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Rigol DHO804 Test and Compare Thread

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Fungus:

--- Quote from: Martin72 on November 16, 2023, 04:21:17 pm ---So please forgive my scepticism that something bigger is happening.
I would be delighted if I were wrong, you can take my word for it. ;)

--- End quote ---

I don't pretend to understand Rigol internally. If you've just spent 100 million (or whatever) on developing a chipset and bringing these new devices to market then it seems a no-brainer to put a couple of people on EEVBLOG to gather info and do a monthly firmware update for the first few months.

The few bugs that we've found in the DHO800 seem to me like they could be fixed with a couple of morning's work.

It's a mystery.  :-//

Martin72:
Today I tested the waveform updaterate.
Based on the first table of rf-loop measurements, with a sine of 600mVpp and frequencies from 1khz up to 40Mhz.
As you know, with rigol you can't make any settings regarding vector/dots or lin / sinx/x, it only works as it is.
Memory mode is set to Auto, beforehand I made sure that the aux output is actually set to trigger out.
The trigger out signal has an amplitude of 3.3V and a single pulse width of 100ns.
The updaterates appear as bursts with pauses in between, which was to be expected.



Things worth noting:
from 5ns to 500ns the rate remains almost constant, between 1µs and 5µs it drops only slightly and between 5µs and 20µs it shows the halving at every timebase change that I know of.
But then from 50µs it drops drastically from 4 digits to 2 digits, for whatever reason.
The early minimisation of the sample rate is also interesting, it is already reduced from 100µs.
The memory points remain constant at 625 kpts from 50 µs - only at 500 µs does it rise again to 781.25 kpts and then drop again to 625 - whatever triggers this, especially as 781.25 is a rather crooked number.
I will have a look at the ultra acquiremode, how to use it and then create a table from it.
First attempt was "unsuccessful", I also had max 20000wfms/s in ultra mode.
Can't be right, so I'll look for what went wrong.

Martin72:

--- Quote ---The few bugs that we've found in the DHO800
--- End quote ---

Whereby the emphasis is on found.
And on bugs, there are also things that could be done better.
And how easy it is to fix things, I have no idea, but the scope is still very young, there's still something to come.

Martin72:

--- Quote from: Me ---I will have a look at the ultra acquiremode, how to use it and then create a table from it.
First attempt was "unsuccessful", I also had max 20000wfms/s in ultra mode.
Can't be right, so I'll look for what went wrong.
--- End quote ---

I'm beginning to understand what this mode is supposed to represent and how to adjust it, I also wrote down the values earlier, but I still have to transfer them to a table.
From 5ns to 20ns it is a constant 42000 wfms/s.
At 50ns something happens, the numbers shoot up to actually 1 million, fluctuates a bit.
Between 50ns and 500ns it remains in descending 6 digits and between 50µs and 100µs there is this dramatic drop again.
And the strange 781.25Kpoints are also present again at 500µs.
More of this soon.

Martin72:

--- Quote from: Fungus on November 16, 2023, 06:49:53 am ---See the video at 32:15:

--- End quote ---

I just did, it doesn't look nice, but I don't know the settings, nor are they revealed there.
And I switched off the video at the latest when the bodnar pulser is attached to the results and its comments. ;)

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