The GUI doesn't show any signal at all

[SoraUmika]

After successfully installing Linien and having the atomic spectra signal loaded to input 1 I wasn't able to see any signal at all. I am scanning the atomic transition externally and using Red Pitaya's preinstall oscilloscope I was able to see the signal without a problem, but when connected to the Lilnien GUI, nothing shows up on the viewing screen

[SoraUmika]

Not sure if this is a possibility but the software server seems to be checking updates every time it is turned on. However, in our setup, our red pitaya does not have an internet connection. I recalled receiving an error once related to a network issue.

[bleykauf]

If you do not have internet connection on the RedPitaya, you will not be able to install linien-server on it. To check if the server is running, do the following:

Connect via SSH,

ssh rp-f0xxxx.local

on the command line.Then, to check whether the linien-server is running, first confirm that there is a running screen session with the name linien-server by executing screen -ls. If that is the case attach it by running screen -r linien-server. If any errors occurred on the server side, they will be displayed here.

You can also manually run the server with linien-server.

[SoraUmika]

The server is correctly installed and I am running on Red pitaya 2.0 with linien verz =0.7 I received the following warnings upon turning on the server

/usr/lib/python3/dist-packages/scipy/signal/_filter_design.py:1709: BadCoefficients: Badly conditioned filter coefficients (numerator): the results may be meaningless warnings.warn("Badly conditioned filter coefficients (numerator): the " /usr/lib/python3/dist-packages/scipy/signal/_filter_design.py:1083: RuntimeWarning: invalid value encountered in true_divide b /= b[0]

[76839ao]

Dear SoraUmika, Recently, I also encountered a problem similar to yours. When I connected the error signal to input1 of redpitaya, I can't see the signal on the linien GUI. But when I connected the error signal to input2, I can see the signal on the linien GUI. And, when I connected the error signal to input1 of redpitaya using redpitaya's preinstall oscilloscope, I can see the signal. So, this shows that the input1 channel of redpitaya is not broken. Have you solved this problem now? Looking forward to communicating with you.

[SoraUmika]

I haven't fixed it yet, i suspect it might be an issue with the OS, so I will try to downgrade the OS. There is a known working version of red pitaya OS vers 1.04 and Linien 0.5.3 according to another person I know that is using this system. In my case, I can't see either channel 1 or channel 2 signals. I also monitor the output, which is the sweep and modulation output, the sweep does output something but definitely not a sweep and the signal is low, it could be some kind of noise. The modulation signal is just zero despite me tweaking the parameters in the GUI.

Another thing I might also consider trying is to look for the function that reads channel 1 and channel 2 output in linien and see if I can deduce the problem there, but for now downgrading the OS might look the most promising

[SoraUmika]

I fixed it, I should've known this earlier but I believe Linien is running C code underneath, in that case you'll need to download the OS that supports C language system. Its on the official website and choose the one suitable for your board.

[76839ao]

Hello, I have solved the problem. Please make sure that the modulation frequency/amplitude are set to 0.

Thanks.

Ao

在 2023-06-18 08:36:47，"SoraUmika" @.***> 写道：

Closed #337 as completed.

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[bleykauf]

Added a note about incompatability into the master branch (was only in develop) via https://github.com/linien-org/linien/pull/338