I am using the zero-dB level to offset the zerodB setting in the INI file.
I need the offset both to convert to spectral density function (noise/Hz) but also for phase noise measurement calibration. I need to offset up to 80 to 100dB (ie 10 to power 4 or 10 to power 5 in volts).
Is there a maximum number for this. I managed to get the measurement at the bottow of the scale to -160dB but need a little lower. I don't need resolution I just need more powers of 10 (eg 1.8E9) and it seems to ignore more beyond a certain limit. The problem is that it is in microvolts which immediately adds 10 to the power 6 and it does not seem to allow one to add more than around 10 to the power 8 or 9. Is there an exponent form to express the number of zeros ( ie 1.8E9)?
Also should the zero dB reading be the same when nothing is added in the ini file and when 10 to the 6 is added. They seem slightly different. Is this an rms to peak conversion?
Has the number of samples when using 4096 been corrected yet. ref my last post.