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SIGLENT SDS1102CML - First Impressions

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margrove:
Although much of this thread is Greek to me it seems that the SIGLENT SDS1102CML is a good bet for a first time DSO buyer. I'm very glad to see that SIGLENT has a presence on this forum which augers well for bug squashing.
Or can I do better for the price? :-\

sameerdhiman:
Hi Siglent Representative,

A suggestion from my side: Please provide Cross-Cursor under FFT measurement to get V & Fq values at the same time.

Regards,
Sameer Dhiman
(DSO-5070A Metravi India == Siglent SDS1072CML)

bjoernx:
Got my 1072CML today! :-+

So far did not get the hang of this FFT thing.
Just looked up the manual... and guess what: there on page 22 it explicitely states, that their FFT function is designed as a LOL-detector! So what... 


"Analyze the Humorous wave in the Power cable."
"Test the Humorous content and distortion in the system"
L*MAO!  :-DD

sameerdhiman:
 :-DD

Actually, they are right to some extent because the noise floor is too high and you won't see harmonic contents in the noise grass other than high Hum signals.

rf-loop:

--- Quote from: sameerdhiman on September 06, 2013, 09:59:50 am ---
Actually, they are right to some extent because the noise floor is too high and you won't see harmonic contents in the noise grass other than high Hum signals.

--- End quote ---

And you have data for this?


Opinions are opinions and joking is joking but I respect data.
Also this same test can repeat where ever lab.

Siglent use 1024 point FFT calculation as also so many others in same class.
But where is this high noise floor? There is just natural noise floor. It have 8 bit ADC also.
There is not any kind of averaging in use, no high res mode etc.

Signal, in this case HP8657B and coaxial to scope input where is T connected 50ohm terminator (becouse it is enough accurate for this kind of use)

Siglent model used here: SDS1102CML
Input 50mV/div
FFT zoom 10x, Filter Blackman, vertical 10dB div
Infinite persistence on.

Signal 21MHz

in image there is 10dB steps from -54dBm to -4dBm  (and end of test signal is left to -24dBm level)If I run only -54dBm signal,  noise floor is more down and then example -64dBm is well detectable over noise floor. This visible noise floor is mainly from -4dBm input signal what rise some amount noise floor and infinite persistence keep it visible.

Incoming signal level steps are:
 
447uVrms (-54dBm)
1.41mVrms (-44dBm)
4.47mVrms (-34dBm)
14.1mVrms (-24dBm)
44.7mVrms (-14dBm)
141mVrms (-4dBm)


Where is now "high noise floor" if stay in this kind of oscilloscopes class.

Note that visible noise floor is  max peak noise floor, not average noise floor.
Visually with eyes it can easy look that minimum detectable signal is around 55 - 60dB under maximum signal level.
Why I use this splitted display. Becouse infinite persistence looks some amount terrible if there is full screen where input signal in time domain and FFT overlay.

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