GW Instek - The comparison of FFT Function, Digital Oscilloscope GDS-1000B vs DS-1000Z 

Very interesting for the FFT: I don't intend to be overly critical of the scope because it's not a dedicated spectrum analyzer, however, with the demo you did not mention whether the scope can indicate the actual frequencies numerically on-screen: Theoretically we know that a square-ware has only odd harmonics up to infinity and that a sine wave has zero harmonics - that's theory. However, in the real world such is not the case because we might not know the nature of the waveform and any of it's harmonics. For example, the demo using the 1 khz. square wave, showing that it has a number of harmonics is certainly revealing compared to the Rigol scope on the left, but it's not enough, at least as far as the demo is concerned. Any scope that does an FFT needs to be able to indicate numerically the actual frequencies of the fundamental and any harmonics it is showing otherwise it's just a pretty picture and essentially a useless FFT. From a marketing standpoint it's great that a low-cost scope can do an FFT but if the FFT is essentially useless (for the reasons cited) then what's the point of doing the FFT at all? (Check out Jack Ganssle's review of the GDS-1052B oscilloscope (ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-33rN8r9H9tg.html) scope where he tests the FFT and mentions that it's essentially useless.) However, no question this is a great entry-level scope if you don't need a solid FFT function.

how can we find the frequencies from the FFT ?

You should do a more clean design, this news models are going in the wrong direction in terms of design when compared with the GDS-1000A-U series!

why u dont make 1052 b .... is this a fair test....