Forums › SA Series Discussions › Power Spectral Density Measurement Discrepancy? › Reply To: Power Spectral Density Measurement Discrepancy? September 17, 2015 at 12:18 pm #59267 AndrewModeratorMike, please call me at 1-800-260-TEST Ext 2 so we can work through the discrepancy. I’m available between 9-3 PSTRegards, A.J. This reply was modified 11 years ago by Andrew.