RA16PA Tech Notes TN0217 Using RZ processors, BioAmp input appears clipped or larger than expected TN0103 3 kHz noise masks neural activity TN0067 Some RA16PA and RA4PA generate a 3 kHz noise that masks neural activity TN0256 Running a Medusa PreAmp off an external battery TN0245 Preamplifier clipping indicators light when signal input voltage is below the input range