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Caen ELS PreDAC Скачать руководство пользователя страница 14

PreDAC User’s Manual

14

1.5

Dithering

Internal dither frequency for each channel is fixed to 100 kHz. This enables to

achieve 21 bits of resolution in the standard operation mode (the minimum step size
equals 12



V).

The noise introduced by the dithering process is suppressed with active filtering.

The fourth-order active filtering have 80 dB roll-off so the dithering noise is extensively
damped.

In addition to this standard operation mode it is also possible to have the output

voltage without the use of the dithering: the output voltage resolution is reduced to 16
bits (minimum step size equals 366



V) even if the dithering noise is not present.

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Содержание PreDAC

Страница 1: ...1 PreDAC PREcision multi channel Digital to Analog Converter User s Manual All Rights Reserved CAEN ELS s r l BEAMLINE ELECTRONIC INSTRUMENTATION...

Страница 2: ...Rev 1 2 October 2014 This product is certified CAEN ELS s r l Via Vetraia 11 55049 Viareggio LU Italy Mail info caenels com Web www caenels com...

Страница 3: ...3...

Страница 4: ...28 2 3 6 VER Command 29 2 3 7 HWRESET Command 30 2 3 8 ID Command 31 2 3 9 IDSET Command 32 2 3 10 RES Command 33 2 4 COMMAND TABLE SUMMARY 34 3 ETHERNET COMMUNICATION 35 3 1 IP ADDRESS ASSIGNMENT 35...

Страница 5: ...User s Manual 7 3 1 AC Line Input Connector 48 7 3 2 AC Line Voltage Select Switch 49 7 3 3 Output Connectors 50 7 3 4 Cabling 50 7 4 TECHNICAL SPECIFICATIONS 50 8 APPENDIX 51 8 1 LIST OF THE ERROR CO...

Страница 6: ...te Comment 0 1 February 14th 2014 Document created 1 0 April 10th 2014 Images and description added 1 1 July 25th 2014 AC DC part modified 1 2 October 29th 2014 Manual graphics changed 1 3 April 16th...

Страница 7: ...part of the instrument WARNING Do NOT open the boxes CAEN ELS d o o declines all responsibility for damages or injuries caused by an improper use of the Modules due to negligence on behalf of the Use...

Страница 8: ...ed Before you use the device inspect the instrument for possible cracks or breaks before each use Do not operate the device around explosives gas vapor or dust Always use the device with the cables pr...

Страница 9: ...vironmental requirements for a correct operation of the instrument Environmental Conditions Requirements Operating Temperature 0 C to 45 C Operating Humidity 30 to 85 RH non condensing Storage Tempera...

Страница 10: ...pressed using a 4th order active low pass filter with cut off frequency 3 dB of 10 kHz Low temperature drifts good linearity and very low noise levels enable users to perform high precision voltage si...

Страница 11: ...1 front and in Figure 2 rear Figure 1 front view of a PreDAC unit Figure 2 rear view of a PreDAC unit Output Channels ON CL and STATUS LEDs Power Switch Power connector Power and Configuration LEDs T...

Страница 12: ...anges its status every 2 seconds if a fault condition arises the LED blinks with a higher frequency of 2 Hz the led changes its status every 0 5 seconds During the boot phase of the PreDAC unit which...

Страница 13: ...a reset button RST which can be used to reset the unit Next to the reset button are placed a RJ45 Ethernet connector ETH which is used to communicate with the unit and a Small form factor pluggable tr...

Страница 14: ...introduced by the dithering process is suppressed with active filtering The fourth order active filtering have 80 dB roll off so the dithering noise is extensively damped In addition to this standard...

Страница 15: ...sections Commands must be sent in ASCII format and are composed by one command field none one or two parameter field Please note that these fields are separated by a colon or 0x3A in hexadecimal notat...

Страница 16: ...sented ACKnowledge ACK indicates that the command is valid and it was correctly elaborated by the device ACK r n ACK is the ACKnowledgement response to a valid command r n is the termination sequence...

Страница 17: ...nnel 2 CH3 for the channel 3 CH4 for the channel 4 ALL for the concurrent write of the same value to all channels The value parameter is defined as the output voltage to be set in V The value field is...

Страница 18: ...Examples SET output voltage to 2 123456 V on all channels example SET ALL 2 123456 r n ACK r n SET read on channel 2 example SET CHN2 r n SET CH2 11 123456 r n SET zero voltage on channel 3 example S...

Страница 19: ...r a rising edge positive edge on the corresponding Trigger Gate input signal As soon as this event is detected by the PreDAC unit the internal logic transfers the output voltage value from the tempora...

Страница 20: ...User s Manual 20 SET CH1 2 123456 r n ACK r n SET CH3 4 563578 r n ACK r n pause Trigger Gate pin signal positive edge event Output voltage on the output BNC connector is updated pause TRG OFF r n AC...

Страница 21: ...updating of the output voltage is stopped at the falling edge of Trigger Gate This mode acts as a set enabling signal A GATE ON r n string needs to be sent to the PreDAC in order to set it to gate mod...

Страница 22: ...Output voltage on the output BNC connector is updated immediately pause Trigger Gate pin signal negative edge event SET CH1 2 123456 r n ACK r n Output voltage on the output BNC connector is NOT updat...

Страница 23: ...yte 0 bits 7 0 CONFIGURATION byte FAULTS byte The structure of the CONFIGURATION byte bits 15 8 of the status register is hereafter presented Bit Cell caption 15 PreDAC in Slave mode 14 External inter...

Страница 24: ...set the module see the following section Over temperature fault bit 1 this bit is also latching and it is set when the internal PreDAC temperature rises above the 50 C threshold to reset this flag it...

Страница 25: ...PreDAC User s Manual 25 Example STATUS read example STATUS r n STATUS 0181 r n STATUS reset example STATUS RESET r n ACK r n...

Страница 26: ...H1 10 r n ACK r n MAX ALL 13 5 r n NAK r n MAX command read example MAX CH2 r n MAX CH2 12 r n 2 3 3 MIN Command The minimum output voltage of the PreDAC unit can be set through the command MIN channe...

Страница 27: ...e could be OFF default to disable the interlock input or ON to enable it The unit replies to this kind of command with an acknowledgement string ACK r n In order to read the actual set interlock statu...

Страница 28: ...ver the threshold of 50 C the over temperature fault trips and the output voltages are set to 0 V level After a fault event occurs it is necessary to reset the internal status register in order to be...

Страница 29: ...t VER model ver channels r n where model is a string indicating the device i e PREDAC ver cointains the string corresponding to the installed firmware version channels is a string indicating the numbe...

Страница 30: ...performs a complete reset of the hardware and firmware on the on board FPGA thus re initializing the entire PreDAC module control electronics The unit replies with an acknowledgment string ACK r n be...

Страница 31: ...the value stored in the module EEPROM and it assumes the following format ID module_id r n where module_id is the module identification name stored in non volatile memory as an ASCII string The ID co...

Страница 32: ...ment The correct format for this command is as follows IDSET module_id r n where module_id is the ASCII content to be written to the EEPROM Replies from the PreDAC are in the form ACK r n or NAK r n t...

Страница 33: ...6 16 bit setting or of 21 21 bit setting Replies from the PreDAC unit are in the form ACK r n or NAK r n this non acknowledgment reply is generated when the resolution selection is not a valid one not...

Страница 34: ...uery interlock setting RES Set output voltage resolution resolution Query resolution setting SET Set output voltage on the channel y CHy value Set zero output voltage on the channel y CHy OFF Query se...

Страница 35: ...P communication port Parameter Factory value IP address 192 168 0 10 Subnet mask 255 255 255 0 Gateway 192 168 0 1 TCP IP port 10001 Even if the PreDAC device can be connected to a LAN network a point...

Страница 36: ...s Windows XP or newer Intel or equivalent processor 70 MB available HD space Ethernet network card Linux minimum system requirements Linux kernel 2 2 x or newer Intel or equivalent processor 70 MB ava...

Страница 37: ...es by clicking the Scan button as indicated in Figure 5 If there are multiple available networks it is possible to select the network networks to be scanned in the Selected network interfaces window a...

Страница 38: ...the Network configuration of the found devices In order to set the Network configuration it is necessary to select the desired device and to click on the Change device configuration button in the mai...

Страница 39: ...firmware update by clicking on the Update device button as shown Figure 7 The new opened window allows to select the new firmware file Flash file flash Once the flash file has been selected it is pos...

Страница 40: ...4 1 Power Connector The input power connector is a standard male locking jack socket The input voltage is rated at 12V 3 with a maximum input current of 1A The input ON OFF switch is placed above the...

Страница 41: ...nput is also called Trigger Gate signal and it is used to synchronize the update of output voltage of the device to an external event for more information please refer to TRG Command and GATE Command...

Страница 42: ...to the internal digital section and they are reserved for future system updates The not connected pins pins 3 4 are not present or if present they are not connected to the internal digital system The...

Страница 43: ...output voltages The BNC connectors are miniature quick connect disconnect RF connectors mainly used for coaxial cables Channel incremental numbering as can be seen in Figure 12 is right to left OUT1...

Страница 44: ...rity Bipolar Analog Bandwidth BW 10 kHz Output Voltage Accuracy 12 V Output Voltage Noise ppm FS Output Impedance 50 Maximum Output Current 10 mA Rise and Fall time 10 90 35 s Update rate Up to 100 ks...

Страница 45: ...PreDAC User s Manual 45 Additional Features Firmware remote update Ecternal interlock protections Input Voltage Supply 3 12 V Dimensions 195 x 173 x 45 Weight 850 g...

Страница 46: ...PreDAC User s Manual 46 6 Mechanical Dimensions The mechanical dimensions of the PreDAC unit including connectors are hereafter presented in Figure 13 Figure 13 PreDAC mechanical dimensions...

Страница 47: ...112 is a single output 12V linear power supply designed for low noise operation and it is especially suited for low power measurement system where switching power supplies could corrupt measuring accu...

Страница 48: ...at 1 2A maximum output current 7 3 I O Connectors This chapter describes the I O connectors and switches their corresponding pinout and their functionality 7 3 1 AC Line Input Connector The AC Line In...

Страница 49: ...Line e g Europe be sure to select the correct input voltage rating by switching the AC Line Voltage Select switch placed on one side of the box Possible switch positions one for each input voltage ra...

Страница 50: ...female locking power plug cable in order to handle connections to the CAENels TetrAMM device The standard cable length is 1 5m 60 7 4 Technical Specifications Main technical Specifications for the PS...

Страница 51: ...and channel parameter Given parameter is not allowed SET command channel setting see SET Command 11 Wrong SET command value parameter Given parameter is not allowed SET command value setting see SET C...

Страница 52: ...Given parameter is too long see IDSET Command 22 Wrong RES command parameter Given parameter is not allowed RES command setting see RES Command 23 Wrong MAX command parameter Given parameter is not al...

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