thank you very much tautech for the screenshots.The FFT looks same on both scopes and since 1000x is only 16k bins maximum while x-e is 1 million,it looks like x-e was set to 16k bin instead of its maximum.Could you please compare both with same settings,3 bit eres,no averaging and 1000hz square wave,with only difference that the new x-e will have the maximum fft bins enabled.