Author Topic: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG  (Read 229317 times)

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Offline mojoe

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #750 on: March 04, 2024, 07:32:51 am »
I don't know if you've seen this video, but W2AEW did this on a breadboard:

I'll have to say, that yours is the nicest looking one using this simple design. I'm going to box up my cobbled together version, but it will be in a plain looking project box :)

Of course, the idea of a curve tracer (octopus) is quite old. There are several ways to make one. Years ago, I made a traditional one, using a 6 V transformer.

I've been playing about a bit with scope settings and resistor values. First, I found that you need to use DC coupling, as AC coupling will cause the trace to move downward when you attach a component, like a diode.

I decided to only use 3 V from the SG, as this is enough for even LEDs, but not enough to blow up 3.3 V ICs. With this change, I had to go with a 47 Ohm resistor between the SG and Ch 1. I set Ch1 (X) to 500 mV/div to get more resolution on the voltage knee for diodes. I set Ch2 (Y) to 50 mV/div to keep the trace on the screen, with the voltage and resistor I am using. The 200 us that you used still works fine.

My mistake. I forgot that the sinewave is 5 Vpp,  not RMS. At 5 V, it wouldn't work with a blue or white LED.

Thanks for posting about your version. It integrates very nicely with the Owon scope.
« Last Edit: March 05, 2024, 01:48:19 am by mojoe »
 
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Offline bungle

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #751 on: March 05, 2024, 05:34:38 am »
I don't know if you've seen this video, but W2AEW did this on a breadboard:

I'll have to say, that yours is the nicest looking one using this simple design. I'm going to box up my cobbled together version, but it will be in a plain looking project box :)

Of course, the idea of a curve tracer (octopus) is quite old. There are several ways to make one. Years ago, I made a traditional one, using a 6 V transformer.

I've been playing about a bit with scope settings and resistor values. First, I found that you need to use DC coupling, as AC coupling will cause the trace to move downward when you attach a component, like a diode.

I decided to only use 3 V from the SG, as this is enough for even LEDs, but not enough to blow up 3.3 V ICs. With this change, I had to go with a 47 Ohm resistor between the SG and Ch 1. I set Ch1 (X) to 500 mV/div to get more resolution on the voltage knee for diodes. I set Ch2 (Y) to 50 mV/div to keep the trace on the screen, with the voltage and resistor I am using. The 200 us that you used still works fine.

My mistake. I forgot that the sinewave is 5 Vpp,  not RMS. At 5 V, it wouldn't work with a blue or white LED.

Thanks for posting about your version. It integrates very nicely with the Owon scope.

I hadn’t seen that particular video before, I looked at a couple of other similar ideas though.

I own an octopus tracer and a couple of real scopes, so my use case for this wasn’t to replace those. Nor was it to even attempt to replicate the increased functionality that us possible when you have PSU/transformer to play with.

Rather i was looking at what was possible using just the built in functions, specifically not needing extra cables or a psu. Being a portable scope, it  seemed most useful to be able to use the tracer adapter without then needing power or carrying a lot of extra pieces.

This way it can be used not just mobile but also when operating isolated from mains ground is important.

Also as it seems like a lot of beginners might have the HDS as their first and only scope, and likely not also own an external sig-gen, so it should work for them also.

As it turns out though, you can separate it from the owon, connecting X and Y with bnc cables, and use an external sig-gen to provide a 12V or greater sine and you can then view zeners above 5V etc also.
I am thinking of adding a dedicated bnc for that on the banana side with a switch to selectand a higher value series current limiting resistor.

btw,if you want to use the enclosure I found that almost exactly matches the owon dimensions, you can get it from Amazon or at least get the specs from the listing…

https://a.co/d/9SRdW1Z

and bnc couplers from Amazon come in sets of 5 cheap, they are made of crappy pot metal but saves me keeping 3 of my real ones in the a kit that’ll only get used occasionally

https://a.co/d/5z3ZSV2
« Last Edit: March 05, 2024, 05:55:02 am by bungle »
 

Offline mojoe

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #752 on: March 05, 2024, 07:01:10 am »
Yes, the dimensions of that box are just about perfect. I measured my scope earlier, and came up with pretty much the same dimensions. I think I'll 3D print a box, as at audio frequencies, a metal box is not needed.
 

Offline bobxyz

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #753 on: March 20, 2024, 04:28:08 am »
Has anyone figured out exactly what the HORizontal Refresh High/Low mode does?  The manual simply says:
  Set the refresh rate to "High" or "Low".

It seems to also be a persistence on/off control.  Any idea how many frames of persistence is enabled in High mode?  Is it timebase dependent?
 

Offline csuhi17

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #754 on: March 20, 2024, 06:09:54 am »
Has anyone figured out exactly what the HORizontal Refresh High/Low mode does?  The manual simply says:
  Set the refresh rate to "High" or "Low".

It seems to also be a persistence on/off control.  Any idea how many frames of persistence is enabled in High mode?  Is it timebase dependent?

It seems to me that it increases the update of the waveform on the display.
if you send a swept signal to it, you can see that the amount of rising edges increases, but so does the thickness of the line.

It's not similar to persistence at least, I tested it on my Micsig with the lowest setting of 100ms and the two signals looked different.
Fnirsi oscilloscope = waste&regret
 

Offline bobxyz

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #755 on: March 20, 2024, 05:13:52 pm »
Here's an example of what I see when looking at CANbus with Refresh set to High and then Low:


The Refresh=High seems to have a fraction of a second of persistence.  When stopped, if I shift the waveform left/right, the extra overlaid waves disappear and only a single trace remains (just like the Refresh=Low example)
 
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Offline Evgeny

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #756 on: March 21, 2024, 02:10:36 pm »
This is the refresh rate of the screen.
 

Offline mixail

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #757 on: March 24, 2024, 10:20:47 am »
Hello everyone, our oscilloscopes have pretty decent software. Need help with code
https://github.com/seritools/owowon
 

Online Anthocyanina

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #758 on: April 08, 2024, 10:17:38 pm »
Thanks, yeah, no new firmware available from farnell's site. i got this from a contest, so it seems no warranty, which sucks, I'll look around and see if the owon firmware is fully compatible. The board and everything inside just carries the owon part numbers, so the hardware should be the same, but who knows if if will recognize the owon firmware without any fiddling.

Thank you

That's a good question, because multicomp reduce the memory in the 242 and 272 series to 6k for some reason?
The Owon firmware is a bit tricky, there are multiple hardware and software editions.
My 272s is V3 and if I see correctly they are already at V6. |O

If you simply have an Owon, you can see its data in the menu item System/System/F4/About.
You can use the Version number to get the latest firmware from the owon site.
If multucomp specified its own numbering, it can be difficult.
It might help to identify if you share the version number and production date from the board.

element14 replaced my defective unit. the new unit shows V6 for firmware and it is also a newer hardware revision. one thing i'm not happy with with the replacement unit is that channel 2's vertical accuracy is significantly off in the higher voltage range, not unusably off, but enough that it bothers me. a 16vpp signal reads 15.6 on channel 2, and reads 15.92 on channel 1. that's about 2.5% from what it should be, so still within spec, but still annoying to see, especially when the other channel reads much closer to the actual value.
 

Offline diegobo

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #759 on: April 17, 2024, 06:20:47 pm »
hey, a got the hds272s. hw version 2.1 and software 7.2. Does anyone know if there is a newer firmware for this one?
thanks
« Last Edit: April 17, 2024, 06:23:58 pm by diegobo »
 

Online Anthocyanina

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #760 on: April 30, 2024, 02:23:59 am »
The low battery message when the battery is still far from low is very annoying, i tried powering the scope from a bench supply,but all i get is some quiet clicky noises. the supply is set at 4V, and with current limits from 100mA to basically unlimited, this behaviour doesn't change. i don't understand what's going on, because with a single battery installed it turns on fine, and if i connect a battery and the power supply, then remove the battery, it stays on for a few seconds after battery removal and then switches itself off. could anyone try to power this scope with a bench supply and see what happens?

Thank you!
 

Offline csuhi17

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #761 on: April 30, 2024, 03:33:55 am »
The low battery message when the battery is still far from low is very annoying, i tried powering the scope from a bench supply,but all i get is some quiet clicky noises. the supply is set at 4V, and with current limits from 100mA to basically unlimited, this behaviour doesn't change. i don't understand what's going on, because with a single battery installed it turns on fine, and if i connect a battery and the power supply, then remove the battery, it stays on for a few seconds after battery removal and then switches itself off. could anyone try to power this scope with a bench supply and see what happens?

Thank you!

current limit up to 1A!!
3.97V -> 0.709A for HDS272S
1.357A for HDS2202

What you wrote also works for me, only with a battery. The annoying relay clicking was done when I gave the HDS272s a small current limit. If you have another scope, check whether the voltage of the power supply does not drop drastically when you plug it in, to see if that is why it cannot start.
There was no relay clicking on the HDS2022.
The device turned itself off at around 3.76V.
« Last Edit: April 30, 2024, 03:44:10 am by csuhi17 »
Fnirsi oscilloscope = waste&regret
 

Offline sova

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #762 on: May 08, 2024, 12:42:15 pm »
Hi! I have problem with my HDS2202s. My multimeter does not work. I found that isolation transformer (near the speaker) is warm. When I directly connect the 0660 chip to 3.0V, the multimeter starts working correctly.
One side of the transformer has a resistance of 3.0 ohms, the other: 4.3 ohms. Can you check please your transformer resistance? Thanks  :)

Here is my 0660 chip eeprom dump. I read it while trouble-shooting. I decided to leave it here, in case someone needs it.
Code: [Select]
ff ff ff ff ff ff ff ff ff 52 00 fa 00 e8 d4 03
20 4e 20 4e 6c 07 64 4b 64 4b ff 3b 0a ff 40 ff
32 9b 54 7e e8 03 dc 05 00 80 c2 7e 39 80 d6 96
4e 02 09 86 05 0a dd fe 09 fe ff 09 1e fe 09 00
00 01 00 01 00 07 98 00 64 00 64 00 64 00 00 00
00 80 00 80 00 80 00 80 00 80 00 80 00 80 00 80
ea 7b 02 80 01 00 e8 2b 00 00 00 00 00 00 00 00
bc 85 00 80 38 87 88 7b 0b 02 00 00 00 00 00 00
00 01 00 03 00 10 14 0e 00 0c 1e 07 13 12 0b 00
00 02 00 04 00 11 00 0f 00 0d 00 09 15 00 00 00
00 00 00 00 00 00 00 00 00 00 00 0a 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0d 00 02 20 0d 00 03 20 20 00 03 20 20 00 03 10
41 00 03 08 41 00 03 05 41 00 03 05 0d 00 02 20
e2 f1 0b 80 00 80 04 80 21 80 2e 80 30 80 00 80
00 80 00 80 00 80 00 80 5a c6 c6 1e 3c 00 00 00
 

Offline csuhi17

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #763 on: May 08, 2024, 01:04:11 pm »
HDS2202
No value was measured between the middle legs.
I measured 5 Ohms on the two outermost legs on the DMM side.
I measured 4.3 Ohms on the two outermost legs on the buzzer side.
Fnirsi oscilloscope = waste&regret
 
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Offline sova

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #764 on: May 08, 2024, 10:43:03 pm »
HDS2202
No value was measured between the middle legs.
I measured 5 Ohms on the two outermost legs on the DMM side.
I measured 4.3 Ohms on the two outermost legs on the buzzer side.
Thanks! I make quick and dirty 13 mm transformer. It works and it cold. All I have to do is wind the original 10mm transformer 8)
 

Offline electr_peter

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #765 on: May 19, 2024, 12:56:36 pm »
Noticed trigger sensitivity issue (bug?) limitation in HDS2102S (FW V4.1.0). Trigger does not work with low trigger levels for rising edge and with high trigger levels for falling edge. Same issue on Ch1 and CH2, auto/normal/single triggering, various amplitudes, various signal levels, various sensitivity levels.

Setup - feed in square wave (500kHz, 1.5Vpp, 750mV offset) to CH1 with DC coupling 500mV/div. Offset CH1 by 3 div so that waveform fits on the screen.
Set trigger on CH1 to DC coupling, rising edge. With trigger level 180mV and higher (up to 3V), it triggers (OK). With trigger level 160mV and lower, it doesn't trigger (not OK).
Set trigger on CH1 to DC coupling, falling edge. With trigger level 2.98V and lower (up to 0V), it triggers (OK). With trigger level 2.96V and higher, it doesn't trigger (not OK).
CH1 min/max measurements are -40mV/3.180V, so error (insensitivity) is ~200mV on 500mV/div scale.

Feels like it is digital processing issue, that is a bug IMO.
« Last Edit: May 19, 2024, 05:53:48 pm by electr_peter »
 

Offline csuhi17

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #766 on: May 19, 2024, 02:55:33 pm »
try to put the whole wave on the screen and test it with 200mV/div.
then try it in 1V/Div.
and see how big the difference is.
I me approx. 0.2-0.4 Div.

This is normal, because it takes some time for the scope to decide if this is a trigger event or not.
The other scopes have this too.
At least with the ones I have for sure.
Fnirsi oscilloscope = waste&regret
 

Offline electr_peter

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #767 on: May 19, 2024, 04:35:07 pm »
Rechecked, HDS2102S triggers from about ~0.3 div. Tested on "normal" scopes - surprisingly, they also require at least ~0.25 div to trigger, i.e. for rising edge trigger level must be minimum signal + 0.25 div and for falling edge maximum signal - 0.25 div.

Maybe it is a thing related to analog trigger logic? IIRC, fully digital trigger on some advanced R&S scopes is more sensitive.
 

Offline csuhi17

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #768 on: May 19, 2024, 05:13:32 pm »
Rechecked, HDS2102S triggers from about ~0.3 div. Tested on "normal" scopes - surprisingly, they also require at least ~0.25 div to trigger, i.e. for rising edge trigger level must be minimum signal + 0.25 div and for falling edge maximum signal - 0.25 div.

Maybe it is a thing related to analog trigger logic? IIRC, fully digital trigger on some advanced R&S scopes is more sensitive.

On Owon's website, it says in the description that "Trigger electrical level accuracy : +- 0.3 div." I think this applies to this.
Fnirsi oscilloscope = waste&regret
 

Offline electr_peter

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #769 on: May 19, 2024, 06:11:23 pm »
On Owon's website, it says in the description that "Trigger electrical level accuracy : +- 0.3 div." I think this applies to this.
That is not exactly "trigger sensitivity", but close enough. Siglent SGSx000X HD manuals state both trigger accuracy and trigger sensitivity.
Measured 0.3 div sensitivity is on par with Owon and other scope manuals. So this is not a bug, but a subtle feature (limitation).

I still think that sensitivity limitation is partly to hardcoded analog trigger implementation and can be made more sensitive by user parameters on case by case basis. With more sensitivity too many "false" triggers likely arises so it is done this way.
White paper from R&S Why digital triggering matters mentions that better than 0.1 div sensitivity is possible only with digital triggeting (as it allows custom sensitivity thresholds).
 

Offline elantric

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #770 on: May 19, 2024, 08:22:05 pm »
i recently got a multicomp pro mp720781 which is an owon hds242s and while at first i was impressed with its scope performance, lately i've found it to be horribly annoying, with it shutting off at random. sometimes i turn it on and it immediately turns off, sometimes it lasts a few seconds on, sometimes a few minutes, sometimes it doesn't turn itself off at all. it doesn't matter if it's fully charged, or if it's plugged into the charger, or if its battery is almost discharged. this behaviour has made it really horrible to use.

has anyone experienced this with their hds?

Thank you!

I also own an Owon HDS272, Had to open and replace the two original 18650 batteries,  they would no longer charge -

I replaced with these https://www.amazon.com/gp/product/B0BWDPVXSQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
 

Offline electr_peter

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #771 on: May 21, 2024, 04:21:27 pm »
Immediately after turn-on, trigger level on CH2 is not correctly restored in HDS2102S (FW V4.1.0).
Trigger level triangle is in the same place as before turn-off, but actual trigger level is 1 div above center line (obvious with varying DC bias square wave signal in AUTO mode).
Adjusting trigger re-enables correct trigger level. CH1 trigger restores previous level correctly, only CH2 has this bug. Thus trigger level must be adjusted every time after turn-on with trigger source as CH2.
« Last Edit: May 21, 2024, 04:29:10 pm by electr_peter »
 

Offline papabol_24

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #772 on: May 22, 2024, 03:03:14 pm »
Got mine with
7.1.1 firmware
2.1 Main board
223xxxx SN

Issue with the continuity buzzer in multimeter mode is its very slow and beeps twice before displaying 0.0 ohms.
 

Offline memed

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #773 on: June 10, 2024, 07:08:44 am »
Here's an example of what I see when looking at CANbus with Refresh set to High and then Low:
(Attachment Link) (Attachment Link)

The Refresh=High seems to have a fraction of a second of persistence.  When stopped, if I shift the waveform left/right, the extra overlaid waves disappear and only a single trace remains (just like the Refresh=Low example)
What Owon model you have used there?
 

Offline TomKatt

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Re: OWON HDS 200 Handheld Oscilloscope w/ builtin DMM/AWG
« Reply #774 on: June 10, 2024, 12:44:16 pm »
One problem with Owon / Hantek is they seem to constantly modify their pcb design based on what inexpensive surplus parts are available at the time.  The result is many different hardware versions of the same product, which beyond possibly affecting operation or performance can also require different FW to run.  This leads to a lot of variations in performance from version to version and also reduces likelihood of FW updates, since they need to create FW for several hardware boards of the same product.  If you get a product from these companies and it works well, you cannot necessarily expect earlier or later versions to operate the same way - there is a LOT of variability in their products.  And if you discover software bugs, you cannot always assume they will address them with future updates.  Same applies for clone products from other companies that all share the same basic BOM - they all look the same, but can operate very differently.

I have old Owon HDS1021M and it still works ok for what it is but never a FW update for my version - instead they release new HDS1021M-N version which is the same product but different pcb.  Very frustrating.
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