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| Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China |
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| Martin72:
--- Quote ---You can use math as source for most functions but not FFT. --- End quote --- Also does not work with the siglent scopes. Edit:Misunderstood |
| core:
--- Quote from: core on December 18, 2023, 07:18:46 pm ---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. --- End quote --- Another capture, using 3 Math functions. 2 x LPF filter for normal and zoom waveforms, and FFT. |
| core:
Same signal for MSO5000. Same filter. Measurements are OK. Can't do the LPF filter when zoom is activated (filters are disabled in meniu). And just to be all together, SDS1104X-E (filters not available) and Uni-T UPO1202CS (it seems that filter is using the display data only). |
| Performa01:
--- Quote from: Martin72 on December 18, 2023, 09:25:34 pm --- --- Quote ---You can use math as source for most functions but not FFT. --- End quote --- Also does not work with the siglent scopes. --- End quote --- You should rethink that statement. FFT results cannot be the source for math operations, but Math (incl. FFT) can take channel traces, zoom traces, memory traces and math traces as operands. |
| ebastler:
--- Quote from: core on December 19, 2023, 09:06:42 am ---Another capture, using 3 Math functions. 2 x LPF filter for normal and zoom waveforms, and FFT. --- End quote --- The dedicated counter is limited to working on the physical inputs -- but measurements (both cursor-based and automatic) can be applied to Math results without restrictions, right? Just out of curiosity: Can you apply automated measurements, as well as further Math operations, to the FFT spectrum? Not sure whether there is anything useful to be measured or calculated, but still... |
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