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Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China

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egonotto:
Hello,

I am very dissatisfied with the record function of DHO1074. Firstly because I can't save the data, but also because there are often gaps. I wanted to record 100 events that last 20 us and occur every 5 ms. Again and again the distance between two consecutive events is 10 ms and a event is missing in between.

Best regards
egonotto

ebastler:
Indeed, the Record function is disappointing, unless I am overlooking something. Even with the smallest number of data points per sweep (1 kpts) and a fast timebase (say 2 µs/div, so 20 µs for the full sweep), the average time step between stored records is 5.8 ms according to the scope's timestamps.

And even those timestamps are probably wrong: Acquiring a series of 1000 frames takes 15 seconds on a stopwatch, while the progress bar and frame counter move forward in a linear manner. But the scope claims that the last record has a timestamp of 5.8 seconds?!

egonotto:
Hello,

it's a particular shame because Rigol could do much better with little effort. You just don't need to update the screen during the recording. And enabling saving is not that complicated either. I believe that you can at least save the screen data with SCPI commands.

Best regards
egonotto

Martin72:
What are your setups like? I would try this on the DHO804.

ebastler:
For my quick test it was just channel 1 enabled, 2 µs/div, 1 kpts memory. My test signal had repeating bursts of pulses (approx. 300 kHz, lasting 500 µs, followed by 500 µs silence), so about 1 ms total period.

I first triggered this "properly", looking for a low pulse lasting much longer than the 300 kHz period to always start at the beginning of a burst. Then figured that the trigger might slow down the recording and tried it again using simple edge triggering, but this did not affect the frame capture rate.

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