shfsg/python/example_rabi.py, change variance of gaussian

[nyuvlab]

In shfsg/python/example_rabi.py, I can only see the center frequency in the parameters, but how to change the variance of gaussian?

[mehdialem]

In shfsg/python/example_rabi.py, I can only see the center frequency in the parameters, but how to change the variance of gaussian?

The waveform is defined in the SequenceC file "Rabi.seq" in the same directory as the example. The line that defines the gaussian waveform is:

labone-api-examples/shfsg/python/Rabi.seq

Line 16 in 83e4da6

wave w = gauss(s_len, amp, s_len/2, s_wid);

To learn how the AWG sequencer code works, please read the user manual of SHFSG, in particular for the SequenceC commands: https://docs.zhinst.com/shfsg_user_manual/functional_description/awg.html

[nyuvlab]

Thanks. When we run \shfsg\python\example_rabi.py DEV12513 --interface USB -r 4 with different s_len of Rabi.seq, we didn't see any change of the wave. Also, it looks like the generated wave is always a 4.1GHz sine wave without modulation. Do you have any hint about this problem?

[mehdialem]

I see two points here:

• To adjust the width of gaussian waveform, you need to change the corresponding line const t_wid = 50e-9; in the sequencer file "Rabi.seqc" which is currently set to an RMS width of 50 ns.
• Regarding the continuous sine, it seems that the SHFSG hasn't started with its default state. You can either set it to the default in the "Device" tab of LabOne GUI, or apply the API command daq.setInt('/dev.../system/preset/load', 1)