OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG

[Shonky]

you can't immagine how happy am I about the issues... before to buy I've watched many review/test in youtube nd nobody said a single word about issues and then... bang!... there are issues... WTF   

one question if I may:
- may I use the integrated signal generator to push a square wave into a cable, let's say an rca cable loaded at opposite side with a resistor between shield and core, and measure how the signal is after the travel in the cable with one of the channel of our scope? ... or I will damage something?
The user manual says: "To observe the output of the waveform generator, connect the other end of the BNC cable to the signal input connector of the oscilloscope" ... so, in theory, it should be possible to connect the output generator at one side of the cable, connect at the same side a crocodile clip cable and into CH2, connect at the other side of the cable (where is a resistor as load) the probe and into CH1... in this way may I see how the signal start, how is at the endo of travel, delay between? ... or I will damage something?
all the suggestions/tricks are more then welcome... I'm a real rookie

thks in advance

You can do what you want. The main thing is that you need to ensure ground stays the same at each end. The AWG ground is the same as the channel 1 and 2 grounds. If you connect a probe ground to the AWG signal, you will be shorting the output of the AWG. Hopefully the AWG output has some protection, but just don't do it in the first place.

This rule applies always to using most scopes. Grounds are common so you can't have probes referencing against two or more different locations as you'll just short the two points out.

[whc]

Just got the HDS2202S. Overall quite impressed with the function of the device, nice screen and UI is OK I think.

But the build quality seems a little "plasticky", especially the stand, just flopping around when picking it up, not great design.

Wondering about those plastic covered BNC connectors, how have those held up for you guys?

[elmood]

I also received the HDS2202S and the oscilloscope does not appear to work correctly. There is all kinds of noise in the signal, and the resolution looks extremely low. I fed in a tone at 1MHz and 10MHz from an RF signal generator and it's barely recognizable as a sine wave.  :'(

My unit has a 22xx datecode and running v1.2.0 firmware... I couldn't find any newer firmware listed anywhere... tried using HDS2102S v.1.5.1 as a last resort, but the update failed.

Does anyone have tips or should I just return it?

[orb]

I also received the HDS2202S and the oscilloscope does not appear to work correctly. There is all kinds of noise in the signal, and the resolution looks extremely low. I fed in a tone at 1MHz and 10MHz from an RF signal generator and it's barely recognizable as a sine wave.  :'(

Hi. Could you show some video or screenshot of this issue?

[whc]

Only getting around 2.5 hour battery life with two Panasonic 3400mhA batteries. The HDS2202S draws around 1.2A constant in operation. Should I not be able to get double the battery life?

[csuhi17]

I read a bit in the forum, but I didn't find what I was looking for.

With the HDS2202, if both channels are active, does the sampling of both channels remain at 1GSa/s? Doesn't it halve?

[hakko]

I read a bit in the forum, but I didn't find what I was looking for.

With the HDS2202, if both channels are active, does the sampling of both channels remain at 1GSa/s? Doesn't it halve?

 
https://youtu.be/1UaankSg1YI?si=_AOi6vmX-FaBpZlD

[hakko]

Only getting around 2.5 hour battery life with two Panasonic 3400mhA batteries. The HDS2202S draws around 1.2A constant in operation. Should I not be able to get double the battery life?

I also have the 2202s. With used crap batteries from an old notebook
tested each for about 1800mAH it goes for about 2 hours. So your batteries are fake?

[csuhi17]

thank you,
I've watched the entire video about 4 times, but I didn't notice something, I didn't pay attention to it.
 Then I understood why it was so much more expensive.

[hakko]

Only getting around 2.5 hour battery life with two Panasonic 3400mhA batteries. The HDS2202S draws around 1.2A constant in operation. Should I not be able to get double the battery life?

My test conditions: 50% screen brightness, sig gen on, oscilloscope running.

[hgryska]

Hello guys, I bought 2102s, and it seems it got some issue with noise. I got about 120-160mV on 1V/div,
1,2v-1,6V on 10V/div and so on. Does anybody had similar issue with it? I contacted seller(bg), but they claim that manufacturer said that "small noise is no problem"

https://youtu.be/N5MOkVwMtk8

And by the way the internals in my unit are propably the same as higher 2202s model, because it seems the same comparing with teardown photos, and it has Linsi brand ADC.

I just received my new HDS2102S (v4.1.0). Initially I ordered it because of the ADI ADC. But now I learned in this great forum that it has a LINSI ADC in meanwhile  :'(  Mine shows very similiar noise behavior like discussed on page 26 with nothing attached and DC mode. It is actually not completely noise, but a sine wave in the 50-60 kHz range. If the device is cold, I can even trigger on it and the noise is Vpp 160 mV at 1V/div. If the device warms up, it gets smaller (see attached screen shot). I am curious if HDS242 or 272 show similiar peak-to-peak noise. Can anyone check and post the figure for 1V/div?

Apart from this I am positively surprised regarding the multimeter performance and so far can't observe siginficant drift. More testing ongoing ...

[csuhi17]

HDS272S V3.3.3
Ch1 and Ch2 set to 1x, empty and cold.
80-120mV I don't know the frequency, it doesn't measure it.

[hgryska]

HDS272S V3.3.3
Ch1 and Ch2 set to 1x, empty and cold.
80-120mV I don't know the frequency, it doesn't measure it.

Thanks for testing. Very similiar results. Some more testing today resulted in following findings for the scope accuracy:

- Noise: 1,0 - 1,5% related to full scale for all ranges except 10 mV/div (2,0 - 2,5%)
- 9V DC measurement error: 1,4 - 2,1% for 2 and 5 V/div; 1,9 - 3,7% for 10V/div

Looks like the device matches pretty much the OWON specification with 3% DC gain accuracy

Overall still happy with the performance for the price 

[u666sa]

3 images. Cold, warmed up 15 minutes, and warmed up 15 minutes and pressed AUTO.
As you can see line is bellow center on cold, and there is more noise.
Root temperature is about 18C.
Back in August, root temperature was around 25C. Back then there wasn't such a difference and so I did not pay attention to this. 
Though, what I've noticed, noise is calculated, if we drop vertical scale, noise is going to be less. In picture vertical scale is 10V, if I drop it down to 1V, V, Vpp & RMS will be lower. 





Indeed, now that I began paying attention to the noise, I got scared, prior to reading this thread I thought my scope got broken (after I hooked it up to output of Baofeng UV-5R) 

This is screenshot of scope warmed up & hooked up to internal wavegen, 1.000 0kHz, 1.00Vpp, square

[hgryska]

- Noise: 1,0 - 1,5% related to full scale for all ranges except 10 mV/div (2,0 - 2,5%)
- 9V DC measurement error: 1,4 - 2,1% for 2 and 5 V/div; 1,9 - 3,7% for 10V/div

I did some more testing on my new HDS2102S v4.1.0.

The accuracy values above are valid for a warm device after 30 minutes. In cold state the noise level is twice as high which is significant (see 1st screenshot).

The visibility of the noise (sine wave) in cold state depends on the vertical setting. For 10 mV/div and 500 mV/div settings the input sensitivity is maximum and the sine wave is annoying. For 200 mV/div and 10 V/div the sine wave isn't visible any more. The 2nd screenshot shows a signal measured with 500 mV/div in cold state. The sine wave generated by the HDS2102S input stage is clearly visible and disappears after 30 minutes.

Battery run time with new stock cells: In scope mode after 2:45 h battery indicator shows around 25% and suddenly immediately drops to red. Showing the 'Low Battery' warning the device runs an additional 45 min. In multimeter mode the run time is around 30% longer.

As the scope is only usable after 30 minutes with acceptable accuracy and the battery run time is only around 3+ hours (even in multimeter mode), I meanwhile have doubts that the OWON HDS2102S is suitable for use in the field 

[orb]

I just received my new HDS2102S (v4.1.0). Initially I ordered it because of the ADI ADC. But now I learned in this great forum that it has a LINSI ADC in meanwhile  :'(  Mine shows very similiar noise behavior like discussed on page 26 with nothing attached and DC mode. It is actually not completely noise, but a sine wave in the 50-60 kHz range. If the device is cold, I can even trigger on it and the noise is Vpp 160 mV at 1V/div. If the device warms up, it gets smaller (see attached screen shot). I am curious if HDS242 or 272 show similiar peak-to-peak noise. Can anyone check and post the figure for 1V/div?

@hgryska - picture from post above - is it 1V x1 or x10?


2 * HDS2102S (fw: v3.0.0 & v4.1.0); 1V/div, x1, "high", 4K; cold.

[hgryska]

@hgryska - picture from post above - is it 1V x1 or x10?

1 V/div, x1

Do you also see the sine wave disturber in cold state especially in 500 mV/div or 10 mV/div mode like in the lower screenshot in my previous post?

[orb]

Yes, @10 mV the oscillogram is distorted when the probes are not shorted. You can then see something that looks like a sine wave. Both hds show the same thing. 500 mV/div - the same behaviour, it is more visible at 50 us.

//

HDS2102S -> NEC code from IR tv remote.

[csuhi17]

The HDS2202 has arrived. The battery part is quite lukewarm, and the noise level is also the usual, which is experienced with the others.
The switch-on time is 5-6 seconds.
HW date: 2023-07-05
HD Version V2.4.1
Software version V2.1.0
The rise time of the pulse is 160 ps.

[csuhi17]

I don't know how it worked or what caused it, but it's an interesting bug.
I apologize in advance for the quality.

https://youtu.be/MtkFMSuT1rk

[orb]

I don't know how it worked or what caused it, but it's an interesting bug.
I apologize in advance for the quality.

https://youtu.be/MtkFMSuT1rk

[csuhi17]

I think I found something.
If the memory is set to 8k and.
At 500ms, 50ms, 5ms, 500us /div, I stop it with the stop button.
Then the above bug appears at 200ms, 2ms, 200us 20us /div.
it only appears for me with the above time base.
There is none with 4K memory.

[hgryska]

The visibility of the noise (sine wave) in cold state depends on the vertical setting. For 10 mV/div and 500 mV/div settings the input sensitivity is maximum and the sine wave is annoying. For 200 mV/div and 10 V/div the sine wave isn't visible any more. The 2nd screenshot shows a signal measured with 500 mV/div in cold state. The sine wave generated by the HDS2102S input stage is clearly visible and disappears after 30 minutes.

Thanks to your feedback I returned the device and got it exchanged with another HDS2102S (v4.1.0). The strong noise and sine wave in cold state is gone (see attached screen shot). Actually the noise level after 30 minutes is only slightly lower compared to cold state 

Here are the results of noise evaluation (Vpp relative to full range) in warm and cold state (DC coupling, floating input, x1, sample, 4K, high):

2.5 - 3.0% for 10 and 20 mV/div
1.5 - 2.0% for all other range settings

[orb]

@hgryska, at 10 mV (x1) short the probes (channel 1&2) because what you see is also external noise. If you do this, the internal noise level should reach ~1.600 mV (8K), ~1.200 mV (4K).

[W6EL]

Just curious, I have an HDS272S, and I am wondering if anyone has figured out how to calibrate the DMM. I confess, I did not read all 29 pages of this thread, but read enough to gather that the calibration data is likely stored on eeprom.

I don't really care to attempt to calibrate the scope, I think it's good enough for what it is. But the DMM, showing all those digits... I'd sure like to touch it up.

Thanks in advance,

--E