SDS800x HD vs DHO800x FFT

[tautech]

At 200us/div and max 2Mpts FFT a sweep speed of ~1/s is obtained.
100us/div = ~2/s
50us/div = ~4/s

Rigol is three or four times faster than that.

These results are only applicable to the scope settings in use. FFT 2Mpts remained unchanged although it's auto managed by the scope. Memory depth is just what it was, didn't check.
Higher FFT sweep speeds are likely possible if one takes the trouble to optimize them.

Pick your poison, speed or accuracy.

[2N3055]

To be honest, only scope in less than 7000-8000 € range that has something resembling realtime SA is GW-Instek MDO-2000A series.
And that is because it literally has realtime SA mode implemented. It works well but it's ADC are only 8 bit so limited dynamic range. Also scopes are in 1500€ ranges, a bit old fashioned by now etc.....

All other scopes in that price range will have only FFT as a math function, with implementation variations.
Short version for the two scopes mentioned:

- if you want just something bouncing on the screen to see if there is something happening at some frequency, DHO800 will have faster refresh at some settings.
- if you want control of what are you measuring, accurate windows, accurate level measurements, Peak Hold and Averaging, various markers and peek markers and control of them, then SDS800xHD is the one.

If you want SA display on your scope that resembles R&S MXO4 or MXO5 or Tektronix MSO 6 digital down conversion tech, you will have to pay for those...

[tautech]

To be honest, only scope in less than 7000-8000 € range that has something resembling realtime SA is GW-Instek MDO-2000A series.
And that is because it literally has realtime SA mode implemented. It works well but it's ADC are only 8 bit so limited dynamic range. Also scopes are in 1500€ ranges, a bit old fashioned by now etc.....

..........

Which buys a SSA3021X Plus with dedicated EMI mode.

See Reply #8

[Fungus]

As I have mentioned before, FFT sweep speed is related to the settings you use, just as they are for an analyzer.

Yes, but one can still be slower than another.

Which one wise guy ?

That's what we're trying to establish here, not just to sell Siglents.

[Fungus]

various markers and peek markers and control of them, then SDS800xHD is the one.

The Rigol shows peaks, etc.