User Manual - Glasgow Experimental Particle Physics Internal
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1. Rev 1 1 May 2002 14 User Manual VME HV 203 3 4 1 Functions The following description 1s important for preparing a program which allows to control the card It is important that information passed from the user to the card controller via VME bus are prepared as described It 1s also important that the number of bytes transmitted at every operation is exactly as described Attached to this description Appendix 1 is an example of a simple C program which was used by card designers Channel ON Two bytes are send to the card controller The first one 1s always 1 means the number of bytes following The second one contains a channel number 0 3 and command code Channel OFF As above Setting the channel The user specifies three values nominal voltage in V current trip limit in micro Amps ramping rate code 0 no ramping 1 50 V s 2 20 V s 3 10 V s 4 5 V s This numbers have to be converted to binary representations according to the attached program It is also important that the maxima are observed One should NEVER allow to set more then 500 V and 5000 micro Amps Observe also that over current trip limits are recalculated for four different probe resistors as in the attached program SET command requires that ALWAYS whole chain of 13 bytes is send to the bus control byte command channel byte 2 bytes of voltage 8 bytes for the current limits and 1 byte of ramping rate code After the command is transmitted the card c2. tripped for the overvoltage Comments by Peter W Phillips 1 After switching on a channel one must wait some time for the processor to reach its nominal state before sending any further commands Experimentally this seems to be a large fraction of a second after sending the ON command Rev 1 1 May 2002 15 User Manual 2 VME HV 203 NEVER send a ramp or status request to a channel which has not been switched on I repeat NEVER This completely screws up the communication between the processors In retrospect this should have been obvious Regarding the time which must elapse between writing the two bytes to request the status of a given channel and reading back the 10 bytes of data I find that this can be quite critical Too short and it doesn t work too long and it doesn t work Between a rock and a hard place Having deduced that the first of the ten data bytes represents the number of bytes which follow I modified the code to run the following loop nloop 0 nbyte 0 while nbyte 9 amp amp nloop lt 100 wait rough fraction of mS for i 0 i lt 2000 i j j nbyte ip nloop y Rev 1 1 May 2002 16 User Manual 4 APPENDIX 1 Header file hvstd h define VME EXTENDED 0x00000000 define VME STANDARD 0xFF000000 define VME SHORT OxFFFFOOQO The program file VME HV 203 Simple communication programm in C for VME crate controller which reads and writes data from to HV V
3. LEMO plug FFA 0S 302 CLAK 52 CERN Store SCEM No 09 31 30 060 4 must be used Particularly for ATLAS SCT application for interconnection to SCT LV 2 or SCT LV 3 module cable shown in Fig 6 can be delivered on request 0 5m length default 1 male pin red HV Bias CHO 2 female white HV Ret CHO A eee ee male pin red HV Bias CH1 2 female white HV Ret CH1 Figure 6 LV HV mterconnection cable Rev 1 1 May 2002 FEMALE CANON D SUBI5 HV Ret CHO HV Bias CHO HV Ret CHI HV Bias CH1 13 User Manual VME HV 203 3 PROGRAMMING INFORMATION 3 1 Introduction Operations of the VME SCTHV four channel power supply card are controlled by software which is loaded into program memories of the channel microcontrollers the card microcontroller and the VME crate controller Two lower layers of this software system programs of the channel and card controllers are written in assembler for microcontollers of the family 51 and are loaded into flash memories of the ATMEL 89C2051 4 and 89C52 5 for channel and card controllers respectively Card user does not communicate directly with these layers which can be treated as software emulated hardware functions 3 2 Channel microcontroller program description The program consists of the initialization part and of the endless loop part The initialization part is executed once after power up or after card reset which causes the channel microcontroller r
4. E Base Address DIP Switch 2 3 3 Module calibration The module is calibrated ADC reference voltage correction is set by jumpers and DAC correction Is made by software for each channel User calibration may be required in case of ADC MAX192 replacement Follow this procedure to do it 1 Set 500V for the channel 2 Wait for about 30 min 3 Test output voltage use at least 4 dig voltmeter for 500V 4 Ifthe difference between digital output from computer and output from voltmeter is less then 0 1 V the channel is correctly calibrated if it is bigger go to step 5 5 Two pads named J 05 bottom side of the board should be shorted if output voltage 1s lower then 500V or opened if higher then 500V 6 Set appropriate number of bits to reach 500V where Ibit corresponds to 125mV Jumper positions form the binary value When jumpers are set e g in positions 04 and 03 then 1t means that the correction value is equal to 12 bits Correction equal to 5 bits require jumpers in positions 01 and 03 Rev 1 1 May 2002 12 User Manual 2 4 Operating Environment 2 4 1 Airflow and Cooling VME HV 203 Standard VME crate airflow is required to maintain the operating temperature within specifications of the board Failure to adhere to these requirements may result in poor long term reliability 2 4 2 Power Requirements 5V 300 mA 12V 900 mA 12V 900 mA 2 5 Cables To connect any HV output to load a cable one side ended by
5. ME card include lt s0di1 0 lt h gt include lt math h gt include hve tayna main argc argv Tie argey char argyll unsigned char addr wsk double Ev volts T rr vortdaiv L25 double 1051415 int vilow VALON int channel unsigned char unsigned char unsigned char unsigned char char znak int 1 nbyte clow voltage high current maxcur status tamp VLOWSy chighr GLOWY tlah 4 GL AT mset Set mMeorr corr a alae Erbi VALORS HO wype karta probe resistors for the current measurements PIO VO l 75050007 Lon LH Le050 0 print CU nEN TER CARD ADDRESSS as 2 hex scanf S2x amp karta e g karta karta 65536 for prat an ON ZNATI scanf 5 switch cj f OFF s SET r READ O e Sc amp Channel c case n 1f channel lt 0 11i unsigned char channel channel gt 3 addr unsigned char VME STANDARD karta Ux0U00D gt r10n 2 3050 0 switch ON the channel ramping vVLowr Ay LG ME Es rion 5 520 lt 005 08 IG 2f means OFF the channel rj continue addr 0x01 addr unsigned char VME STANDARD karta 0Ux000D addr 16 channel continue case f 1f channel lt 0 ii unsigned char channel channe1 gt 3 adar insigned chas VME STANDARD karta Ox000D 7 Switch OFF the channel de continue addr 0x01 addr unsigned char
6. SCT HV VME Model HV203 di o Vya x ad Y Ary oes L r ure he I e 1 Tte 094 s a T A hts Te gt 4 gt T P gt x Ne 1 ki e ts A b A User Manual User Manual VME HV 203 Institute of Nuclear Physics IFJ declines all responsibility for damages or injuries caused by an improper use of the module due to negligence on behalf of the User It is strongly recommended to read thoroughly the User Manual before any kind of operation IFJ reserves the right to change partially or entirely the contents of this Manual at any time and without giving any notice Rev 1 1 May 2002 2 User Manual VME HV 203 1 GENERAL INFORMATION 2 u u 22 dida 4 1 1 IT UC ETIS PEEN E eE a E E 4 1 1 1 O 4 1 4 2 C OBL CIS Ii A E E ERA 4 1 2 General Description as 4 1 3 C ard DESC UONA di 5 1 3 1 Cara Oll ol kk uuu uu aaa Te ueke satel a artes eee ner es Gerke anaes eee test ricotta 5 P32 C al AOE CS MO ita lite wis eadt otek a T 5 1 3 3 Squate Wave DENSA een one eR een ee Ree ane nme ac Re a ene ea 5 1 4 Sinole Channel Description i nas ashata ANE DE R iaaa raa a 5 1 4 1 SWE eroa e A ac 5 1 4 2 r aea a NE ET E EA 6 1 4 3 Reclilierumgltipliarandiilir na aulas aa e ts 6 1 4 4 A e en A A A A A 6 1 4 5 Over Current protec ri se qa a a 7 1 4 6 NONIO CS CUMING A ds 7 1 4 7 DOCOMO CUS dias 7 1 4 8 Votare and current readout lala A 7 1 4 9 A eer EA E er a A A A Te
7. VME STANDARD karta F 0x000D gt addr channel continue Rev 1 1 May 2002 17 User Manual VME HV 203 new Settings Tor tie channels Vvoltsges CUEtente CEP lame and ramping rate Case s lf channel lt 0 channel gt 3 continue princi required voltage nn an 1n V Eki scant SE crv RRE do not change the sense of the following io CE AE O O EE OO VE DOS H printf max voltage 500 0 Vyn rv 500 40 voltage int rv 10 0 voltdiv 1f rv lt 20 0 voltage voltage 1 vhigh voltage 256 vhighs unsigned char vhigh vlow voltage s256 vlows unsigned char vlow PLINTH enter Current rap mit Tr UA Ty S yr ready ANa CUr if maxcur lt 0 maxcur 0 if maxcur gt 50 00 printf max prad 5000 uA n maxcur 5000 fOr iSO pa IFEA these are current trip limits two bytes for each probe resistor Gue up leymaxKxeuryi0 000 On LS chigh current 256 clow current 256 TI Cchigh gt 15 ehigh 0x0F clOw 0XE E J x pp 1 CY o OX O2 T chigh chow ctcipk ii unsigned char chigh ctripl i unsigned char clow printf nenter rumping rate code scanf d amp ramping 4 slowest i e 10V s 1 fastest secret 0 no ramping if ramping lt 0 ramping 07 if ramping gt 4 ramping 4 ramp ramping write it down to VME bus addr gt unsigned Ghare VME STANDARD Karte 2 channel L xaddr 0x0C ad
8. Z78 of Upsmax equal 800 V catalogue value is used as series regulator Rev 1 1 May 2002 6 User Manual VME HV 203 1 4 5 Over current protection An absolute hardware over current protection is set to 5 2 mA If the current exceeds this value the voltage is automatically reduced to keep the current below the limit This protection is independent on the programmable current trip limit which 1s described below 1 4 6 Voltage setting Micro controller can set the output voltage of the channel to the required value by setting the 10 bit serial DAC This setting is always controlled via the ramp up or ramp down procedure Ramp up and ramp down rates are to be chosen from several preset values It may happen that the ramp down rate will be determined by the time constant of the circuit rather than by the controller Preset values are 5 V s 10 V s 20 V s and 50 V s 1 4 7 Optocouplers Two optocouplers 6N137 operating at 2 Mbaud inserted into the serial asynchronous and duplex communication line provide electrical isolation between card and channel micro controllers 1 4 8 Voltage and current readout The channel micro controller continuously reads the output voltage and current using 12 bit multichannel ADC The output voltage is measured with high precision voltage divider Output current of the channel may vary from tens of nA to 5 mA Every channel is equipped with the multi range current readout system A particular range is selected b
9. ch channel The permanent loop is almost idle Its main role is in some arbitration In case of conflicting transport requirements Interrupts may come e from the crate controller requesting current status and measurement data from a given channel from the crate controller sending new settings for a channel from the crate controller requesting switching ON or OFF the given channel from the channel controller confirming the reception of new settings from the channel controller sending the requested channel status and measurements from the timer which takes care of frequent interrogation of active channels for the current data 3 4 User program of the crate controller The crate controller program allows to handle and control our HVSCT power supply cards It is usually written in C or C and depends in details on the operating system used to control the VME crate It should provide the user with four principal functions to switch channel ON or OFF to set the required voltage ramping rate and over current trip limit and to read the current channel data A very simple example of a C programme used by designers for the VME crate with crate controller operating under OS9 system is given in the Appendix and may serve as detailed information for programmers As the SCT community uses NI VME PCI interfaces and corresponding Peter W Phillips programmes as certain standard we strongly recommend to observe his comments incorporated at the end of this Section
10. ctive due to workmanship or materials and has not been caused by mishandling negligence on behalf of the User accident or any abnormal conditions or operations 1 1 2 Contacts In case of questions or problems contact the card designers Stefan Koperny tel 48 12 617 2996 E mail koperny uci agh edu pl Edward Gornicki if edu pl or Piotr Malecki if edu pl Tel 48 12 662 8010 Fax 48 12 662 8458 Mail address INSTITUTE of NUCLEAR PHYSICS ATLAS EXPERIMENT LABORATORY ul Radzikowskiego 152 PL 31 342 KRAKOW POLAND www ifj edu pl ATLAS sct scthv 1 2 General Description The VME SCT High Voltage Power Supply is designed to provide the bias voltage for ATLAS SCT modules 1 The HV203 model is a 1 unit wide 6U height standard board It houses 4 fully isolated channels VME interface and square wave generator The system provides digitally controlled stable bias voltage in O 500 V range and a precise measurement of the output current A maximum load of each channel is 5 mA A current trip limit can be set independently for every channel in the range from hundreds of nA to the maximum of 5 mA Another parameter which can be selected individually for each channel is the ramping speed with which the nominal voltage is changed Ramping speed 1s digitally controlled and can be selected from a very wide range Single channel functions are controlled by programmable microprocessor which communicates with a programmable card controller
11. dr unsigned char VME STANDARD karta 0x000D addr 32 channel xaddr vhighs addr vlows bro Leloha een aply cued b Os tadar ctripli0 adar ctriparil raddr a o i si es W IL ACCC wk 1D laly addr ctrkpLLZI xaddr ctriphis l Aq t bari addr ramp continues READ the channel status voltage current some more KA case r if channel lt 0O channel gt 3 continue addr tunsigned char VME STANDARD Karua 2 channel by addr 0x01 addr unsigned char VME STANDARD karta 0x000D addr 48 channel Rev 1 1 May 2002 18 User Manual VME HV 203 g sorry for the following I need some time before card controller is ready with readdressing a buffer corresponding to the requested channel Por LILI 07 TILI lt S20O0 7IL Wypes L I guess that a fraction of a milisecond is enough 2 addr unsigned char gt y VME STANDARD p karte Ox0U00D nob addr status addr vhighr tadar gt vlowr addr entahr tadde clowr addr the following 4 bytes are for technical debug purposes One must read them a mset addr lset addr mcorr addr leorr addr prrnet OC STATUS 22 T Slabusy voltage vhighr 256 vlowr fvolt voltdiv double voltage 10 0 current chigar 256 clowr 1 int status amp 0x03 Feurr L000 00 doubl Ss current 7 P10n 3 71 37 PENCIL Own Voltage Os Li curreni ooc Zin EVO LES Turr continu
12. e default printf nwrong command n continue a Rev 1 1 May 2002 19
13. eee E 1 5 Specifications iia dis 8 1 6 Prone panel Fio 3 uyu uuu y a u us Ai ida 8 1 7 Referentes miosina aran a aq akaqa gaa uqa pasaspa qatayatuaayaqukayashuypastapapyqaqkayqasaaq2 8 2 INSTALLATION u u u inicie 10 2 1 Unpacking an Inspeetipohu k u u u S Saa su 10 2 2 SO S 10 2 3 Hardware prepatalion anida id 10 23 1 Jlapdline procedure umar uu Aiea estate A ae tate en es cg 10 2 32 A A iya E AR 10 2353 Module a ear a 12 2 4 Operating Environmental dai 13 2 4 1 UIE OW a A aaah usata Qusa 13 2 4 2 Power Requirements crsa oa a a a a a 13 2 5 CADIS ni aces 13 3 PROGRAMMING INFORMATION 14 3 1 A i i p ui hui SS Sia huasi s 14 3 2 Channel microcontroller program description 14 3 3 Card Microcontroller program description 14 3 4 User program of the crate controllers a u aaa 14 3 4 1 A 15 4 APPENDIX Tu u u uuu idad ceci 17 Rev 1 1 May 2002 3 User Manual VME HV 203 1 GENERAL INFORMATION 1 1 Introduction This manual describes the elements of the SCT High Voltage Power Supply VME Model HV203 its operation and installation procedures 1 1 1 Warranty IFJ will repair or replace the module within the guarantee period one year from date of shipment if the Guarantor declares that the product is defe
14. eset In this part various flags and initial conditions for timer serial communication port and interrupt services are set Five bits of the signed calibration constant for the ADC reference voltage which are wired into the channel circuitry are also read in and stored in this part of the program Main functions of the channel microcontroller program are realized in an endless loop in which the output voltage and current are permanently read from the corresponding channels of the 8 channel ADC These permanent measurements include application of the proportional ADC correction and overcurrent and overvoltage tests To keep the accuracy of the current measurements at required level over the very wide range of values program automatically selects also the optimal probe resistor This permanent loop is eventually interrupted by the card microcontroller requesting the current status and measurements or communicating new setting values In case of new setting request the permanent loop is extended with the ramping control function 3 3 Card microcontroller program description The card controller program realizes the communication functions between the user program residing in the crate controller and channel microprocessors Its organization is similar to the channel program The part executed after power up or reset initialize timers ports and various flags as well as clears the input buffer ready for new settings and four output data buffers one for ea
15. ontroller passes it to the corresponding channel and the channel starts ramping Observe that the current trip limit has to take into an account the maximum current which may occur during the process of ramping as the test is executed permanently Reading the channel The channel processor reads the voltage and the current permanently It also takes care of automatic selection of one of four probe resistors to keep the measurement accuracy on a decent level Status byte and results of measurements are reported by every active channel to the card controller on its frequent requests Reading the channel by the VME consists of e sending two bytes control byte and command channel byte e receiving 10 bytes control byte status byte two bytes of voltage readout two bytes of current reading and four debug bytes for technical use Please be sure that the proper number of bytes is written and read and that the binary to floating point numbers are converted as shown in the program example One also needs to allow for certain time delay between issuing the READ command and reading the buffer My very rough estimation 1s that it should be a fraction of a milisecond Bits of the channel status byte have the following meanings bits 0 1 least significant bits contain the probe resistor number used for the current measurement bit 2 reserve bit 3 reserve bit 4 unstable voltage bit 5 unrecognized command bit 6 tripped for the overcurrent bit 7
16. ove each connector The diode is off when the corresponding channel is not powered After the channel is switched on but not set the LED blinks very slowly twenty times a minute The diode blinks also several times a second during the ramping up and about once a second during the ramping down of the channel voltage The LED stops blinking when the channel output voltage 1s stable 1 7 References 1 ATLAS Coll Specification for Atlas Silicon Microstrip Detectors for the Atlas Final Design Review ATLAS SCT Detector FDR 99 2 1999 2 The VME bus Handbook Third Edition Wade D Peterson 3 Atlas SCT HV Power Supply Project Specification ver 2 04 http www 1f edu pl ATLAS sct scthv HVSpec_01Feb26 pdf 4 ATMEL Data Sheet 8 bit Microcontroller with 2k Bytes Flash AT89C2051 5 ATMEL Data Sheet 8 bit Microcontroller with 8k Bytes Flash AT89C52 Rev 1 1 May 2002 8 User Manual VME HV 203 K Power Reset ON Figure 3 Front panel of the HV203 model Rev 1 1 May 2002 9 User Manual VME HV 203 2 INSTALLATION 2 1 Unpacking and Inspection Unpack module from shipping carton If carton is damaged upon receipt request that the carrier s agent be present during unpacking and inspection of the equipment Refer to packing list and verify that all items are present Save packing material for storing or reshipping the equipment 2 2 Safety Operating with HV203 board requires that everybody should keep the working rule
17. ram access AM 3D Standard supervisor data access AM 3E Standard supervisor program access Before inserting the VME HV203 board into a VME crate the VME base address must be set The module s Base Address is fixed by DIP switch located on the board see Fig 4 Rev 1 1 May 2002 10 User Manual ATBSC52 gt cal VME CONNECTOR G AL20U8 HUI E i jea KS a29 a EE ae Get a sd SE gH i f Adol hro CON101 asar pp a0 VME Base Address DIP switch Rie af s aa s mis y 22 1108 S aa gt hizo A Ria e 11104 t wal 1 j ATB9C2051 i an MAX4518 AE Es L FUSES MAX4518 o 451 8 E SQUARE WAVE GENERATOR eS he I e l u RaO R302 3 EA CON301 uot EEO al I apa pap ae voz ERE anad HAL ine ul i maxsos_ 8 y uef Dms y a U305 SNS Fas 7 can umo E a ES NP Figure 4 HV203 component side view Rev 1 1 May 2002 VME HV 203 11 User Manual VME HV 203 This is an eight position switch which is used to control A16 A23 VME address bits see Fig 5 Position numbered with 1 corresponds to the least significant bit of the corresponding part of the address ON for a given position means that the corresponding bit is ZERO So e g setting the positions 2 and 4 ON and all others OFF corresponds to the part of address equal to 0xF5 AS shown setting OxF5 A16 Figure 5 VM
18. ransistors IRF520 The chip s outputs OUTA pin 13 and OUTB pin 16 are set by potentiometers T by P91 t by P90 as shown in Fig 1 t 8us lt T 19us gt Figure 1 PWM outputs timing 1 4 Single Channel Description The single channel block diagram is shown in Fig 2 It can be seen that the channel s full isolation is realized by optocouplers in the communication line and by transformer in the supply line 1 4 1 Switch The micro relay ZETTLER AZ850 5 or equivalent controlled by the card processor 1s used to turn power on or off for the channel s transformer Rev 1 1 May 2002 5 User Manual VME HV 203 RECTIFIER OVER THY RA MULTIPLIER REGULATOR CURRENT FILTER PROTECT SQUARE WAVE SWITCH GENERATOR y M E VOLTAGE ERROR B SETTING AMPLIFIER U S CARD CONTROLLER x aan Canes HV CONTROLLER CURRENT READOUT Figure 2 Block diagram of the HV channel 142 Trafo The high frequency transformer 52 kHz square wave has one primary winding for Uom of 58 V and three secondary windings of Uim 280V Ux 12V and U3 12V The ferrite core EF16 is made of N67 material by Simens Uzm and Uy are auxiliary voltages supplying channel s circuitry 14 3 Rectifier multiplier and filter A typical voltage multiplier x2 is based on two high speed diodes UF4007 and two capacitors The high voltage RC filter is applied for a ripple reduction 1 4 4 Regulator The high voltage MOSFET power transistor BU
19. s for high voltage For the safety reason VME crate must be grounded Handling safety is obtained through careful design There 1s no high voltage on the printed circuit board at solder side HV components on component side are covered by heatsinks so that the user cannot accidentally be exposed to it so far the board 1s placed into a VME crate All repairing must be done by qualified person 2 3 Hardware preparation The HV module should be inspected and prepared prior to system installation The following sections describe the proper address setting necessary for system operation 2 3 1 Handling procedure The HV203 board uses CMOS components that are susceptible to damage if exposed to static electrical charges To avoid damage of these components during handling testing or operation the following procedure should be used e Device leads should contact conductive material to avoid building of any static charge except during testing or operation e Soldering iron tips metal fixtures tools used in preparing the module for operation should be grounded e Module should never be removed or inserted while power is applied to the module because voltage transients may permanently damage it 2 3 2 Address setting The module works in A24 mode this means that the module address must be specified in a field of 24 bits The Address Modifiers recognised by the module are AM 39 Standard user data access AM 3A Standard user prog
20. via fast serial link Communication with the crate controller for the VME version uses standard addressing mode Reaction times of processors to various conditions like requirement of a new setting over current and over voltage trips etc are well below 1 ms Rev 1 1 May 2002 4 User Manual VME HV 203 1 3 Card Description One 6U card of the multichannel system of HV power supplies contains four identical channels Some elements located on the card serve all channels the card controller the VME interface square wave generator and circuits responsible for the distribution of power supplied by the power pack of the crate Fig 2 1 3 1 Card Controller The ATMEL flash microprocessor AT89C52 5 is used as the card controller It receives commands from the VME controller 2 and communicates with microprocessors of all channels located on the card Communication with channels is realized via internal serial interfaces operating in the full duplex mode asynchronously at 2 Mbaud rate Transmission of bytes between card controller or channel controllers is buffered and serviced with the help of interrupts 1 3 2 Card Addressing For the full VME version the standard addressing mode is used The card address corresponds to the eight VME address lines A16 A23 and can be set via the dip switch on each card see chapter 2 3 2 1 3 3 Square wave generator Square wave generator is built on PWM Pulse Width Modulator chip SG3526 and two t
21. y the channel micro controller to keep the readout accuracy high These ranges are partially overlapping One measurement cycle of voltage and current takes about 20 ms The accuracy of the voltage measurements can be estimated from the following algorithm 0 1 of the reading 2 digits and similar for the current accuracy 1 of reading 2 digits where the significance of a digit is shown in column resolution in Table 1 for all ranges Table 1 Range and resolution of voltage and current measurement RANGE RESOLUTION 512V Idgt 125 mV 41 97 uA Idgt 10 24 nA Current 209 2 uA Idgt 51 07 nA 1 029 mA Idgt 251 4 nA 5 945 mA Idgt 1 451 uA 1 4 9 Error amplifier This block is based on the operational amplifier OPO7 with a low input offset voltage The voltage regulation loop can be opened or closed by the micro controller When the loop is open then the series regulator is cut off Rev 1 1 May 2002 7 User Manual VME HV 203 1 5 Specifications 3 Table 2 Nominal Data Output voltage 0 500 V Programmable Output current OS mA VME address mode Standard 24 bits 1 6 Front panel Fig 3 The green LED in the center of the front panel indicates that the card 1s powered from the VME crate The reset button next to the green LED resets 1 e restarts the card controller Four fully isolated channels provide output voltage via LEMO connectors ERA 0S 302 CLL numbered from 0 3 One red LED diode is located ab
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