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Regarding problem in changing the gain on the ADS1299EEG-FE PDK

To whom it may concern

During the test with ADS1299EEG-FE PDK, I faced another problem about gain setting.

I applied the 30Hz sinusoidal voltage with 300uVp-p to the PDK and tried to change the PGA Gain on the GUI to obtain different amplified waveform.

However, I found only 500uVp-p waveform on the Scope window in Analysis session even though I set the all PGA gain, from 1 to 24. 

The measured waveform remained constant. There was no change at all.  

What should I do to correct this problem? Please give me some tips to fix it. 

Following pictures are the captured images of the GUI with the current settings.

The last picture is the resultant waveform; its amplitude is about 500uVp-p and its frequency is 30 Hz.

I am looking forward to seeing your answer.

Thanks!!!