OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG

[gtube]

Although it doesn't have FFT feature in the scope. 
I found out that its PC software has FFT feature.

[hobbeeist]

@gtube - on your picture of the 100MHz sine, the horizontal orientation is messing with me. Can you confirm that it says "2.0ns" as the horizontal div duration, but that the period shown on screen is actually only 4 divs across? If so, then that seems like a new bug, and either the waveform should actually take up 5 divs (5*2ns = 10ns), or should display a horizontal div of 2.5ns (4*2.5ns = 10ns)

[gtube]

@gtube - on your picture of the 100MHz sine, the horizontal orientation is messing with me. Can you confirm that it says "2.0ns" as the horizontal div duration, but that the period shown on screen is actually only 4 divs across? If so, then that seems like a new bug, and either the waveform should actually take up 5 divs (5*2ns = 10ns), or should display a horizontal div of 2.5ns (4*2.5ns = 10ns)

HP shows 2x5ns = 10ns. The HDS2102S shows 4x2ns = 8ns. It is definitely a bug!

[tly]

I scanned the earlier parts of this thread, and tested most (if not all?) of the reported shortcomings.
...
d) Present. Changing from sample to peak affected the frequency measurement (but not the counter). I looked around the waveform after stopping, and didn't see any double edges, but maybe I just didn't look closely enough.
...
h) Present. Battery indicator jumps from ~6pixels to "low battery" at around 3.76V (measured both cells). This could be intentional, depending on power supply margins needed.
i) Present. However, as explained in an earlier post, an AC trigger coupling with a DC signal coupling doesn't lend itself easily to a reasonable way to display
...

Thanks alot for info.

3.FIXED Osciloscope measured frequency is flawed / wrong when Acqu Mode is set to "Peak detect"

Based on @rn777 it seems they fixed "bug d)" too in later firmware versions.

Regarding "bug h)" - I tend to agree with you: was a design decision.
And regarding "bug i)": is about setting Chanel to AC coupling and Trigger to AC coupling.

I noted that is more info presented on display in upper side. 


/offtopic:
In case you need (cheap) probes for this device check for "P6100 EU version" or "Hantek PP-150". Both have insulated BNC.
Around 16 USD / 2 pcs.

[rn777]

470mF 25v Jamicon measured as 468.4mF. The second 463.4mF 3300mF 16v is measured as 3320mF.
Which is quite accurate. OWON HDS272S model h / w 3, s / w 5.6.2.
About 3000mF, there is a trick. The device measures a maximum of 2000mF, then shows "OL" - over load (inability to measure). But if you press the trig / delta icon at this point, the measured capacitance above 3000mF will be displayed. As practice shows, quite accurate measurements. More accurate than my Victor 70C multimeter.

[rn777]

Because there was some doubt as to whether or not it could play "oscillofun", and I said I'd try it out if nobody else did I went ahead and played the "oscillofun" song from my laptop into an audio patch cord, and clipped the probes to the other end of the cord. Sure enough, it shows up on screen! I didn't record a video, since it looks nearly identical to the original video that was posted, but I did take a photo as evidence. I also gave a couple other tracks a try, like YouScope, but results were generally so-so, as one might expect with a cheap DSO.

Yes, it's realy video. I record video https://youtu.be/4Rd8Pb8mgm0
I apologize for the doubt. I not have two oscilloscop probe and i used two probe without compensacion capasitor.

[rn777]

Can any bady wieving it in Owon HDS200?

[eti]

Because there was some doubt as to whether or not it could play "oscillofun", and I said I'd try it out if nobody else did I went ahead and played the "oscillofun" song from my laptop into an audio patch cord, and clipped the probes to the other end of the cord. Sure enough, it shows up on screen! I didn't record a video, since it looks nearly identical to the original video that was posted, but I did take a photo as evidence. I also gave a couple other tracks a try, like YouScope, but results were generally so-so, as one might expect with a cheap DSO.

Yes, it's realy video. I record video https://youtu.be/4Rd8Pb8mgm0
I apologize for the doubt. I not have two oscilloscop probe and i used two probe without compensacion capasitor.

большое спасибо! 

[gtube]

Can any bady wieving it in Owon HDS200?

https://youtu.be/8n9TMQlJwsk

It doesn't restore the video clearly. I think I will get a Owon 14bit scope in order to play it well.

[hobbeeist]

https://youtu.be/8n9TMQlJwsk

It doesn't restore the video clearly. I think I will get a Owon 14bit scope in order to play it well.

Two notes from this:
1) Did you play the YouTube video, or did you download the WAV file and play it? YouTube uses lossy compression on the audio, so you'll get more noise from that too. I don't expect you to see a large difference, but perhaps some.
2) Your screenshot only shows a capture rate of 500ksps, which is odd since mine was 1.25Msps. Turns out, if you press HOR > Length to get 8k, you'll get the faster sps rating. I can't think of a good reason why, though, since the length of the buffer should be independent of the sampling rate.

[gtube]

https://youtu.be/8n9TMQlJwsk

It doesn't restore the video clearly. I think I will get a Owon 14bit scope in order to play it well.

Two notes from this:
1) Did you play the YouTube video, or did you download the WAV file and play it? YouTube uses lossy compression on the audio, so you'll get more noise from that too. I don't expect you to see a large difference, but perhaps some.
2) Your screenshot only shows a capture rate of 500ksps, which is odd since mine was 1.25Msps. Turns out, if you press HOR > Length to get 8k, you'll get the faster sps rating. I can't think of a good reason why, though, since the length of the buffer should be independent of the sampling rate.

You're right. Wav file and 1.25Msps/2.5Msps looks better. Thanks! Very interested to see how 14bits looks like?

[hobbeeist]

You're right. Wav file and 1.25Msps/2.5Msps looks better. Thanks! Very interested to see how 14bits looks like?

There are a few factors working against this:

• DSOs have finite memory depth, limiting the total number of points that can be displayed
• DSOs have finite bit depth, limiting the sharpness of images
• DSOs generally don't accurately replicate the trace and decay characteristics of phosphor displays
• XY mode is somewhat niche in use cases, so isn't as well optimized or supported as XT mode
• Most consumer electronics with audio outputs are AC coupled, and thus are incapable of accurately rendering the DC waveforms in the audio files (e.g. Jerobeam Fenderson's "Dots")

These all apply not only to the HDS200 series, but to DSOs on whole. There are some models that will do better than others, but even if the HDS200 had 16bit ADCs, I wouldn't expect it to render oscilloscope music particularly well coming from a computer's audio jack, given the limited memory depth, and presumably no phosphor-simulating decay feature. Even my expensive DSO at work does a poor job in this use case. They simply aren't designed with musical images in mind.

The reason oscillofun works alright is because it sticks to simple geometries for the most part, that don't have major DC offsets. There are other songs out there, like ipaghost's "A Silly Scope", that I would expect to render alright on the HDS200, since the shapes are mostly simple. If you want to experiment with more complicated songs though, I'd recommend taking a look at the web-based phosphor oscilloscope simulator here: https://dood.al/oscilloscope/. You can load files locally, and play them back and watch the show.

[hobbeeist]

I tried Dancer, as well as Shrooms, and they actually came out better than I expected. I found that 1ms was a pretty good middle ground between having enough samples, and having enough persistence. Obviously if you sample more slowly, you get fewer points and thus less detail. However, if you sample too quickly, then the finite 8k sample space will fill up before you get samples to display the full image.

[hobbeeist]

I performed a bandwidth sweep from 50MHz to 250MHz (center: 150MHz, span: 200MHz). The signal generator was the "low" port of a TinySA, set to -6dBm. This port is rated up to 350MHz, so the early cutout is almost certainly due to the oscilloscope's response, and not the generator. I have not calibrated the TinySA, so it is possible that other variations in the signal levels are due to the generator, but it's just as possible that they're due to the HDS2102S. The two units were connected via a short SMA cable, and then an SMA to BNC adapter.

Bandwidth Sweep

Two main take-aways:
1) the frequency counter will display up to 119.9MHz, but calls it quits if you feed it 120MHz
2) the ~317mVpp (-6dBm) signal at 100MHz is reduced to ~100mVpp (-16dBm) at 190MHz, ~70mVpp (-19dBm) at 230MHz, and ~40mVpp (-24dBm) at 250MHz, so there seems to be a decent amount of attenuation as the signal approaches the 250MHz shannon-nyquist frequency, which is good since that means little chance of aliasing.

[rn777]

I received the HDS2102S earlier today.
S/N 2152*** (presumably built in week 52 of 2021)
SW: V1.3.3
Checksum: 67f52158.

. The board is dated 2021-09-16, and has a revision of HDS2102x_main_V1.0

PCB is very similar to HDS272s rev.3

[e1ioan]

PCB is very similar to HDS272s rev.3

Have you notice any differences? In the pictures they look identical.

[hobbeeist]

Have you notice any differences? In the pictures they look identical.

Definitely not identical. Below the battery (near the serial number), note that the buzzer has changed (again). Also, to the right of the buzzer (but left of the metal shielding over the ADCs), there appear to be a number of parts that have changed (or perhaps moved). For instance, there is no 8-pin chip on the HDS2102x board like there was on the HDS272x one.

[rn777]

PCB is very similar to HDS272s rev.3

Have you notice any differences? In the pictures they look identical.

In the photo pcb date manufactured older than that on HDS272s.
For this reason, there may be a difference in the chips. You need to watch the version of Owon hds 2102 released later than the hds272 revision

[rn777]

note that the buzzer has changed (again).

This detail does not matter.

[rn777]

Dates of manufactured
Owon hds272s
2021-09-27
Owon hds2102s
2021-09-16
Need more information about pcb components.

[tly]

If so, then that seems like a new bug, and either the waveform should actually take up 5 divs (5*2ns = 10ns), or should display a horizontal div of 2.5ns (4*2.5ns = 10ns)

HP shows 2x5ns = 10ns. The HDS2102S shows 4x2ns = 8ns. It is definitely a bug!

If you get an update let us know.
(Bgd and other chinese shops made alot of eforts to sell all the expensive stuff that was in EU depos in last months .)

 

[tunk]

Owon hds272s
2021-09-27
Owon hds2102s
2021-09-16

I guess those are design dates, and the first
four digits of the serial number is year and week.

[gtube]

If so, then that seems like a new bug, and either the waveform should actually take up 5 divs (5*2ns = 10ns), or should display a horizontal div of 2.5ns (4*2.5ns = 10ns)

HP shows 2x5ns = 10ns. The HDS2102S shows 4x2ns = 8ns. It is definitely a bug!

If you get an update let us know.
(Bgd and other chinese shops made alot of eforts to sell all the expensive stuff that was in EU depos in last months .)

I sent email to Owon to report this bug with the SN. Hopefully, there will be a response.

[hobbeeist]

New video from Kerry Wong, about the HDS2102S: https://youtu.be/CF3zBHMhQlM

Edit: adding like to the corresponding teardown blog: http://www.kerrywong.com/2022/02/11/teardown-pictures-of-the-owon-hds2102s-oscilloscope-dmm-awg-compared-to-the-hds272s/

[tly]

The bug about number of divisions that @hobbeeist and @gtube spoted is visible in Kerry Wong's video. 
At 50 Mhz are 8 divisions ( 16 ns -> 62.5 MHz ) in video at 10:23.
At 100 Mhz are 4 divisions ( 8 ns -> 125 MHz) in video at 10:55.