How to change calibration distance using a .cu3 file (no .cu3s available)?

[polanco06]

Hi,
I’m trying to change the calibration distance in a .cu3 file, but I’ve run into an issue. The example I’m following uses a .cu3s session file, but in my case, I only have the .cu3 file.

When I try to run the program with my .cu3 file, I get the following error:

SessionFile file does not exist

I would like to ask:

Is there a way to directly modify the calibration distance in a .cu3 file?

Is it possible to generate a .cu3s file from a .cu3 file without having to recapture the data?

Are there any tools or scripts available to perform this conversion or edit?

Any help or guidance would be greatly appreciated.

Best regards,

[birkholz-cubert]

Hello,

to load a legacy .cu3 instead of a .cu3s file you would change the code from

  session = cuvis.SessionFile(measurementLoc)
    mesu = session[0]

to

mesu = cuvis.Measurement(measurementLoc)

You can also reprocess .cu3 measurements into .cu3s files using the cuvis_batch_exporter

cuvis_batch_exporter -i /some/path/to/cu3/files -r  -o /some/path/out CUBE

If you encounter any issues regarding the usage of sdk please let me know.

[juhyc]

Hi,

I am experiencing the same issue.

I only have .cu3 files, but no corresponding .cu3s files. When I try to run Python example 1, I attempt to create a calibration object directly from a .cu3 file using:

calib = cuvis.Measurement("path/to/file.cu3")
acq = cuvis.AcquisitionContext(calib)

However, this results in the following error:

ERROR:root:("Could not interpret input of type <class'cuvis.Measurement.Measurement'>.",)

In a previous response, cuvis_batch_exporter was mentioned as a way to convert .cu3 files into .cu3s. Could you clarify:

What exactly is cuvis_batch_exporter?

Is it the officially recommended way to generate .cu3s files from .cu3 measurements?

How should it be used (CLI command or workflow example)?

Any guidance on the correct workflow for using .cu3 data with the Python SDK would be greatly appreciated.

Thanks,

[birkholz-cubert]

Hello,

so a .cu3 file (corresponding to a cuvis.Measurement object) is a single Measurement, and also mainly a legacy format. For this no additional Calibration information is saved.
Therefore it is not equivalent to to Calibration object. The new format .cu3s (corresponding to a cuvis.SessionFile object) can contain multiple and also has the Calibration info embedded. So for creating a cuvis.AcquisitionContext without .cu3s file you would create a Calibration object like this:

calib = cuvis.Calibration("/directory/containing/init.daq")

About your other questions:

What exactly is cuvis_batch_exporter?

• if you have access to our full (paid) software suite this a cli tool that is included there

Is it the officially recommended way to generate .cu3s files from .cu3 measurements?

• the officially recommended way is to directly save your measurements to .cu3s files and skip the legacy format entirely