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| Oscilloscope input noise comparison |
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| _Wim_:
Here is the frequency response of the 20 Mhz BW Limit filter. Setup: Pico FFT with peak hold, CMU200 sweep frequencies between 10Mhz and 60Mhz. |
| MrW0lf:
--- Quote from: _Wim_ on November 02, 2018, 10:03:16 am ---Ok, but now you are suggesting they deliver you a 500Mhz product for the price of a 60Mhz product, I am off course also a fan of that (but would be bad marketing). --- End quote --- But it is not the case. Scope still has unhackable analog bandwidth and FFT plot would drop accordingly. I know of no other (low end) scopes where FFT is artificially crippled like that. AD2 will honestly go to SR/2 so all the others I know of. When using ref compensation one can flatten the plot nicely, but it would be still limited to reduced resolution according to the actual analog bw. So it's not like you suddenly getting more than you paid for. In Pico & FFT case you get less what you paid for if compare to other scopes. But thats OT - it's just a little soft spot suppose - I've hassled a bit too much to overcome various artificial limitations is PS6. To bad it does not have in-GUI scripting like AD2 which is real limitation-killer. Going SDK for each little hack is cumbersome. Edit: So sorry if it did seem I jumped on you, it just "do not give them any more ideas what to limit" reaction :scared: |
| srce:
Here are some results for a Keysight MSOS204A. Vertical: 1mV/div - 8 divisions - 10bit Horizontal: 5uS/div - 20GSa/s - 1Mpts Yellow is 20MHz B/W (s/w filter) - 50 Ohm - 44uV AC RMS - 350uVpp Blue is 2.1GHz B/W - 50 Ohm - 115uV AC RMS - 1.1mVpp 50 Ohm terminators on BNC inputs. 2GHz data 50 Ohm 20MHz data 50 Ohm |
| maxwell3e10:
Thanks, srce, I was looking for data from a high-end Keysight scope. Are these with 50 Ohm impedance, as the screen shot says? Could you also take data for 1 MOhm setting to compare. |
| srce:
Yellow is 20MHz B/W (s/w filter) - 1MOhm - 140uV AC RMS - 1mVpp - 1mV/div Blue is 500MHz B/W (s/w filter) - 1MOhm - 355uV AC RMS - 3.3mVpp - 5mV/div (note b/w is limited to 200MHz at 1mV/div) 20MHz 1MOhm data 500MHz 1MOhm data |
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