 coax connector on the I128 This is available from various suppliers such as Digikey 1124 1001 ND or Farnell 3817878 9 3 3 Signal current path The currents measured by the I128 must be allowed to return to their point of generation Depending upon the application the return path may be via the high voltage supply and or via The lab ground and the I128 case If there is no return path then you will see no current or erratic readings You may see curren
40. the default IP address 192 168 100 20 static 25 3 Front panel indicators 25 3 1 Power on The Pyramid triangle fractal logo illuminates when the unit is powered up 5 V digital voltage rail is present 25 3 2 Mode switch One amber LED Illuminated if the mode switch is in the diagnostic position 25 3 3 HV on One amber LED Illuminated if the HV supply is enabled 25 4 Rear panel indicators Four green LEDs Power Initiated O Active e Comm 25 4 4 Power Green LED 24 VDC power is present and 2 5 V rail is present 25 4 2 Initiated Green LED Unit has been initiated and triggered to acquire data 25 4 3 Active Green LED 1128 processor has booted and is running normally 25 4 4 Com Green LED A host communication channel is active 1128 User Manual 1128 UM 141014 Page 98 of 121 PSI System Controls and Diagnostics 25 4 5 Power up LED sequence On power up the Power LED illuminates and the remaining three status LEDs cycle in sequence during the boot up When the unit has booted the Power and Active LEDs should be illuminated The Com LED will illuminate when a host communication link is active and the final LED will illuminate when measurement is in progress 25 4 6 RJ 45 indicators Green LEDs incorporated in the Ethernet connector show that a connection has been established left hand LED and that messages are passing right hand LED 1128 User Manual 1128 UM 141014 Page 99 of 121
41. tn sensns enses senses states sensns enses ese en sensns 50 Current input calibrations Leere ee eese eee eese es tenentes etas tn sensns tns tn senses eese vosos to taiseni senses senses enn 51 ISA AAA 52 Firmware versions RRR 53 Communication settings RRR 53 IP Configuration control eeeeeee esses esee s eeose eseon tanso aeto esses o Ssn Eri essen etn suus 54 Graphics display with HCC display enabled eee eee cette eese esee ee etes eene tens etas tas tna s tnaeo 55 Scope mode capture of a pulse ssessssossossosssssosoesosssssossossossosoesoosossossossossosoesoesossossossossosssssesoesossossossoss 56 Strip chart data display showing cursor 4 ecce cete e eese eese eese enean stas tse tas etas tasto stas sense tneeo 57 Increasing the low pass filtering of the displayed data eese eee eerte teen etnannt 58 Zero correction of displayed data Lees e eee eee eese esee esee eee entes s tensa sesta setas etas etas tas sense taaeo 59 T128 physical layout RT 60 1128 block schematic A M nro DE Eaa 62 High voltage jumper settings eeeeeee eres eee e nentes tata ttn sensns tasto senses sese ta sensns tns Ssss eesosast 66 DEICBCTDBUDEC D
42. to PID Manual Calibrate the zero offsets of the outputs until you read 0 00V with zero demand set Then set 9 00 volts demand and set the gain so that the voltmeter reads this value Check at 9 00 volts and iterate as necessary to minimize the error Having calibrated the outputs you can use a loopback connection to calibrate the inputs against the accurate outputs 1128 User Manual 1128 UM 141014 Page 84 of 121 PSI System Controls and Diagnostics 21 Peak Fitting The 1128 implements a peak fitting algorithm as a fast FPGA calculation and the results are available for dosimetry decision making at rates up to the incoming data rate The results are displayed in the PTC DiagnosticG2 histogram display This is 1128 1 192 168 0 3 oe 0 0 Connected Busy Measuring Error Initiate Data Analysis Histogram Peak Peaks eshold 45 Gaussian Fit gaussabola Peak Min 0 00 0 00 Gaussian Fit regression Current A Display Full Statistics 1e 07 Windo 5 5e 08 Data 14 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124 128 Channel L oaas Y 50 z E No Avg Zero J 3 V Strip X Scope JA Histogram 1170 Samples dk ld Ionization Chamber a Setup J Calibration Interlocks State Idle Measuring Last Error a E L Properties Figure 53 1126 real time peak fitt
43. to make up one reading The actual charge integration time on the ADAS chip is shown slightly less than the integration time you enter as described above Acquisitions on all 128 channels are synchronized The HCC uses the same integration time and in that time it will take many individual ADC results At the completion of the sample period you get data from each electrometer channel and from the HCC which is averaged over the whole period Integration time Actual integration time lt A ADAS a Sample period Integration time HCC One reading Figure 39 Data feed into samples The amount of averaging to use depends as always on how you wish to trade off noise against bandwidth The longer your averaging period the more you suppress random noise but the more high frequency detail you lose If you happen to know there is a dominant noise frequency in your system say the line frequency or the switching frequency of a power supply then you can suppress this noise in the data if you set the integration period and averaging to match the noise period or an integer multiple of the period As an example if you have noise at 400 Hz then 1128 User Manual 1128 UM 141014 Page 69 of 121 PSI System Controls and Diagnostics choosing 500 usec integration and five conversions per sample will eliminate it as will five conversions per sample at 1000 usec 100 conversions per sample at 100 usec and so on If you have
44. 0 0 nA calibration current to any selected channel or to the HCC channel 0 for diagnostic purposes On the three higher current ranges of the HCC the second 2 500 uA calibration current source is used instead Calibration Calibration Current o Off Channel 40 HCC Figure 25 Calibration source control The I128 stores linear calibrations for all analog signal inputs and for the high voltage and general purpose analog outputs in non volatile memory The calibrations for the 128 electrometer channels and the HCC channel 0 are obtained by measuring the zero offset with no signal and with the accurate internal current source The gain figures you see when the calibration is complete are normalized to the nominal gain for channels 1 128 The offsets are in binary bits You can calibrate all 128 channels or any individual channel with the selection control Shane All 128 7 For the HCC there is a calibration for each current range Calibration values are written to non volatile memory when the calibration process completes In case you want to keep a record of the electrometer calibration before overwriting you can save a copy as a csv file with the Save Calibration Factors control ll 1128 User Manual 1128 UM 141014 Page 50 of 121 PSI System Controls and Diagnostics Current HCC Analog HV Gain Offset 42 106112 3 43 1 05976 0 44 1 06324 9 as 1 06001 0 45 1 06952 2 47 1 06917 11 4g 1 07001
45. 0 50 c2 97 50 0c Figure 29 Communication settings 1128 User Manual 1128 UM 141014 Page 53 of 121 PSI System Controls and Diagnostics Pressing the Configure button allows you to change the communications identity of the I128 the IP address assignment mode and the address and mask settings for static addressing If you alter these parameters you will need to re discover the I128 If you change to a static address outside your local subnet you will need to alter your network configuration to discover it again The Gateway and System Log address settings are for service and diagnostic purposes and should be left at 0 0 0 0 unless you are instructed to change them i128 0012 Mode IP Address DHCP 0 68 NetMask 255 255 0 0 Gateway 0 0 0 0 SystemLog 0 0 0 0 Note Changing these settings will Figure 30 IP Configuration control See section 27 for more details on network configuration 11 5 Screen layout Graphic display There are three ways of displaying incoming data in a graphical way as a rolling strip chart as a scope display and as a histogram Only the checked channels are displayed but all channels are always measured and logged You can toggle display of the HCC on or off with the control in the Data tab HCC The HCC display mode can be set independently from the 128 channel display In the peak fitting functions only the selected channels are used in the fit You may g
46. 014 Page 64 of 121 PSI System Controls and Diagnostics 13 High Voltage Supplies 13 1 Setting the High Voltage Supplies The 1128 is available with a one watt high voltage supply suitable for biasing ionization chambers The voltage range can be specified at time of purchase from 200 500 1000 and 2000V with either polarity 2000 V is typical for particle tracking chambers The A60 processor reads internal jumpers on JB2 to detect the supply rating Note that the supplies are not intended to deliver output voltage less than about 1096 of their maximum rating For higher power or more demanding applications the I128 can be supplied with a 4 watt supply Contact Pyramid Technical Consultants Inc for further information The front panel HV on LED illuminates when the high voltage output is enabled The set value can be adjusted at any time The outputs of the high voltage modules are filtered by an RC filter to reduce ripple and noise The filter time constant is reduced for lower voltage HV supplies to avoid excessive voltage drop at large current drains You can see the actual output voltage because readback is taken from a voltage divider after the filter directly on the HV output The voltage divider places a fixed 20 Mohm load on the supply The following table gives the smallest value of external load resistance that the various one watt supply options can drive at full voltage and the volts dropped across the filet seri
47. 06470 USA EMC TUV Rheinland North America 12 Commerce Rd Newtown CT 06470 USA Applicable Markings TUV FCC CE SAD Authorized by IG f I5 O President Pyramid Technical Consultants Inc Date 35 June aojr The Technical Construction File required by theses Directives are maintained at the offices of Pyramid Technical Consultants Inc 1050 Waltham Street Lexington MA 02421 USA A copy of this file is available within the EU at the offices of Pyramid Technical Consultants Europe Ltd Suite 3 Unit 6 7 Henfield Business Park Henfield BN5 9SL United Kingdom 1128 User Manual 1128 UM 141014 Page 120 of 121 PSI System Controls and Diagnostics 36 Revision History The release date of a Pyramid Technical Consultants Inc user manual can be determined from the document file name where it is encoded yymmdd For example B10 UM 080105 would be a B10 manual released on 5 January 2008 Version Changes I128 UM 130312 First general release I128 UM 141014 Update to cover revision 4 hardware channel 0 reduced input impedance and mode switching 1128 User Manual 1128 UM 141014 Page 121 of 121
48. 1128 User Manual 1128 UM 141014 Page 25 of 121 PSI System Controls and Diagnostics Synch message Remote device control en LAN Anode 2 HV feed sense Env sensors llok in t 1 li a x c LAN 128 X axis signals l l 1 E Iii E Li cs E E 128 Y axis signals Anode 1 HV feed sense LAN Env sensors LAN 128 X axis signals llok out 128 Y axis signals Anode 1 HV feed sense Figure 5 Schematic example 1128 installation for dual IC128 25 ionization chambers In this example we are supplying HV to two independent anode planes in each ionization chamber assembly one biasing the X Y strip readout section and the other biasing the integral plane section Primary and redundant environmental sensors temperature pressure and humidity are being monitored in each ionization chamber assembly Each 1128 reads out one axis of position sensing thus we need two per chamber in this case The integral plane input called the HCC in the PTC Diagnostic host software system is only used in two of the I128s in this example It can be used in I V converter circuit configuration or gated integrator configuration as required to best suit the particle beam current level and time structure Some ion chamber assemblies include two integral planes in which case all the available integral plane inputs would be used 1128 User Manual 1128 UM 141014 Page 26 of 121 PSI System Controls and Diagnost
49. 1128 allows you to set integration times between 55 usec and 1000 usec For the 128 electrometer channels this is effectively the period during which the incoming current is integrated on the feedback capacitors in the ADAS chip In actuality the integration can take place over a slightly lesser time with the exact requested integration period being made up by on chip buffer cycles This is why you will see slightly different full scale currents reported as you alter the integration time 1128 User Manual 1128 UM 141014 Page 68 of 121 PSI System Controls and Diagnostics When the HCC channel 0 is working in I V converter mode the integration time is used to determine how many ADC readings are averaged The conversion rate is 250 kHz thus for example if you have chosen 100 usec integration the HCC reading will be the average of 25 individual ADC conversions 14 3 Conversions per sample In order to achieve longer integration than 1000 psec you can select up to 255 conversions per sample The longest period is therefore 0 255 seconds for a lowest data rate of about 4 Hz The maximum rate is achieved using 55 usec integrations and one conversion per sample for a data rate of over 18 KHz A single I128 reading is therefore formed from a number 1 to 255 of integrations 55 usec to 1000 usec Figure 39 shows how individual integrations are combined into readings In the example we have chosen five conversions per sample
50. 2 500 uA They are used to perform the automated self calibration process The gain and offset parameters from the calibration are stored by the I128 in non volatile memory and used to convert incoming data to accurate charge values in coulombs The 500 nA source can also be routed to any individual input or to the HCC input on its most sensitive range under direct user control The 2 500 uA current can be routed to the HCC on its 1128 User Manual 1128 UM 141014 Page 32 of 121 PSI System Controls and Diagnostics three higher current ranges This allows a comprehensive diagnosis to be performed without any additional test equipment Calibrations are also stored for the optional high voltage module set and readback and for the general purpose analog inputs 10 6 High voltage output Most radiation sensors including ionization chambers require bias voltage and it is convenient if the source of this voltage is integrated with the signal readout You can specify high voltage modules of either polarity up to 2kV in the I128 Positive polarity is typical to match the positive current measurement range of the multichannel inputs Critical dose measurement applications mean that you must be sure that the bias voltage is reaching the ionization chamber The 1128 includes a loop back facility to give clear confirmation that the voltage is being delivered Your high voltage electrode should have two discrete connection points for high
51. 28 allows you to acquire time contiguous data at very high rates The maximum buffer size you can select is 65 535 However because the buffer is implemented as a cascade of memory and because data is always being sent up to the host computer during an acquisition the amount of available buffering can appear to be variable When you are acquiring data into the buffer at high rates the PTC DiagnosticG2 display will generally lag behind real time underscoring the fact that you are now taking data faster than it can be delivered to the host computer As an absolute minimum you can be certain to capture 664 contiguous readings at any data rate up to the 18 18 KHz maximum under any network traffic conditions For higher numbers of readings the maximum number of contiguous samples you can acquire will be the result of a race between the filling of the buffer levels by incoming data and emptying of the buffer by data being sent to the host Under typical moderate network traffic conditions you will find that up to 27 000 contiguous samples can be captured even at the shortest integrations Setting a higher buffer number will result in buffer overflow but the level at which this occurs will depend on the incoming and outgoing data rates As an illustration figure 40 shows the percentage of a 65535 sample requested count that was actually reached before overflow as a function of integration time between 55 and 1000 usec 18 18 to 1 KHz 1128 User M
52. 85 In 84 36 KGnd 7 Ch 82 In 81 22 Ch 83 In 82 37 KGnd 8 Ch 80 In 79 23 Ch 81 In 80 38 KGnd 9 Ch78 In 77 24 Ch 79 In 78 39 KGnd 10 Ch 76 In 75 25 Ch 77 In 76 40 KGnd 11 Ch74 In 73 26 Ch75 In 74 4 KGnd 12 Ch 72 In 71 27 Ch 73 In 72 42 KGnd 13 Ch 70 In 69 28 Ch71 In 70 43 Shield 14 Ch 68 In 67 29 Ch 69 In 68 44 Ch 67 In 66 15 Ch 66 In 65 30 Ch 65 In 64 1128 User Manual 1128 UM 141014 Page 93 of 121 PSI System Controls and Diagnostics Channels 97 128 MMS inputs 96 to 127 1 Chl25 In 124 16 Ch 127 In 126 31 Ch 128 In 127 2 Ch 124 In 123 17 Ch 126 In 125 32 Shield 3 Ch 122 In 121 18 Ch 123 In 122 33 KGnd 4 Ch 120 In 119 19 Ch 121 In 120 34 KGnd 5 Ch118 In 117 20 Ch 119 In 118 35 KGnd 6 Ch 116 In 115 21 Ch 117 In 116 36 KGnd 7 Ch114 In 113 22 Ch 115 In 114 37 KGnd 8 Chl12 In 111 23 Ch 113 In 112 38 KGnd 9 Ch 110 In 109 24 Ch 111 In 110 39 KGnd 10 Ch 108 In 107 25 Ch 109 In 108 40 KGnd 11 Ch 106 In 105 26 Ch 107 In 106 41 KGnd 12 Ch 104 In 103 27 Ch 105 In 104 42 KGnd 13 Ch 102 In 101 28 Ch 103 In 102 43 Shield 14 Ch 100 In 99 29 Ch 101 In 100 44 Ch 99 In 98 15 Ch 98 In 97 30 Ch 97 In 96 24 1 2 High voltage output and input Two SHV male
53. Changing the High Voltage Supply Range and Polarity The range and polarity of the high voltage supplies is fixed and must be specified at time of purchase Units may be returned to the factory to change the high voltage modules if necessary It not recommended that users change the high voltage supply modules in case of damage to the 1128 The jumper settings are given here for reference only JB2 1000 V 1000 V 500 V pum 500 V JB2 JB2 JB2 JB2 Figure 38 High voltage jumper settings 1128 User Manual 1128 UM 141014 Page 66 of 121 PSI System Controls and Diagnostics No jumpers installed in JB2 is interpreted as no HV option fitted Position 3 on JB1 is fitted if the 4 watt HV module option is installed otherwise the standard 1 watt module is assumed 1128 User Manual 1128 UM 141014 Page 67 of 121 PSI System Controls and Diagnostics 14 Samples Logged Data Integration and Averaging 14 1 Readings and logged data Each sample taken on the I128 comprises values for all the input signals plus a range of computed values The frequency at which readings are generated is shown on the PTC DiagnosticG2 screen and is determined by your selection of integration time and conversions per sample for the 128 electrometer channels Each reading comprises many data fields which you can see in detail if you
54. ERVICES seeeeeeeeeeee eene nennen nnne eerte nnne nnne 33 10 8 GENERAL PURPOSE I O ACTUATOR CONTROL eseeeeeeeeeenenee eene nennen nennen ennt r nennen enne nennen nenne 34 10 9 MAP EXECUTION AND INTERLOCKING 5 icto rese euer E eo aus Pe va rv ese E E vea Pepe ve ea sena rv es euer E EET eet 34 10 10 CONTROLLING REMOTE DEVICES FIBER OPTIC INTERFACES ccccccccconcnonononononononononononononononononononononononenenes 34 IO LT MONITOR UNIT OUTPUT A A recette uet e ete n o 35 10 12 COMMUNICATION TO THE HOST COMPUTER cccccccccccncnononononononononononononononononononononononononononononononononeneneneneneness 36 10 13 EMBEDDED SOFTWARE eet cette tios 36 11 GETTING STARTED USING THE PTC DIAGNOSTIC G2 HOST PROGRAM eeeeeeeeeeeeneeoone 37 11 1 Hi PB VH LR NECI 37 1128 User Manual 1128 UM 141014 Page 2 of 121 PSI System Controls and Diagnostics 11 2 CONNECTING TO THE 128 3 5 tete er t e er e mee eat mee ne det 38 11 3 SCREEN LAYOUT TOP BANNER tne ER RA M a DIAS e Ss 42 11 4 SCREEN LAYOUT RIGHT HAND TABS sseseeeseeeeeee eene eene nennen ee nnt rsen nnns sene rn sinere sienne een nnn nene nnns 43 11 4 1 AAN NT 43 11 4 2 D id analysis au ann e ERU e er NR UI RR ERE NR HR SA 45 11 4 3 lonization chamber daa NIS 46 11 4 4 SEUD Sek 47 11 4 5 C l
55. Jpr i poca d I LELE banks ipa D T Y pj x32 h E Gate in b 7 15V 12V 5V t4 Gate out 4 E 3 3V 2 5V 1 2V E Mon out q i Kau M T T HV on LED Ethernet RS 232 485 s gt Enable hd gt Safety HV out T A A relay V HV sense mm HV sense 7 Fuse 1 1A Mu gt i gt Mode m2 oo 1 HV loopback Q keyswitch i Y o2 i NE oa Relay Enable Enabled Interlock 24VDC n Figure 37 1128 block schematic 12 2 2 Calibration current switching A matrix of switches allows the currents generated by the two precision calibration current sources to be routed to the required signal input under software control 12 2 3 Analog signals The multichannel ADC also reads the two high voltage signals formed by voltage division and the general purpose analog inputs Three differential analog inputs are provided on the I O connector two of them are switched by a multiplexer MUX into one ADC input A multichannel DAC digital to analog converter provides the setpoint for the high voltage and the two general purpose analog outputs All analog inputs and outputs are buffered the inputs are also low pass filtered with 3dB at 35 kHz 12 2 4 Digital signals The general purpose digital lines on the I O connector are all buffered The TTL digital inputs are active low with 50 kohm pull up to 5V Two of the inputs are read by the A60 and two by the secondary FPGA The two opto isolated inputs on the actuator connector
56. N61010 but may nevertheless give a noticeable shock if misuse were to lead you to come into contact with them The user must therefore exercise appropriate caution when using the device and when connecting cables Power should be turned off before making any connections The unit must not be operated unless correctly assembled in its case Protection from high voltages generated by the device will be impaired if the unit is operated without its case Only Service Personnel as defined in EN61010 1 should attempt to work on the disassembled unit and then only under specific instruction from Pyramid Technical Consultants Inc The unit is designed to operate from 24VDC power with a typical maximum current requirement of 1000 mA A suitably rated power supply module is available as an option Users who make their own power provision should ensure that the supply cannot source more than 3000 mA A safety ground must be securely connected to the ground lug on the case Some of the following symbols may be displayed on the unit and have the indicated meanings 1128 User Manual 1128 UM 141014 Page 8 of 121 PSI System Controls and Diagnostics Direct current Earth ground terminal Protective conductor terminal Frame or chassis terminal Equipotentiality Supply ON Supply OFF CAUTION RISK OF ELECTRIC SHOCK gt PPO OH CAUTION RISK OF DANGER REFER TO MANUAL 1128 User Manual 1128 UM 141014 Page 9
57. The 1128 actuator port provides the control and feedback needed for a typical pneumatic actuator system This is provided for sensor systems that can be moved in and out of their measurement position The circuit provides a 24 VDC output on the connector so controlling a 24 VDC on off solenoid is simple A solenoid valve type known to work correctly is the SMC SY5120 5LN N7T F2 However solenoids using other voltages can be accommodated within the rating of the connector using the potential free relay contact pair and an externally sourced voltage I 1 5VD 8s amp 10K lt 10K 0805 NAA 5VD 10K Optoisolator A KA V VN V V vo 0805 2 vB ACTUATOR OPTO A la 45VD DB9F DAL CHASSIS OPTO IN A Vois DGND Optoisolator ACTUATOR OPTO B p V VN E 0805 Z va lg 200 mA fuse 7 24V 7 B ACT RELAY A Aa CHASSIS Relay ACT RELAY A LH els l EA 13 DGND Figure 46 1128 actuator control circuit A typical arrangement to control a 24V solenoid valve and read back end of travel limit switches is shown in figure 47 1128 User Manual 1128 UM 141014 Page 78 of 121 PSI System Controls and Diagnostics Opto A input a 24 VDC 24 VDC switched Opto B input 24 VDC Figure 47 Actuator connections for 24 VDC solenoid 1128 User Manual 1128 UM 141014 Page 79 of 121
58. ae esee 14 474 INTENDED USE Beer ub nda dams 14 7 2 CKEYXEEAXTURES con D rp edere 14 8 SPECIFICATION eteten peee eatae raae iia eben ean ret Qi ea ense obe Eva ee du Las ee pue anat Doudou to urere ee pe eL ea ova Cerea 16 9 INSTALLATION eeoreetecce t eesecce dnde aee e a abate e dove usa 23 9 p MOUNTING ice a 23 92 GROUNDING AND POWER SUPPLY 2 io rd E Rn RIDE IRE 23 9 3 CONNECTION TO SIGNAL SOURCE ccccccccccncncncnononononnnnnnnnnnonononononnnnnnonononononononononononononononononononononononononenenenenenes 24 93 L Typicabsetup dicunt OR EE Utere e unen etii 24 9 3 2 Cables 3 daa dos 27 9 3 3 Signal current DAMN seis a ea rated HR IRE e e aede tite ieu 27 10 HOW THE 1128 WORKS AND HOW TO USE IT AN OVERVIEW scccsssssccsssssccesssccssssscccsssscecens 30 10 1 MULTICHANNEL ELECTROMETER INPUT CHANNELS 1 TO 128 enne eene 30 10 2 INTEGRAL PLANE ELECTROMETER INPUT CHANNEL 0 HCC ccccsescessseceessseeceseneeeeeseeeeessneeseseeeeeneens 31 10 3 AGQUISTTION MODES oie et reete ertet tov rer idee t ventre te ree iter m ARE dades 32 10 4 TRIGGERING Aien etd id ae uus 32 10 5 SELF TESTING AND CALIBRATION oococccccccononononononononononononononononononnnnnnnnnononononononononononononononononononononononenenineneso 32 10 6 HIGH VOLTAGE OUTPUT eeeeeeeen nnn hn nennen enne enne e eene eene eene eene nene eene e eere ener enne eene eren nnne nennen enne nnn 33 10 7 GENERAL PURPOSE I O IONIZATION CHAMBER S
59. agnostic mode Key is retained when in Diagnostic Mode 25 2 Rear panel controls 25 2 1 Address switch 16 position rotary switch setting device address for use when you have the 1128 on a fiber optic loop Choice of address is arbitrary but each device in a fiber optic loop system must have a unique address This communication mode is not currently supported in the I128 Setting Function 0 Reserved to loop controller 1 15 Available address settings If you are using the I128 as a loop controller the address switch has no function 25 2 2 Mode switch 10 position rotary switch setting for serial communications mode This switch is read if a connection is made to the serial connector The ASCII protocol is provided for diagnostics using simple terminal programs Setting Function 8 bit binary 115 kbps RS 232 8 bit binary 57 6 kbps RS 232 8 bit binary 19 2 kbps RS 232 ASCII 115 2 kbps RS 232 ASCII 57 6 kbps RS 232 ASCII 19 2 kbps RS 232 8 bit binary 115 kbps RS 485 8 bit binary 57 6 kbps RS 485 ASCII 115 2 kbps RS 485 ASCII 57 6 kbps RS 485 OO C N DAD NB CPN R oO 1128 User Manual 1128 UM 141014 Page 97 of 121 PSI System Controls and Diagnostics 25 2 3 Reset button Momentary push button that forces a warm reset of the on board processor Holding the button for 5 seconds at the start of boot up forces the 1128 to
60. amples To demonstrate the triggers we provided a simulated repetitive beam pulse as a Gaussian pulse yellow delivered to a group of channels and to the HCC The period was 10 msec This pulse was synchronized with a TTL trigger blue as shown in figure 41 Source CH2 Slope Mode Coupling Figure 41 Signal and trigger used for custom trigger examples The 1128 was set up to measure with 100 usec time resolution thus there would be exactly 100 readings per signal repetition period As a reference let s look at the signal in internal mode 1128 User Manual 1128 UM 141014 Page 73 of 121 PSI System Controls and Diagnostics 1128 Electrometer gr e O e A initiate N sop Jf Setup 2 5e 07 Measuring Trigger HCC Peak Buffer Contiguous Data Mode Internal M 9 Initiate Command 2e 07 StartOn 5 Burst Size Pause Or _ 15e 07 Stop Count A Stop On 3 3 1e 07 5e 08 4 Y 50 E Noo 7 Zero 3 V Strip X Scope J Histogram J 5716 Samples dk ll 07 Current A Figure 42 Time varying signal seen in internal mode The signal appears noisy and there are discontinuities If you inspect the csv log you will see that the data is not contiguous due to the communication speed limitation If you now select Custom triggering and a stop count of 10000 you will now see one second contiguous data at 10 kHz sample rate 1128 Electrometer mauu JE O O y Initiate Stop Y EN Set
61. anual 1128 UM 141014 Page 71 of 121 PSI System Controls and Diagnostics c 3 o o a o vo 00 o x 400 600 800 1000 1200 Sample period s Figure 40 Contiguous data number of samples as a function of input data rate Before taking any critical time resolved data you should test the available maximum number of samples under the expected network and host computer worst case loading We recommend that you also set a maximum number of readings the Stop Count when using the data buffers to avoid arbitrary overwriting of the data 15 2 2 PTC DiagnosticG2 buffer The PTC DiagnosticG2 has its own circular data buffer with a maximum of 100 000 entries This is independent of the I128 buffering If you allow an acquisition to run longer than this and recover the log file you will see that the data has wrapped around The oldest entries will be overwritten If you wish to clear the buffer You can clear the Diagnostic buffer at any time with the Clear the data buffer button i You can save the current buffer contents to a csv format file at any time using the Save the data buffer to a file button lll 15 3 External triggering 15 3 1 Custom triggering The 1128 will respond to edges on the gate input to start pause and stop acquisitions Using the Custom trigger mode allows you great flexibility in choosing when and how the I128 should take data and how data taking shou
62. ated to the overall dosing accuracy of the system and the maximum amount of charge that could be delivered in error before there would be concern The monitor unit of dose can be correlated with the charge measured by the I128 when it is used in the dosimetry and beam position tracking application You can define the size of the measured charge increment that will result in the output of a monitor pulse by the I128 The pulse is delivered on the monitor output coaxial connector and can be configured for TTL levels or fast negative pulses It can also be transmitted from the process status fiber optic transmitter if required Typically these pulses might be used to drive independent dose counters or audible sounders 1128 User Manual 1128 UM 141014 Page 35 of 121 PSI System Controls and Diagnostics 10 12 Communication to the host computer The 1128 provides three alternative communications interfaces to the host computer You must work with a suitable host computer and software to set up acquisitions on the I128 and read back and display the results The most commonly used is the standard 1000 100 10BaseT Ethernet interface which supports TCP IP and UDP protocols The 1128 can serve multiple clients on the network There is also a 10 Mbps serial fiber optic channel which provides compatibility with the Pyramid Technical Consultants Inc fiber optic real time loop controllers and thus the complete range of Pyramid products The fi
63. ation recommences This means there is minimal dead time and any current arriving in the dead time is anyhow measured Digital reconstruction produces a version of the integrator output with resets suppressed 10 2 Integral plane electrometer input channel 0 HCC The separate single channel electrometer input labeled channel 0 or HCC high current channel is optimized for accurate fast dosimetry from integral plane electrodes It provides larger upper dynamic range and faster digitization than is possible with the multichannel inputs and it is fully bipolar The data rate and averaging is coordinated with the multichannel inputs so that charge readings from 128 1 channels are taken every integration period The HCC can be used in one of two modes selected by software control and you can choose the mode best suited to the size and time profile of your signal One mode is a charge integrating circuit similar to the multichannel inputs but with more dynamic range The feedback capacitor resets are linked to the integration period and there is a small deadtime during the reset This mode is well suited to the measurement of small currents less than 1 nA at longer integration times and for the measurement of regular pulsed beam signals where the capacitor reset can occur when the beam is absent The alternative mode uses a current to voltage conversion circuit also called an I V converter or transconductance amplifier This mode is sui
64. ber optic interface can alternatively be used to connect slave devices to the I128 for example the Pyramid M10 device to provide extended I O capability Finally a serial interface which can be operated with RS 232 or RS 485 levels provides a simple interface for applications where high data rates are not needed such as service diagnostic operations The I128 will support parallel communication on Ethernet and serial interfaces 10 13 Embedded software The 1128 runs an embedded version of the Linux operating system on NIOS processors implemented in the FPGAs Four firmware files make up a full release and you can update with a single file which integrates all the releases and thus ensures that you have compatible versions Where multiple I128s in a system might be running 1128 User Manual 1128 UM 141014 Page 36 of 121 PSI System Controls and Diagnostics 11 Getting Started using the PTC Diagnostic G2 Host Program The PTC DiagnosticG2 is a stand alone program which allows you to read graph and log data from the I128 and set all the important acquisition control parameters For some applications or for initial work it may be adequate for all of your data acquisition needs The 1128 is designed to be a key component of a dose measurement and control system however and thus provides many functions beyond basic signal acquisition Most of these functions are exposed in the PTC DiagnosticG2 so that you can explore their operati
65. cal bar This mode emulates a graphic equalizer or ratemeter and can be useful for instrument tuning On the 128 channel histogram you can see the peak shape and use the peak fitting functions 11 5 4 Cursor Clicking in the graphic area adds a cursor color coded by channel which gives the count at that time strip display or continuously in the channel histogram 1128 User Manual 1128 UM 141014 Page 56 of 121 PSI System Controls and Diagnostics i128 0012 192 168 100 68 ee Em o Connected Busy 0 Measuring Error Initiate Stop Setup Measuring Trigger HCC VV Buffer Contiguous Data Mode Custom 2 5e 08 Initiate Command BNC Rising Edge y 28 08 Y Stop Count 2560 Stop On BNC 1 5e 08 Current A E 5e 09 0 13 0 135 0 14 kal Save Configuration 5 y E noava zero 3 stip X Scope 7X Histooram 7 State Idle Last Error Figure 33 Strip chart data display showing cursor 11 5 5 Filtering and zero subtraction You can low pass filter the displayed data with averaging value A using the IIR algorithm Y X A 1 T 1 A Y 1 where Y is the latest output of the filter Y is the prior output of the filter and X is the latest reading from the I128 Note that the data is not altered only the way it is displayed so you can change between various amounts of filtering at any time Figure 34 illustrates how the disp
66. choice 1128 User Manual 1128 UM 141014 Page 70 of 121 PSI System Controls and Diagnostics 15 Triggers and Data Buffering The 1128 offers great flexibility for collecting data and triggering to synchronize with external events The primary trigger modes are Internal and Custom The other modes exposed in the PTC DiagnosticG2 software are provided mainly for backwards compatibility with other devices they can all be achieved with particular custom configurations 15 1 Internal trigger mode If you simply want to stream data continuously from the 1128 then the Internal trigger mode achieves this Don t check the Burst Count or Stop Count boxes When you press Initiate the I128 will start streaming data to the host computer and will continue until you abort the acquisition The PTC DiagnosticG2 strip mode and histogram graphics will keep up with real time shown under the strip mode plot as the time in seconds since the Initiate The data rate is limited by communication rates over the Ethernet however and by the load on the host computer Thus beyond a particular data sampling rate there will inevitably be missing readings in the record The critical rate will generally be close to the Comms rate displayed on the PTC DiagnosticG2 normally about 20 Hz Whether you care about getting contiguous data will depend upon what you are trying to measure 15 2 Data buffers 15 2 1 1128 internal buffer The internal memory of the 11
67. ck to base calibration service for the 1128 1128 User Manual 1128 UM 141014 Page 116 of 121 PSI System Controls and Diagnostics 32 Returns procedure Damaged or faulty units cannot be returned unless a Returns Material Authorization RMA number has been issued by Pyramid Technical Consultants Inc If you need to return a unit contact Pyramid Technical Consultants at support ptcusa com stating model serial number nature of fault An RMA will be issued including details of which service center to return the unit to 1128 User Manual 1128 UM 141014 Page 117 of 121 PSI System Controls and Diagnostics 33 Support Manual and software driver updates are available for download from the Pyramid Technical Consultants website at www ptcusa com A secondary site can be found at www ptceurope com Technical support is available by email from support ptcusa com Please provide the model number and serial number of your unit plus relevant details of your application 1128 User Manual 1128 UM 141014 Page 118 of 121 PSI System Controls and Diagnostics 34 Disposal We hope that the I128 gives you long and reliable service The I128 is manufactured to be compliance with the European Union RoHS Directive 2002 95 EC and as such should not present any health hazard Nevertheless when your 1128 has reached the end of its working life you must dispose of it in accordance with local regulations in fo
68. crews from the rear top surface and slide the cover backwards to disengage from the front panel o NS A Figure 67 Fan power connector 2 pin Molex The I128 is fitted with a 1 1 amp automatically resetting positive temperature coefficient PTC fuse in the 24 VDC input No user intervention is required if the fuse operates due to overcurrent The fuse will reset when the overcurrent condition ends 31 2 Calibration Run the internal calibration function of the I128 periodically Make sure there are no signals present at the inputs when doing this It is good practice to note any changes in the gain and offset parameters because any trend would indicate that the affected channel might be out of specification Depending upon your application and your operational procedures you may need to check the accuracy of the I128 against an external traceable current standard periodically This is particularly the case for the high current channel HCC which is typically used for dosimetry External calibration can be done with any suitably rated true current source such as the models available from Keithley Since the I128 has high inherent accuracy you must ensure that your reference source is in calibration The compliance voltage of the reference source should be set to between 1 00 and 5 00 V and you should ensure that there is a well defined current return path from the 1128 back to the source Pyramid Technical Consultants Inc offers a ba
69. d one opto isolated digital input that are intended for interfacing interlock signals The connectors are Weidmuller 3 81mm type with different pin counts to prevent accidental swapping The relays can be configured to work in current loops or as 24V logic A 24 VDC supply is provided fused at 300 mA In either case it is a simple matter to put multiple I128s and A560s into a series interlock loop such that any one of them can interrupt the line and thus provide redundant interlocking 1128 User Manual 1128 UM 141014 Page 80 of 121 PSI System Controls and Diagnostics 24 Le RET e tt a p E Ww a r3 gw q VERD E To interlocked device E lu a E ma B d ma E e VE REED ERRE To interlocked device Figure 48 Interlock relays in series on multiple devices wired for current loop top or 24 V logic bottom 18 2 1 Enable Status Pala la AAA X LN o ol o oloo oo Enable Enabled Mode Y Cmd Status i Key Figure 49 Enabled Status interface This group of signals receives an enable command from the overall system containing the 1128 via an opto isolated input and echoes out the enabled state when it is reached on a floating relay contact pair The inp
70. d s M AL aE 64 13 HIGH VOLTAGE SUPPLEIBS sissssactsctecticcscesstesncccessedesnaseoctsenscsuconssecdesnedsosacusascescaiseaeseatestcededcnessastentecdeseseaea 65 13 1 SETTING THE HIGH VOLTAGE SUPPLIES c ccccssssccessssecessseeecsssneeeessseeesssueeessneeseeseseeeseeeeesssaeeesssaeeeseaaees 65 13 2 CHANGING THE HIGH VOLTAGE SUPPLY RANGE AND POLARITY eese nene nene 66 14 SAMPLES LOGGED DATA INTEGRATION AND AVERAGING eee eeee ee eene eene etta esten ee tnaue 68 14 1 READINGS AND LOGGED DATA 5 er ieeseee ede es tite cete ea sancuacasabiaechachddasacshduectectdesstdebdeachecbseessevsduedecese 68 14 2 INTEGRATION TIME 4 2 eot ede dene p Om aep Re ie diee 68 14 3 CONVERSIONS PER SAMPLE 5 ciere ete Ed ee data et e eee reset ee eee blah 69 14 4 GENERAL PURPOSE ANALOG INPUTS c ccccsesccessssecesenseeeesesseeesssaeeeseaeeessenseeeseseeeessaaeeesseseeecseeeseneseeessags 70 15 TRIGGERS AND DATA BUFFERING j ccccccsssccsssccsssscsssscssscsssccsssccsscssssssssscssssssssssssssssssscssssssessssesssee 71 15 1 INTERNAL TRIGGER MODE ti tote mire eer o kis E db ie cence Gago Hte eee ets 71 15 2 DATA BUEFERS tee Ree ian e eue eec ae 71 15 2 1 1128 internal bull anio ara teen aan 71 15 2 2 PIC Did gnostic G2 buffer iia 72 15 3 EXTERNAL TRIGGERING t 2 dee e e e e ent epe tee ete aet ecient 72 15 3 1 Custom rig gering Lu ie ie ri a bs CE VUA RCM tad Yep uae 72 15 3 2 Pre defined trigger modes
71. dependent parallel Input impedance 3 kohm Dynamic current range 50 nA to 550 nA typical all integration times Higher current ranges achieved by input current division can be chosen as factory configuration options Dynamic charge range 32 pC 55 usec integration to 500 pC 1 msec integration Longer accumulations up to 0 255 sec achieved by numerical summation Noise charge lt 0 1 pC rms typical at 100 usec integration no averaging 0 05 pC rms typical at 1000 usec integration no averaging Input offset current 10 pA or before zero correction Offset drift 2 pA over one hour after stabilisation and with temperature maintained to 2 C measured with 1 msec integration 100 sample per reading Integration time range 55 60 75 100 125 975 1000 psec Gain uniformity Better than 0 1 across all channels after calibration Calibration current 500 00 0 1 nA temperature coefficient lt 5 ppm C 1 Digitization 20 bit delta sigma conversion rate linked to integration period Conversion rate 18 1 kSa s maximum Simultaneity All channels converted at once within 200 nsec Integral plane input I V converter mode Number One software selectable alternative to gated integrator Input impedance ohm Dynamic range 20 uA down to 1 nA Input offset current lt nA
72. e fact that the logarithm of a Gaussian curve is a second order polynomial which can be fitted without iteration using matrix inversion 1128 User Manual 1128 UM 141014 Page 45 of 121 PSI System Controls and Diagnostics The Gaussabola algorithm is very efficient because it only uses three channels and finds the unique parabola that passes through the logarithm of the data The threshold value determines how far the second and third strips used in the fit are from the highest channel If the adjacent channels are nearly the same height as the peak greater than threshold of the peak then the algorithm steps outwards until it has strips with different heights to fit to This algorithm is optimal if the peaks are narrow a few strips wide but it takes no information from the tails of wider peaks and can be susceptible to noise For most purposes the Gaussian regression fit is more dependable The Gaussian regression fit performs the best fit out to the points either side of the highest channel where the signal drops below noise threshold of the peak channel signal unless clipped to less by the window setting You can also set the weighting used in the fit the nominal setting is 2 for which the data points are weighted by the square of the raw data This algorithm has good noise immunity and is generally preferred unless the peak shape deviates greatly from Gaussian If the window is set to 1 then the regression fit and the th
73. e maps from a host computer and execute those maps in synchronization with other devices monitoring the incoming signals from ionization chambers and reacting to out of tolerance conditions Three relays one of them a safety rated type are available for use in system interlock loops and for general hardware level status communication The relays allow the I128 to respond to various levels of deviation from the map or any internal failures by breaking different system interlock loops that can be arranged produce the appropriate shutdown response The safety relay circuit would be allocated for the most critical A front panel keyswitch allows you to select a Diagnostic mode for testing where the response to deviations is modified The key cannot be removed when in Diagnostic mode so that the system can be locked into Normal mode by removal of the keys The state of the mode switch is echoed to a rear panel relay connection 10 10 Controlling remote devices fiber optic interfaces There is a wide range of devices available that communicate over the Pyramid 10 Mbps fiber optic loop system The 1128 includes two loop ports and can perform a loop controller function With a single host computer connection to the I128 you can communicate with up to 30 other devices 15 per loop One example application is the use of a remote M10 or M40 general purpose I O device to interface to accelerator controls to command beam current and read back status
74. e vertical y axis is the current You can select automatic or fixed vertical scaling When the data you have acquired exceeds the horizontal axis capacity a scroll bar appears below the graphic This allows you to move backwards and forwards in the data that has been buffered by the PTC DiagnosticG2 You can do this while the acquisition is taking place and after it has completed 11 5 2 Scope display The model for the scope mode display is a digital oscilloscope and it is most useful when you are working in buffered burst external triggering mode If you have a data burst defined then the screen is written with the contents of the burst when it completes and then waits for the next burst Thus if there is a repeating signal such as a beam pulse then you can obtain a display 1128 User Manual 1128 UM 141014 Page 55 of 121 PSI System Controls and Diagnostics synchronized with the pulses If there is no burst size defined then the screen is refreshed after each data packet of 256 samples The graphic looks the same as the strip display 1128 0012 92 168 100 68 e AH c Connected Busy Measuring Error Setup Measuring Trigger HCC Y Buffer Contiguous Data Mode Custom Y Initiate Command Start On eel BNC nne Ede Current A State Idle Figure 32 Scope mode capture of a pulse 11 5 3 Histogram display The count or rate in each channel is displayed as a verti
75. ecorded reading because the trigger edge timing is asynchronous relative to the integrations The worst case delay is one integration period of the 128 channel ADAS chip but on average it is less than half of this time Thus if you want to minimize the uncertainty in the trigger response it is best to use short integration times If you need better signal to noise ratio simply increase the number of conversions per sample as this does not affect the trigger delay 1128 User Manual 1128 UM 141014 Page 76 of 121 PSI System Controls and Diagnostics 16 Monitor Pulse Output The monitor output allows the I128 to output Monitor Units MU analogous to earlier electronics A counter can be connected to this output to provide an independent log of measured dose in a medical application If there is a dramatic failure during an irradiation the count of monitor pulses permits you to make some assessment about the dose delivered up to that point The size of one MU is a configurable amount of charge accumulated on the HCC The signal is available as a one usec TTL logic pulse into a 50 ohm load or as a transformer coupled 50 nsec negative going pulse The selection is made at time of manufacture M Pos 0 000s Figure 45 Examples of monitor output pulse TTL left transformer coupled right 1128 User Manual 1128 UM 141014 Page 77 of 121 PSI System Controls and Diagnostics 17 Actuator Control
76. ectrometer chip and supporting logic all external connectors apart from Ethernet and fiber optics and local power regulators Fiber optic mezzanine board A60 processor board including the Ethernet port processor and memory Figure 36 1126 physical layout The boards can be exchanged individually for service or upgrade We recommend that such work is only done by a suitably qualified person 12 2 Functions 12 2 1 Signal current inputs Channels 1 to 128 come in to the ADAS electrometer chip via a resistive current divider In the default configuration the resistors to ground are not fitted so there is no division The series input resistor is then 1 kohm which provides transient protection For higher maximum current ratings the resistors are configured as precision dividers 1128 User Manual 1128 UM 141014 Page 60 of 121 PSI System Controls and Diagnostics Channel 0 high current channel or HCC provides two inputs on separate pins of the connector each protected by clamping diodes There are two signal processing chains a multi range I V converter and a gated integrator The inputs can be directed in one of the following ways under software control 1 Input A to I V converter input B to ground 2 Input B to I V converter input A to ground 3 Input A to gated integrator input B to ground 4 Input B to gated integrator input A to ground As a build time option DSUM this can be changed to the fo
77. ed 24 2 5 Powerinpit 24 VD sete oo RU RERO IER ERES 24 2 6 Ground We e eii e tee rate tti a hibet e 25 CONTROLS AND INDICATORS ccssssssesssceocsssnicossssssenssssdssesncss cesvenadsocsstenessnsasdendsssedsoonssb cabensessecsssacedensses 25 1 FRONT PANEL CONTROLS sos 22e initial HERE te etuer dde ee ERE 25 1 1 Key SWICh ie ed AA tem e PR qt ettet Wit i viec tege pura 25 2 REAR PANEL CONTROLS 5 iocis eei estet a SHE A C RESTO FREQ sh acbacd QU EUN UT E eA Ie UU CARRY agen ep ee Te 25 2 1 Address Wichita NE TEE TIE 25 2 2 Mode Wi ae tetti iiti tenuitate 25 2 3 OAZBATMONDI TEE 25 3 FRONT PANEL INDICATORS e eet Re Ru RUSSE HE RR RE E QVI RESP vacua AERE babies cucadansovbanduanneuece ERE da ERES 25 3 1 Iun uam 25 3 2 Mode Willi ttes anita Th EER ON ads es 25 3 3 TLV gt CE AES 25 4 REAR PANEL INDICATORS ER IT 25 4 1 POW OR m 25 4 2 Mitad ETE E ERE 25 4 3 LI C MES 25 4 4 COMA D HERI QU Ua NAMEN III EM 1128 User Manual 1128 UM 141014 Page 4 of 121 PSI System Controls and Diagnostics 25 4 5 Power up LED SCQUENCE a iiti v te devoti eve teet e een e neris 99 25 4 6 JA ER LITT OS T t 99 26 COMMUNICATIONS INTERFACES ees eee eee eoe ea se aee Haut a
78. eee ea paa E Ce aeo ee uer EG ee Fee acen aaa ee TUR aea Va ae PUE 100 26 1 ETHERNET asi esee d dete i epe dd 100 26 2 WEB SERVER iras 100 26 3 RS 232 CONNECTION ccccccccccecssesesesccececececececececececeseseseseseeeseseseseseseceseseeeeesesececeeeeeeeeeceeeeeceeecececeseceeeeers 101 26 4 RS 485 CONNECTION EXAMPLE 5 4 ectetur nette netten eode eei gato eee ee bent tt eode beta vedo oce ce aav 102 26 5 FIBER OPTICS RR TRENT T R A 102 27 USING THE I128 ON A NETWORK e eee osa een aao eta aaa eo ena aae ba Eno eee p aa SUPER a aa EIE Eee eR TYPE ne Ie eso EE Pa eU p aso een 104 27 1 NETWORK CONFIGURATION Sa 104 27 2 RECOVERY FROM UNKNOWN IP ADDRESS ccccscccesesesecesesesecesececececececececececececececececececececececececececececevess 105 27 2 1 RESCCAEDIO dime som co brett o ee dete EM ern e lath ae 105 27 2 2 Using the serial port i a out itta ui aeo ecu aite 106 27 3 SYSTEM LOG ADDRESS iiie eee Re e ettet tpe sabwoads crested e e thor ate es 106 28 ASCH COMMUNICATION 107 28 1 USING PUTTY TO TEST THE SERIAL ASCII CONNECTION eere nnn 107 29 CREATING A HOST SOFTWARE APPLICATION ssscccsssssscsssssccesssccssssscccsssscccsssscccsssssccessscsessnse 109 KNEE A ette ko bress os Toso s tos Eese Toes E EEEa pe eSEE eE e esso etopo iess iesst a iieis 110 31 MAINTENANCE DR
79. egative current measurement range to allow for baseline noise fluctuations The voltage output of the integrator circuit is digitized and read out in the background for all channels without disrupting the accumulation of charge The binary values are extracted by the FPGA and converted to floating point charge values using individual stored calibrations for each channel Up to 256 successive accumulations can then be digitally averaged to provide longer integration times o Reset Crack logic O vo Sensor capacitance v WV Figure 8 Multichannel electrometer input one of 128 identical parallel inputs chl to 128 Like all integrators the charge accumulating on the feedback capacitor must be removed periodically or the voltage would rise beyond the span of the analog to digital converter ADC This is typically done once per user selected integration period However in the 1128 ADAS circuit there is a conditional resetting scheme which uses switches to remove the charge from the capacitor while also isolating the input when the ADC approaches full scale input Resets therefore only occur when necessary and are not tied to the integration period 1128 User Manual 1128 UM 141014 Page 30 of 121 PSI System Controls and Diagnostics Current still arriving during the short reset event is stored on the input capacitance cable and ionization chamber and is measured when the integr
80. es resistor at maximum current HV module Current Smallest load Filter time Filter series Voltage drop Voltage drop rating resistance constant resistor across filter across filter no load full load 2000 0 5 mA 4 3 Mohm 110 usec 33 2 kohm 1V 17 V 2000 1000 1 0 mA 4 3 Mohm 110 usec 33 2 kohm 2V 34 V 1000 500 500 2 0 mA 250 kohm 16 usec 4 7 kohm 0 1 V 10 V 200 200 5 0 mA 40 kohm 0 0 0 0 If the readback value differs from the setpoint by more than the expected drop across the filter resistor you know that the output is either being overloaded by a low resistance to ground or that it is being driven by another source of higher compliance Be aware of how the high voltage readback calibration might affect this We recommend that the calibration is done with no connection to the HV outputs Thus only the no load voltage drop across the filter is hidden by the calibration and when you connect a load you should expect to see small reductions in the measured voltage up to the maxima given in the table The measured voltage is the actual voltage at the output connector 1128 User Manual 1128 UM 141014 Page 65 of 121 PSI System Controls and Diagnostics CAUTION A Do not connect an external power supply to the 1128 external high voltage output that will drive the built in supply away from the voltage it is trying to regulate or you may cause damage to the 1128 13 2
81. esult in one monitor pulse Triggers and gating Trigger modes Internal autorun Custom control of start pause and stop conditions using gate input and internal buffer counts Gate input TTL levels into 10 kohm Gate output passthrough TTL levels into minimum impedance of 50 ohm Latency Less than 50 nsec between gate input and gate output Interlocks Safety relay Potential free safety rated relay contact pair for use in critical external safety interlock chain Relays General purpose relay contact pair for general external interlock use with internal sensing of relay state General purpose relay contact pair for signalling enabled state of the 1128 to external devices Enable input Opto isolated digital input for receiving command for the 1128 1128 User Manual 1128 UM 141014 Page 18 of 121 PSI System Controls and Diagnostics to go to enabled state Communication interfaces Ethernet Ethernet 10 100 Base T TCP IP and UDP RS 232 115 2 kbps serial RS 485 115 2 kbps serial Fiber optic 10 Mbps binary serial protocol For integrating into Pyramid systems architectures Controls and indicators Controls Normal mode diagnostic mode keyswitch front panel Position of switch can be sensed directly by external devices via potential free contact pair Rotary switches for communications mode and fiber
82. et meaningless fits if you remove critical channels from the fit input data 1128 User Manual 1128 UM 141014 Page 54 of 121 PSI System Controls and Diagnostics i128 0012 192 168 100 68 Sn ES MA Busy Measuring Error Initiate 2e 07 Data Units A xd All Channels Banks Peak i Channel 1 5e 07 Data A 10 1e 07 Hoes Current A 5e 08 Soe A Boa Uv 48 1 7940 07 Beam Enabled _ Target Reached Q Analog Data V DAC V 5e 08 14 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124 128 Channel Zero 3 Strip 7 Scope JA Histogram Y Auto mil 8 2019e 07 No Avg 9026 Samples de be 0 000 gt 8 20185e 07 lt 0 000 y 8 2018e 07 E Y 8 20175e 07 100 L 3 20 O 8 2017e 07 300 8 20165e 07 49 Lol 440 445 450 Data Analysis Y Auto gt zero V Strip Scope X Histogram J ME Ckm aT 9026 Samples di No Avg Interlocks Setup Calibration State Idle Measuring Last Error Properties a Figure 31 Graphics display with HCC display enabled 11 5 1 Strip display Data from the selected channels with the selected averaging is plotted onto a rolling strip chart as it is acquired The model is a chart recorder The horizontal axis is the time of acquisition and th
83. examine one of the csv log files In summary these fields are timestamp Time in seconds when the reading was taken starting from zero when the acquisition sequence started triggercount A sequential number for the reading mod 256 These numbers allow you to see very easily whether you have contiguous data overrange 1 2 3 4 Flags that get set if any of the 128 channels goes overrange on any individual conversion Grouped in banks of 32 channels channel 1 2 128 Measured charge values in coulombs for each of the 128 electrometer channels centerA widthA amplitudeA offsetA confidenceA Real time peak fitting results for the first peak in the 128 channels of data centerB widthB amplitudeB offsetB confidenceB Real time peak fitting results for the second peak in the 128 channels of data This is primarily used when you have two 64 strip sensors being read by one I128 hcc Measured charge value in coulombs from the high current channel channel 0 hcc dose Dose remaining from the hcc target dose analog in 1 2 Measured signal on the two general purpose analog inputs typically used for environmental monitoring of an ionization chamber analog out 1 2 Settings of the two general purpose analog outputs digitals Settings of digital inputs and outputs Fields that do not receive data are reserved for future firmware updates 14 2 Integration time The
84. feet long 6 5 Trigger distribution X22 Bi directional optical to TTL converter CAB L00 xx LOO Cable coaxial Lemo 00 to Lemo 00 xx feet long 1128 User Manual 1128 UM 141014 Page 13 of 121 PSI System Controls and Diagnostics 7 Intended Use and Key Features 7 1 Intended Use The 1128 is intended to provide complete readout and control for position sensitive ionization chambers A single I128 can read out a 64 by 64 cathode strip chamber which also includes an integral plane cathode Two I128s can read out a 128 by 128 strip chamber and two integral planes Such chambers are typically used to provide beam analysis in particle beam therapy systems The integral plane input provides a choice of I V converter or gated integrator operation The former is particularly suited to measurement of continuous beams such as those delivered by isochronous cyclotrons or slow extraction synchrotrons and the latter is particularly suited to measurement of pulsed beams such as those delivered by synchrocyclotrons or fast cycling synchrotrons In order to convert measured currents from such ion chambers to the current in the ion beam passing through the chamber it is necessary to know the beam energy the chamber geometry the filling gas constituents and the filling gas pressure and temperature The 1128 includes inputs that allow it to measure the pressure and temperature directly using sensors that may be integrated in the chamber The tra
85. gate signal unable to drive the I128 input impedance 2 5 kohm or any added terminating impedance Tee off signal and check amplitude on oscilloscope Use suitably rated trigger source 1128 User Manual 1128 UM 141014 Page 112 of 121 PSI System Controls and Diagnostics No or low high voltage Shorted to ground in external circuit Monitor HV reading zero or very low relative to setpoint Monitor value recovers if C400 disconnected from the external circuit Eliminate shorts to ground External load resistance too low Voltage recovers if setting is reduced Do not attempt to draw more than 1 watt from each high voltage supply Higher power modules are available to special order High voltage not at setpoint A high compliance source such as a charged particle beam is driving the HV electrode Monitor value recovers if C400 disconnected from the external circuit Change geometry to reduce beam strike Cannot set high voltage Trying to set above the maximum allowed value soft limit Sets OK if a lower value is chosen If allowed increase the maximum allowed value Unable to communicate via Ethernet Incorrect IP address for 1128 or host not in the same subdomain Check settings of 1128 host PO Use consistent IP addresses Messages being blocked by anti virus software Disable anti virus software Set up allowed channe
86. ge is seen after you send Initiate and continue indefinitely if unbuffered If buffered it will do NBst readings on each valid trigger edge until it has acquired NBuf readings External StartStop BNC n a BNC Acquisition will start when a valid trigger edge is seen after you send Initiate If unbuffered readings will continue until the opposite polarity trigger edge is seen If buffered it will stop on the lesser of NBst or Nbuf readings or on the opposite polarity trigger edge whichever comes first External StartHold BNC n a n a NBst is forced to a value of 1 in this mode A single reading is taken for each valid trigger edge This will continue indefinitely if unbuffered If buffered it will continue until NBuf is reached External Windowed BNC BNC n a Acquisition will start when a valid trigger edge is seen after you send Initiate They continue until either NBst is reached or the opposite polarity edge is seen at which point the acquisitions pause They resume when the next trigger edge is seen In unbuffered mode this continues indefinitely In buffered mode it continues until NBuf is reached 15 3 3 Trigger response time The 1128 is always integrating the incoming signal even if the data is not being recorded otherwise charge can build up in cables and give incorrect readings Thus there is some small variation in the time between a trigger edge at the gate input and the start of the first r
87. he I128 can control slave devices such as the M10 general purpose I O unit This can be used to form a control loop where some remote device is adjusted in response to the signals measured by the I128 A trigger input to the gate connector allows measurements to be synchronized to an external event such as a beam present signal Hardware interlock signals generated by the 1128 potential free contacts or 24 V logic are routed directly to one or more beam abort systems The decisions to open these interlocks are made by the 1128 for example by comparing beam position shape or current to target values or as a result of internal errors The 1128 can generate an output monitor unit pulse each time it measures a defined increment of charge which may be used to drive an independent counter or sounder 1128 User Manual 1128 UM 141014 Page 24 of 121 PSI System Controls and Diagnostics lonization chamber to slave device m O p MU out Gate in H LAN B eo HV out in Figure 4 Schematic example basic 1128 installation It is often the case that redundant ion chambers are required in a system for safety Thus we may need multiple I128 units For example if you have two chambers each with 128 strips in each position sensing axis and an integral plane such as the IC128 25 chamber then you would require a total of four I128s to read them out as shown in figure 5
88. ibration The 1128 is designed to produce very accurate current readings The automated internal calibration process measures the background offset and the response to one of two very accurately known internal current sources Multiple readings are taken and averaged with an integration period that nulls any 50 or 60 Hz noise You should not have any connection to the inputs when doing a calibration The resulting linear gain and offset values for each channel and each range are stored in non volatile memory The calibration process does rely on the stability and absolute accuracy of the internal sources These use high precision resistors with very small temperature coefficients It is of course inherently impossible to detect any error in the internal sources by simply measuring with the I128 them after completing a calibration You need to use an independent external source which must itself have very good accuracy and stability If your 1128 is used for critical measurements where absolute accuracy is important we recommend that you make such an external check once per year or more frequently if local procedures dictate 20 2 Other calibrations The calibrations of the analog inputs and outputs and the high voltage setpoint are factory set and should be left unchanged If they do need to be corrected the process is similar to sensor calibration You will require an accurate voltmeter with at least 51 2 digit resolution Set the monitor mode
89. ibration tddi datan 50 11 4 6 Jadlet A RR E 51 11 4 7 Properties erroris 53 11 5 SCREEN LAYOUT GRAPHIC DISPLAY ccsesccccsssscccsssscecessnseessssnseceuseseceuausessssaseceusaueecesausessssececeusateseesaness 54 11 5 1 Strip displdy e tet ERU HE HERD ENERO E EEEE pd ET 55 11 5 2 Scope displQy eit i c RR M te ht ede 55 11 5 3 Histogram display esie dut eee RE NA 56 11 5 4 Ono EE 0s 56 11 5 5 Filtering and zero subtraction iae tee e erae tea e reati 57 11 6 DATATOGGING 5 5 eie fee ee teer eee e deret ee ee eere Ho ect ie eee egg 59 12 T1128 CIRCUIT OVERVIEW sicosessvnasstavsssoscsecesstnevesnsscvasessotssvssseutevenccsesssssenssvenseguadsvosesuvenssunnsssceseusesssveusenssesess 60 12 1 PHYSICAL CONFIGURATION 5 eee eet Pe EC Seah e eee ted eer e be e tee a ether ee 60 12 2 FUNCTIONS 5 tette dudas ip oda eodd ite Da Diet nA dae cis 60 12 2 1 Signal current IMPULSA eH aeta ase auae 60 12 2 2 Calibration currentswitching euet tidaui oet ais 62 12 2 3 Analog SIGNALS Led cua bo teet viet oun er Cat toda eere ve e uet Catia deat edet hee en 62 12 2 4 DI SUAV SIONAL S testes d i RT ERU ERI DER RENE TR DNUER ES WERE uaa esee GS 62 12 2 5 High voltage use aa 63 12 2 6 Tnterl OCR mc 63 12 2 7 AGO M ie 63 12 2 8 Secondary FPGA coincidiendo do e E ERI He ERE e ed 63 12 2 9 Power supplies Savia e e e e ee
90. ics A hardware trigger signal routes to all the I128s via the gate in gate out connectors A system hardware interlock signal such as a 20 mA current loop or 24 VDC logic signal passes through all the I128s Two further relays are available in each I128 which can be used for different system interlock levels not illustrated in the example A synchronization message which can be initiated by the first I128 as shown or received from another controller such as an A560 is used to ensure that all the I128s are coordinated in map execution All the I128s connect to a local area network and they receive maps from and deliver data to the relevant servers on the network Each 1128 has inputs for environmental sensors that measure the ionization chamber conditions and thus it can perform real time correction for temperature and pressure or it can tag the measured signals with these values Other features that could be used in such a system some shown earlier in figure 4 include monitor unit signal outputs additional interlock loops to allow various levels of shutdown response control of remote devices via fiber optic and pneumatic actuator control 9 3 2 Cables The 1128 measures small signals down to below 1 nA Cable quality is vital to obtaining good noise performance Well made screened cables are essential for the current inputs and you should try to minimize the length while being mindful to remove the I128 from any areas with a high
91. ing The algorithm fits a Gaussian curve to the data based on the channel with the highest signal For speed the calculation converts the data to a polynomial then performs a weighted regression fit using matrix inversion The fit constants are then converted back to the three defining parameters for a Gaussian curve the mean peak position sigma width and amplitude height If the peak in the data deviates significantly from Gaussian shape for example by being significantly skewed or if it sits on a pedestal or halo then the fit will not be so reliable A chi squared statistic is used to show how well the fitted Gaussian curve models the data if the data is close to Gaussian then the statistic will be close to 100 The peak shown in figure 53 does not 1128 User Manual 1128 UM 141014 Page 85 of 121 PSI System Controls and Diagnostics have the correct shape so the statistic is relatively low 6896 Nevertheless the position is a good reflection of the peak position and this will be generally true for non skewed peaks The PTC DiagnosticG2 implements the same algorithm on data it receives from the I128 and allows you to adjust the fit settings 1128 User Manual 1128 UM 141014 Page 86 of 121 PSI System Controls and Diagnostics 22 Using the Triangle Generator Test Board It can be useful to inject a signal of approximately known current into multiple channels of the I128 as a simple diagnostic that the
92. installation files and detailed instructions if you wish to run under Linux The remainder of this section assumes a Windows installation Copy the installer file PTCDiagnosticSetup Vx xx msi to the hard drive of the host computer where x xx is the version of the Diagnostic program The host PC must have a standard Ethernet port Run the installer and follow the prompts On Windows 7 systems you will be asked to allow the installer to make changes to the computer after the confirmation stage You will require administrator access to permit this 1128 User Manual 1128 UM 141014 Page 37 of 121 PSI System Controls and Diagnostics rem ooo Welcome to the PTCDiagnosticG2 Setu rd am Technical Consutants inc The installer will guide you through the steps required to install PTCDiagnosticG2 on your computer WARNING This computer program is protected by copyright law and international treaties Unauthorized duplication or distribution of this program or any portion of it may result in severe civil or criminal penalties and will be prosecuted to the maximum extent possible under the law ff PTCDiagnosticG2 i Installing PTCDiagnosticG2 B YR AMID echnical Consutants inc PTCDiagnosticG is being installed Please wait Figure 12 PTC DiagnosticG2 installation Select Installation Folder p YRAMID echnical Consuitants inc The installer will ins
93. ity in the PTC DlagnosticG2 makes the use of DHCP assigned addresses practical Switch Router Figure 64 Network including router You may wish to define the address of this router or some other access point on the network as the default gateway if you want the I128 to be accessible from another network This is optional 27 2 Recovery from unknown IP address There are two ways to restore the I128 to a known IP address 27 2 1 Reset at boot time If you keep the reset button depressed for the first five seconds while the I128 is powering up it will return to its default IP setting which is a static address of 192 168 100 20 1128 User Manual 1128 UM 141014 Page 105 of 121 PSI System Controls and Diagnostics 27 2 2 Using the serial port You can query and set the 1128 network configuration via the serial port This capability will be added in a future firmware update 27 3 System log address The system log address is the IP address of a syslog server that can log status and error messages from the I128 for diagnostic purposes You should leave this set to 0 0 0 0 unless you are doing diagnostic investigations directed by Pyramid Technical Consultants 1128 User Manual 1128 UM 141014 Page 106 of 121 PSI System Controls and Diagnostics 28 ASCII Communication The 1128 includes a serial interface for service and diagnostic work This port is not
94. ize Off Initialize On Enabled Off Enabled On Diagnostic Mode Normal Mode Low Failure High Failure Interlock Off Interlock On Test A Test B Test Sequence Figure 27 Interlock test functions Indicators Fault 1128 is in the fault state Enable In Green when incoming enable line is set opto coupler driven Enabled Command Green when enabled relay is closed CPLD A Error Red when first of the redundant safety interlock CPLDs is in error state CPLD B Error Red when second of the redundant safety interlock CPLDs is in error state Keyswitch Red when front panel keyswitch is in Diagnostic setting green when in Normal setting Mode Red when 1128 is in Diagnostic state green when in Normal state Interlock status Green when interlock safety relay is closed white when open Interlock Command Initialize command has been sent to CPLDs Interlock Uninitialized CPLDs have not been initialized Relay Command Green when auxiliary relay is closed Controls Initialize Off On Initialize the CPLD either leaving the interlock in the open or closed state This must be the first command sent to the CPLD Enabled Off On Clear or set the Enabled relay 1128 User Manual 1128 UM 141014 Page 52 of 121 PSI System Controls and Diagnostics Diagnostic Mode Normal Mode Toggle modes Low Failure High Failure Low failure causes the in
95. l source 9 3 1 Typical setup Figure 4 shows an example installation in schematic form A 64 by 64 strip position sensing ionization chamber includes strip electrodes for reading out the position of a high energy particle beam and an integral plane electrode for measuring the total current The x axis strips are connected to channels 1 64 and the y axis strips to channels 65 128 The integral plane is connected to the channel 0 high current channel HCC input When thinking about the current measurement range you will require you need to include the gain of the ionization chamber the size of the beam and the dimensions of readout electrodes Gain is typically in the range 30 to 200 for high energy ions which pass through a parallel plate ionization chamber at normal incidence depending on electrode spacing fill gas pressure and ion species and energy Thus a beam current of 1 nA for example and a chamber gain of 100 would produce a measureable total signal of 100 nA A strip readout electrode where the beam covered around 10 strips full width would give individual strip currents of 20 to 30 of this total thus 20 to 30 nA HV is delivered to the high voltage planes and sampled by an independent loopback cable Environmental sensors such as provided in the IC128 25 ionization chamber are connected to the sensor signals input of the I128 The 1128 delivers data and receives commands from a host computer system over Ethernet In its turn t
96. lay of a square wave test signal is affected by the filtering setting The noise reduces at the expense of time resolution in the inevitable way 1128 User Manual 1128 UM 141014 Page 57 of 121 PSI System Controls and Diagnostics 5e 08 4e 08 Current A N T o 1e 08 Time seconds vj v4 NoAvg v Zero 3 VStrip JA Scope Histogram 7 ll 1000 Samples d 5e 08 4e 08 3e 08 Current A 2 1e 08 0 0 02 0 04 0 06 0 08 Time seconds Y 10 z ie 10xAvg v 2 Zero 143 V Str Scope Histogram 1000 Samples EJ 5e 08 4e 08 Ww bd o Current A E 1e 08 0 0 02 0 04 0 06 0 08 ES Time seconds Y 10 y 100x Avg 7 Zero j 3 VStrip JA scope Histogram 7 1000 Samples la Figure 34 Increasing the low pass filtering of the displayed data You can remove any zero offset present by setting the zero toggle e a AI displayed readings will have the readings at the time you set zero subtracted from them If you are applying the zero correction to a completed acquisition you have already captured then note that this means the final reading will be subtracted from data 1128 User Manual 1128 UM 141014 Page 58 of 121 PSI System Controls and Diagnostics 5e 08 4e 08 gt lt 3e 08 m c 2 5 2e 08 o 1e 08 0 Time seconds NUR vj G hoa Szzero 3 stro X Scope X Hstog
97. ld be synchronized with external events It is best to set a maximum number of samples stop count when working in buffered and triggered modes to keep the data file size under control and to prevent unexpected buffer overflows The rules for start pause and stop are 1128 User Manual 1128 UM 141014 Page 72 of 121 PSI System Controls and Diagnostics Start Acquisition will either start immediately if Start On Initiate Command is selected start when the first trigger edge is detected after an Initiate command if BNC is selected You can choose whether to respond to a rising or falling edge Pause Acquisition will either pause at the end of the individual integration in process when a number of readings equal to the specified Burst Size has been taken pause at the end of the individual integration in process when a trigger edge of opposite polarity to the start trigger is detected not pause if no pause selection is made The resume after pause conditions are the same as the start conditions Stop Acquisition will either stop at the end of the individual integration in process when a number of readings equal to the specified Stop Count has been taken stop at the end of the individual integration in process when a trigger edge of opposite polarity to the start trigger is detected not stop if no stop selection is made The best way to understand the controls is to look at some ex
98. llowing 1 Input A to I V converter input B to ground 2 Inputs A B to I V converter 3 Input A to gated integrator input B to ground 4 Inputs A B to gated integrator input A to ground The I V converter stage provides four alternative full scale currents The gated integrator stage full scale charge is adjusted by controlling the integration period and it may be optionally configured at time of manufacture with a different value of feedback capacitor Larger capacitors give a higher range at the expense of reduced low current sensitivity The output of the input stages is low pass filtered with 3 dB at 35 kHz before being delivered to the ADC 1128 User Manual 1128 UM 141014 Page 61 of 121 PSI System Controls and Diagnostics General I O Actuator control i MMILI Analog Digital VO 3 2 10 24V 4 4 Opto x BFH RFF Cho 45V isol j p i 1 A 1 1 oH i i Ds Gated int A Fiber optic board n Current n switches Current i le source 2 i DON 1 i 1 eg 1 Il i E y 1 ADAS board i a i I Mode and D3 e 1 address ex n 4 A WE i EEE
99. lly on Bell 9 ControkH ControF 127 Features IZ Implicit CR in every LF Features The Home and End keys Window x Window Standard vt 7 Use background colour to erase screen Appearance NIS Appearance The Function keys and keypad Behaviour nable blinking text Behaviour Q ESC n O Linux Xterm R6 Translation Answerback to E Translation gt VT400 vT100 5 sco Selection PuTTY Selection k Colours Colours Application keypad settings ti gt cti putos Line discipline options 7 dd Initial state of cursor keys Local echo p Normal Application Auto Force on Force off Initial state of numeric keypad Local line editing 9 Normal Application Auto Force on Force off Enable extra keyboard features Remote controlled printing AXI Scu sa Compose key rinter to send ANSI printer output to V Contro Attis different from AltGr None printing disabled Cancel Cancel iB ru recono ERR Figure 65 Setup of PuTTY for ASCII serial communication with the 1128 1128 User Manual 1128 UM 141014 Page 107 of 121 PSI System Controls and Diagnostics You can be connected to the I128 via ASCII serial and the PTC DiagnosticG2 via Ethernet at the same time Some behavior may be unusual so this is only recommended for fault finding not routine measurement 1128 User Manual 1128 UM 141014 Page 108 of 121 PSI System Controls and Diagnostics 29 Creating a Host Software Application Pyramid Tech
100. ls for I128 messages Unexpected changes to I128 state Another host is communicating with the I128 Change IP address Use a direct cable connection instead of a network Set up IP addresses and subnet masks to prevent conflicts 1128 User Manual 1128 UM 141014 Page 113 of 121 PSI System Controls and Diagnostics Communications interruptions Other processes on PC host interfering with comms ports Use a dedicated PC with simple configuration and minimum number of processes running Unable to connect on serial port Another program is using the COM port Try to access the required port with a terminal program Choose another port or close down the other program Incorrect port settings Correct the settings Incorrect cable Make up a suitable cable Serial communication not supported by firmware Check firmware version Unexpected behavior Unit is overheating due to failed fan Unit feels warm Fan stopped Return unit for fan replacement Unit is overheating due to airflow blockage Unit feels warm Performance improves when operated on the bench Clear space around the unit and improve airflow Soft radiation events disrupting processor Turn off radiation source Locate 1128 in a place where errors do not occur Device will not boot or communicate Damage to A60 processor Contact Py
101. me values may be lost because of limitations in the communications rate but this is always obvious in any data you take because the readings are individually time stamped Buffered mode uses the internal memory of the I128 to store up to 65535 sets of readings from the 128 electrometer channels the HCC the analog and digital inputs They are transmitted to the host in groups of not more than 100 so that the data you see on the host computer is always relatively recent There is no break in the readings even at the shortest integration times If the integration time is not too small then the buffer can be unloaded to the host fast enough that it will never fill Burst mode subdivides the buffer memory you allocate into smaller bursts of readings Each burst is accumulated in response to an external trigger or when you have reached a specified burst count This mode is useful if you have bursts of high speed data interspersed with periods when there is no useful data for example a pulsed beam accelerator 10 4 Triggering The 1128 can measure in a free running mode or it can wait for an external trigger pulse on its gate input The edges of the trigger signal can be assigned to start pause and end acquisitions The gate input is echoed to the gate output with minimal delay so you can daisy chain units on the synchronization line 10 5 Self testing and calibration The 1128 includes two high precision current sources set to 500 0 nA and
102. meric values are the sums of all the channels in each bank Peak Results from peak fitting by the on board processor This is distinct from calculations that are available from the PTC DiagnosticG2 Parameters for two peaks are displayed so that you can read out two positions if the 1128 is reading out two axes Below the sub tab area are data displays that area always visible on the Data tab The HCC value shows the signal from channel 0 If you check the HCC box HOC another graphic opens to plot this value 1128 User Manual 1128 UM_ 141014 Page 43 of 121 PSI System Controls and Diagnostics 1 PTC Diagnostic 5 a e II f GB Discover U stop system 40 Start System System 4 BM 192 168 100 20 11281 4 loop 1 k M10 3 Initiate loop 2 es A60 Reco Data i128 1 192 168 100 20 Units A Al Chanels Banks Peak Channel Data A Current A o 32 32 05 32 1 32 15 n 32 25 pose Remaining 2030e 06C Time seconds eam Enal v poie vx Noava gt Ezeo 3 KStrg X scope Histogram J 32400 Samples di el 32 05 321 3215 Time seconds NoAw Ezeo 1 KS A scope A Histogram 7 i Calibration Interlocks State Initializing Measuring Last Error Cj E latin Figure 19 HCC graphic displayed The Dose Remaining Target reached and Beam Enabled readouts reflect the function of the 1128 as a primary dose control device Dose Remaining Beam Enabled
103. mp or FGG 0B 304 CLAD52Z solder Pin 4 Pin 2 Pin3 External view on connector solder side of mating plug 1 LV converter input A AGnd I V converter input B Gated integrator input Chassis Kl w e Internal software controlled switches allow the input to be configured as I V converter pin 1 I V converter summing pin 1 and pin 3 Gated integrator pin 3 This input is generally used to read out the integral or dosimetry plane of an ionization chamber 1128 User Manual 1128 UM 141014 Page 91 of 121 PSI System Controls and Diagnostics 24 1 1 Signal inputs strip inputs Four 44 pin high density DSub female Color coded on decal Software channel count is 1 to 128 electrical schematic input count is 0 to 127 Pin 15 Pin 1 Pin 30 Pin 44 mating plug External view on connector solder side of Channels 1 32 BN inputs 00 to 31 1 Ch29 In 28 16 Ch31 In 30 31 Ch 32 In 31 2 Ch28 In 27 17 Ch30 In 29 32 Shield 3 Ch 26 In 25 18 Ch 27 In 26 33 KGnd 4 Ch 24 In 23 19 Ch 25 In 24 34 KGnd 5 Ch 22 In 21 20 Ch 23 In 22 35 KGnd 6 Ch 20 In 19 21 Ch21 In 20 36 KGnd 7 Ch 18 In 17 22 Ch 19 In 18 37 KGnd 8 Ch 16 In 15 23 ICh 17 In 16 38 KGnd 9 Ch 14 dn 13 24 Ch 15 In 14 39 KGnd 10 Ch 12 In 11 25 Ch 13 In
104. n if trigger conditions are satisfied Abort This button terminates any acquisition in progress On the left below the banner there is a graphic display of the data with controls for how the data is plotted below it This is described in section 11 5 below Below the graphic is a message window which reports all the commands issued to the 1128 by the PTC Diagnostic program and the corresponding acknowledgements Generally you can ignore this display but it will be valuable for diagnosis if you have any operating problems On the right there is a screen area which changes according to which display option you select with the option buttons at the bottom 11 4 Screen layout Right hand tabs 11 4 1 Data tab The drop down control at the top allows you to choose the units to display the measured signals for channel 0 and channels 1 128 mA pA nA C pC nc The selection of display units has no effect on the way that data is acquired or logged There are three data sub tabs All channels A numeric display of the data on each channel and check boxes to allow you to suppress the graphic display of any subset of the channels Use the scroll bar to view the higher channels The color codes correspond to the colors of the traces of the strip chart and scope mode graphics Any channel which is highlighted in red is overrange Banks Check boxes allow you to select or de select display of the channels in banks of 32 The nu
105. nical Consultants Inc provides a full application programming interface for the 1128 based upon a C library Full details are available upon request 1128 User Manual 1128 UM 141014 Page 109 of 121 PSI System Controls and Diagnostics 30 Fault finding Symptom Possible Cause Confirmation Solution High noise levels Environmental noise source Try using other integration periods especially 1 line frequency Use low noise anti triboelectric cable Use longest integration period compatible with your required time resolution Not using low noise cable Check noise without cable Remove any source of cable vibration Use low noise anti triboelectric cable Interference from other equipment Bad cable signal cable screens Turn off potential source of interference Check screens If good try interrupting screen at one end of the cable to break ground loop Use good quality cable Investigate your particular situation to find the optimum connections for minimum noise Re route cables away from sources of interference Consider double screening Ground loops or large ground currents creating potential differences Make or break obvious ground paths Use good quality cable Investigate your particular situation to find the optimum connections for minimum noise Re route cables away from sources of interference Consider double screening
106. nput and Mode keyswitch and set the state of the safety relay and the Enabled relay The remaining relay is driven by the A60 processor which can also read the keyswitch state and the CPLD state Interlock chains may be run as current loops using an external current source and the potential free contact pairs or as 24 VDC logic using the fused 24V available on the interlock connectors 12 2 7 A60 The A60 processor board contains a high performance FPGA field programmable gate array Two NIOS processor cores are implemented in the FPGA one handling the real time I128 application running on an embedded Linux version and the other handling Ethernet communications Additional RAM is provided for program execution and data buffering The application processor communicates with the secondary FPGA located on the ADAS daughter board and with other devices on the main board using a serial bus The A60 sets the I V converter range and the input switch configuration for channel 0 The A60 handles communications on the channels on the fiber optic daughter board and on the serial port It reads the various switches and jumpers and sets the rear panel status LEDs It controls the enable line for the high voltage which also drives the front panel indicator LED 12 2 8 Secondary FPGA The secondary FPGA on the ADAS board manages the 128 channel electrometer chip It handles all triggering and timing functions and the monitor output pulse generation
107. nses eese en etn sevi 104 Connection Via E JU C0 RR 105 Network including router RR n 105 Setup of PuTTY for ASCII serial communication with the 1128 eese 107 Ir usiladxsnnciete PX 115 Fan power connector 2 pin Molex eese eee eese esten senten eene tn sensns tuse s seasons tns tn sensns es es sesenta 116 1128 User Manual 1128 UM 141014 Page 7 of 121 PSI System Controls and Diagnostics 3 Safety Information This unit is designed for compliance with harmonized electrical safety standard EN61010 1 2000 It must be used in accordance with its specifications and operating instructions Operators of the unit are expected to be qualified personnel who are aware of electrical safety issues The customer s Responsible Body as defined in the standard must ensure that operators are provided with the appropriate equipment and training The unit is designed to make measurements in Measurement Category I as defined in the standard A CAUTION According to installed options the 1128 can generate high voltages as follows present on the central conductor of the SHV Safe High Voltage output connector or 2000 V DC at 0 5 mA maximum Or or 1000 V DC at 1 0 mA maximum Or or 500 V DC at 2 0 mA maximum The hazardous live voltages on the SHV central conductor are not accessible under the definitions of E
108. nslation to beam current is typically carried out by the host computer system The 1128 can of course by used in any application where a large number of small positive currents must be simultaneously measured The 1128 includes a powerful real time processor which allows it to analyze incoming data as fast as it is gathered Interlock decisions can be made based on these analyses and the condition of integrated relays can be set accordingly The 1128 provides fiber optic communication channels which allow it to control slave devices A complete system can be built up around a single I128 in many cases The fiber optic channels can also communicate peer to peer with other controllers in larger systems The 1128 has design features which make it tolerant of electrically noisy environments but the place of use is otherwise assumed to be clean and sheltered for example a laboratory or light industrial environment The unit may be used stand alone or networked with other devices and integrated into a larger system Users are assumed to be experienced in the general use of precision electronic circuits for sensitive measurements and to be aware of the dangers that can arise in high voltage circuits 7 2 Key Features Single highly integrated and compact device providing all services needed for a position sensitive ionization chamber One hundred and twenty eight fully parallel electrometer channels 1128 User Manual 1128 UM 141014 Page 14 of
109. o lt a sto TU Scope Histogram 883 Samples dx e Ionization Chamber Setup Calibration Interlocks State Idle Measuring Last Error Properties Figure 55 Test pattern from triangle generator board using 5V source If you inject a time varying signal from the function generator you can use it to check time resolved measurements across 32 channels 1128 1 192 168 0 3 Connected Measuring Trigger Hcc Peak 5e 07 Data Rate Integration Time 1000 ys Conv Sample 1 se ENT High Voltage m o v NN 3e 07 Max 1000 V High Limit 1V gt LowLimit OV gt s E Analogs s Averaging Period 1667e01 vs 2e 07 Offset Subtraction Zero JOL ecex 1e 07 E Save Configuration Data Data Analysis Ionization Chamber 0 25 0 3 0 35 s i v10 vE Noava Ezero a strio X Scope X Fistogram 7 1000 Samples dhe ied Calibration Interlocks State Idle Last Error a z Properties Figure 56 Time varying signal injected to BNC input of test board 1128 User Manual 1128 UM 141014 Page 88 of 121 PSI System Controls and Diagnostics 23 Gate connections The 1128 provides a gate input and gate output connection The input is terminated with 2 5 kohm suitable to be driven by a standard TTL source If the incoming gate signal is on a long coaxial transmission line you should use a source able to drive a 50 ohm impedance
110. on but they are most useful when the 1128 is incorporated into an overall system with appropriate host software The Diagnostic uses the same function library that is exposed for users who develop their own host applications and therefore also serves as a debugging aid PTC DiagnosticG2 was introduced to support the G2 range of Pyramid Technical Consultants Inc products which feature embedded Linux processors and built in Ethernet interfaces It is not compatible with the PSI Diagnostic program which supports previous Pyramid products However the PTC Diagnostic G2 program will be extended in the future to add support for all the previous products Your 1128 was shipped with a USB memory stick with the installation files you need We recommend that you copy the files into a directory on your host PC Check the Pyramid Technical Consultants Inc web site at www ptcusa com for the latest versions Note that updates to the Diagnostic G2 program may introduce new features so the screens in the version you are working with may differ from those shown in this user manual 11 1 Installation The program runs under the Microsoft Windows operating system and can be installed from an msi file using the standard Windows utility It has been tested on Windows XP and Windows 7 It also runs under Linux and has been tested with the Ubuntu distribution There is no installer for Linux contact Pyramid Technical Consultants Inc to get the latest suite of
111. optic loop address rear panel Push button processor reset rear panel Indicators Power on illuminated logo front panel Eight green status LEDs rear panel Power input Voltage 24 VDC 2 V Current 380 mA typical 750 mA maximum Case Format and materials 1U 19 250 mm deep rack mounting steel chassis with Al alloy front panel and polycarbonate decals Fan cooled Protection rating The case is designed to rating IP43 protected against solid objects greater than 1mm in size protected against spraying water Weight 3 5 kg 7 7 1b Dimensions see figures 1 and 2 Environment Operating 10 to 35 C 20 to 30 C recommended 7096 humidity non condensing vibration 0 1g all axes 1 to 1000Hz Shipping and storage 10 to 50C lt 80 humidity non condensing 1128 User Manual 1128 UM 141014 Page 19 of 121 PSI System Controls and Diagnostics vibration 2 g all axes 1 to 1000 Hz 1128 User Manual 1128 UM 141014 Page 20 of 121 PSI System Controls and Diagnostics l V AMPLIFIER INPUT LEMO OVERRIDE ON LED CHANNELS 1 32 HD44 NO e TUN idus ewes 65 96 D Ad X KEXEOWITON N j CHANNELS 97 128 HV IN SHV re 43 7 1U o ab L HV ON LED 482 6 19 FRONT COMMS SELECTOR RS 485 232
112. opyright c 2009 Microsoft Corporation All rights reserved C Users John gt ping 192 168 100 20 Pinging 192 168 100 20 with 32 bytes of data Reply from 192 168 100 20 bytes 32 time lt 1ms TTL 64 Reply from 192 168 100 20 bytes 32 time 1ms TTL 64 Reply from 192 168 100 20 bytes 32 time lt ims TTL 64 Reply from 192 168 100 20 bytes 32 time lt 1ms TTL 64 Ping statistics for 192 168 100 20 Packets Sent 4 Received 4 Lost 0 0 loss Approximate round trip times in milli seconds Minimum Oms Maximum Oms Average C Users John gt x Figure 15 Ping test of the Ethernet connection The Windows firewall may block communication with the I128 It is simplest to start by turning off the firewall while you are testing To maintain security you can disable any wireless adaptor on the PC while you are doing this Once you have established communication then you can try restoring the firewall if needed and set up permissions for the PTC Diagnostic and the 1128 RPC port 111 to communicate through the firewall 6 Start the PTCDiagnosticG2 software It will start with the Discover Devices dialog open Click on Discover Controllers and the software will search all IP addresses within its available network looking for compatible Pyramid devices 1128 User Manual 1128 UM 141014 Page 40 of 121 PSI System Controls and Diagnostics 4 PTC Diagnostic Discover Devi MES Bramo
113. ore complex triggering requirements the Custom trigger controls allow you to define in detail the conditions for starting stopping and pausing acquisitions Setup Measuring Trigger HCC Buffer Contiguous Data Mode Internal v O Initiate Command Start On C Burst Size Unlimited Pause On Stop Count Unlimited Stop On Figure 23 Setup Trigger sub tab The simplest trigger mode is Internal with no buffering Once you click Initiate the 1128 acquires data at the rate determined on the Measuring sub tab and streams it to the host 1128 User Manual 1128 UM 141014 Page 48 of 121 PSI System Controls and Diagnostics computer in real time If the data rate exceeds the communication rate typically this occurs around 20 Hz but it depends in detail on the speed of the computer and network traffic then there will be missing points in the record Using the I128 on board data buffer by checking Buffer Contiguous Data allows this rate limitation to be removed up to file size limits that are imposed by available memory See section 15 for full details of triggering and buffering 11 4 4 3 HCC sub tab The HCC sub tab is where you control the dose input channel send an enable beam signal to an accelerator control and set up a dose target The gated integrator mode will be supported in a future software release the controls in the current software relate to the I V converter mode for dose measurement Setup
114. ould be minimized for optimum signal to noise ratio but you should also attempt to keep the I128 out of known high radiation zones close to a beamline For best performance we recommend a maximum cable run of 10 metres and the use of low noise cable The mounting position should allow sufficient access to connectors and cable bend radii 60 mm minimum clearance is recommended at front and back of the device Best performance will be achieved if the 1128 is in a temperature controlled environment No forced air cooling is required in addition to the unit s built in fan but free convection should be allowed around the back and sides of the case 9 2 Grounding and power supply A secure connection should be made using a ring lug from the M3 ground lug to local chassis potential This is the return path for any high voltage discharge passing via the I128 24 VDC power should be provided from a suitably rated power supply with the following minimum performance Output voltage 24 0 5 VDC Output current 1000 mA minimum 3000 mA maximum Ripple and noise lt 100 mV pk pk 1 Hz to 1 MHz Line regulation 240 mV The 1128 includes an internal automatically re setting PTC fuse rated at 1 1 A However the external supply should in no circumstances be rated higher than the connector limit of 5 A 1128 User Manual 1128 UM 141014 Page 23 of 121 PSI System Controls and Diagnostics 9 3 Connection to signa
115. pc casing transmitter Out In Out Out Out JQ d a Process Enable Status Beam Two loop controller ports plus two individual digital output lines Note the fiber optic ports are mounted on a daughter board which allows other configurations of transmitters and receivers to be installed for particular applications 1128 User Manual 1128 UM 141014 Page 95 of 121 PSI System Controls and Diagnostics 24 2 2 Enable Status port One Weidmuller Omnimate SL 179348000 8 pin connector ph ira ma Y LNLS N Enable Enabled Mode l l Cmd i Status i Key 24 2 3 Interlock port One Weidmuller Omnimate SL 179345000 5 pin connector four pins used Sees 24 2 4 Relay port One Weidmuller Omnimate SL 179344000 4 pin connector al 24 2 5 Power input 24 VDC Two pin Redel PXG M0 2GG NG female To mate with Redel PAG MO 2 type or PFG M0 2 type free plugs Suitably terminated 24 V power supplies and leads are available from Pyramid Technical Consultants Inc 24 2 6 Ground lug M4 threaded stud To mate with M4 ring lug 1128 User Manual 1128 UM 141014 Page 96 of 121 PSI System Controls and Diagnostics 25 Controls and Indicators 25 1 Front panel controls 25 1 1 Key switch Two position switch to select Normal operation mode or Di
116. r It is typically responsive to computed out of tolerance conditions in map execution 1128 User Manual 1128 UM 141014 Page 82 of 121 PSI System Controls and Diagnostics 19 Connecting Slave Devices The 1128 implements a full fiber optic loop controller capability You can connect up to 15 devices and access them via the I128 Ethernet port To use a slave device you simply connect it to one of the two fiber optic ports on the I128 using suitable ST terminated fiber optic cable and run the normal Discover sequence in the PTC DiagnosticG2 The device will be shown as a slave of the I128 and you can open its window and control it in the normal way E PTC Diagnostic 5 ET System 4 19216803 4 loop k M10 2 k M103 loop_2 m 921 zm 19216802 i 281 dose O Stop svstem O start system 1128 1 192168 0 3 es CENUNNENEEEENEES Connected Busy Measuring Error E Initiate Stop jeasurin M10 2 Loop 1 Address 2 MI0 3 Loop 1 Address 3 bins Setup J Calibration Figure 52 1128 with two M10 general purpose I O devices connected as slaves on loop 1 The slave device simply passes its data through the I128 It is not constrained by the I128 s acquisition settings 1128 User Manual 1128 UM 141014 Page 83 of 121 PSI System Controls and Diagnostics 20 Calibration 20 1 Current cal
117. ram 7 pese 5e 08 4e 08 lt 3e 08 a c y 5 2e 08 o 1e 08 0 0 0 02 0 04 0 06 0 08 gt Po A Time seconds Y 10 d B NoAvg v Zero 3 strip X Scope Histogram J 1000 Samples die ed Figure 35 Zero correction of displayed data These display options can be selected independently of the acquisition mode and as mentioned before they do not affect the raw data or the logged data only how it is displayed on the graphic 11 6 Data logging The PTCDiagnosticG2 software has a data buffer which can accumulate up to 100000 samples at which point it wraps around and starts to overwrite the oldest values Accumulation starts automatically when you click Initiate You can capture the contents to a csv format file at any time using the Save button Pressing the Clear button clears the buffer and restarts the logging See section 14 1 for details about the logged data Note that the logged data is the raw data any low pass filtering or zero offset removal does not affect the values you save 1128 User Manual 1128 UM 141014 Page 59 of 121 PSI System Controls and Diagnostics 12 1128 Circuit Overview 12 1 Physical configuration The 1128 circuitry is arranged on four circuit boards main board including HCC channel 0 circuits calibration current sources and routing trigger inputs serial interface HV power supply interlock circuits power supplies ADAS electrometer board the 128 channel el
118. ramid Technical Consultants Inc Failed firmware update Contact Pyramid Technical Consultants Inc Device does not activate interlock when expected Mode switch is in diagnostic setting Check switch setting Only operate in diagnostic mode under carefully controlled conditions remove key at other times 1128 User Manual 1128 UM 141014 Page 114 of 121 PSI System Controls and Diagnostics 31 Maintenance The I128 does not require routine maintenance except to clear any dust accumulation in the fan filter There are no user serviceable parts inside A CAUTION High voltages may be present inside the case Do not open the case when power is applied 31 1 Cooling fan maintenance Tf there is buildup of dust in the filter you should clear this by vacuum cleaning in situ or by removing the filter element and cleaning it separately with an air jet Note that detaching the filter element also detaches the fan from the case Figure 66 Fan filter removal If the fan fails it is necessary to open remove the lid of the case to access the power connector Due to risk of contamination or electrostatic discharge damage we recommend that you consult Pyramid Technical Consultants Inc before attempting this 1128 User Manual 1128 UM 141014 Page 115 of 121 PSI System Controls and Diagnostics To remove the lid of the case remove four M2 5 cross head s
119. rce If you are disposing of the product in the European Union this includes compliance with the Waste Electrical and Electronic Equipment Directive WEEE 2002 96 EC Please contact Pyramid Technical Consultants Inc for instructions when you wish to dispose of the device 1128 User Manual 1128 UM 141014 Page 119 of 121 PSI System Controls and Diagnostics 35 Declaration of Conformity Declaration of Conformity Issued by Pyramid Technical Consultants Inc 1050 Waltham Street Lexington MA 02421 USA The undersigned hereby declares on behalf of Pyramid Technical Consultants Inc that the referenced product conforms to the provisions as listed Refer to the document Extension of testing and analysis to the PTC product line December 10 2007 and its continuations and the 1400 Technical Construction File for detailed testing information Product I128 Ionization Chamber Controller Year of initial manufacture 2012 Applicable Directives 73 23 EEC Low Voltage Directive Laws for electrical equipment within certain voltage limits 89 336 EEC EMC Directive Laws relating to electromagnetic compatibility Applicable Standards TEC 610101 2002 27 Edition UL 61010 1 2004 EN 61326 1997 A1 1998 A2 2001 EN 55011 1998 A2 2002 EN 61000 6 2 2001 Electromagnetic Compatibility Generic Standard Immunity for Industrial Applications Issuing Agencies Safety TUV Rheinland North America 12 Commerce Rd Newtown CT
120. ree point fit become equivalent for practical purposes The Gaussian regression fit algorithm is the one implemented in the 1128 itself using fast FPGA calculations Checking the Display Full Statistics box turns on display of computed values additional to position and width for each of the calculation options 11 4 3 lonization chamber The 1128 is matched to the IC128 25 ionization chamber The ionization chamber tab collects together the signals which are particularly relevant to that application Ionization Chamber Temperature Pressure Humidity Reference Correction HV Integral Plane Strips Sum Peak 1 Position Width 0 Amplitude Confidence gt o o Gain o IC I O Version Figure 21 Ionization chamber tab 1128 User Manual 1128 UM_ 141014 Page 46 of 121 PSI System Controls and Diagnostics Temperature pressure humidity The temperature pressure and humidity values are the readbacks from the sensors in an IC128 25 that allow you to make gain corrections and to monitor the health of the dehumidifier cartridge Reference Future use Correction Future use HV Loopback high voltage monitor Integral plane The HCC signal Strips sum The sum of the 128 channels To first order this should match the HCC value for a chamber with equal electrode gaps Peak 1 Results from the Gaussian fit performed by the 1128 Gain Field where you can enter the
121. sions mm eeeeeeeee esee e esee tns ts ts sns tn sens en sens enses sesenta 21 1128 case plan and side views Dimensions mmm eese esee entente estne tn enean sensns enses ese tn sensns 22 Schematic example basic 1128 installation eee esee esee eene ente etn enean etna tn sens tn senses eese tn saeua 25 Schematic example 1128 installation for dual IC128 25 ionization chambers eee 26 Current return path ionization chamber bias provided by HV module in the I128 28 Current return path ionization chamber bias provided separate HV module 29 Multichannel electrometer input one of 128 identical parallel inputs ch1 to 128 30 HCC integral plane ch0 electrometer input eere esee e entes testen eene tn sensns tns tns tn senses essa saeua 31 High voltage loopback arrangement esee eee eese essen eene eene tn tena tn senses sese ts sensns tns en senses esses etn snue 33 Schematic example 1128 control of remote devices eerie eerte enint entente tenens en etnsnus 35 PTC DiagnosticG2 installation cease esee esee nennen tenentes ens tn stas tn senses tss es sensns tasto senses enean euo 38 Direct Ethernet connection eese eite eese ee eene tentata tasses stas tn con non nonncononnconoro narco noc noo sense essa saeua
122. st also not conflict with any other devices on the same subnet Addresses with last byte 0 and 255 are reserved for special functions in TCP IP Note that if you are communicating with the I128 using Ethernet and you change its IP address then your communication channel immediately becomes invalid You need to rediscover the device if using the PTC DiagnosticG2 or otherwise change your host software setup as needed If you have moved the 1128 into a different subnet for example by setting it to a static address of 192 168 1 20 in the prior example then will also need to the host PC s IP address into the same subnet before you can reconnect The simple static IP arrangement allows you to connect using a direct cable connection as shown in figure 62 or via a network switch as shown in figure 63 A PT ES ETETET Wl de Ga EI Figure 62 Direct Ethernet connection 1128 User Manual 1128 UM 141014 Page 104 of 121 PSI System Controls and Diagnostics Figure 63 Connection via switch Static addressing will also work if the network includes a router but this arrangement also allows dynamic address assignment by the router If your host software expects devices to be at specific addresses this is not appropriate but it can be helpful for initial testing and for fluid setups The router will ensure that there are no address conflicts The Discover util
123. t initially if there is no return path especially if the signal is small as charge can be provided from various stray capacitances but this may fall away or become unstable The currents you are measuring pass along the multiway cable cores to the I128 inputs The current for the operational amplifier action comes from the local circuit ground via the power supply providing the voltage rails for the amplifier devices in the I128 The circuit 1128 User Manual 1128 UM 141014 Page 27 of 121 PSI System Controls and Diagnostics ground is called KGnd for the 128 electrometer channels and AGnd for the separate single channel for integral plane readout KGnd is connected to AGnd and to the case within the I128 In the case of an ionization chamber or similar device where the I128 is providing the bias to an anode from the optional high voltage module the subsequent return path for the current is through the HV module figure 6 to complete the circuit back to the anode F 1128 Ziback on Multiway screened E chamber signal cable gt KGnd A gt m ol A v v Coaxial M ua ead Lot HV cable VN Case e ia Figure 6 Current return path ionization chamber bias provided by HV module in the 1128 If you are using an external high voltage supply then you must ensure that it shares a common ground with the I128 to complete the current path figure 7
124. t up your host PC Ethernet port with a fixed non conflicting IP address in the same subnet range for example 192 168 100 11 Internet Protocol Version 4 TCP IPvA Properties silba x General You can get IP settings assigned automatically if your network supports this capability Otherwise you need to ask your network administrator for the appropriate IP settings gt Obtain an IP address automatically O Use the following IP address IP address 192 168 100 11 Subnet mask 255 255 255 Default gateway Obtain DNS server address automatically 9 Use the following DNS server addresses Preferred DNS server Alternate DNS server _ Validate settings upon exit Advanced mme x Figure 14 Configuring the IP address on the host computer 3 Turn on 24 V DC power to the 1128 but make no other connections The illuminated logo on the front panel should light up and the cooling fan will start up While the device is booting the of four LEDs on the rear panel cycle When the device is ready the Active and power LEDs only should be illuminated 1128 User Manual 1128 UM 141014 Page 39 of 121 PSI System Controls and Diagnostics 4 Make the Ethernet connection from the host PC to the I128 You should see activity on the LEDs that are mounted in the I128 RJ 45 connector Check that you can ping the device from a command window prompt Microsoft Windows Version 6 1 7600 C
125. tall PTCDiagnosticG2 to the following folder To install in this folder click Next To install to a different folder enter it below or click Browse Eolder C Program Files Pyramid Technical Consultants Inc PTCDiagnostic Install PTCDiagnosticG2 for yourself or for anyone who uses this computer Q Everyone Just me Cancel lt Back The installer will create a subdirectory in the Program Files directory containing all the executables and configuration files and create shortcuts on your desktop and in the Start menu 11 2 Connecting to the 1128 The following steps take you through the process of connecting to the device 1 It is simplest to start with a direct connection from your host computer to the I128 using a CAT5 or CAT6 Ethernet cable as shown below The network cable can be a patch or a crossover type the I128 automatically adjusts itself to suit 1128 User Manual 1128 UM 141014 Page 38 of 121 PSI System Controls and Diagnostics A l Ethernet PA Figure 13 Direct Ethernet connection Once you have established reliable communication and set a suitable unique IP address then you can move the 1128 onto a general local area network and work under DHCP address assignment 1f required 2 The device is set with IP address 192 168 100 20 at shipment Once you have a connection you can change this setting as required Se
126. ted to higher signal currents from about 1 nA up to 1 mA and to continuous signals with time variability that you need to capture It reads continuously with no need to reset Reset control oe e Integrator ec m Crack l V converter Figure 9 HCC integral plane ch0 electrometer input 1128 User Manual 1128 UM 141014 Page 31 of 121 PSI System Controls and Diagnostics Signals on the two input pins of the front panel connector can be routed to the required circuit only one mode can be in use at one time You can also cause the two input pins to be connected together This is used if you have two signals which sometimes need to be summed for example a current density pad in the middle of an integral plane electrode The I V converter section provides four current ranges full scale 1 uA 5 uA 10 uA and 20 uA as standard 10 3 Acquisition modes The 1128 can generate data very quickly often at a rate higher than can be accepted in real time by either the communications link or the host computer The 1128 therefore provides buffering schemes that allow you to capture blocks of data at any rate for later transfer to the host computer Unbuffered mode does not store any results in the I128 The values are simply transmitted to the host computer as fast as the I128 can send them and as fast as the host it can accept them At the shortest integration times so
127. terlock to open when triggered only when operating in normal mode High failure causes the interlock to open in either mode Interlock Off On Open or close the interlock safety relay Test A Test B Test A causes only CPLD A to command the interlock safety relay open Test B causes only CPLD B to command the interlock safety relay open This allows you to confirm that either of the redundant CPLDs can Test Sequence reserved 11 4 7 Properties 11 4 7 1 Firmware The Firmware section of Properties tab is where you can see the firmware versions you have loaded There are four files operating system A60 realtime application A60 FPGA and ADAS secondary FPGA Firmware Update All Firmware Firmware Version 0 7 17 53 OS Firmware 0 3 4 2 Thu Oct 11 17 45 09 2012 Realtime Application 0 2 9 7 Fri Oct 26 21 08 47 2012 FPGA 0 1 1 26 Secondary FPGA 0 1 3 18 Hardware Revision 0 Figure 28 Firmware versions The individual firmware releases are combined as a compatible set into an overall firmware version You can update the suite of versions when necessary The update is carried out via the Ethernet interface there is no need to open up the device 11 4 7 2 Communications The Communication section of Properties tab is where you can see the Ethernet communication settings and change them as needed Communications Configure IP Addess 192 168 100 68 Mode Static IPv4 MAC 0
128. the integrator You can only use the gated integrator mode when the selected integration time exceeds the sum of the times that form the reset sequence setup reset and settle times which is typically about 50 usec The time to generate each reading of 128 1 signals that you see is the product of the integration time and the conversions per sample that are averaged by the on board FPGA The maximum Conv Sample value is 255 so the longest accumulation for a single reading is 1000 usec x 255 0 255 seconds or a data rate of 4 Hz At the other extreme the highest data rate of 18 2 kHz is obtained using 55 usec x 1 2 55 usec As you alter these values the read backs below show the resulting full scale current full scale charge and sample rate based on the configuration of the ADAS electrometer chip that produced the desired settings The HV controls allow you to set the voltage enable or disable the supply and define alarm limits for the monitored high voltage If you have a negative HV module installed then you must enter negative numbers The maximum voltage available from the installed HV module is displayed as determined by jumper settings in the I128 11 4 4 2 Trigger sub tab The Trigger sub tab is where you set up the trigger conditions There are various trigger modes available The most useful are the basic Internal triggering without buffering which will always show you a real time response on the PSI DiagnosticG2 display For m
129. up 2 5e 07 Measuring Trigger HCC Peak B coffer Contin Data Mode Custom X Initiate Command 2e 07 Start On e nc Burst Size Pause On Bnc Lo 15e 07 z Y Stop Count 10000 t Stop On BNC 5 o 1e 07 5e 08 0 0 975 0 98 0 985 0 99 0 995 4 v so ju eme gt 10 07 8e 08 68 08 Current A El save Configuration 0 975 0 98 0 985 0 99 0 995 E Data Data Analysis f Tanizatinn Chamber Figure 43 Time varying signal seen in custom buffered mode 1128 User Manual 1128 UM 141014 Page 74 of 121 PSI System Controls and Diagnostics Now let s say you are only interested in the first 5 msec of data in each cycle With the 5096 trigger duty cycle shown in figure 41 you could select a pause on BNC However if you set a burst size of 50 you will achieve the same but you will also be able to see a stable scope mode display in the PTC DiagnosticG2 that refreshes for each pulse The total acquisition time will now be twice as long because the 10000 total buffer you defined is consumed at half the rate If you inspect the logged data as a function of the time stamps you will see the bursts of contiguous data separated by gaps when the 1128 was waiting for the next trigger to resume Clearly if triggers are infrequent and the signal has short duration this is a very effective way of collecting data Ea Connected Busy Measuring Error MAn Initiate Stop Measuring
130. ure 53 Figure 54 Figure 55 Figure 56 Figure 57 Figure 58 Figure 59 Figure 60 Figure 61 Figure 62 Figure 63 Figure 64 Figure 65 Figure 66 Figure 67 1128 with two M10 general purpose I O devices connected as slaves on loop 1 83 1128 real time peak fitting eee eee eee esee eese eese entes en etas tn sensns enses sese tn sensn sensns enses otes inesse 85 Triangle generator test board eee ee e eee eee ee eese enses testes enses enata essen sensns tasto senses senes suus 87 Test pattern from triangle generator board using 5V source eere eese eee eene tenen enensnus 88 Time varying signal injected to BNC input of test board eese eee eee eee esten eene tnnnue 88 Alternative methods for long distance trigger delivery 50 ohm line top fiber optic bottom 89 Gate passthrough latency gate in yellow gate out blue c eese eese e esee eee eene ee eere eene tnaen 89 Interrogating the 1128 via a web browser eeeeeeee eese esee tenentes tns tse tn sens en sensns tus es sensn enn 101 RS 232 cable 1128 to uo 101 RS 485 cable 1128 to TC100 eeeeeee eese esee esee tees teta ENANA tata stats tns ENAR sta ERARE estas ARAE 102 Direct Ethernet connection eerie esee eese e esent nsns tassa sins tn cnn non stas esses senes sensns e
131. useful for taking data from the I128 due to the Future firmware versions will add features such as serial number and firmware version interrogation and the ability to query and set the Ethernet configuration The feature will use ASCII commands that can be sent from a standard terminal host application 28 1 Using PuTTY to test the serial ASCII connection Microsoft Windows no longer includes a terminal emulator that you can use to test the ASCII communications Hyperterminal may be transferred from an unused prior Windows version by copying the files hypertrm exe and hypertrm dll Various public domain programs are also available to perform this task Pyramid has tested PuTTY and Realterm with G2 devices The following screenshots show the configuration of PuTTY with 115kbps baud rate Bini nots Category Zi Session Logging amp Terminal Keyboard Bell Features Window Appearance Behaviour Parity Translation Selection Colours Connection Serial Options controlling local serial lines Configure the serial line Speed baud 115200 Data bits Stop bits Elow control Category Category Session Options controlling the terminal emulation E Session Options controlling the effects of keys m ad Setvarious terminal options eee Change the sequences sentby Keyboard V Auto wrap mode initially on T The Backspace key E Bell DEC Origin Mode initia
132. ut and output signals are processed by the redundant CPLDs in the 1128 In addition another contact pair is brought to this connector directly from the front panel keyswitch so that a remote system can detect if the 1128 has been placed in diagnostic mode The enable input opto isolator input requires a minimum of 1 mA to switch with 1 5 V forward bias and has a 2 5 kohm series resistor It will respond to typical CMOS TTL compatible outputs for example and is also compatible with 24 VDC logic 1128 User Manual 1128 UM 141014 Page 81 of 121 PSI System Controls and Diagnostics 18 2 2 Interlock 5 pope pS l l l 24V ILK n c Figure 50 Interlock interface Weidmuller Omnimate SL 179345000 5 pin connector The relay is a safety rated type SR4D4005 with force guided contacts according to EN 50205 The minimum wetting current and voltage for the contacts is 10 mA 5 V One n o contact pair is brought to the connector and a second pair is read by the I128 A60 to confirm operation The relay is controlled by the redundant CPLDs and is typically used for major failures such as processor watch dog timeouts or loss of power 18 2 3 Relay rA LN L o o o o l l l 24V Relay L Figure 51 Relay interface Weidmuller Omnimate SL 179344000 4 pin connector The relay is a standard type and is controlled by the A60 processo
133. voltage The voltage is applied through one and sampled through the other The I128 measures the sampled voltage If it is present at the correct level you can be almost certain that the bias voltage is being delivered 1128 HV supply Sample HV out lonization chamber anode ADC Sample HV return Figure 10 High voltage loopback arrangement 10 7 General purpose I O ionization chamber services The general purpose I O connector provides digital and analog inputs and outputs available for any purposes Typical use is to read out environmental sensors that monitor the pressure and temperature of an ion chamber fill gas The 1128 can use this data to compensate changes in chamber gain due to environmental changes 1128 User Manual 1128 UM 141014 Page 33 of 121 PSI System Controls and Diagnostics 10 8 General purpose I O actuator control Ionization chambers are sometime mounted on motion actuators to position them in or out of a beam path The I128 includes a pneumatic actuator control port with a switched 24 VDC line to control a solenoid valve and opto isolated inputs for reading back end of travel limit switches These I O points can of course be used for general purposes also 10 9 Map execution and interlocking The 1128 includes features that support the concept of dose maps such as radiation therapy treatment maps The on board processors can receiv

Ionization Chamber Controller User Manual

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