Another DSO+DMM - Zeeweii DSO3D12, claimed 120MHz/250MSps (june 2023)

[RAPo]

Estimated delivery date = 30th august. A little bit of patience is needed.

I know the device is very fresh. But sometimes the Aliexpress ships really quickly so I was hoping someone (RAPo?) already have one or may get one in coming days. The "marketing pictures" somewhat answer some of my questions (if they can be trusted):

[Fungus]

I just found the manual for this online:

http://www.sigpeak.com/download/zeeweii-DSO3D12_manual_EN.pdf

[wasedadoc]

I just found the manual for this online:

http://www.sigpeak.com/download/zeeweii-DSO3D12_manual_EN.pdf

That same link was in the very first post 8 weeks ago.

[RAPo]

The Zeeweii DSO3D12 is in.
Did a little basic testing: all seems to be working.
First complaint: I don't like the output pins for the Gen. Will modify it to banana jacks.

Have a basic question: how do I get the saved images to the PC? Asked Zeeiweii for assistance.
Very nice feature: you can save images with a black background or inverted + you can select the color for the 2nd channel.
Especially for you guys I did open the scope. See the images below.
Hires will follow later.

Yes, you can use scope+ gen+dmm (in a little window) together.
You cannot use the DMM while USB is connected.
Indeed the FFT is the same as on the DSO2512G, only reference no measuring.

[RAPo]

Got a message from Zeeweii:

DSO3D12 does not support transferring images to PC.

I asked to add this in a firmware update.

[RAPo]

Results from DMMCheckplus for the DMM:

[Aldo22]

Thanks for testing and opening.

Does it actually have a rubber-like housing like the DSO2512G or is it hard?
I find that quite practical with the DSO2512G. It does not slip and does not fall down e.g. somewhere in the engine compartment.

Got a message from Zeeweii:

DSO3D12 does not support transferring images to PC.

Yes, it also has no AV output afaics.

I still think DSO2512G + AN870 is the better equipment in this price range for my case.

[RAPo]

It's a hard plastic.
Indeed no AV output, but that doesn't bother me.
If I hook it up to an USB port a USB serial  CH340 com port comes in the system, no way to get to the files.
I think you are right regarding the combo.

Does it actually have a rubber-like housing like the DSO2512G or is it hard?
I find that quite practical with the DSO2512G. It does not slip and does not fall down e.g. somewhere in the engine compartment.

Yes, it also has no AV output afaics.

I still think DSO2512G + AN870 is the better equipment in this price range for my case.

[Aldo22]

After what I had written here:
What is the bandwidth of the signal generator (sine/other)?

Do you see the jitter?
Zeeweii writes "When the set frequency is greater than 1MHz, the square wave signal may show small horizontal jitter".

Is the voice assistant usable in practice?

Is the screen looking good?

Thanks!

[RAPo]

sine wave max 5MHz, square wave and others max 2MHz.
Horizontal jitter starts at 1.02MHz (sine), 1.01 MHz square but is not really noticeable.
For a 50% square wave:
   1kHz Vpp=2.53V Duty = 50%
   1MHz Vpp=2.49V Duty = 49.5%
   2MHz Vpp=2.47V Duty = 48.6%-49.6%

Didn't try out the voice assistant yet.
Screen quality is the same as the DSO2512G

[Aldo22]

Thank you!

Screen quality is the same as the DSO2512G

But it should be bigger and better (According to the advertisement)?

[ptluis]

Got a message from Zeeweii:

DSO3D12 does not support transferring images to PC.

I asked to add this in a firmware update.

I don't understand how they manage to launch a new product and remove important features.  Voice activation is interesting but then they fail at unthinkable things.  And to transfer images to the computer, well, we have to use a smartphone

[RAPo]

Indeed quite incomprehensible.
phone + OTG would be nice, but isn't there.  .

I don't understand how they manage to launch a new product and remove important features.  Voice activation is interesting but then they fail at unthinkable things.  And to transfer images to the computer, well, we have to use a smartphone

[RAPo]

But it should be bigger and better (According to the advertisement)?

Yes, it is bigger, no doubt about that, but I find the quality more or less the same.

[ptluis]

Indeed quite incomprehensible.
phone + OTG would be nice, but isn't there.  .

phone camera 

[RAPo]

I'll know, I'll know 

Indeed quite incomprehensible.
phone + OTG would be nice, but isn't there.  .

phone camera 

[siealex]

I don't understand how they manage to launch a new product and remove important features.

To make them subscription based.

[RAPo]

Strange triggering.
I'm applying a 1kHz square wave with a 1% duty cycle (from the Fnirsi DPOX) and zooming out to 10ms.
A block of square waves randomly flops from right to left on the screen.

[ptluis]

Strange triggering.
I'm applying a 1kHz square wave with a 1% duty cycle (from the Fnirsi DPOX) and zooming out to 10ms.
A block of square waves randomly flops from right to left on the screen.

why is the scope in AC coupling?

[wasedadoc]

Strange triggering.
I'm applying a 1kHz square wave with a 1% duty cycle (from the Fnirsi DPOX) and zooming out to 10ms.
A block of square waves randomly flops from right to left on the screen.

why is the scope in AC coupling?

Why would that have any influence on the issue that RAPo is querying?

[Fungus]

Strange triggering.
I'm applying a 1kHz square wave with a 1% duty cycle (from the Fnirsi DPOX) and zooming out to 10ms.
A block of square waves randomly flops from right to left on the screen.

1% duty is very narrow. The display is probably missing the peaks if they don't line up properly with the decimation filter.

(or they're going in and out of phase with it, which is probably what you're seeing)

What happens if you zoom in? I think they should appear.

[ptluis]

Strange triggering.
I'm applying a 1kHz square wave with a 1% duty cycle (from the Fnirsi DPOX) and zooming out to 10ms.
A block of square waves randomly flops from right to left on the screen.

why is the scope in AC coupling?

Why would that have any influence on the issue that RAPo is querying?

I didn't say it had influence, I asked why it was in AC coupling.

[RAPo]

why is the scope in AC coupling?

no particular reason, I started with DC then retest with AC coupling and no difference then I made the photo.

[RAPo]

1% duty is very narrow. The display is probably missing the peaks if they don't line up properly with the decimation filter.
(or they're going in and out of phase with it, which is probably what you're seeing)
What happens if you zoom in? I think they should appear.

If I zoom in, the signal is triggered.
Will investigate this some more.

[Aldo22]

I'm applying a 1kHz square wave with a 1% duty cycle (from the Fnirsi DPOX) and zooming out to 10ms.
A block of square waves randomly flops from right to left on the screen.

Maybe that's not such a bad thing.
The Zeeweii tells you this way that the resolution is not enough to display the signal reasonably.
Whatever it shows (all yellow, all transparent, what do you expect it to show?) it's wrong anyway ;-)

Just the screen alone: How many 1% peaks can you adequately display with 360 pixels?

My 2 ¢