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| Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China |
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| voltsandjolts:
Well, I didn't really need another scope, but at £620 DH1074 looked like a bit of fun, so I took the plunge on my first ever bit of Rigol test kit, with low to medium expectations of customer satisfaction :-) First impressions: Fan is a little bit noisy, in a low-pitch 'whooshing' sort of way. Not too bad. Display is excellent, for UI elements and traces, very crisp and clear. Nice fonts. The UI layout and operation with touch and buttons is very good. Quite intuitive. Touch and feel of buttons and knobs is good. Plastics quality is good. The DC accuracy of all 4 channels is within the 2% specification. However, at low frequencies CH1 reads about 4% lower than other channels. For example, with all probes x1 connected to scope comp output, hit Default then AUTO. All 4 traces overlay perfectly. Switch to x10, hit AUTO. CH1 very obviously different, showing 4% lower amplitude than other channel traces (with probes on x10 the input channel relays have switched to the lower input range). Do your traces overlay perfectly in that setup? |
| core:
--- Quote from: ebastler on December 19, 2023, 10:13:33 am --- --- 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... --- End quote --- I've checked. Please see below. Ch1 : rectangular waveform, 1MHz, 600mVpp Math 1 : High Pass filter 10MHz Math 2 : Math 1 + Ch1 Math 3 : FFT(Ch1) Math 4 : Math1 - Math2 Masurements are made for Math 4 : Vpp, AC rms, Freq In the pictures you can check that the counter source must be a hw input : Ch1 - Ch4 and Ext Later edit : measurements are available even for Math 3, but they are meaningless for FFT - most of them. |
| Performa01:
--- Quote from: Martin72 on December 19, 2023, 11:47:18 am --- --- Quote from: Performa01 on December 19, 2023, 10:04:26 am --- --- 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. --- End quote --- But that was exactly the point, whether FFT can be used as a source and after I tested it again to be sure, I said no. And I didn't mean anything other than that. :) --- End quote --- Sorry, but I have difficulties understanding you. When someone says "You can use math as source for most functions but not FFT" then that means you can not use math as source for FFT, not vice versa, right? |
| ebastler:
--- Quote from: voltsandjolts on December 19, 2023, 12:07:18 pm ---For example, with all probes x1 connected to scope comp output, hit Default then AUTO. All 4 traces overlay perfectly. Switch to x10, hit AUTO. CH1 very obviously different, showing 4% lower amplitude than other channel traces (with probes on x10 the input channel relays have switched to the lower input range). --- End quote --- Have you tried swapping probes, to check whether the difference lies in the probes or in the scope frontend? If it is indeed the latter, have you run a self-calibration (after warming up the scope)? |
| voltsandjolts:
Yes, warm-up and self cal done (several times). Also swapped probes amoung channels, no change, so CH1 frontend is causing this. |
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