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ADS1299EEGFE-PDK: Test signal

Part Number: ADS1299EEGFE-PDK

Hello, 

I'm working on the ADS1299EEGFE-PDK and I am trying to execute the internal test signal explained in section 5.3.1 of the manual. 

- In the Channel Control Register, I have set Channel input = test signal. (figure below)

- I have removed all the jumpers in J6 and JP25. 

It does not work. According the manual I should visualize a square wave, in my case I visualize only a noise signal.(figure below) 

Where's the error? 

Thanks in advance.