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Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China

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core:
A short test for the low pass digital filter.

An Axiomet AX-3004H power supply. 5V, switching frequency about 106kHz
Rigol DL3000 load, CC cycle mode, 50Hz, 150mA <-> 1,5A

Math 2 : Low-pass filter, scale 25mV/div.
10ms -> minimum lowpass frequency 25kHz
5ms -> minimum lowpass frequency 50kHz
2ms -> minimum lowpass frequency 250kHz

Triggering on ch1 no problem, HFR coupling.
Measurements on Math 2 are clear and reliable.
FFT is OK, but could be better than that.

The measurement environment is not optimised and the cables pick up some of the noise.
The idea was to check if the the LowPass filter is useful for a such application.

Later edit : the minimum lowpass filter frequency above is for an acquisition memory of 1MB.

Fungus:
What if you do FFT of Math2?


core:
FFT source must be a channel : CH1 - CH4.
Can't do math on math.

ebastler:

--- Quote from: core on December 18, 2023, 07:30:11 pm ---FFT source must be a channel : CH1 - CH4.
Can't do math on math.

--- End quote ---

Some Math functions do work on Math results, but not FFT.

Fungus:

--- Quote from: core on December 18, 2023, 07:30:11 pm ---FFT source must be a channel : CH1 - CH4.
Can't do math on math.

--- End quote ---

I just checked because I did it earlier today...

You can use math as source for most functions but not FFT.

Maybe it's because FFT is done in the FPGA or something.  :-//


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