LabVIEW Control Software for ATF Holography Receiver
Contents
1. 4 User Interface GUI 4 1 The user interface consists of a main window with five tabs named from left to right Settings DSP Graphs Temp Graphs Distance measurement and I O Interface see Figure 1 Settings DSP Graphs Temp Graphs Path length measurement I O Interface Figure 1 Settings tab This is the main tab used for controlling the Holography receiver and it s divided in six sub panels as described below The tab also has a Stop button to stop the software and all CAN communication is terminated properly when using it Detailed description about all Monitor and Control commands can be found in the Holography Receiver ICD RD 1 4 1 1 Attenuator Control Both Signal and Reference channel attenuators are controlled from this panel The valid range is 0 63dB in step of 1dB On power up these attenuators are set to 0 dB by default in the Holography receiver To enable the controls the Enable Control button has to be activated There are two green indicators for the power level of the IF and Ref channel When lit there is enough power When any of the two attenuator values are changed the corresponding red indicator will flash to indicate that the command has been sent see Figure 2 Attenuators E IF Sufficient power GM Ref Sufficient power J Enable Sig Control MB Sending Sig data J Enable Ref Control MB Sending Ref data Sig Attenuatio2. 42 02 00 00 002 A MAN Date 2006 08 31 Status Draft LabVIEW Control Software for Draft Pending Approved Released Superceded Obsolete ATF Holography Receiver Page 8of 14 4 1 4 Signal Levels Figure 5 shows the signal level panel Mark the parameter you want to monitor in the check box next to the indicator The update interval in ms can be set in the Update interval control The shortest interval is 125 ms Default is 250 ms Signal Levels Update interval ms 250 4 JV Enable Status readout LO level wJ 0 00 m REF I channel l 0 00 IV REF IF level dem 0 00 Iv REF Q channel vp p 0 00 W Signal IF level dem 0 00 v SIG I channel p p 0 00 IV SIG Q channel Vp p 0 00 IV Figure 5 Signal Levels Full scale readouts for Signal and Reference I and Q channels are 20V For best performance you will need as much power as possible on the Reference and Signal channel without saturating the receiver 75 95 of full is a good level to aim for Nominal values for LO level is 1 77V for High band and 1 55V for Low band operation No signal indicates the Gunn Oscillators have failed or that they are not biased properly 4 1 5 Environmental Data This panel shows internal temperatures and power consumption of the Holography receiver Readouts have to be enabled with the Enable check box Temperature data can be logged to file and plotted to screen with an interval set by the Int
3. Any deviation indicates that the 25MHz and 48ms signals are not phase locked ALMA Project LabVIEW Control Software for ATF Holography Receiver Doc ATFD 42 02 00 00 002 A MAN Date 2006 08 31 Status Draft Draft Pending Approved Released Superceded Obsolete Page 10 of 14 4 3 4 4 4 5 Settings DSP Graphs Temp Graphs Path length measurement I O Interface Waveform Chart 1 000000 0 900000 0 800000 4 0 700004 0 600000 0 500000 4 0 400004 0 300000 0 200000 2 0 100000 2 0 000000 0 100000 3 0 200000 0 300000 5 0 400000 4 0 500000 0 6000004 0 7000004 0 800000 0 300000 3 DSP data Samples to average do Bel I Read number of samples Number of samples 0 00 to Figure 7 DSP plot Temp Graph tab Displays the internal temperatures of the Holography receiver Temperatures inside the receiver can be expected to be 20 deg C above ambient temperature during operation Path length measurement tab Takes the raw data from the DSP and calculates the path length difference between Signal and Reference channel in pm T O Interface tab Used for starting and stopping communication to the Holography receiver This is also where the user can select to use direct CAN communication or use CAN over Ethernet ALMA Project Doc ATFD 42 02 00 00 002 A MAN Date 2006 08 31 Status Draft LabVIEW Contro
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5. Atacama Large Millimeter Array ATACAMA LARGE MILLIMETER ARRAY LabVIEW Control Software for ATF Holography Receiver ATFD 42 02 00 00 002 A MAN Version A02 Status Draft Pending Approved Released or Obsolete 2006 08 31 Prepared By Name s and Signature s Organization Date Christian Holmstedt NRAO 2006 08 22 Approved By Name and Signature Organization Date Released By Name and Signature Organization Date ALMA Project Doc ATFD 42 02 00 00 002 A MAN Date 2006 08 31 Status Draft LabVIEW Control Software for Draft Pending Approved Released Superceded Obsolete ATF Holography Receiver Page 2of 14 Change Record Version Date Affected ae Request Reason Initiation Remarks _ 2006 08 22 Initial draft A02 2006 08 31 43 52 i Added expected operating temps Modified tuning sequence 2006 09 05 4 1 4 Added nominal values for LO level ALMA Project Doc ATFD 42 02 00 00 002 A MAN Date 2006 08 31 Status Draft LabVIEW Control Software for Draft Pending Approved Released Superceded Obsolete ATF Holography Receiver Page 30f 14 Table of Contents I INTRODUCTION ra aaa Seagate een geccta seaweeds ocarauadient idkar iare ASETA RE sa EAS 4 2 REFERENCE DOCUMENTS arena eee 4 3 INSTALLATION AND SETUP eisiea iiai E E REE 4 4 USERINTERFACE GUI an e e a a E EES 5 4l Settings abannen a
6. ablished Enable all controls on the Settings tab DSP readout and plotting can be activated at this point 3 Select High Band Gunn 4 Set synthesizer frequency to 9445 000 MHz 5 Check if synthesizer is locked Synthesizer sub panel Abort sequence if not locked The most likely reason is that the 25 MHz signal is missing 6 Set the PLL to run in Open Loop 7 Set GunnH Loop Gain to 1992 1875 ohm 8 Set PLL Tune Range H to 19921 875 ohm 9 Turn on Gunn Bias by pressing Bias On Off 10 Set High band Gunn Bias to 9 365234 Volt Verify that Gunn is biased 11 Set PLL to run in Closed Loop 12 Check that the Gunn Oscillator is locked The indicators should be lit PLL Gunn sub panel 13 Adjust Signal and Reference attenuators until a good signal level 75 of full scale Higher is better for maximum dynamic range just make sure the hardware is not saturated can be seen on the REF and SIG I and Q channels on the Signal Level sub panel 14 Check that the DSP is working by going to the DSP Graph tab Check that the Number of samples reads back a decimal value of 600 A stream of data should be present on the screen If all readouts are flat lines or no data ALMA Project Doc ATFD 42 02 00 00 002 A MAN Date 2006 08 31 Status Draft LabVIEW Control Software for Draft Pending Approved Released Superceded Obsolete ATF Holography Receiver Pa
7. at the 25 MHz signal is missing 6 Set the PPL to run in Open Loop on the PLL Gunn sub panel 7 Set GunnL Loop Gain to 1992 1875 ohm ALMA Project Doc ATFD 42 02 00 00 002 A MAN Date 2006 08 31 Status Draft LabVIEW Control Software for Draft Pending Approved Released Superceded Obsolete ATF Holography Receiver Page 13 of 14 8 Set PLL Tune Range L to 50000 ohm 9 Turn on Gunn Bias by pressing Bias On Off 10 Set Low band Gunn Bias to 9 09668 Volt Verify that the Gunn is biased 11 Set PLL to run in Closed Loop 12 Check that the Gunn Oscillator is locked The indicators should be lit PLL Gunn sub panel 13 Adjust Signal and Reference attenuators until a good signal level 75 of full scale Higher is better for maximum dynamic range just make sure the hardware is not saturated can be seen on the REF and SIG I and Q channels on the Signal Level sub panel 14 Check that the DSP is working by going to the DSP Graph tab Check that the Number of samples reads back a decimal value of 600 A stream of data should be present on the screen If all readouts are flat lines or no data can be seen press Reset DSP on the DSP Data sub panel on the Settings tab When changing Signal and Reference attenuation the SS and RR data shall move up and down accordingly Tuning the High band 1 Make sure CAN communication has been est
8. check box needs to be checked to send commands To lock the Gunn a Gunn Bias Loop Gain and PLL Tune Range needs to be entered This can be done manually or by loading previously used values from file Default values for both High and Low band Gunn can be found in Table 1 PLL f Gunn EE Gunn Osc locked Enable Gunn PLL Control GE Sending Gunn PLL data Gunn select Low Band Gunn z J Bias Onfoff PLL Mode j Open Loop 7 Low band Gunn Bias 8 999 a High band Gunn Bias 9 199 a Monitored value Y 0 00 Monitored value Y 0 00 Gunn Loop Gain 0 10 kohm 0 000 GunnH Loop Gain 0 10 kohm 1992 187 PLL Tune Range L 0 50 000 ohm 0 000 PLL Tune Range H 0 50 000 ohm 19921 6875 E Load Default Parameters Load Default Parameters Save Values as Default Save Values as Default Figure 4 PLL Gunn control The High or Low band Gunn Oscillator is selected with the Gunn select control When switching between the two Gunn Oscillators the bias voltage is disabled and the Gunn put in Open Loop operation i e the PLL loop is disabled and needs to be manually turned on Basic tuning of the Holography receiver is described in sect 5 2 Gunn Oscillator Low High Synth freq MHz 8755 9445 Gunn Bias V 9 09668 9 365234 Loop Gain ohm 1992 1875 1992 1875 PLL Tune Range ohm 50000 19921 875 Table 1 Default Synth PLL Gunn parameters ALMA Project Doc ATFD
9. der Win98 but it has not been tested The software controls the electronics using the CAN Interface or by tunneling the CAN commands through Ethernet using TCP IP communication In the latter case a script is running on the ABM The software is distributed in two versions a compiled stand alone version and the source code The latter needs a full LabVIEW license to run It was developed using LabVIEW 7 but the source code will compile under newer versions too This document will focus on the stand alone executable The document does not describe the low level communication protocols used and is intended to be a User Manual including basic tuning procedures for the receiver 2 Reference Documents RD1 Interface Control Document between ATF Holography Receiver and Control Software ALMA 42 02 00 00 75 35 25 00 A ICD 3 Installation and setup The software needs drivers for a National Instruments CAN Interface to run Make sure NI CAN 1 6 or later is installed before the Control Software is installed The Installer creates an entry under the Programs menu accessible from the Start menu just like any other Windows program Start the program by clicking Start gt Programs gt Full Holography test Dual Interface 1 0 2 ALMA Project Doc ATFD 42 02 00 00 002 A MAN Date 2006 08 31 Status Draft LabVIEW Control Software for Draft Pending Approved Released Superceded Obsolete ATF Holography Receiver Page 5of 14
10. erval control To log data to file the Plot temp data must be enabled together with Log temps to file Temperature graphs are shown on the Temp Graphs tab see 4 3 ALMA Project Doc ATFD 42 02 00 00 002 A MAN Date 2006 08 31 Status Draft LabVIEW Control Software for Draft Pending Approved Released Superceded Obsolete ATF Holography Receiver Page 9of 14 4 2 Environmental Data JV Enable Environmental Data Supply Current A 0 00 Power Supply C 0 00 Signal Mixer C 0 00 Plot temp data Reference Mixer C 0 00 T Log temps to file Interval s 60 29MHz OCxO C 0 00 Path i 95MHz OCXO C 0 00 Lock Box C oo Figure 6 Environmental Data Nominal supply current during operation is 1 3 to 1 4A depending on ambient temperature DSP Graph tab Plots the raw data from the DSP channels QQ QR QS RR RS SS on screen normalized to 1 full scale Select what data to plot with the check boxes Averaging can be applied by entering the number of samples to average in the Samples to average control and turning averaging ON The SS signal is directly proportional to the power level in the Signal channel and RR is directly proportional to the power level in the Reference channel The indicator Number of samples shows the number of samples in each 12ms integration cycle This number should be identical for each cycle and the correct reading is 600
11. f 14 5 2 If everything is OK the message looks like this Program running Do not turn off power to Holography Rx CAN node with address x1D found at node index xnn S N nn nn nn nn nn nn nn nn CAN node with address x1C found at node indes xnn S N nn nn nn nn nn nn nn nn Before the software can be closed the user has to disconnect from the CAN bus Not doing so will leave the bus open and this can cause problems when connecting again Press Disconnect from CAN bus to close the connection The following message is displayed Program running Communication with CAN bus closed It is now safe to turn off power to the Holography Rx Basic Holography Rx tuning The Holography works on two frequency bands 79GHz and 104GHz called Low and High and there are two presets that will tune the receiver to those two frequencies The tuning operation is described below The Holography Receiver can be tuned 150 MHz relative to the two primary frequencies by setting the synthesizer frequency Minimum step size for the synthesizer is 125 kHz Tuning the Low band 1 Make sure CAN communication has been established Enable all controls on the Settings tab DSP readout and plotting can be activated at this point 3 Select Low Band Gunn 4 Set synthesizer frequency to 8755 000 MHz 5 Check if synthesizer is locked Synthesizer sub panel Abort sequence if not locked The most likely reason is th
12. ge 14 of 14 can be seen press Reset DSP on the DSP Data sub panel on the Settings tab When changing Signal and Reference attenuation the SS and RR data shall move up and down accordingly Depending on ambient temperature and temperatures inside the Holography receiver the Gunn Bias voltage might have to be tweaked a little bit up or down to get the Gunn oscillators to lock The settings can be saved or recalled from file by pressing the corresponding Load and Save button for the either the high or low band Gunn
13. l Software for Draft Pending Approved Released Superceded Obsolete ATF Holography Receiver Page lof 14 5 Controlling the hardware 5 1 Connecting and disconnecting to the CAN bus Before any communication with the hardware can be done the bus has to be scanned for connected CAN nodes CAN communication can be done with either CAN direct using a local CAN interface or by tunneling CAN commands over Ethernet Detected CAN Nodes Program running Press Scan amp Connect to CAN bus to continue Scan amp Connect to CAN bus Disconnect From CAN bus Figure 8 CAN Connect Disconnect Figure 8 show the message before the bus has been scanned Press Scan amp Connect to CAN bus to find the two nodes of the Holography Rx on the bus If no connection has been established a NOT FOUND error will be displayed The holography receiver uses two CAN nodes Node 1 is used for the DSP unit and shall have an address of 0x1D Node 2 is used for all other monitor and control points and shall have an address of Ox1C The message looks like this if no nodes are found Program running Do not turn off power to Holography Rx CAN node with address x1D NOT FOUND CAN node with address x1C NOT FOUND ALMA Project Doc ATFD 42 02 00 00 002 A MAN Date 2006 08 31 Status Draft LabVIEW Control Software for Draft Pending Approved Released Superceded Obsolete ATF Holography Receiver Page 12 o
14. n 20 4 dB Ref Attenuation 20 dB Figure 2 Attenuator control ALMA Project Doc ATFD 42 02 00 00 002 A MAN Date 2006 08 31 Status Draft LabVIEW Control Software for Draft Pending Approved Released Superceded Obsolete ATF Holography Receiver Page 60f 14 4 1 2 Synthesizer Control The synthesizer frequency and status are shown on this panel The frequency in MHz is entered and sent immediately to the synthesizer when the Enable Control check box is checked A red indicator will flash every time a new command is sent A green light indicated when the synthesizer is locked The default frequency for operating the Low band is 8755 MHz and for the High band 9445 MHz Synthesizer GME Synthesizer locked J Enable Synth Control Synthesizer freq MHz 8730 000 lt j EE Sending Synth data Figure 3 Synthesizer control For High band Frr 104020 MHz the synthesizer frequency is Fyyntth Frr 95 Fir N Fr 30 MHz N 11 For Low band Frr 78920 MHz the synthesizer frequency is Fyynth Frr 95 Fp N Fr 30 MHZ N 9 ALMA Project Doc ATFD 42 02 00 00 002 A MAN Date 2006 08 31 Status Draft LabVIEW Control Software for Draft Pending Approved Released Superceded Obsolete ATF Holography Receiver Page 7of 14 4 1 3 PLL Gunn control Figure 4 shows the PLL and Gunn control panel The Enable Control
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