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How much noise floor and other things matter in oscilloscope usability
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nctnico:

--- Quote from: Fiorenzo on December 24, 2021, 10:47:50 pm ---I could think about maybe a shunt, they gives very low output when measuring currents, i use many times shunts in my circuits....

Speaking instead about a signal amplifier, as suggested by some one in this thread, It was told that they are a better way to check low intensity signals than giving faith on a low noise front end.

--- End quote ---
For such purposes you better use a pre-amplifier with a differential input. You can easely DIY these using an instrumentation amplifier chip or a specific current sensing amplifier chip. From there feed the amplified signal into your oscilloscope.
Fiorenzo:

--- Quote from: tautech on December 24, 2021, 10:41:51 pm ---
--- Quote from: Fungus on December 24, 2021, 09:47:49 pm ---
--- Quote from: tautech on December 24, 2021, 09:42:27 pm ---Don't, it's an abomination

--- End quote ---

Tautech says something made by Siglent is an abomination? Avoid like the plague.  :scared:

(I haven't actually used one, I sorta assumed it would work for 300 Euros given that the rest of the 'scope is OK)

--- End quote ---
It works fine but it becomes another box on the bench instead of being inbuilt which would be difficult with the very compact SDS****X-E series.

--- Quote from: Fungus on December 24, 2021, 09:47:49 pm ---
--- Quote from: tautech on December 24, 2021, 09:42:27 pm ---get the SDS2104X+ and SPL2016 instead. Totally different and better class of MSO probe.

--- End quote ---

And ... totally blows the budget. That's the tautech we know and love.  :)

Edir: I'm only kidding, OP did mention "2000 Euros" somewhere and it's not quite 2000...

--- End quote ---
SPL2016 with a new scope are on special ATM until at least years end for the unbeatable price of $219 with MSO and FG licensing. That's one hell of a deal unless you want to DIY one with the info from that thread.

Christmas midday dinner calls.......

--- End quote ---

Yes i really need a complete mso now because i am designing an e-bike controller from scratch and also working with the display circuitry and program that i am also designing from the bottom. I did similar things in the past, but without an oscilloscope and had to cope with the problems encountered only with the help of the theory and literature due to the fact that i couldn't check my circuits... But i got to the end fine everytime. Such a satisfaction...
Sorry for my bad english...

The offer from siglent is very appealing and i don not have the time now to make the probes by my self.
But i could instead buy a cheaper scope and an external LA to connect on the computer, maybe this  is the best way to proceed at the moment
Ummm... But i am not sure what way i will take hahaha....

Actually i saw that the AWG of the siglent and rigol are limited and an external signal generator could be better.... But i like that the Rigol has two outputs.
I should try a siglent but Amazon don't sell It here in Italy, only the lower models....
Fiorenzo:

--- Quote from: nctnico on December 24, 2021, 11:12:54 pm ---
--- Quote from: Fiorenzo on December 24, 2021, 10:47:50 pm ---I could think about maybe a shunt, they gives very low output when measuring currents, i use many times shunts in my circuits....

Speaking instead about a signal amplifier, as suggested by some one in this thread, It was told that they are a better way to check low intensity signals than giving faith on a low noise front end.

--- End quote ---
For such purposes you better use a pre-amplifier with a differential input. You can easely DIY these using an instrumentation amplifier chip or a specific current sensing amplifier chip. From there feed the amplified signal into your oscilloscope.

--- End quote ---

Thank you i will do It
bdunham7:

--- Quote from: Fiorenzo on December 24, 2021, 10:47:50 pm ---What circuits works with such a low intensity signals?
Sensors for example?
I could think about maybe a shunt, they gives very low output when measuring currents, i use many times shunts in my circuits....

Speaking instead about a signal amplifier, as suggested by some one in this thread, It was told that they are a better way to check low intensity signals than giving faith on a low noise front end.

--- End quote ---

Yes--sensors, audio circuit, measuring circuits, even RF circuits.  And keep in mind as I said before that you may often want to use a 10X or even 100X probe or custom voltage divider to avoid loading the circuit you are testing and that will magnify the problem. 

Here's the scope with a 10X probe connected to a 50-ohm terminated signal generator with no signal running, no signal single-shot and then the same 1mV signal as before.  Note that I had to use the single-shot to capture the signal as it is so low that the scope won't trigger on it, however it is still clearly visible above the noise. 

As far as preamplifiers, yes they have a place but they are usually fairly specific and limited, as opposed to being general purpose.  For example they typically have a much more limited input voltage range or bandwidth, or both.

Fungus:
Fiorenzo,

Can you post a screenshot of your PSU ripple with 20MHz limiter and maximum averaging?

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