LabVIEW control of SPEX HR320 monochromator



LabVIEW control of SPEX HR320 monochromator The PC is configured to communicate with the DataScan2, which communicates with the monochromator. The LabVIEW drivers and VIs for this experiment are found on the desktop of the PC in the folder, isa_user.llb. First, connect DataScan2 to the computer via a GPIB cable and disconnect the HandScan controller, which is used for manual control of the monochromator. Second, verify that the LabVIEW programs are configured correctly by opening “SPECTROMETER SETUP.GBL”. A print out of the front panel should be found on the other side of this sheet. The parameters listed are the specs for the HR320 model which are found in the spectrometer manual, Appendix 1, p. 111. Do not flip the indices (i.e. "index" controls in the VI) as you are using spectrometer with the default index. Third, run "StartUp.vi" which establishes the communication with DataScan and returns the version of the "main" and the "boot" programs in the matrix (column 1, row 1 and 2). If there is an error while establishing your GPIB communication, the red error light will come on. The best solution is to check your parameters in your setup global (see the previous step) or to reboot the DataScan. To calibrate the DataScan, run “Calibrate.VI” and input the current counter position wavelength as indicated on the monochromator dial. To check and see if you have the setup correct, run “Spectral GOTO.VI” and pick a target position near your current counter reading. If everything is setup correctly the number you entered should agree with the counter reading post-scan.Run "HighVoltage.VI" (not HIGH VOLTAGE SETUP.gbl). This VI writes the desired voltage applied to the PMT and returns the value if successful. You should check that the HV1 light on the front of DataScan is on now. The ranges used for this PMT are from 850-950 V, but start with 850 V. Before powering down you will need to set the high voltage back to 0V.Running "Scan.vi" allows you to take scans by inputting a starting and ending wavelength and step size (minimum step size is 0.01 or possibly smaller). The "Auto" setting for gain will probably give you the best possible results. Once you finish a scan the curser function will enable you to obtain information from the graph. Instructions on how to save your file, and how to operate the program are found within the program. Other scan programs exist, such as “ScanDemo.VI”, which are variations on “Scan.VI”, if you feel the need to explore. Try to get the best scan possible with the smallest number of data points (adjust range, step size as well as slit size on the monochromator). Try to restrict your data files to 1000 points or less. Run “Alignment.VI” once you’ve found your peak of interest, which continually records the intensity of the light at a fixed wavelength, allowing you to optimize your signal of interest. ................
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