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FMCG/Data Acquisition with LabVIEW Software: Difference between revisions
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FMCG/Data Acquisition with LabVIEW Software (view source)
Revision as of 16:13, 25 August 2016
, 25 August 2016→DC-SERF mode data acquisition
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## '''Chirp Iterations''' sets the number of calibration chirps sent to each magnetometer during the calibration. The responses to these chirps are averaged when calculating the response. Historically we have used '''5''' chirps for this purpose.
## I'm not 100% sure what '''Calib Freq Max''' does, but I think it should be set equal to the Downsample frquency, or '''1000 Hz'''.
# That's all the setup for now! Click the '''Run''' arrow to start the program.
# The first prompt you'll see is one asking whether the heater PID circuit has been disabled. This is a relic of a previous-generation heater circuit, so you can ''always'' click '''Yes''' here.
# The next couple of prompts will ask the user to calibrate the device. If a calibration run has been completed already that day, the sequence will first ''ask'' the user if they'd like to ''re''-calibrate the sensors. However, if it's the first time the program has been run that day, the calibration ''must'' be done before proceeding.
## The first prompt will tell you to calibrate the '''OPAMP_Y'''. During this stage of the calibration, the calibration chirp will be applied to the coil current supply circuit, and the '''monitor''' voltage from that circuit will be read. First, ensure on the main box that the '''Z-Mode''' switch is set to '''OFF''' and the '''Chirp''' switch is set to '''Y'''. Now, on the the FPGA breakout box, flip the switches under the green FPGA monitor BNC ports '''UP'''. This will connect the FPGA input to the monitor output on the Y current supply. Once this is done, click '''OK''' on the LabVIEW prompt and the sequence of 5 (or whatever you selected) chirp signals will be applied sequentially to the current supplies and the circuits' responses will be recorded.
## The next prompt will tell you to calibrate the '''MAGNETOMETER_Y'''. The chirp will be applied to the same current supply, except now the FPGA input should be connected to the magnetometer signals from the photodiodes (via the I-V converters). Flip the switches below the green ports '''DOWN''' to make that happen. Then click '''OK''' on the prompt. You should see the chirp signals appear on the scope. If the chirp signals are too large or a DC field has caused the magnetometer signal to swing such that the output rails during the calibration, it will have to be redone later. For now, just assume that it went fine.
## Lastly, a '''Noise/Heartbeat Measurement''' prompt will show up. No further switching is necessary (besides maybe adjusting the room or coil fields) before hitting '''OK'''. A time series of length '''Run Time''' will be collected.
# When the time series has been collected, the progress bar will be completely lit up and the message '''DONE''' will flash above it. Collection complete!
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