CSO-FFTS User Manual
Contents
1. Operate Tools Browse Window Help Feel 2 Leveling Mon Data mT N ee a Bee aaa a ee en za Er ur i Marker Spacing gt Add Marker Delete Marker z AutoScale x ir LIGNI y aaa Reff Dup n Mode Add all Phases Max FFT Time 100000 000 Wire Save Pro Data eque EmN at U E as eee I I I I Se ete eae 1S 16 Fig 2b In fixed scale mode of the display LabViewMon allows to select subsections of the bandpass for a zoomed in view of the display File Edit Operate Tools Browse Window Help Leveling Mon Data ee gt count Phase Dump Rebin Le Reff Dups G on inteqra 15 Add Mode e Add all Phases Max FFT Time 100000 000 Wee Save Pro Data ec Ero Nyquist co Cee Since 2G5 WEGEN I l 9 10 11 12 13 14 15 16 Fig 3 In fixed scale mode of the display one can select subsections of the bandpass see the white vertical help lines to zoom into the spectrum File Edit Operate Tools Browse Window Help Feel 2 Spectra Leveling Mon Data co count Phase Dump Rekin METS Reff Dups ons lntegrations Add Mode Add all Phases Max FFT Time 100000 000 Wis Save Pro Data Sample Rate RIE Bandwidth I 14 15 16 1 l a 1 Fig 4 The upper panel shows the selected subsection of the bandpass 588 826 MHz as marked in Fig 3 It is possible to repeat this zoo2. shared 2 starts the vncviewer with a connection to the virtual desktop 2 or double click to the VNC icon located on the KDE desktop ae N B The VNC viewer can be launched on every PC Linux and Windows in the network 5 The FFTS control software is started by the FFTS setup script startWOLA from the home directory gt startWOLA This setup script initializes and loads the FPGA on the IRIG B Blank Sync board RD 01 and launches the FFTS control software During this boot sequence which takes typically 15 seconds the following text is displayed in the active terminal window FFT Spectrometer FFTS FPGA CORE max 2 GSPS WOLA FFT 8192 channel VERSION 8 19 RELEASE BUILD Nov 29 2007 SI st ei a ip st a as Si Sn loa msds leap ne TELESCOPE CSO BACKEND FFTS1 AC240 BOARDS 1 AC240 INPUT 1 FPGA Core WOLA 8K channel Port SCPI UDP 16200 Port FitsWr TCP 25144 Simulate NO Control UDP SCPI REMARK Found KOLTER Baseaddress at 0x8400 REMARK Found IRIG B timer card with FPGA Core version 1 03 REMARK Create FitsWriter Server thread REMARK FitsWriterServer started REMARK Wait for Client at port 25144 REMARK Lock memory no paging REMARK Set highest process priority and FIFO scheduling AcqrsD1 multiInstrAutoDefine OK REMARK Detected AC240 boards 1 Init AC240 board number 0 AcqrsD1 InitWithOptions OK AcqrsDl getInstrumentData OK Acqiris Name AC240 Serial Nu
3. 0 37 716 0000 As soon as this is displayed the FFTS is in full operation mode and ready to use for observations For thermalization of components in the FFTS particularly the ADC which can cause baseline instabilities we recommend to wait another 5 10 minutes before starting regular observations 5 Start of the graphical on line display LabView Monitor Independent of the FFTS control program there is an online display LabViewMon available for the FFTS which is implemented as a LabView application The LabViewMon provides additional information about the status bandpass level blank sync time FPGA temperature etc of the FFTS to the user which is not available within the SCPI commands The LabViewMon can be started by double clicking the corresponding icon on the VNC desktop of the FFTS PC WOLA LabView 6 The graphical on line display LabView Monitor After double clicking on the startup icon within a few seconds the LabView monitor window will appear Fig 1 Start the application by pressing the LabView start button File Edit Operate Tools Browse Window Help gt Een A ae Spectra Leveling Reff Dups lntegrations A EB Add M Mlode Sedol all PH Max FFT Time Nyquist ee na Sample Fate 20c s Bandwictn l l l I I I I I l l l l l l l l i 2 a 4 amp amp 7 amp u m i lage e if IE 4 F Fig 1 Display of LabViewMon In the upper panel the bandpass of th
4. Max Planck Institut fiir Radioastronomie CSO FFTS User Manual Bernd Klein Max Planck Institut f r Radioastronomie Bonn Issue 1 0 Document CSO MPI MAN O2 Keywords FFTS CSO spectrometer Change Record REVISION DATE AUTHOR SECTIONS PAGES REMARKS AFFECTED 20071201 B Ken newissue 1 mn On TEE HE HE HE TEE S S Table of Contents PUDO S es E eae neat TEE ee een 3 2 Reterence DOCU MED eaaa a E E AR 3 50 BY On ne 3 EPET SSA ee ee ee ehe ee 4 5 Start of the graphical on line display LabView MOMitor ccccccccccccceecceseeseeeeccceeeceaaeeeeceeaeceeaees 6 6 The graphical on line display LabView Monitor uuu0sssessnnnnnnnnnnnnnnnsnsnnnnnnnenenenenennnnnnnnn 7 TH POPOV CRMCAUING Sale bY ee 11 SEES SO We a errno eee ere erent 12 9 TroubleST00uNn9 as eier 12 1 Purpose The purpose of this document is to provide the user with all necessary background information to operate the CSO FFT spectrometer FFTS within the CSO environment in the observing mode This document does not address the possibilities to use the FFTS outside the CSO control software e g for low level debugging Also this document does not cover the technical aspects and specifications of the CSO FFTS For this the interested reader is referred to the CSO FFTS Design Description RD 01 For questions which go beyond this document or for any kind of problems please contact B Klein from th
5. e FFTS is shown in a logarithmic level y scale and a linear frequency x scale DC to 1 GHz In the lower panel the bandpass is plotted on a linear scale for both axis In the right column the operational parameters blank sync time FPGA temperatures etc and the settings for the FFTS are listed Note The CSO FFTS version provides only one bandpass 1 x I GHz therefore only one FPGA temperature is displayed After start up the LabViewMon displays the graphs in auto scale mode which means that the level and frequency scale are automatic adjusted to display the complete bandpass These plotting ranges may be changed by clicking with the right mouse button to the corresponding scale and un selecting auto scale as shown in Fig 2 In fixed scale mode it is possible to zoom into subsections of the bandpass by selecting the correspon ding range with the mouse e g to inspect the data in more detail Fig 3 File Edit Operate Tools Browse Window Help gt een 2 Leveling Mon Data Marker Spacing gt Add Marker Delete Marker HAON gt J AutoScale count Phase Dump Rebin mE Reff Dups 6 iB lntegrations Add Mode e Add all Phases Max FFT Time 100000 000 irs Save Pro Data Eo Nyquist Band A BEER 205s MEEA l i 9 10 11 12 13 6 Fig 2a By selecting the axis sub menu right mouse button it is possible to switch between auto and fixed scale display mode File Edit
6. e Max Planck Institut f r Radioastronomie e mail bklein mpifr bonn mpg de 2 Reference Documents RD Ol CSO Fast Fourier Transform Spectrometer Design Description CSO MPI DSD 02 RD 02 APEX SCPI socket command syntax and backend data stream APEX MPI IFD 0005 RD 03 B Klein S D Philipp I Kramer et al 2006 A amp A 454 L29 RD 04 B Klein S D Philipp R G sten et al 2006 SPIE Vol 6275 pp 627511 RD 05 D Muders H Hafok F Wyrowski et al 2006 A amp A 454 L25 3 Definitions In the course this document we will use the following abbreviations IF CSO Heterodyne IF system delivered from MPIfR FFTS Fast Fourier Transform Spectrometer user manual ADC Analog to Digital Converter FPGA Field Programmable Gate Array MPIfR Max Planck Institut fur Radioastronomie 4 FFTS startup To startup the FFTS after a power shut down 1 Switch on the Acgiris FFTS unit power switch on the front of the FFTS crate 2 After a few seconds delay the Linux PC FFTS PC can be switched on power switch on the front of the FFTS PC 3 During the booting of the Linux system the Acqiris AC240 digitizer analyzer boards which are connected via a PCI bus extension will be detected and displayed in the boot messages The boot phase of the FFTS PC is finished when the KDE desktop appears The boot phase of the FFTS PC is finished when the KDE desktop appears 4 Start the VNC viewer from a terminal window gt vncviewer
7. mber 48 Bus Number 5 Slot Number 15 AcqrsD1 getMemory OK Max Number of Samples 10000 Max Number of Segments 1 REMARK Clear XILINX finished REMARK Loading FPGA image finished AcqrsD1 configLogicDevice OK AcqrsD1 configMode OK AcqrsD1 configHorizontal OK CH1 AcqrsD1 configVertical OK CH2 AcqrsD1 configVertical OK REMARK Calibrate ADCs for interleave mode AcqrsD1 calibrate OK REMARK Switch XILINX on REMARK Number of FPGA accumulations 4000 AcqrsD1l acquire OK REMARK Create control thread UDP SCPI REMARK SCPIctrlThread started REMARK Now the FFTS is ready for observing Good luck After the boot sequence is finished the active terminal window will display the SCPI communication RD 05 between the telescope control system and the CSO FFTS e g UDP SCPI recv CSO FFTS1 BAND1 IFAtten UDP SCPI send CSO FFTS1 BAND1 IFAtten 10 2007 06 21T20 50 36 657 0000 UDP SCPI recv CSO FFTS1 integrationTime UDP SCPI send CSO FFTS1 INTEGRATIONTIME 983 2007 06 21T20 50 36 775 0000 UDP SCPI recv CSO FFTS1 BAND1 minIFLevel UDP SCPI send CSO FFTS1 BAND1 MINIFLEVEL 14 00 2007 06 21T20 50 36 849 0000 UDP SCPI recv CSO FFTS1 BAND1 bandWidth UDP SCPI send CSO FFTS1 BAND1 BANDWIDTH 1000 000 2007 06 21T20 50 37 261 0000 TCP Send 32840 Bytes Dump 3 Phase 1 UDP SCPI recv CSO FFTS1 BAND1 numSpecChan UDP SCPI send CSO FFTS1 BAND1 NUMSPECCHAN 8192 2007 06 21T20 5
8. ming in to inspect subsections of the bandpass in more detail In fixed scale mode LabViewMon allows to modify the axis range smaller x span by overwriting the min max values manually as illustrated in Figure 5 File Edit Operate Tools Browse Window Help Spectra Leveling State _Funning Mon Data 95 ceo count Phase Dump Rebin ji Reff Dups Le Integrations Bin A amp A B E D Add Mode Add all Phases as T 100000 000 ie Save Pro Data requer Nyquist conc AQ Raines 2GS WERNER l Al SSSI ri Fig 5 In the fixed scale mode the min and max values of the axis can be overwritten manually Fig 6 illustrates the increased level resolution smaller y span after manual zoom in on the y scale File Edit Operate Tools Browse Window Help Leveling Mon Data P a ey Ta i count Phase Dump Rebin A Reff Dups 16 Integrations ae sey D Add SSeS a Be Mode Add all Phases Max FFT Time 100000 000 Wins Save Pro Data requer He Nyquist Car RRRA Since 2GS MEEN 1 rr d oo Fig 6 The upper panel shows a subsection of the bandpass after zooming in on the y scale With this smaller span a more detail view of the bandpass structure is possible 10 The IF FFTS system provides an auto level loop function This loop is applied before every calibration scan to adjust and optimize the input level for the FFTS To control monit
9. or this automatic leveling LabViewMon can be switched to the Leveling display by mouse clicking the selection bar Leveling as illustrated in Fig 7 The optimal input level for the FFTS is reached when the 8 bit ADC is driven by a mean value signal around 75 full scale of the ADC gt Specktrometer vi File Edit Operate Tools Browse Window Help A l Spectra Leveling Fig 7 The Level Display The upper panels are only used for sophisticated debugging purposes Therefore they are not described in this manual The lower panel shows the leveling for the FFTS yellow The chart in the left corner at the bottom line shows that the FFTS level is around 75 ADC full scale which corresponds to an input level of 3 dB 7 FFTS overheating safety The temperatures of the FPGA is given in the upper line of the right column of the spectra section of LabViewMon e g Fig 1 To prevent overheating of the system an idle mode has been implemented Since higher temperatures are limiting the lifetime of the FPGA the chip is switched to idle mode no FFT processing in case the temperature of the FPGA rises above 65 C As soon as the temperature decreases below that level the FFTS can be operated again To safe lifetime of the FPGA it is automatically switched off after 60 minutes of non activity no new CSO FFTS1 START command As soon as a new observation is commanded they are switched on again automatically But note tha
10. t the FFTS then needs another 10 minutes to stabilize 11 8 FFTS shutdown The shutdown procedure for the FFTS is similar to the start up but in reverse order 1 First the FFTS control program is stopped by typing Ctrl C in the active terminal window where this program is running A signal handler will take care that all processes and threads of the FFTS software will terminate properly The final message of the exit handler will inform the user about the correct termination of the software 2 The LabViewMon can be stopped by clicking the exit button To exit the LabView program choose File in the menu bar and exit 3 The VNC viewer is stopped by pressing F8 and selecting exit 4 Now the Linux operating system can be shutdown 5 And finally the PC can be switched off and then the Acgiris FFTS unit 9 Trouble shooting In case of problems the best way to get the FFTS back into operation is to shutdown and then a re start of the whole FFTS system as described in section 4 Since the FFTS was tested and demonstrated to be very stable and reliable please check whether the problem was caused by another instrument before you re start the system In any case please inform Bernd Klein bklein mpifr bonn mpg de about every problem that occur red and re start performed 12
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