Subscription to sample.xiy returns real part only

[thangleiter]

Description

Subscribing the daq module to /devXXXX/demods/X/sample.xiy returns the real part only.

How to reproduce

Take the DAQ example from the documentation and replace the sample nodes:

sample_nodes = [
    device.demods[0].sample.x,
    device.demods[0].sample.xiy
]

Both sample nodes will have exactly the same data.

Environment info

• Python version: 3.13.9
• zhinst-toolkit version: 1.2.0
• LabOne version: 25.10.1.4
• zhinst version: 25.10.1.4

Device/system information (if applicable)

MFLI

[mehdialem]

Thank you @thangleiter for your question, and sorry for late reply.

The suffix xiy alone is not valid. In combination with FFT and other operations like absolute value, it can be used to get two-sided spectrum of the signal via xiy.fft.abs which is |FFT(x+i*y)|. Please look at documentation

To obtain raw x and y components, you can subscribe to device.demods[n].sample.x and device.demods[n].sample.y, then you can make z=x+i*y in post-processing.

[thangleiter]

I see, thanks @mehdialem. In that case I think the current behavior is confusing and it should throw an error rather than silently do something else.