Products > Test Equipment
How much noise floor and other things matter in oscilloscope usability
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Performa01:

--- Quote from: 2N3055 on December 29, 2021, 11:55:50 am ---Your thinking:

Siglent that has 5-10X times better noise and performance and sensitivity but cannot measure properly something at 200uV levels,

--- End quote ---

Are you sure? See reply #130 in the following thread ;)

https://www.eevblog.com/forum/testgear/suggestions-for-a-dmm/msg2766948/#msg2766948

Fungus:

--- Quote from: 2N3055 on December 29, 2021, 11:55:50 am ---Rigol MSO5000 cannot measure something properly even at 10mV

--- End quote ---

This, in a thread full of screenshots showing the Rigol measuring things to sub-millivolt resolution with the same accuracy as a Siglent.


Performa01:

--- Quote from: Fungus on December 29, 2021, 06:10:48 pm ---
--- Quote from: 2N3055 on December 29, 2021, 11:55:50 am ---Rigol MSO5000 cannot measure something properly even at 10mV

--- End quote ---

This, in a thread full of screenshots showing the Rigol measuring things to sub-millivolt resolution with the same accuracy as a Siglent.

--- End quote ---
It appears hard to understand for some (well, actually I know only one), but even though the amplitude measurement for the ripple is correct - which doesn't come as a surprise since noise averages out to zero - engineers still want to see the details apart from the very predictable ripple, which includes switching noise and other potential RFI components, as well as any other glitches that might hint on hidden problems with the circuit.

EDIT: And the result is only equal for the Vrms measurement. Has anyone noticed the huge difference in the Vpp measurment, where the noise does not average out to zero?
2N3055:

--- Quote from: Fungus on December 29, 2021, 07:36:42 pm ---
Now let's see if you can understand this:

Imagine I have a sub mV signal for you to look at ... what are you Siglent owners going to do?

--- End quote ---

Now let's see if you can understand this:
Rigol cannot see anything less than 10mV.

Siglent users will see this, with stable triggering:


That's almost two orders of magnitude better.

I rest my case. You're trolling now, nothing else... Stop wasting our time. Please.

nctnico:
R&S owners are equally blessed with low noise  8)



And the option to use a filter on the signal.
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