my point was... FFT only can make out half the number of sampled points, the other half is aliased high frequency signals... now this 1Mpoints FFT gwInstek buzzword. is it 1Mpts **FFT points**? or 1Mpts **Sampled Data points**? i guess its marketing hype of 500K **FFT points** only, granted alot more than Rigol's but...

It seems you have zero understanding how FFT actually works, otherwise you'd know about the important relation of frequency resolution, sample rate, number of points, otherwise you wouldn't come up with nonsense about "buzzwords".

Keysight has a nice whitepaper which explains how FFT works:

http://literature.cdn.keysight.com/litweb/pdf/5988-4368EN.pdf?id=1000002181:epsg:apnIn simple terms, the frequency resolution (equivalent to the RBW on a spectrum analyzer) is a function of number of data points and the spacing of the sample points (which is dependent on the sample rate), and it should be very obvious why having only a few thousand points of memory available.

your statement of the rigol being useless is quite an exaggeration as we have tested it to be not the case. and how are you going to show 500Kpts FFT hype on a 800px screen? thats another gotcha's untold mystery.

Yes, you tested something, obviously without any understanding what you're seeing, and like your other comments before this one only confirms that impression.

anyway FFT is just a bundled "gift" out of many others (decoder, save, recording and replay capability etc)

Yes, a gift, I mean it's not that FFT is part of the specification Rigol put out for that scope, is it?

in most cheap range DSO's so i wont mourn much about free bundle in a cheap scope...

What nonsense. FFT is part of the functionality you paid for, like it or not. If you see this as a "gift" then all that means you're really easy to pull a fast one on. More fool to you.

one should buy dedicated device if its too important

Or a better scope that has implementations of the required functionality that isn't crap.

last point... GDS2104 1Mpts FFT hype and better decoding capability is not without cost

No-one said it isn't, so I don't know what your point is. The thing is even a scope that at $400 is a great bargain is still worth nothing if you need the functionality that in that scope is implemented so poorly as to be useless.

I have to agree with nctnico, you sound like a rabid Rigol fanboi.