J0502011 9-Channel Pulser System User Manual
Contents
1.2. 500 4 2 He Monitor 500 4 499 4 Ear Monitor 499 3 502 4 499 3 500 4 pos Me Monitor 500 3 500 4 500 4 502 4 po Monitor 500 73 499 4 500 4 501 4 o M Monitor 500 3 01 9 9 01 00 00 99 02 99 01 99 01 00 02 99 00 00 02 99 Bias Supply voltages into 1OMQ 203 103 25 199 98 24 203 103 23 199 99 22 202 103 24 199 98 23 201 102 22 198 98 22 202 102 24 98 98 23 202 102 27 198 98 26 202 103 24 198 98 23 201 102 25 98 99 24 202 102 19 98 98 19 Programmed Voltage V a 03 99 03 98 02 97 03 98 02 97 03 98 03 98 02 97 2 2 2 2 2 2 2 2 2 9 Channel Pulser System or Programmed Voltage Sd channel Source 500 400 300 20 100 o 100 200 300 paor o 302 299 303 300 al 302 299 303 299 x 302 299 1 302 300 303 299 302 299 l 302 299 1 04 299 400 499 199 301 399 499 04 299 401 500 199 301 399 499 04 299 401 501 198 300 399 500 02 300 398 498 198 299 399 499 04 299 400 500 198 300 399 500 04 301 399 499 198 300 399 499 04 301 400 500 199 299 399 500 04 301 400 500 199 300 399 500 02 298 399 498 197 300 399 499 Actual Monitor I Monitor Actual Monitor I Monitor Actual Monitor Monitor Actual Monitor I Monitor Channel Vv Vv 1 491 499 2 492 500 3 490 500 4 493 499 5 492 499 6 492 500 7 493 500 uA 49 49 149
3. Name Explanation Format parameter 1 parameter 2 returned value Name Explanation Format parameter 1 parameter 2 returned value Kentech Instruments Ltd 9 Channel Pulser System vbias read desired value for bias voltage n vb n channel number 0 thru 8 none desired value in volts gt vbias read absolute measured value for bias voltage n gt vb n channel number 0 thru 8 none measured value in volts gt ibias read absolute measured value for bias current n gt ib n channel number 0 thru 8 none measured value in uA litrip write desired absolute value for bias current trip x n it x current in uA range 0 to 20 n channel number 0 thru 8 none itrip read desired absolute value for phosphor current trip n it n channel number 0 thru 8 none current in uA range 0 to 20 tripstatus read bias trip status tp s none none pulser status biasstatus read bias user enable status Rb none none pulser status Page 25 of 28 July 2005 Name Explanation Format parameter 1 parameter 2 returned value Name Explanation Format parameter 1 parameter 2 returned value b trigger outputs Name Explanation Format parameter 1 parameter 2 returned value Name Explanation Format parameter 1 parameter 2 returned value Name Explanation Format parameter 1 parameter 2 returned value c delays Name Explanation Format parameter 1 parameter 2 ret
4. pulse is generated and split into each of the nine channels These 500V pulses propergate in parallel through the nine programmable delay channels and are finally combined with the programmable bias voltages at the HV trigger output SHV connectors An EEPROM Write Enable button has been fitted to the rear of the MCU This button should be used only when reprograming the calibration data Contact Kentech Instruments for more information The MCU contains nine separate bias generators which can be individually programmed to give different bias settings on each channel A single current limit can be set for all the channels If the bias current on any channel exceeds this limit the bias will be disabled Each channel has its own programmable delay generator The user may delay each output pulse by up to 50ns with a resolution of approximately 25ps 4 2 CPS3 M1 pulse generators The CPS3 M1 pulse generators produce gt 6kV negative unshaped pulse with a rise time of approximately 100ps The Pulse Forming Modules PFMs shape the output waveform to produce a gt 3kV negative pulse with a length of approximately 500ps Kentech Instruments Ltd Page 8 of 28 July 2005 9 Channel Pulser System CPS3 M1 High voltage pulse generator MCP bias 500V Made in Englandby Kentech Instruments Ltd www kentech co uk PFM e 9 O Power Triggered A Trig amp output Timing monitor I N Low level High level Ext monitor HV pulse output t
5. 50 149 50 50 9 v 799 9 100 100 99 100 99 100 v uA v 98 9 99 8 98 10 100 98 10 100 97 10 98 97 39 99 97 10 99 98 10 100 Vv 97 98 100 97 97 97 97 uA 10 10 9 9 v v 487 499 487 499 488 500 485 499 487 500 486 500 487 500 uA 49 48 49 49 49 49 49 8 491 500 4 99 97 10 99 98 487 500 49 9 492 499 49 Kentech Instruments Ltd 99 97 10 99 Page 19 of 28 9 9 9 9 485 500 49 July 2005 9 Channel Pulser System 8 CPS3x9 Control Unit RS232 interface 1 07 05 8 1 General Notes 1 If trip or interlock latches are set the control unit will ignore attempts to enable the bias supplies Therefore the trip or interlock latches should be reset before attempting to enable supplies 2 The MCU behaviour on interlock fail is determined by a flag in eeprom called safeoninter Interlock fail always causes the bias supplies to be disabled If safeoninter is high the trigger outputs will also be disabled equivalent to executing a safe command If safeoninter is low the trigger outputs are not affected It is possible to modify the state of this flag but not using the normal protocol 3 The software refers to channel numbers as 0 thru 8 as opposed to the natural user description 1 thru 9 8 2 The protocol The MCU uses a restricted protocol for reliable control It is not be possible to download code to the MCU or edit flags and calibrati
6. near square negative pulse Rise time lt 150ps Fall time lt 250ps Flatness of top lt 5 Pulse width 380 400ps near flat top approx 500ps fwhm 3 3 Master Control Unit MCU Specification Nine independent bias supplies Bias voltage range 500 to 500V Bias voltage monitor tolerance 1 with 1GQ load 5 with 10MQ load Maximum bias current 50uA Bias current monitor tolerance 1 Nine independent current trips Bias trip current tolerance SpA Nine independent delay generators Maximum delay 50ns Delay resolution 25ps RS232 settings 9600 baud Connectors amp Interface Low level trigger input BNC RS232 port 9 way socket Maximum rep rate Kentech Instruments Ltd Interlock connector LEMO coaxial 9 x HV trigger and bias outputs SHV Mains Power IEC rear panel 10Hz Page 6 of 28 July 2005 9 Channel Pulser System Power supply 110 240V AC 50 60Hz lt 20W Size 19 wide x 3U tall x 400mm deep Indication Power led Trig led 3 4 System Specification Jitter between outputs lt 20ps rms Power consumption lt 250W 3 5 Control Interface 1 x Labview driver virtual instrument for Master Control Unit Commands include write desired value for channel n bias voltage read back desired value for channel n bias voltage read measured value from ADC for channel n bias voltage read measured value from ADC for channel n bias current set bias current trip level read back trip status enable all bias
7. 6 as above but with an invalid parameter 9 gt vb and the response would be 9 gt vb param Bias Trip status bits Default to zero on reset power up These bits are reset by tripreset command This register is intended to allow identification of source channel of trip b0 bias 0 tripped ro 1 tripped on this channel bl bias tripped ro 1 tripped on this channel b2 bias 2 tripped ro 1 tripped on this channel b3 bias 3 tripped ro 1 tripped on this channel b4 bias 4 tripped ro 1 tripped on this channel b5 bias 5 tripped ro 1 tripped on this channel b6 bias 6 tripped ro 1 tripped on this channel b7 bias 7 tripped ro 1 tripped on this channel b8 bias 8 tripped ro 1 tripped on this channel b9 not used b10 not used bll not used b12 not used b13 not used bl4 not used Bias User Enable status bits Default to zero on reset power up These are all reset by interlock fail or a trip condition After reseting interlock or trip you need to reload these These bits can only be set if the trip and interlock latches are zero b0 ias 0 enable rw 1 enable bl bias 1 enable rw 1 enable b2 ias 2 enable rw 1 enable b3 ias 3 enable rw 1 enable b4 bias 4 enable rw 1 enable b5 bias 5 enable rw 1 enable Kentech Instruments Ltd Page 22 of 28 9 Channel Pulser System July 2005 9 Channel Pulser System b6 bias 6 e
8. Notes on the use of Kentech Instruments Ltd 9 Channel Pulser System Serial number J0502011 26th July 2005 Kentech Instruments Ltd Unit 9 Hall Farm Workshops South Moreton Oxon OX11 9AG UK UK Tel 01235 510748 UK Fax 01235 510722 VAT Registration number GB394526620 Int Tel 44 1235 510748 Registered in England No 1742794 Int Fax 44 1235 510722 Registered office 6a 1st Floor Popin Business Ctr South Way Wembley London HA9 OHF UK Email anyone kentech co uk Directors P A Kellett B A Oxon A K L Dymoke Bradshaw PhD J D Hares PhD Web http www kentech co uk 9 Channel Pulser System i Caution 9 Channel Pulser System serial number J0502011 This equipment is a research tool that has been intentionally designed to generate high energy electromagnetic pulses and the EM emissions will be highly sensitive to the load applied by the user Within the EU it is suitable for use only in a sealed electromagnetic environment unless it is used in a system that has been verified by the system builder to comply with EU directive 89 336 EEC With an appropriate load and adequately insulated connecting leads the unit is safe for use by an educated user in a laboratory environment You are warned however that the radiation from the system with an antenna or inappropriate load attached can damage sensitive equipment and corrupt data stored in computer and microprocessor based systems It can cause terminal failure of vital med
9. as detected an out of range parameter After any error the command is not executed the stack is cleared and no values are returned other than the error code Following a stack error the stack is cleared then dummy parameters generally 1 or 65536 are added for the purpose of formatting the response only Kentech Instruments Ltd Page 20 of 28 July 2005 9 Channel Pulser System All status commands expect and deliver data as decimal numbers and all numeric data should be decimal no decimal points or other punctuation to be used For example 1 to set the desired value of coarse delay to Sns on channel 3 the command would be 5000 3 d and the response if the command can be completed would be 5000 3 d 2 as above but with a missing parameter 3 ld and the response would be 1 1 d stack The command interpreter detects the wrong stack depth corrects this by clearing the stack and adding some dummy parameters then flags the error No execution will result 3 as above with invalid parameter 5000 9 d and the response would be 5000 9 d param Again no execution will result 4 to read the measure value of bias voltage 2 2 gt vb and the response if the command can be completed would be 2 gt vb 100 which implies the voltage is 100V 5 as above but with a missing parameter gt vb Kentech Instruments Ltd Page 21 of 28 July 2005 and the response would be 1 gt vb stack
10. ay of the output signal to the pulser in relation to the trigger signal Update button will send the commands to the intrument all 9 chanels are being updated Whenever you change one of the settings in any of the controls the Update button will flash Safe button will switch off all the Biases and Trigger enable signals Save default status will save the present settings of all the channels and Itrip setting in the default config file eps9 cfg When the program starts it restores all the setting from cps9 cfg file You can save the present settings in a different config file by pressing Save status to file and restore the settings from the saved file by pressing Restore status from the file Stop program to stop running the program To communicate with the instrument you will have to set the right COM port in the Visa resource name combox The port setting will be remembered when you stop the program Next time you run the program it will restore the port settings from the default config file Each button can be operated by a Hot Key as indicated on each button see figure above Kentech Instruments Ltd Page 12 of 28 July 2005 9 Channel Pulser System 6 Output Waveforms Output pulse brown trace 500V div Timing monitor green trace 5V div All traces Ins div Figure 7 J0502011 CPS3 1 Figure 8 J0502011 CPS3 2 Kentech Instruments Ltd Page 13 o
11. e 3 of 28 July 2005 9 Channel Pulser System 1 Introduction Our range of solid state high voltage pulse sources allows very high voltage fast rising pulses to be obtained from compact bench top units Our avalanche technology allows the generation of 10kV voltage pulses rising in 100ps into 50Q Our range of FET pulse generators provides sub nanosecond switching speeds kilovolt amplitudes and repetition rates in excess of 1MHz The performance of our compact convenient and reliable pulsers is to our knowledge exceeded only by laser driven photoconductive switches in terms of voltage switching speeds and versatility These pulsers will find applications in many fields such as high speed camera research electro optic switching triggering systems time of flight mass spectroscopy and radar Kentech Instruments Ltd Page 4 of 28 July 2005 9 Channel Pulser System 2 Description of the 9 Channel Pulser System The Kentech Instruments 9 Channel Pulser System J0502011 is designed to generate 3kV pulses on nine separate outputs each with a programmable delay of up to 50ns and a programmable bias voltage in the range 500V The Pulser System is controlled and monitored via a serial interface The Pulser System consists of nine high voltage pulse generators CPS3 M1 which produce the HV output pulses e one CPS3 Master Control Unit MCU which generates the bias voltages and the delayed HV trigger pulses required by the pulse generator
12. e apropriate COM port in the VISA resource name combox Click Cntl M and select port Click the Run button in the main Labiew menu The VI starts If there is a problem in communcation between the program and the instrument the Comm Error LED will change to red If Comm Error is dim the communication between the program and the instrument is ok 5 2 Using the Control Interface The Control Interface is a set of LEDs buttons switches and edit boxes to help you to send commands and get the status of the system Hle Edit Operate Tools Browse Window Help Trigger latched Trigger reset F4 j VISA resource name fg COMi ea Interlock reset F5 SAFE F3 Comm Error Trip reset F6 7 Update Itrip F7 j Vbias Monitor IbiasMonitor BiasEnable BiasOn Tripped Trigger enable Trigger on Delay uA 1 J Jc Update F1 uA Interlock ok Interlock latched uA Save default status F2 j Save status to file F8 j restore status from file 7F9 STOP PROGRAM F10 j ee al al alll start aeo E avew E Ps3x9_Control_Inte la 12 22PM Figure 6 LabView Control Interface Kentech Instruments Ltd Page 11 of 28 July 2005 9 Channel Pulser System Trigger latched will be ON yellow after the first triggered event and stay on until you press the Trigger reset button Interlock ok will be ON green while
13. f 28 July 2005 9 Channel Pulser System Figure 10 J0502011 CPS3 4 Kentech Instruments Ltd Page 14 of 28 July 2005 9 Channel Pulser System EET LOTUS MEMES ED EER Figure 12 JO502011 CPS3 6 Kentech Instruments Ltd Page 15 of 28 July 2005 9 Channel Pulser System Figure 14 JO502011 CPS3 8 Kentech Instruments Ltd Page 16 of 28 July 2005 9 Channel Pulser System Figure 15 JO502011 CPS3 9 Kentech Instruments Ltd Page 17 of 28 July 2005 9 Channel Pulser System 7 Test Results Test results recorded on 22 July 2005 7 1 Absolute Channel Delays The absolute delay measured from system trigger input to pulse output on channel 1 is approximately 44 6ns The following table shows the delays of the other channels relative to channel 1 Channel delay ps 1 0 59 34 51 20 47 45 76 TI ooN ou fk WD 7 2 Relative Channel Delays The following table shows the delay observed in each channel when programmed with a range of nominal values from 0 to 50ns The delays are measured relative to zero delay for that channel RR oO 2 3 4 5 6 7 8 9 oO OO OO Oo OO OO oO O O G GGGl Sr orao a l e oo O a NN NNN NN N WWWWWW WW Ww Q OLO O GONGL Ol O BPS SP SS AA eA e Kentech Instruments Ltd Page 18 of 28 July 2005 7 3 Bias Supplies Bias Supply voltages into 1GQ 500 a po M Monitor 499 ca
14. ical electronic systems such as pacemakers This equipment is be supplied on the understanding that the user will analyse these risks accept responsibility for them and take appropriate precautions in the use of this instrument The output from this pulse generator will destroy many types of power attenuators and electronic test equipment It is the users responsibility to ensure that any apparatus connected to the output is suitably rated Kentech Instruments Ltd accepts no responsibility for any damage or liabilities incurred in the operation of this equipment Please read the manual before applying power THERE ARE DANGEROUS HIGH VOLTAGES 1kV PRESENT IN THIS PULSER WHEN THE UNIT IS OPERATING DISCONNECT THE POWER SUPPLY BEFORE REMOVING THE COVERS Kentech Instruments Ltd Page 2 of 28 July 2005 9 Channel Pulser System ii Disclaimer This equipment contains high voltage power supplies Careless can result in electric shocks It is assumed that this highly specialised equipment will only be used by qualified personnel Kentech Instruments Ltd accepts no responsibility for any electric shock or injury arising from use or misuse of this product It is the responsibility of the user to exercise care and common sense with this highly versatile equipment The main output can be very dangerous particularly when the pulser is triggered at a high frequency Take great care to insulate the output adequately Kentech Instruments Ltd Pag
15. nable rw 1 enable b7 bias 7 enable rw 1 enable b8 bias 8 enable rw 1 enable b9 not used b10 not used bll not used b12 not used b13 not used bl4 not used Bias Hardware Enable status bits These reflect the state of the enable outputs to the bias power supplies b12 Trigger latch is set by a trigger condition reset by the TriggerReset command b13 Interlock fail latch is set buy the interlock circuit failing reset by InterlockReset command b0 bias 0 on rO 1 0 on off bl bias on rO 1 0 on off b2 bias 2 on rO 1 0 on off b3 bias 3 on rO 1 0 on off b4 bias 4 on rO 1 0 on off b5 bias 5 on rO 1 0 on off b6 bias 6 on rO 1 0 on off b7 bias 7 on rO 1 0 on off b8 bias 8 on rO 1 0 on off b9 not used b10 not used bll not used b12 Trigger latch 1 triggered b13 Interlock fail latch 1 interlock has failed 0 ok bl4 hw enable ro 1 interlock is ok 0 not ok Trigger user enable status bits Default to zero on reset power up These bits are reset by a trip event If the SafeOnInter flag is hi these bits are also reset by an interlock failure After reseting interlock or trip you need to reload these These bits can only be set if the trip latch is zero If the SafeOnInter flag is hi these bits can only be set if the interlock latch is also zero b0 trigger 0 enable rw bl trigger 1 enable rw b2
16. ne none version number InterlockReset Reset interlock latch Oint none none none TripReset Reset trip latch Otrp none none none TriggerReset Reset trig latch Otrg none none none Page 27 of 28 9 Channel Pulser System July 2005 9 Channel Pulser System d New commands added to facilitate Labview driver Name Eplanation Format Parameter 1 Parameter 2 Returned valuel Returned value2 Returned value3 Returned value4 Returned value5 Returned value6 Name Eplanation Format Parameter 1 Parameter 2 Returned valuel Returned value2 Returned value3 Returned value4 Name Eplanation Format Parameter 1 Parameter 2 Parameter 3 Parameter 4 Parameter 5 Returned valuel Name Eplanation Format Parameter 1 Parameter 2 Parameter 3 Parameter 4 Parameter 5 Returned valuel Kentech Instruments Ltd ChannelLook Read all measure parameters for one channel n chl channel number 0 thru 8 none channel no vbias ibias tripped biasen trigen SystemLook Read all measure parameters for system syl none none triplatch triglatch interlock latch interlock cct Channelset Set all parameters for one channel pl p2 p3 p4 p5 chs vbias delay 1 EnableBiase 1 EnableTrigger channel number 0 thru 8 none Systemset Set all parameters for system pl p2 p3 p4 p5 chs itrip 1 TripReset 1 TriggerReset 1 InterlockReset none none Page 28 of 28 July 2005
17. on data using this protocol It is possible to change protocol mode and use the full Forth interpreter which allows all flags and calibration data to be edited or a new version of source code to be downloaded but this is not covered in this document The MCU generates responses to valid commands and does not generate any unsolicited output Invalid commands are ignored All commands and response are in ASCII characters Commands are case sensitive In the interest of simplicity all commands are parsed by the MCU using the Forth interpreter so the parameters need to be delimited by spaces and the command line has to be terminated by carriage return and linefeed characters The Forth interpreter will not recognise any commands other than those defined in the command set The MCU will not echo command characters as they are received no output is generated until a valid command is recognised When a valid command is recognised the MCU outputs a response Responses are preceeded with a cr and If then an ascii character and end with an ascii The response is delimited into fields by an ascii character The first field in the response will be a repeat of the command If the command cannot be completed the MCU will return an error code in the second field The possible error codes are stack the command interpreter has detected a wrong stack depth error ie the wrong number of parameters have been received param the command interpreter h
18. onnector The impedance of the monitoring circuit should be gt 1GQ 4 3 Use of the CPS3 M1 in Stand Alone Operation The CPS3 M1 may be triggered directly from a low voltage signal when not used as part of this pulser system In stand alone operation a HV trigger signal is produced within the pulse generator Kentech Instruments Ltd Page 9 of 28 July 2005 9 Channel Pulser System and is available at the Trig amp output SHV connector This trigger signal must be connected directly to the High level trig bias input SHV connector see Figure 5 If a bias voltage is required at the output it must be generated by external equipment and introduced at the Ext monitor DC bias 500V SHV connector The bias will be combined with the HV output pulse within the PFM CPS3 M1 amp PFM Trigger stack Main stacks JI gt PFM ae Low level Trig amp output High level Timing monitor PFM output Ext monitor trig mhput SHV trig bias input SMA N DC bias 500V BNC SHV SHV Gee NE oa a ca ty kee Pulse output Input p Trigger input l HV output 5V 500 SMA Md i Pulse Generator i Oscilloscope j l User equipment il Bias Generator Figure 5 CPS3 M1 Stand Alone Operation 4 4 The Pulse Forming Modules PFMs The PFM sets the length of the pulse and couples it onto the output N type connector which is held at the bias voltage Although the pulse generat
19. ors produce very similar pulses and the PFMs have similar characteristics it is intended that the pulse generators are matched with specific PFMs For example it is recommended that Channel 1 of the MCU is connected to the pulse generator number J0502011 CPS3 1 using the SHV cable marked 1 and that the PFM J0502011 PFM1 is used with this channel The HV pulses produced by both the MCU and the CPS3 M1 will cause damage to test equipment if precautions are not taken If it is necessary to monitor or characterise the output pulse suitable attenuators should be used We recommend the use of a high voltage high speed attenuator manufactured by Barth as the first attenuator in a series Kentech Instruments Ltd Page 10 of 28 July 2005 9 Channel Pulser System 5 LabView Control Interface Program The 9 Channel Pulser System may be controlled and monitored by means of a LabView virtual instrument Commands may also be transferred directly using any standard terminal program Commands and data are transferred through the RS232 interface Nn 5 1 Starting the Control Interface Program Copy the file called ceps9 cfg to the Labview main directory for example c Program Files National Instruments LabVIEW 7 1 Start Labview Click the Open buttton and open the library file cps3x9_Control_Interface Ilb From the File Dialog choose CPS3x9_Control_Interface_main vi Before running the instrument you will need to select th
20. rig input trig bias input DC bias 500V 6kV 509 Figure 3 CPS3 M1 Front Panel Note these pulse generators must NOT be operated without a Pulse Forming Module Operating without proper termination may damage the equipment As part of the Nine Channel Pulser System each CPS3 M1 pulse generator is triggered by one of the HV trigger output signals from the MCU This signal is fed into the pulse generator s High level trig bias input SHV connector see Figure 4 Within the pulse generator the high voltage trigger signal is stripped away from the bias and used to excite the avalanche transistor stacks to produce a 3kV output pulse This output pulse is then recombined with the bias within the Pulse Forming Module CPS3 M1 amp PFM Trigger stack Main stacks li Ie gt o PFM Low level Trig amp output High level Timing monitor PFM output Ext monitor trig input SHV trig bias input SMA N DC bias 500V BNC SHV SHV E O HV rine on fut m input HV V input MCU 5 Oscilloscope i User equipment Voltmeter Figure 4 CPS3 M1 Pulser System Operation The user may monitor the timing and amplitude of the output pulse by observing the Timing monitor SMA output The output signal at this point is approximately 5V into 50Q for a 3kV output pulse The bias voltage may also be monitored at the Ext monitor DC bias 500V SHV c
21. s nine Pulse Forming Modules PFM which shape the pulse as required by the user RF and power cables e LabView control interface software to control the Pulser System CPS3 Master Control Unit Made in England by Kentech Instruments Ltd www kentech co uk Trigger input 5V 50ohms Figure 1 9 Channel Pulser System Kentech Instruments Ltd Page 5 of 28 July 2005 9 Channel Pulser System 3 9 Channel Pulser System Specification 3 1 Pulse Generator CPS3 M1 Specification Output pulse amplitude gt 6kV negative pulse into 50Q Permitted bias voltage 500V to 500V Timing monitor gt 5V negative pulse Maximum rep rate 10Hz Connectors amp Interface Low level trigger input BNC Trigger amplifier output SHV External bias input OR monitor SHV High level trigger and bias input SHV Timing monitor SMA HV pulse output TNC MCP bias output LEMO 00 series Mains Power IEC rear panel Size 235mm wide x 98mm high x 30 6mm deep without PFM Power supply 110 240V AC 50 60Hz 20W Indication Power led Trigger led 3 2 Pulse Forming Module PFM Specification when used with CPS3 M1 Output pulse amplitude gt 3kV
22. the interlock is connected and off when you pull out the interlock plug In this case Interlock latched will come ON red All Trigger enable signals will be switched off Update Itrip and Update buttons will flash to remind you to update the system Tripped will be ON red if the current taken from any of the 9 channels has exceeded the preset Itrip level All Biases and Trigger enable signals will be switched off To reset the tripped state press the Trip reset button The Itrip Update and Update buttons will flash to remind you to update the system You can set the trip current level with Update button Each channel is represented within a single line of controls and indicators marked 1 9 Set Vbias is a control to set the bias voltage Vbias Monitor is an indicator to show the bias on the output of the channel IbiasMonitor is an indicator to show the current taken from the output of the channel BiasEnable is a control to switch on the bias voltage on the output of the channel BiasOn is an indicator to show if the bias voltage is enabled on the output of the channel Tripped is an indicator to show the bias current tripped state for that channel Trigger enable is a control to enable triggering of the channel Trigger on is an indicator to show the trigger enable state for the channel Delay is a control to set the del
23. trigger 2 enable rw b3 trigger 3 enable rw Kentech Instruments Ltd Page 23 of 28 July 2005 9 Channel Pulser System b4 trigger 4 enable rw b5 trigger 5 enable rw b6 trigger 6 enable rw b7 trigger 7 enable rw b8 trigger 8 enable rw b9 not used b10 not used bll not used b12 not used b13 not used bl4 not used b15 not used Trigger hardware enable status bits These reflect the state of the enable outputs to the trigger unit b0 trigger 0 on ro bl trigger 1 on ro b2 trigger 2 on ro b3 trigger 3 on ro b4 trigger 4 on ro b5 trigger 5 on ro b6 trigger 6 on ro b7 trigger 7 on ro b8 trigger 8 on ro b9 not used b10 not used bll not used b12 not used b13 not used bl4 not used b15 hw enable ro read to find state of hw interlock 8 3 The Control Commands a bias outputs Name vbias Explanation write desired value for bias voltage Format x n vb parameter 1 x voltage range 500 to 500 volts parameter 2 n channel number 0 thru 8 returned value none Kentech Instruments Ltd Page 24 of 28 July 2005 Name Explanation Format parameter 1 parameter 2 returned value Name Explanation Format parameter 1 parameter 2 returned value Name Explanation Format parameter 1 parameter 2 returned value Name Explanation Format parameter 1 parameter 2 returned value Name Explanation Format parameter 1 parameter 2 returned value
24. urned value Kentech Instruments Ltd 9 Channel Pulser System biasstatus write bias user enable status n b bias user enable status none none gt biastatus read bias hardware enable status gt b none none bias hardware enable status triggerstatus read trigger user enable status tgs none none trigger enable status ltriggerstatus write trigger user enable status x tg x trigger enable status none none gt triggerstatus read trigger hardware enable status gt tg none none trigger enable status delay write desired value for delay x nid x delay range 0 to 50 000 ps rounded down internally to multiples of 25ps n channel number 0 thru 8 none Page 26 of 28 July 2005 Name Explanation Format parameter 1 parameter 2 returned value Name Explanation Format parameter 1 parameter 2 returned value Name Explanation Format parameter 1 parameter 2 returned value Name Explanation Format parameter 1 parameter 2 returned value Name Explanation Format parameter 1 parameter 2 returned value Name Explanation Format parameter 1 parameter 2 returned value Kentech Instruments Ltd delay read desired value for delay n d n channel number 0 thru 8 none desired value in picoseconds safe disable everything equivalent to 0 triggerstatus 0 biasstatus safe none none none version read software version number vit no
25. voltages individually disable all bias voltages individually read back bias enable status write desired value for delay n read desired value for delay enable all trigger outputs individually disable all trigger outputs individually read back trigger enable status read interlock input status 3 6 Cables 9 x N type to SMA 50Q coaxial output cables 2m length 9 x SHV to SHV 50Q coaxial trigger leads 2m length 9 x SHV to SHV 50Q coaxial trigger short leads 30cm for stand alone operation 1 x Lemo connector with 2m flying lead for interlock input 10 x US AC IEC power leads Kentech Instruments Ltd Page 7 of 28 July 2005 9 Channel Pulser System 4 Instrument Description 4 1 Master Control Unit The Master Control Unit MCU consists of a microcontroller module a high voltage trigger generator module and nine Bias Delay channels The MCU may be controlled by a PC connected to the front panel RS232 port The MCU has a front panel nterlock socket the interlock signal must be shorted to ground in order to enable the bias voltages on the HV trigger output connectors CPS3 Master Control Unit Made in England by Kentech Instruments Ltd O www kentech co uk gt c HV trigger outputs Trigger input 5V 50ohms gt gt oO Figure 2 MCU Front Panel The MCU is triggered by a 5V positive edge on the Trigger input BNC connector A high voltage
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