Hello,
I played yesterday a little with my new toy.
First, i compared the response of the the scope with a fast pulse generator
1) Response of the Rigol MSO2072A (modified for MSO2302A)
2) Same measurement with Siglent SDS2104X-Plus (modified to SDS2354X-Plus)
As we show, results are both very good, but the rise time with Siglent is a little better.
Fine.
Then I tested the Bode plot function, because i have some doubt if that can really work well
with the dynamic range of a scope. I tested lot of stuff, but i show here the response
of a passive 6th order 100kHz low pass filter.
3) Results of low pass filter Bode Plot.
The screenshot show very good response, I'm surprised how the low signal level is very well
measured by the scope to have clear shape down to about -110dB !
In a second time, i have tested the measurement floor and cross-talk by removing the DUT
and placing nothing on channel corresponding to DUT output
(only one channel connected to DUT input from internal generator).
I tested this with reference channel to C2 (near C1) and C4 (far C1) to check if there is
cross-talk issue if we use side channels. Excitation voltage is maximum of 2Vrms
from 5kHz to 50MHz (maximum allowable by the internal generator).
ode plot is set to auto level.
4) Bode response without DUT (C1-C2) 5kHz to 50MHz 2Vrms.
5) Bode response without DUT (C1-C4) 5kHz to 50MHz 2Vrms.
As we show, the measurement floor is near -120dB that is very good for the instrument.
There is also no clear cross-talk even at maximum frequency. Congratulation Siglent !
I tested also a 10kHz passive notch filter, and then I download the data results to export to csv format.
After importing this that give the result on the next graph.
6) 10kHz Notch filter response (CSV import).
Now, some comments about this scope from these first hours use ,
- he Bode Plot time is very long and there is no possibility (as i show)
to choose the averaging/sampling time. - The UI hang-up if you try to do something when it operate
(A message would be welcomed) - When using the function generator, when increasing the frequency with the knob,
the increment was much too high and change with speed.
So, impossible to have 1kHz, and move around this value with 1Hz or 10Hz resolution.
It's however a basic function for a generator.
It's possible to set a direct frequency, but unusable for varying around a value. - I don't understand also why in "simple" measurement mode it is not possible to mix
measurements between channels, that would be great to avoid taking space when it's not needed.
Anyway, i must say that the Siglent is very pleasant to use and GUI is overall well done.
The display is big and clear, and comparing to the MSO2072A, the fan noise is much lower.
(Of course the dream would be a fan-less scope, i hate the noise like many others here) .
So, i must to play more with to try all others functions.
Regards.
Frex