Author Topic: New 2ch pocket DSO+SG - SigPeak DSO2512G  (Read 1822 times)

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Offline tunk

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New 2ch pocket DSO+SG - SigPeak DSO2512G
« on: April 11, 2021, 06:09:49 pm »


Edit, 08-05-2021: Looks like the original video is gone private.
There's a copy here:
« Last Edit: May 08, 2021, 02:34:11 pm by tunk »
 

Offline tunk

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Re: New 2ch pocket DSO+SG - SigPeak DSO2512G
« Reply #1 on: April 13, 2021, 04:18:27 pm »
And here's a screen dump of the PCB (taken from the youtube video):
 

Offline Ivanko1

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Re: New 2ch pocket DSO+SG - SigPeak DSO2512G
« Reply #2 on: May 01, 2021, 08:15:23 am »
How much for it? And where to buy? Is it on Aliexpress?
 

Offline I wanted a rude username

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Re: New 2ch pocket DSO+SG - SigPeak DSO2512G
« Reply #3 on: May 01, 2021, 09:22:21 am »
It's on Taobao for 500 RMB.

Supereyes also lists it, but at double the price (and almost sold out) ... they are the "Russian supplier" that Mikhail Shevchenko corrected on the screen size ... their listing page has his discussion with them, as well as the Russian manual.

Haven't seen a test of how it performs at higher frequencies yet, but at 500 MS/s I don't see how the bandwidth can be 120 MHz ...
 

Offline shakalnokturn

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Re: New 2ch pocket DSO+SG - SigPeak DSO2512G
« Reply #4 on: May 01, 2021, 11:37:31 pm »
Haven't seen a test of how it performs at higher frequencies yet, but at 500 MS/s I don't see how the bandwidth can be 120 MHz ...

Why's that?
 

Offline ledtester

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Re: New 2ch pocket DSO+SG - SigPeak DSO2512G
« Reply #5 on: May 02, 2021, 02:49:21 am »
Haven't seen a test of how it performs at higher frequencies yet, but at 500 MS/s I don't see how the bandwidth can be 120 MHz ...

Why's that?

These cheap oscilloscopes seem to be reporting their bandwidth based on "equivalent time sampling". Since 1996 mainstream oscilloscope manufacturers speak of bandwidth in terms of "real-time sampling". Dave talks about this in this blog video (around 22:40):

EEVblog #1317‚Äč - $140 2CH 100MHz Fnirsi Tablet Oscilloscope Review
https://youtu.be/5iwtDwJlbWk?t=22m40s

Moreover, you should be aware that the claimed bandwidth may only apply to repetitive signals. It's a good idea to see a teardown of the device and the results of performance tests before believing any claims made by the manufacturer.
 
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Offline shakalnokturn

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Re: New 2ch pocket DSO+SG - SigPeak DSO2512G
« Reply #6 on: May 03, 2021, 07:36:09 am »
Thanks for explaining.
I get the idea but find it a little confusing using "bandwidth" for the maximum single-shot frequency that can be displayed where front-end bandwidth, real time sample rate and equivalent time sampling could be considered separately. (When known of course...)
Even if in most use cases the real time sample rate will be the limiting factor, equivalent time can have it's use if the front-end bandwidth is sufficient for the job.
 

Offline tunk

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Re: New 2ch pocket DSO+SG - SigPeak DSO2512G
« Reply #7 on: May 08, 2021, 02:20:36 pm »
Starting to show up at aliexpress from around 95us$.
 

Offline edsjac

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Re: New 2ch pocket DSO+SG - SigPeak DSO2512G
« Reply #8 on: May 16, 2021, 01:30:42 pm »
They claim that the sample rate is 500 MSa/s, but...

All the cheap Chinese oscilloscope uses an ADC based on AD9288. In the best case, if the design was well-made, it uses the two ADC channels to get 200 MSa/s (when one oscilloscope input is enabled). If you use both two oscilloscope inputs, the real sample rate is 100 MSa/s (considering that the ADC is not overclocked).
By the photo of the PCB, it looks like that they have erased the ADC identification. Moreover, none of the components has identification on the PCB.
In the video review, the auto function seems to don't work properly, it takes almost 10s (at time 8m08s).
 

Online pcprogrammer

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Re: New 2ch pocket DSO+SG - SigPeak DSO2512G
« Reply #9 on: May 16, 2021, 03:22:59 pm »
I see in the picture of the pcb that they used the same F1C100s that is used in the FNIRSI-1013D. For the FPGA on the other hand they used a lattice chip.
Probably similar to the cyclone iv and most likely not capable of doing 500Ms/s on a parallel bus. The layout near, what is most likely the adc chip, is pointing in the direction of the AD9288 mentioned in the previous post. Two 8 bit lanes to support the two ADC's in the chip.

The analog front end looks a bit more complex then the one in the FNIRSI. Would be interesting to see the actual differences in a schematic drawing.

Sample rate of this one will be at most the 100Ms/s with both channels enabled, where the FNIRSI has 200Ms/s since it uses two of these ADC chips.
 

Offline visenri

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Re: New 2ch pocket DSO+SG - SigPeak DSO2512G
« Reply #10 on: June 13, 2021, 07:01:43 pm »
This DSO seems to be manufactured by the same company of the DSO1511E.

Both the software and hardware are very similar. It seems to be the 2 version channel of that device.

I own a DSO1511E, and I would have bought a two channel version if they had it back then.

I am quite satisfied with the 1 channel version:
https://www.eevblog.com/forum/testgear/dso1511e-review/

This new one has 2 channels, X-Y mode, multiple waveform signal generator and better button layout / usability than the 1 channel version.
The only downside seems to be that it doesn't have the reference waveform function and it is bigger than it's predecessor.

It's so tempting, that maybe I will buy it too  ;).


 


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