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Update Running the PAS

alphonse 2025-04-06 01:02:57 +00:00
parent 59cc801cd6
commit 0496b65874
1 changed files with 6 additions and 3 deletions
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Running-the-PAS.md

@ -9,8 +9,9 @@ A separate script performs a frequency sweep and can be run prior to the start o
# Turn on the PAS
1. Plug the USB cable into the host computer if needed.
1. Turn on or plug in the 12V power supply (you may also need to press the soft on/off button if using the Rigol bench supply).
2. Ensure the microphone preamp is receiving +/-3.3 VDC using a multimeter. If not, adjust the trimpot on the voltage regulator until the supply reads +/- 3.3 VDC. **Do not exceed 3.6 VDC or you will destroy the microphone and the preamp board will have to be replaced!**
1. Plug the sound card into the host computer, if needed, and make sure the the BNC cable is connected to the signal output on the PAS.
1. Turn on or plug in the 12V power supply.
2. Turn on the +3.3 V and -3.3 V supplies (you may also need to press the soft on/off button if using the Rigol bench supply). **Do not exceed 3.6 VDC or you will destroy the microphone and the preamp board will have to be replaced!**
# Open the Real-time Plots and/or Save Data
@ -40,10 +41,12 @@ A separate script performs a frequency sweep and can be run prior to the start o
*If you get an OS/serial port error try starting the program a couple more times. If it still won't start, reset the serial devices by unplugging their USB cables and plugging them back in. Also make sure the devices are not in use by another program.*
3. If you need to turn off individual lasers or need to manually change the modulation frequency, you can do so via the serial port. See the Laser Controller documentation for more details.
# Perform a Frequency Sweep
1. Fill the cell with a constant concentration of absorbing gas and let the signal stabilize.
2. Set the start (`f1`) and stop (`f2`) frequencies and ensure the `pas-sweep.jl` script is set to save the data file. This can be done with any text editor, or by issuing `nano ~/pas-sweep.jl` in the Terminal. Note that each frequency takes approximately 2 seconds.
2. Set the start (`f1`) and stop (`f2`) frequencies and ensure the `pas-sweep.jl` script is set to save the data file. This can be done with any text editor, or by issuing `micro ~/pas-sweep.jl` in the Terminal. Note that each frequency takes approximately 2 seconds.
```julia
f1 = 1190