Products > Test Equipment
Rigol HDO1000 and HDO4000 12bit oscilloscopes launched in China
TurboTom:
Hey egonotto -
I just scanned through your latest messages and I didn't find any information on the firmware version that you're running on your DHO1000. If it's a very early one, maybe try updating it to the most recent version and see if the flakey AC RMS measurement gets sorted. I don't remember to have seen anything like this on my DHO1000 which has the latest version (00.02.12) installed. Just an idea, though... ;)
egonotto:
Hello,
when I got the DHO1074 it had firmware 00.02.04. But I had quickly set up 00.02.12
Best regards
egonotto
Martin72:
I was also able to observe these phenomena with the DHO4204, and that was 10 months ago.
It remains to be feared that the "good old tradition" of rigol will also strike with the 12-bit models and that they will only do what is necessary to keep the box crash-free.
There is also the question of why the user has no leeway and things like interpolation and display mode are fixed.
Maybe it's better not to know that.
core:
In the past, I've done some testing with the MSO5000, which still has the dots mode. In certain configurations, dot mode looks very clear and nice. But if you go to zoom in further, it starts to interpolate and put intermediate points using sinx/x interpolation. Siglent is more predictive, like "in the book".
I've come to terms with the fact that it's noisy and I don't use it below 20mV/div. I put it down to the fact that the input amplifier runs at high temperature and could be an explanation. It was the first oscilloscope I came across that had heat sinks on the input stages. Not very usual for me.
To get to 8GSa/s at a decent price I suspected that there were actually several DACs running in interleaved mode in the DAC chip. It could be for example 8x1GSa/s or even 16x500MSa/s combined in pairs of 2 and 4 respectively to cover the 4 channels. That would explain why it behaves so strangely in dots mode and why it doesn't have X interpolation mode. It's hard to align all these DAC's, so the software has to do something about it.
In this way I thought Rigol managed to get such a good price for the MSO5000.
The DHO also has the input stage operating at high temperature, but at the same time has low noise. I seem to be missing something here. Also the DAC they manufacture may be hiding some unknowns.
My main field of work is in power electronics, so I don't have expertise in high frequencies small signals. It's quite possible I'm wrong in the above :-//
2N3055:
--- Quote from: core on December 16, 2023, 11:28:01 am ---In the past, I've done some testing with the MSO5000, which still has the dots mode. In certain configurations, dot mode looks very clear and nice. But if you go to zoom in further, it starts to interpolate and put intermediate points using sinx/x interpolation. Siglent is more predictive, like "in the book".
I've come to terms with the fact that it's noisy and I don't use it below 20mV/div. I put it down to the fact that the input amplifier runs at high temperature and could be an explanation. It was the first oscilloscope I came across that had heat sinks on the input stages. Not very usual for me.
To get to 8GSa/s at a decent price I suspected that there were actually several DACs running in interleaved mode in the DAC chip. It could be for example 8x1GSa/s or even 16x500MSa/s combined in pairs of 2 and 4 respectively to cover the 4 channels. That would explain why it behaves so strangely in dots mode and why it doesn't have X interpolation mode. It's hard to align all these DAC's, so the software has to do something about it.
In this way I thought Rigol managed to get such a good price for the MSO5000.
The DHO also has the input stage operating at high temperature, but at the same time has low noise. I seem to be missing something here. Also the DAC they manufacture may be hiding some unknowns.
My main field of work is in power electronics, so I don't have expertise in high frequencies small signals. It's quite possible I'm wrong in the above :-//
--- End quote ---
You are not wrong, in theory.
MSO5000 had higher noise because it used both ADC and front end chip that are 4 GHz capable.
Many manufacturers use massively interleaved ADC (including Keysight), and there are many tricks of the trade there to achieve best performance.
From clock distribution, to buffering, to calibration...
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