WAtoMA

Hello all, I am trying to update a very old spectrometer to a digital interface. The signals coming from the instrument consist of two signals. One, is a constant analog pulse--which starts at a reference frequency (0) and then every pulse counts as another nanometer or wavenumber. The other signal varies from 0 to 100mV and represents the intensity (of the y-axis) at each respective wavenumber. I am trying to couple the two signals. The pulse signal (input PFI 0 / AI START) should tell the program when to sample the other, varying signal (currently not varying for testing purposes .22V) in input AI0 . So the first pulse should represent wavenumber 0 and sample the other signal (at whatever variation it is in the respective range). The next pulse should represent wavenumber 1, and sample the other signal (at whatever variation it is in the respective range).....and so on. I have both PCI-6251 and PCI-6220 boards. The Raman Spectrometer is an old 70's SPEX model. I have attached my current program in progress. When I hook up a function generator on a burst pulse sequence to the PFI 0 / AI START input in the Trigger / Counter section (100Hz) and a 9V battery with a resistor (.22V) to the AI 0 Input on my board,.....I get analog data starting to appear in my array, yet no graphing and no accompanying data in the Counter data 2 array. What am I doing wrong? I am new to labview and am a chemist by trade. Am I hooking up the signals correctly to the proper inputs? Is my software code flawed? Help please. Real Raman VI 2.vi

Hello all, I am a grad student in chemistry. I am in the beginning stages of understanding/utilizing Labview 6.0. My objective is to try and update a very old Raman Spectrometer from a stepper motor driven chart recorder to a digital interface using Labview. What I know of the signal that is received from the instrument is: There are two signals. One is a constant steady state signal giving me a constant pulse from a point of reference (which needs to be user defined). This will define my x-axis in wavenumbers. The other signal is a variation signal received from a Photomultiplier tube. This signal is a voltage difference which correlates to a given intensity on my y-axis. The VI's which I have been investigating for this purpose are of the Pulse train category. Can anyone tell me if I am on the right track? Will the typical Generate Pulse Train.vi from the counter palette serve the needs of my project. I'm assuming I need to use an analog input vi. Would AI Aquire Waveforms.vi be the one I need....since I am acquiring multiple signals? Does anyone have any tips or has anyone encountered a similar project?

Hello, I am a first time LabVIEW user. I need to construct a VI to interpret Analog pulses from an old Raman Spectrometer. I am using an NI DAQ model # BNC-2110. I am thinking of constructing a 3 window system. One for specified wavelength user input, another for laser alignment calibration, and one for the spectra display/results. Can anyone tell me where I should start?