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CAEN-N470

1. The front and rear panels of the model N 470 are shown in Figure 1 on the two fold out pages at the end of this Manual For your convenience keep the photograph of the unit folded out to easily associate descriptions and explanations with the model layout The High Voltage output connectors which are on the back panel are SHV female connectors All other connectors are LEMO 00 type 1 1 FRONT PANEL e Mod 70 i LE 4 CH PROGRAMMABLE HV POWER SUPPLY SEE CHANNEL SEE FUNCTION CHANNELS POLARITY RST HV ON E KILL dt e Q A VSEL CH STATUS on ove ow unv amp up e RAMP DW e MAXV MAXVO MAXV1 MAXV2 MAXV3 DS PN 090 H S 2 am MANRST 2 SPECIFICATIONS 2 4 HIGH VOLTAGE OUTPUTS High Voltage ranges Polarity HV Set and Mon resolution I Set and Mon resolution Ramp Up Ramp Down Vmon HVout accuracy Imon accuracy Vmax accuracy RST min width KILL min width Max Delivered Power Humidity range Operating temperature H V Out temp Coefficient Ripple 4 kV to 8 kV mA maximum output current 3 kV 0 4 kV 2 mA maximum output current 100 V to 3 kV 3 mA maximum output current The three High Voltage ranges are automatically selected and controlled by the control software Any attempt to set a current voltage value i
2. 00000000 00000000 Successful operation 11111 00000000 BUSY module it has tried to effect an operation while the module is still busy registering previous data inside the EEPROM 11111111 The addressed module does not exist This message is generated after a period of 500 ms In the case of a successful operation the contents of the subsequent words are the functions of the command that has been sent 6 2 1 1 PARAMETER SETTING and READING SINGLE PARAMETER SETTING Operation codes 3 to 9 Word 4 must contain the new 16 bit binary value of the various parameters The ranges of the allowed values are reported in the following table 7 TABLE 7 ALLOWED VALUES RANGES Vo V1 V 10 11 kA TRIP s 100 RAMP UP DOWN V s 4000 to 8000 0 to 1000 0 to 9999 1 to 500 Operation codes from 10 to 17 they not require the word 4 in the data pack When the codes 10 and 11 are requested the N 470 gives back in the answer data pack the Successful operation code in the first word and the system Status in the second one 27 MULTIPLE PARAMETER READING Operation code 0 Word 2 to Word 17 contains on the low byte the ASCII code of the string of characters identified by the name of the module and the software version N 470 version n m Operation code 1 Word 2 to Word 17 contains the values of Vmon Imon MaxV and STATUS for the channels 0 1 2 3 in the order Operation code 2 Word 2 to Word 12 contains the values of STATUS
3. CAENET CAMAC Controller The standard CAMAC functions listed in table 3 allow the user to perform the required control and setting operations according to the typical MASTER SLAVE communication protocol where the CAMAC controller assumes the MASTER function 24 TABLE 3 Mod C 117 B CAMAC FUNCTIONS F 0 N Reads the data stored in the Mod C 117 B DATA buffer Q response until the buffer contains data F 8 N Tests the LAM line Q response if LAM is true F 9 N Resets the Mod C 117 B clears buffer and LAM disables the LAM line F 16 N Stores the data into the Mod C 117 B DATA buffer Q response until the buffer is full 256 16 bit words F 17 N Transfers data to the serial line F 24 N Disables the LAM line F 26 N Enables the LAM line Via CAMAC functions the C 117 B module MASTER transmits or receives data packs composed of subsequent 16 bit words to from the addressed Mod N 470 SLAVE Up to 256 words can be stored into the Mod C 117 B DATA buffer The MASTER to SLAVE data have to be written into the DATA buffer by performing subsequent F 16 N functions as follows TABLE 4 MASTER to SLAVE DATA COMPOSITION CAMAC 16 TO W1 MEANING FUNCTION 1 F 16 N 0000000000000001 HOST COMPUTER CONTROLLER IDENTIFIER CODE 2 16 N XXXXXXXXXXXXXXXX ADDRESS NUMBER OF THE MODULE TO BE ADDRESSED 3 16 N XXXXXXXXXXXXXXXX CODE OF THE OPERATION TO BE PERFORMED see TABLE 5 In the following table 5
4. will replace the FUNCTION message an appears on the right hand side of the upper display and the 1 is shown on the most right character of the upper display Once the key has been pressed to confirm the selection of this function the message will disappear and only two character mnemonic code will be shown on the left hand side of the lower display while the right hand side will show the current value of the selected parameter The new value typed if any will appear on the upper display right hand side The current value of the parameter will be actually changed only if the key will be pressed again To cancel the operation before actually affecting the current value of the parameter just type F and select another function If an unknown function code is digitised the system gives an INVALID message If the invalid function is confirmed the function number itself on the upper row start to flash untill the F key is hit again or another legal function number is digitised and confirmed 6 2 REMOTE OPERATIONS The model N 470 is provided with a HIGH SPEED CAENET interface The H S CAENET line uses a simple 50 coaxial cable as physical medium through which the unit can be controlled by the following CAEN modules Mod C 117 B H S CAENET CAMAC Controller Mod V 288 H S CAENET VME Controller Mod A 303 H S CAENET PC Controller the address number station number selected by the F99 function must
5. COMPONENTS i p t tl gebe 9 24 POWER REQUIREMENTS ttt ttt 11 OPERATING 12 SOFTWARE INSTALLATION nessssssssssssssssssssssssssssssssssssssssussssssssssssssssssssssssssssussesssssssssssees 15 4 1 CAENHVWRAPPER LLB LABVIEW VI LIBRARY 15 CALIBRATION PROCEDURE cssssssssssssssssssssssssssssssssssssssssussssssssssssssssssssssssssssssssssssssssssese 17 5 1 EQUIPMENT REQUIREMENT ctt 17 5 2 UVOLTAGECGAPIBEATYIONE etes tte 17 bi CURRENT CALIBRATION socal 18 54 MAXV CALIBRATION ttt ttt 19 PROGRAMMER S GUIDE oesssssssssssssssssssssssssssssssssssssssssssusssssssssssssssssssssssesssssssasassusssscsossssee 21 6 1 MANUAL OPERATION Sect cect tact ie HMM 21 6 2 REMOTE OPERATIONS 23 6 2 1 USING THE H S CAENET CAMAC CONTROLLER MOD 117 24 6 2 1 1 PARAMETER SETTING and 2 8 27 62 1 2 OPERATIONS TO BE PERFORMED rca i crc b t DI GL Le 28 6 2 2 USING THE H S VME CONTROLLER MOD V 288 28 6 2 2 1 OPERATIONS 002000000000000000000000000000 30 6 2 3 USING THE H S PC CONTROLLER A 303 30 62 31 OPERATIONS TO BE PERFORMED oxxene nicer ee o ei E a E Ee 33 1 MODEL OVERVIEW The C A E N Mod N 470
6. LV6 0 Labview 6 0 for linux version Win32 LV6 0 Labview 6 0 for Windows version Win32 LV6 1 Labview 6 1 for Windows version each one divided as follow Samples N470 N570 CAEN N470 ctl vi complete N470 power supply controller sample CAEN N570 ctl vi complete N570 power supply controller sample ReadBitfieldPar vi Subvi used in the above samples ReadBoolPar vi Subvi used in the above samples ReadSinglePar vi Subvi used in the above samples errors CAENHV errors txt the file containing the error codes and descriptions CAENHV Wrapper lIb the library containing all the VIs Labview Windows and Linux are registered trade marks The CAENHV Wrapper and the HSCAENETLib are both available for download at http www caen it computing scdown php and http www caen it nuclear product php mod A 130372 15 1 Installation notes Copy the CAENHVWrapper llb into the labviewdir user lib directory and the CAENHV errors txt file into the Yolabviewdir user lib errors directory labviewdir is usually c program files National Instruments LabView on Windows platform and usr local JvXX in Linux environment 2 Verify the installation launching Labview and opening the functions palette you have to find the all Vis of the library inside the User Libraries Description The library is meant to help the Labview programmer who wants to control the CAEN power supplies using the Wrapper library T
7. any types of used detectors Selection of polarity The User can select positive or negative polarity for each channel by reversing the relevant diode bridge inside the unit see Section 4 The selected channel polarity is shown by the relevant LED on the front panel Displays All operational parameters can be set and monitored on two alphanumeric 8 character LED display A set of 9 LEDs on the front panel shows the status of the selected channel Flexibility in Functions and Controls which include for each channel e Two voltage setting levels Vy and V respectively Two preset current limits levels 10 and I respectively Variable RAMP UP and RAMP DOWN Preset of a desired hardware HV limit that cannot be overridden by any software setting Sophisticated Safety Feature Common to all channels Local or Remote KILL H V enable switch Local or Remote RESET e Selection via an external VSEL signal between the Vo and V preset values e Selection via an external ISEL signal between the Ig and I preset values Generation of an external ALARM signal when a danger condition occurs OVer Voltage OVV UNder Voltage UNV TRIP MAXV or when not calibrated module Handling safety is obtained through careful design All HV components are incapsulated in silicon rubber and no HV is on the printed circuit board so that the maintenance personnel cannot accidentally be exposed to it
8. be the only one in the line in which you wish to insert the module Due to high transmission speed of the data in line it is necessary to terminate this line on a 50 impedance at the end to avoid reflections The control from an A 250 HS CAENET MANUAL CONTROLLER has not been implemented due to the complexity of the unit and the relative high number of parameters that must be controlled and monitored Any attempt to control the unit from an A 250 gives the following message on the controller display No Control by A250 The only parameter that can be modified is the Crate number to select a different module on line Controlling the unit from remote a 16 bit STATUS word is available to monitor the status of the selected channel or of the unit globally The following table reports the meaning of each bit of the STATUS word 23 TABLE 2 N 470 STATUS WORD BIT No CODE MEANING NIIT 2 NITIDO The channel has been switched OFF for TRIP condition The channel is ramping up The channel is ramping down The channel has reached the preset MAXV Positive channel Negative channel Module KILLed by external pulse still active Module enabled to supply HV by the front panel switch NIM standard selected TTL standard selected Non calibrated module 6 2 1 USING THE H S CAENET CAMAC CONTROLLER Mod C117B The model N 470 can be controlled via CAMAC through the Mod C 117 B H S
9. confirm and the unit will ask once again Press to Start Once the key has been pressed the system start the calibration of the selected channel supplying same H V output at the relevant connector The ON LED lights up and the user can read the value of the H V on the voltmeter connected to the output The system asks the user to write the exact value read on the H V voltmeter with the following message The same procedure is repeated 5 times from Vall till Val5 Once the user has confirmed the digitised value the system increases the H V output and asks to repeat the previous step till the end of the procedure After the Val5 value has been introduced the system start to calculate its internal parameters and the unit displays will show the following message It will take a few seconds after that the channel is switched off and the relevant LED on the front panel lights up Repeat the steps 5 and 6 to calibrate the voltage of all the desired channels 5 3 CURRENT CALIBRATION 7 8 Perform the FO function to select the desired channel and connect the reference load to the relevant output connector Perform the F91 function to execute the Current calibration procedure The unit shows on the displays the following message Chx F91 I Calib Press the key on the front panel keyboard to confirm the function selection and the unit will show Press to Conf Press the key to confirm and the unit will ask onc
10. figure appears on the Board This is the High Voltage block housing the four multipliers of the channels and bears a High Voltage Danger sign The cover if fixed to the base through several screws remove them and the cover The four multipliers will appear as shown in figure 4 with the channel 0 multiplier on the right All the HV components are encapsulated in a silicon black rubber and only the DIODE BRIDGE labelled BDG in figure 4 is accessible to the user The diode bridge itself is encapsulated in a silicon rubber with a white dot located on one side If the diode bridge is inserted inside the multiplier block with the white dot towards the transformer the relevant channel is selected as a POSITIVE channel otherwise the channel is selected as a NEGATIVE one 3 Configure the unit to satisfy to your requirements eventually mixing positive and negative channels in the same unit 4 If the polarity of one or more channels must be changed extract the module Bdg from its contacts 12 and insert it in the opposite position according to the figure 4 5 Reassemble the unit S GS BDG Fig 4 Insert the unit inside a NIM crate and switch it ON At the power the two displays show for a few seconds the following messages Mod N 470 and after that the two displays will show Cho Vm Verify the channels polarity checking that the polarity LEDs are switched on according to the programmed configuratio
11. subsequent 16 bit words to from the addressed N 470 module SLAVE Up to 256 words can be stored into the Mod A 303 DATA buffers The MASTER to SLAVE data have to be written into the TX data buffer by performing subsequent WRITE operations as described in the table below T ABLE 11 ORDER OPERATION ADDRESS WRITE WRITE WRITE WRITE WRITE WRITE WRITE WRITE Base address Base address Base address Base address Base address Base address Base address Base address MASTER to SLAVE DATA COMPOSITION DATUM MEANING Low Byte 00000001 High Byte 00000000 Low Byte XXXXXXXX High Byte 00000000 Low Byte Oper Code High Byte Oper Code Low Byte XXXXXXXX High Byte 00000000 HOST COMPUTER CONTROLLER IDENTIFIER CODE THE ADDRESS NUMBER OF THE MODULE TO BE ADDRESSED CODE OF THE OPERATION TO BE PERFORMED see TABLE 5 par 6 2 1 EVENTUAL SET VALUE see par 6 2 1 1 As soon as the data pack has been stored in the TX DATA buffer it can be transferred to the addressed module by performing a WRITE operation on the START TX register base address 1 31 IMPORTANT NOTE For each operation to be performed see codes in TABLE 5 par 6 2 1 on the Mod N 470 it is necessary carry out the WRITE operations indicated in TABLE 11 in the same order and afterwards a WRITE operation on the STATUS TX register The answer data coming from the Mod N 470 is automatically collected in the RX DATA buff
12. 000 V The unit displays will show the following message Adjust the trimmer corresponding to the selected channel in order to vary the value displayed by the H V voltmeter Stop the adjustment when you read a value near to the one reported in the following table Verify that the system modify the output voltage according to the trimmer adjustment and the front panel MaxV LED on the front panel lights up confirm the value pressing the key The system will repeat 5 times the same procedure from stepl to step5 After the last step has been performed the system start to calculate its internal parameters and the unit displays will show the following message It will take a few seconds after that the channel is switched off and the relevant LED on the front panel lights up Repeat the steps from 9 to 10 for all the channels you want to calibrate 11 Switch off the module and wait for a few seconds in order to be sure that all the H V capacitors are discharged Following the procedure described in section 4 to reverse the polarity of the channels you are calibrating Repeat all the steps from 2 to 10 20 6 PROGRAMMER S GUIDE 6 1 MANUAL OPERATIONS The unit can be operated manually through a 12 key keyboard and two 8 character LED displays located on the front panel All the relevant parameters of each channel may be displayed and modified by calling the appropriate functions A function is called by pressing the F key
13. 386 family Dip switches located on the printed circuit board allow the user to set the unit according to the computer to be used The controller is composed of a collection of registers managing the commands acknowledged by the unit and two memory buffers arranged in FIFO logic 512 bytes deep see TABLE 10 30 TABLE 10 Mod A 303 REGISTERS REGISTER BUFFER ADDRESS OPERATION DESCRIPTION Base address 0 WRITE FIFO Logic 512 byte max depth Base address 1 WRITE TX DATA BUFFER START TX Starts the transmission of the TX BUFFER data RESET CAENET INTERFACE Base address 3 Clears TX and RX buffers and reset all the RX DATA BUFFER STATUS REGISTER STATUS REGISTER CLEAR RX DATA 0 Base address 1 Base address 2 WRITE interrupt signals READ FIFO logic 512 byte max depth 8 bit READ READ Reads the register CONFIGURATION table 10 see the STATUS REGISTER STATUS REGISTER and resets a present interrupt Base address 3 READ Reads and clears the RX buffer The two buffers are the TRANSMITTER TX data buffer and the RECEIVER RX one WRITE and READ operations allow the user to perform the required controls and settings on each Mod N 470 where the PC controller assumes the MASTER function in the network according to the typical MASTER SLAVE communication protocol By WRITE READ operations the Mod A 303 MASTER transmits or receives data packs composed of
14. 8 it will cause the channel to trip The output voltage will drop to zero at the programmed rate Ramp down and the channel will be put in the off state If this parameter is set to 9999 the overcurrent may last indefinitely If it is set to 0 the channel will be switched off as soon as an overcurrent is detected irrespective of the programmed ramp down value Absolute maximum High Voltage level which the channel is allowed to reach independently from the preset values Vg or Vj The MAXV can be set in the range from 0 V to 8 kV Setting a value less than 300 V on the parameter can generate a unit malfunction The output voltage cannot however exceed the preset value VMAX set with the relevant screwdriver adjusted potentiometer labelled from to MAXV3 on the front panel The accuracy is 1 5 V VMAX is a hard limit which cannot be overridden High Voltage Monitored value Expressed in Volt Current Monitored value Expressed in microamp 2 3 EXTERNAL COMPONENTS All the external components are located in the front panel of the unit except the SHV output connectors and the relevant Channel On Off LEDs which are housed in the rear one CONNECTORS All the input signals except the RST and the ALARM are provided with two bridge connectors for daisy chaining TTL or NIM standard selectable for the input output signals When the NIM standard is selected the last daisy chained module on the RST KILL VSEL and ISEL line
15. Technical Information Manual Revision n 3 13 September 2002 MOD N 470 4 CHANNEL PROGRAMMABLE H V POWER SUPPLY CAEN will repair or replace any product within the guarantee period if the Guarantor declares that the product is defective 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 CAEN declines all responsibility for damages or injuries caused by an improper use of the Modules due to negligence on behalf of the User It is strongly recommended to read thoroughly the CAEN User s Manual before any kind of operation CAEN reserves the right to change partially or entirely the contents of this Manual at any time and without giving any notice WARNING It has been discovered that when a module which has a crate number equal to 0 is present in a H S CAENET network controlled by Mod C117B Mod V288 Mod 1303 or Mod A303A H S CAENET controllers the communications may not operate correctly This could occur in particular conditions so it is suggested not to use the crate number 0 in the network CONTENTS 1 gt I MODELOVEIVEBW cocti en etme E EU 5 1 1 FRONT PANEL enean dotate diee toten a dete ele 7 SPECIFICATIONS a a ue eie innt asia ure 8 2 1 HIGH VOLDAGEQUIPLLIS 8 2 2 PROGRAMMABLE PARAMETERS ttt 8 2 3 EXTERNAL
16. Vmon Imon Vo set set V1 set I set TRIP ramp up ramp down and in that order of the channel selected by the code from 0 to 3 held in the high byte of the operation code 6 2 1 2 OPERATIONS TO BE PERFORMED 1 Insert a Mod C 117 BH S CAENET CAMAC Controller into a CAMAC slot 2 Connect the C 117 B SERIAL LINE connector to the SERIAL IN OUT input connector located on the front panel of the Mod N 470 using a 50 Q coaxial cable 3 Turn on CAMAC crate and Mod N 470 4 By performing the appropriate CAMAC functions configure the Mod N 470 as required 6 2 2 USING THE H S CAENET VME CONTROLLER Mod V 288 The Mod N 470 can be controlled remotely via VME through the Mod V 288 H S CAENET VME controller Standard VME cycles allow the user to perform the required control and setting operations on each Mod N 470 in the network according to the typical MASTER SLAVE communication protocol where the VME controller assumes the MASTER function The Mod V 288 VME interface is provided with the following registers 28 TABLE 8 Mod V 288 REGISTERS NAME TYPE ADDRESS FUNCTION DATA BUFFER READ WRITE register Base Address 00 DATA STORAGE STATUS REGISTER READ only register Base Address 02 AFTER A H S CAENET OPERATION HAS BEEN PERFORMED THIS REGISTER INDICATES WHETHER THE OPERATION IS VALID OR NOT FFFE VALID OPERATION FFFF NO VALID OPERATION TRANSMISSION WRITE only register Base Address 04 B
17. Y WRITING INTO THIS REGISTER THE DATA REGISTER BUFFER CONTENT IS TRANSFERRED TO THE ADDRESSED SLAVE RESET REGISTER WRITE only register Base Address 06 MODULE S RESET INTERRUPT WRITE only register Base Address 08 INTERRUPT VECTOR PROGRAMMING VECTOR REGISTER By WRITE READ cycles the Mod V 288 MASTER transmits or receives data packs composed of subsequent 16 bit words to from the addressed N 470 SLAVE Up to 256 words can be stored into the Mod V 288 DATA buffer The MASTER to SLAVE data have to be written into the DATA buffer by performing subsequent WRITE cycles as follows TABLE 9 MASTER to SLAVE DATA COMPOSITION ORDER OPERATION ADDRESS DATUM MEANING WRITE Base address 00 0000000000000001 HOST COMPUTER CONT ROLLER IDENTIFIER CODE 2 WRITE Base address 00 XXXXXXXXXXXXXXXX THE ADDRESS NUMBER OF THE MODULE TO BE ADDRESSED 3 WRITE Base address 00 XXXXXXXXXXXXXXXX CODE OF THE OPERATION TO BE PERFORMED see table 5 par 6 2 1 WRITE Base address 00 XXXXXXXXXXXXXXXX EVENTUAL SET VALUE see table 6 par 6 2 1 1 As soon as the data pack has been stored in the DATA buffer it can be transferred to the addressed module by performing a WRITE operation on the TRANSMISSION register IMPORTANT NOTE For each operation to be performed see codes in TABLE 5 par 6 2 1 on the Mod N 470 it is necessary each time to carry the WRITE cycles indicated in TABLE 8 in the same order and afterwards a WRITE operation
18. e again 18 Press to Start Once the key has been pressed the system start the calibration and ask the user the value expressed in kQ of the reference load connected to the output Once digitized and confirmed the exact value of the load the system proceeds to the current calibration for the Imon first and the Iset after The user can evaluate the procedure evolution from the front panel displays that will show the following message where the calibration steps range from 1 to 5 After the last step has been performed the system start to calculate its internal parameters and the unit displays will show the following message It will take a few seconds after that the channel is switched off and the relevant LED on the front panel lights up Repeat the steps from 7 to 8 for all the channels you want to calibrate 5 4 MAXV CALIBRATION 9 10 Perform the FO function to select the desired channel and connect the H V voltmeter to the relevant output connector Perform the F92 function to execute the MaxV calibration procedure The unit shows on the displays the following message F92 Calib Press the key on the front panel keyboard to confirm the function selection and the unit will show Press to Conf Press the key to confirm and the unit will ask once again Press 2 to Start 19 Once the key has been pressed the system start the calibration and adjust the H V output at about 6
19. er As soon as the data pack is stored in this buffer the controller unit gives an interrupt 1f enabled to the CPU in the computer and then the data can be read The first word in the answer data pack is always the Host Computer Controller Identifier Code resent back to the master by the addressed unit The second word of the answer data is shown in TABLE 12 TABLE 12 WORD 2 CONTENT HIGH BYTE LOW BYTE MEANING 00000000 00000000 Successful operation 11111111 00000000 BUSY module it has tried to effect an operation while the module is still busy registering previous data inside the EEPROM 11111111 00000001 Code not recognised or message incorrect Any other error condition which is not mentioned in table 12 must be controlled by the user In the case of a successful operation the contents of the subsequent words are the functions of the command that has been sent See par 6 2 1 1 for the Parameter Setting and Reading The STATUS REGISTER of the controller unit gives the current communication status as shown in TABLE 13 32 TABLE 13 STATUS REGISTER CONFIGURATION C RN RESTART in progress In this status the module cannot accept commands E f The RX FIFO has been unloaded Interrupt generation 6 2 3 1 DPERATIONS TO BE PERFORMED 1 Set the H S CAENET PC Controller according to the computer type to be used then insert it into an T O slot 2 Connect the Mod A 303 output co
20. followed by a number and by the key The numbers and their associated functions are shown in the following table 21 TABLE 1 FUNCTIONS and MESSAGES NUMBER MNEMONIC MESSAGE RANGE MEANING vos 0 V to 8000 Programs the first High Voltage value Pre 0 to 3000 pA Programs the first Current Limit value 0 to 3000 pA Programs the second Current Limit value E 0 to 9999 Programs the Trip Time ae peel ee Lee eme po pem eme Le el ee em 9 em eem Jen Selects the standard TTL or NIM of the hardware monitor signals e pum pem a mmm m pem em mme KENNEN NNNM 7 77 M pelo eee 7 NOTE The channel number to which all the commands and information on the displays and LEDs are referred is always shown on the left hand side of the upper display The digitised data becomes active only after the key has been hit So for example to select the channel 1 the CHANNEL function is first called by typing FO see table 1 followed by the desired channel number 1 and confirmed pressing the key Then for example to set the Vo value High Voltage type F1 followed by the desired value in Volt 22 As soon as the F key has been hit the word FUNCTION will appear on the lower display to indicate that a function is expected After typing I the message VO SET
21. he VIs are in fact almost merely calls to the CAENHVWrapper dynamic library integrated with an error handling suited for the Labview environment The VIs implemented are those functions of the CAENHVWrapper library that do not need to pass lists as parameters due to an incompatibility issue between C and Labview data types In general all the VIs use the name of the system and an error cluster as input parameters and also return them as output in this way you can link the VIs together in a chain to ensure a sequential series of calls to the library this is more important for CAENET communications You can refer to the CAENHVWrapper library manual for a description of the functions and to the samples in this archive as a hands on explanation 16 5 CALIBRATION PROCEDURE The modules have been thoroughly and carefully tested before delivery to insure maximum reliability and precision Particular care is given to the High Voltage calibrations which are made with C A E N instrumentation and a reference HV voltmeter standard If the unit or one of its components gets damaged and or parts need replacements the user must remember that calibrations are usually lost Consequential if such a situation occurs or if the calibration is anyhow suspected the user is advised to return the unit to C A E N Iabs Our Technical Service shall take care of repairing the Module and shall also check all the calibrations If the user intends to proceed
22. hts up the channel is switched OFF 1 OVC RED when it lights up the channel is draining a current equal to the preset active current limit 10 or I1 1 OVV RED when it lights up the channel is supplying a voltage at least 100 V greater than the preset active value Vo or V1 1 UNV RED when it lights up the channel is supplying a voltage at least 100 V smaller than the preset active value Vo or V1 1 TRIP RED when it lights up the channel is switched OFF at the end of the programmed TRIP time 1 RAMP UP YELLOW when it lights up the channel is ramping up to reach the preset active value 1 RAMP DW YELLOW when it lights up the channel is ramping down to reach the preset active value or to be switched off 1 MAXV RED when it lights up the channel has reached the relevant preset VMAX limit 1 RED when it lights up the relevant module is the actual addressed unit on the line 10 H V Enable Alarm Channel On Off LAMPS SWITCHES PUSH BUTTONS TRIMMERS KEYBOARDS 1 RED signalling when the unit is enabled to supply the High Voltage on the outputs 1 RED it lights up on when the ALARM output becomes TRUE 4 CHI CH2 CH3 when it lights up the relevant channel is switched on L HV ON RED when it lights up at least one of the channels is in the ON status When the H V is disabled through the relevant front panel switch or the channels are switched off the
23. independently the following guidelines are provided to test the calibration of his unit CAEN not be considered responsible of an user recalibrated module which is out of the declared specifications The user who made the calibration procedure has to be sure concerning the quality of the reference instruments used and the effective correspondence between the values read on the H V voltmeter and the true values 5 1 EQUIPMENT REQUIREMENT One High Voltage Voltmeter One reference resistive load in the range from 1 to 8 MQ 1 The following steps must be performed only in the given sequential order Remember all the data must be confirmed by pressing the key 1 Following the procedure described in section 4 to set all the channels of the module as positive channels 2 Insert the unit inside a NIM crate and switch it ON 3 Adjust the MaxV of all the channels at the maximum clockwise turning the front panel screw driver trimmers 4 Enable the H V output 5 2 VOLTAGE CALIBRATION 5 Perform the FO function to select the desired channel and connect the H V voltmeter to the relevant output connector 6 Perform the F90 function to execute the Vmon calibration procedure The unit shows on the displays the following message 17 Chx F90 V Calib Press the key on the front panel keyboard to confirm the function selection and the unit will show Press to Conf Press the key to
24. is a FOUR CHANNEL PROGRAMMABLE HIGH VOLTAGE POWER SUPPLY housed in a two unit wide NIM module the unit has 4 independent H V channels able to supply four output voltages from 0 up to 8 kV Its wide range of current and voltage along with a versatile protection scheme monitoring and control functions make it ideal for powering the full spectrum of detectors used in the modern Physical research such as photomultipliers PMs wire chambers streamer tubes silicon detectors and so on The module is flexible enough to be adequate for both experiments where several channels are to be monitored by an on line computer and for the test labs where simple manual operation of a limited number of channels is often required All the operational parameters can be programmed and monitored either locally via the front panel keyboard and displays through specifically designed functions or remotely via the High Speed CAENET network and relevant controllers Via the front panel keyboard can also be selected the standard TTL or NIM of the signals used as hardware controls and through a very small set up the user can calibrate each channel of the unit and store the resulting data in an internal EEPROM see Section 5 Among its most relevant features there are Wide Voltage Current Capability can operate in three ranges 0 to X3 kV 3mA 3 kV to 4 kV 2 mA 4 kV to 8 kV 1 mA Therefore the units can cover all available commercial PM tubes and
25. lamp is alighted until one of the HV outputs is greater than 100 V 1 HV ENABLE to enable disable all the unit channels to reach the preset active HV level when in the ON position the relevant LED is switched ON 1 MAN RST manual unit RESET 4 0 MAXVI MAXV2 MAXV3 multi turn potentiometers to set the allowed absolute maximum HV outputs in the range from 0 V to 8 kV 1 12 key front panel keyboard to program and monitor all the operational parameters of the unit 2 4 POWER REQUIREMENTS The following power comsuptions are referred to the unit with all the channels supplying 3 and 3 mA to the loads maximum deliverable power Note that older versions feature the key instead of the key its function however is the same 11 3 OPERATING MODES The model N 470 lets the user select the High Voltage polarity with simple operations which are detailed in this Section Note that the polarity is indicated by two LEDs for each channel on the front panel 1 In order to change polarity the user must switch off the unit and wait for the complete discharge of the capacitors then remove the side covers thereby making access to the Printed Circuit Boards 2 Lay down the unit NIM crate connector on the left and the front panel on the right components side up and refer to Figure 3 DANGER HIGH VOLTAGE p lo o Ho dolio Fig 3 A large module labelled F in the
26. n connect the H V cable linking the outputs to the relevant loads to be supplied and enable the H V outputs switching the HV ENABLE front panel switch in the position in which the relevant LED lights up After a reset all the channel are in OFF condition irrespective of the last saved configuration In this way the user must switch on all the channels he needs either by the specific function or by the remote operation Perform all the programming steps either locally or remotely you need to obtain the wished configuration 14 4 SOFTWARE INSTALLATION 4 1 CAENHVWrapper llb Labview VI library This archive contains the CAENHV Wrapper llb Labview VI library for the following versions of Labview Labview 6 0 for Windows Labview 6 0 for Linux Labview 6 1 for Windows each one in a separate directory Each directory contains the CAENHV Wrapper llb Labview VI library the relevant documentation and the file containing the error codes and descriptions More info concerning this utility are available on CAEN s Web Site at http www caen it computing or via e mail at support computing caen it The VIs contained in this library require the previous correct installation of the CAENHVWrapper and the HSCAENETLib dynamic libraries Control of CAEN Power Supplies via CaeNet link requires the correct installation of the A303 A and or A1303 device driver Content of the archive Readme txt Warning text file Linux
27. ncoherent with the relevant voltage current generates a flashing of the displays The system in this case is waiting for a correct value the user can only press the F key to abort the operation or give the rigth parameter value see note on pag 8 positive or negative selectable by the user as described in section 4 1V 1 up to 500 V sec 1 5V 2 10 uA 1 5 100 ms 15 us 36 Watt in the ranges 3 kV 3 mA 4kV 2mA 30 Watt in the range 8 kV 1 mA 0 to 80 96 0 to 45 C max 0 005 C 300 mVpp at full load 2 2 PROGRAMMABLE PARAMETERS For each channel the following parameters can be programmed and monitored either locally or remotely Vo First High Voltage programmed value Expressed in Volt 10 RAMP UP RAMP DOWN TRIP VMAX VMON IMON First Current Limit programmed value Expressed in microamp Second High Voltage programmed value Expressed in Volt Second Current Limit programmed value Expressed in microamp Maximum High Voltage increase rate Expressed in V s Maximum High Voltage decrease rate Expressed in V s Maximum time an overcurrent is allowed to last expressed in hundreds of a second When a channel is in overcurrent condition it works as a current generator the output voltage is enabled to vary in order to keep the output current less than the active programmed value 10 or Ij If an overcurrent lasts more than the programmed value from 1 to 999
28. nnector to the SERIAL IN OUT input connector located in the front panel of the Mod N 470 with a 50 Q coaxial cable 3 Turn ON the computer and the Mod N 470 4 By performing the appropriate WRITE READ operations configure each Mod N 470 as required 33
29. on the TRANSMISSION register 29 The answer data coming from the Mod N 470 or Mod V 288 itself are automatically stored into the Mod V 288 DATA buffer As soon as the data pack is stored in this buffer a VME interrupt if enabled is generated and then the data can be read The first word of the answer data is shown in TABLE 6 par 6 2 1 In the case of a successful operation the contents of the subsequent words are the functions of the command that has been sent See par 6 2 1 1 for Parameter Setting and Reading 6 2 2 1 DPERATIONS TO BE PERFORMED 1 Insert a Mod V 288 H S CAENET VME Controller into a VME slot Make sure that the V 288 base address is set as required 2 Connect the Mod V 288 SERIAL LINE connector to the SERIAL IN OUT input connector located on the front panel of the Mod N 470 with a 50 Q coaxial cable 3 Turn ON VME crate and Mod N 470 4 By performing the appropriate VME WRITE READ cycles configure each Mod N 470 as required 6 2 3 USING THE H S CAENET PC CONTROLLER Mod A 303 The Mod N 470 can be controlled via an IBM PC XT AT or 80386 or compatible through the Mod A 303 H S CAENET PC controller This is an interface board directly insertable into a std I O PC slot and is mapped in the MS DOS I O or memory address space Thereby it is controllable by all the languages high level or assembly through the proper instructions independently from the computer type XT AT or 80
30. s must be terminated with a 50 O impedance load 1 ALARM Lemo 00 type output TRUE when a danger condition occurs in a channel OVV UNV TRIP MAXV or non calibrated module 1 RST Lemo 00 type remote reset input All the channels are switched OFF and the H V is not present at the outputs 2 KILL Lemo 00 type input When it becomes TRUE all the channels are switched off irrespective of the Ramp Down value programmed DISPLAYS LEDs Channel Polarity Channel Status H S CAENET 2 VSEL Lemo 00 type input Selects the active programmed value between Vo FALSE and V1 TRUE for all the channels The H V outputs vary between the two values with the programmed Ramp Up and Ramp Down 2 ISEL Lemo 00 type input Selects the active programmed value between 10 FALSE and Ij TRUE for all the channels 2 H S CAENET Lemo 00 type High Speed CAENET line 1 SHV type for each channel distributing the H V output 2 8 character alphanumeric LED displays showing all the operational parameters and functions 1 GREEN for each channel when it lights up the relevant channel has been preset as positive 1 YELLOW for each channel when it lights up the relevant channel has been preset as negative The meaning of the following LEDs refers to the channel number shown in the left hand side of the upper display 1 ON RED when it lights up the channel is switched ON 1 OFF GREEN when it lig
31. the CH reported as high byte in some of the allowed operation codes is a binary number from 0 to 3 selecting the channel number to which the operation is referred to 25 TABLES BINARY CODE OF THE OPERATION TO BE PERFORMED TO CONTROL THE MOD N 470 OPERATION CODE HIGH BYTE LOW BYTE RESULT 00000000 00000000 READS THE IDENTIFICATION MODULE S NAME AND THE SOFTWARE VERSION S NUMBER 1 00000000 00000001 READS Vmon Imon MaxV and STATUS FOR ALL THE CHANNELS 2 CH 00000010 READS ALL THE OPERATIONAL PARAMETERS OF THE SELECTED CHANNEL 00000011 SETS THE Vo VALUE OF THE SELECTED CHANNEL 00000100 SETS THE Ip VALUE OF THE SELECTED CHANNEL 00000101 SETS THE V VALUE OF THE SELECTED CHANNEL 00001001 SETS THE RAMP DOWN OF THE SELECTED CHANNEL EMEN E 2 5 o feee After the required F 16 N functions have been performed it is necessary to carry out an F 17 N function in order to transfer the stored data to the addressed module The answer data coming from the Mod N 470 or Mod C 117 B itself are automatically stored into the Mod C 117 B DATA buffer and are read out in Q STOP mode through the functions F 0 N IMPORTANT NOTE For each operation to be performed see TABLE 5 on the Mod N 470 it is necessary each time to carry out the functions indicated in TABLE 4 in that order and afterwards an F 17 N 26 The first word of the answer data is shown in TABLE 6 TABLE 6 WORD 1 CONTENT HIGH BYTE LOW BYTE MEANING

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