ADS1299EEGFE-PDK: Noise Measurement of Channel Inputs

Tool/software:

QUESTION1

 I'm trying to check the noise of my EEG electrodes in a single-ended Input configuration with a common negative reference.  I have followed the configurations- Are they correct? :

• The signal electrode is connected to J6.36, J6.32.  The rest of the jumpers in J6 are open.
• Bias Electrode connected to JP25.2
• REF ELECTRODE connected to JP25.6
• JP6: Open ; JP8[1-2] are shorted; JP7 [2-3] are shorted;  JP1 [1-2] are shorted ;
• Providing Unipolar Supply ( JP2 [2-3] are shorted, JP20 [1-2] are shorted)
• DVDD = 3V (JP24 [2-3] are shorted)

GUI Config:

• CONFIG3[3:2] = 11b
• SRB1 of MISC1 =1
• 500 SPS, PGA = 24
• BIAS and LEAD OFF are all off for all electrodes.
  

QUESTION2

I have tried out the methods in Section 8 (https://www.ti.com/lit/ug/slau443b/slau443b.pdf?ts=1723762924092&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FADS1299EEGFE-PDK). Please confirm configurations and the results I got are correct: 

1. 8.1 On-Chip (ADS1299) Input Short  --
   1. Configurations: J6- open, JP6[1-2] , JP7[2-3] , JP8[1-2] , JP25[3-4][5-6] , JP2[2-3] ,JP20[1-2] ,
   2. SRB1=0 ,PGA=24, Input Short , 500sps 5000pts
   3.  Observed VPP= 1.5uV , Offset = 18.6uV , Magnitude ~ -150dB from 0-250Hz
      
      

2. 8.2 External Input Short with 5K Resistor --

   1. Configurations: J6 - jumpers connected, JP6[1-2] , JP7[2-3] , JP8[1-2] , JP25[1-2][2-3] , JP2[2-3] ,JP20[1-2]
   2. SRB1=0 , PGA=24 , Normal Electrode, 500sps 5000pts
   3. Observed VPP= 1.72uV , Offset = 22 uV, Magnitude ~ -150dB from 0-250Hz
      
      
3. 8.3 Noise with Common Reference on Negative Inputs  --- 
   1. Configurations: J6 - jumpers connected, JP6[1-2] , JP7[2-3] , JP8[1-2] , JP25[3-4][5-6] , JP2[2-3] ,JP20[1-2]
   2. SRB1=1 , PGA=24 , Normal Electrode, 500sps 5000pts
   3. Observed VPP= 1.56uV , Offset = 18.6 uV, Magnitude ~ -150dB from 0-250Hz
   
   
   
4. 8.4 Noise with Buffered Common Reference Input. -- 
   
   1. Configurations: J6 - jumpers connected, JP6[1-2] , JP7[1-2] , JP8[2-3] , JP25[1-2][2-3] , JP2[2-3] ,JP20[1-2]
   2. SRB1=0 , PGA=24 , Normal Electrode, 500sps 5000pts
   3. Observed VPP= 1.45uV , Offset = 18.6 uV, Magnitude ~ -150dB from 0-250Hz