Author Topic: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown  (Read 10622 times)

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Online EEVblog

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EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« on: July 01, 2017, 10:19:03 pm »
Does the Owon XDS3202A Oscilloscope use a true 14bit converter?

 

Online BU508A

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #1 on: July 01, 2017, 10:47:18 pm »
Yep. Will not buy this thing. Not in a 1000 years.
“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 

Offline boffin

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #2 on: July 02, 2017, 01:10:45 am »
Is it me, or is this a really really bad solder connection...

 

Offline Monkeh

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #3 on: July 02, 2017, 01:37:46 am »
Am I nuts, or is that thing on the front panel above the buttons an IR window?

That multimeter board is just waiting to die of a mild static shock. Or Joe's grill igniter. Flimsy Semiconductor..
 

Offline sergioag

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #4 on: July 02, 2017, 06:09:43 am »
Not just the last one. Only the first one would get a "pass" from me. But the last two ones are awful!
 

Offline sergioag

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #5 on: July 02, 2017, 06:17:38 am »
Also their "cooling" solution is laughable...
 

Offline SNGLinks

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #6 on: July 02, 2017, 06:49:45 am »
I wonder if they hope to get better wi-fi by coupling the antenna to the mains?
 

Offline alxpo

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #7 on: July 02, 2017, 08:55:21 am »
I'm fascinated. What is the purpose of this exposed gold?
Why gold? Why exposed?
« Last Edit: July 02, 2017, 08:57:09 am by alxpo »
 

Offline bjcuizon

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #8 on: July 02, 2017, 10:40:37 am »
Hi Dave, you said that the fuse is missing on the PSU board but I think it is in the IEC connector assy. though.
« Last Edit: July 03, 2017, 06:41:25 am by bjcuizon »
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Online EEVblog

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #9 on: July 02, 2017, 12:07:24 pm »
Looks like 3 of those joints are dodgy:
https://www.flickr.com/photos/eevblog/35258313980/in/album-72157682836278374/
Didn't see that on the camcorder LCD.
 

Online EEVblog

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #10 on: July 02, 2017, 12:08:10 pm »
I wonder if they hope to get better wi-fi by coupling the antenna to the mains?

That was my first thought. No idea though.
 

Offline GameProgrammer79

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #11 on: July 02, 2017, 12:15:33 pm »
I know some one in liliput, company that owns owon (sort of o - we won) :-DD
their research is very small and poor  :=\ no review or quality checks  :=\.. if you get it working .. you are a champ  :palm: but I wonder how they have survived so long. They do have a market and somehow they manage to sell a large number of these poorly designed oscilloscopes 
Folks I am getting back in Electronics game after 18 odd years :)
 

Offline nctnico

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #12 on: July 02, 2017, 04:22:34 pm »
Also their "cooling" solution is laughable...
Only if it doesn't do the job.... don't judge a book by it's cover. Having the fan deep inside the case probably reduces the noise a lot so the location of the fan may not be so bad after all.

Sticking the Wifi antenna to the mains input is probably the easiest way to get it far from the metal parts without attaching it to the back shell.
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 
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Offline kayvee

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #13 on: July 02, 2017, 04:33:47 pm »
ENIG plating, the rest has solder paste on top of it  :palm:

I'm fascinated. What is the purpose of this exposed gold?
Why gold? Why exposed?
 

Online Kleinstein

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #14 on: July 02, 2017, 05:17:10 pm »
The chain of vias with exposed gold could be a place where the though they might need to add extra shielding. For a first version and a not so price sensitive board this might be acceptable.

The overall power consumption is not that high. So the cooling might be good enough. I agree that air flow is a little strange.

The DMM part at the back it rather strange - at least a simple 20 mm fuse for the lower current range(s) would be a big plus. This is especially important, as current readings might be an important function - you can read voltages with the scope already. Having an unprotected 10 A or so range is not that bad - not a good instrument for high power circuits anyway. However selecting the 10/20 A range with a different input can be tricky when you can not see the connectors.  This way I would prefer a cheap $10 DMM as a second unit - easy to replace if the shunt is blown and usually a more intuitive UI. It is only possible data logging you don't get with the cheap ones - but who knows if the SW supports this here. An added DMM function would be nice if fast (e.g. audio speed) - like usable as a slow 3rd channel.

Does one really need or even want Wifi on a low noise scope. I would be afraid it could be more trouble with interference than good.

Similar the VGA (or similar) output. Generally it is good to have one at a scope. However why  add a extra chip for a portable instrument with battery option. Good SW support for LAN would be likely as good.
 

Online Fungus

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #15 on: July 02, 2017, 05:42:40 pm »
I don't think that lack of fuses in the multimeter is a problem.

There's plenty of input 'protection' in the form of making it really inconvenient to move the leads to current measurement position. So much so that I expect people will just use a real multimeter for that. Owon saved us a few cents there.  :popcorn:

The VGA output is puzzling. Is there really anybody who'd want that?  :-//

Maybe the VGA output is for a really specialist use like Chinese electronic assembly lines and OWON are hoping to cash in on that.

(In fact  the combination of features on this device is just so weird that I suspect the entire 'scope is an attempt to cash in on one particular, specialist market).

 

Offline Someone

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #16 on: July 02, 2017, 10:27:29 pm »
I don't think that lack of fuses in the multimeter is a problem.
Put any unfused mA meter in a student lab and get the stopwatch ready to time how quickly it will be destroyed.
 
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Offline blacksheeplogic

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #17 on: July 03, 2017, 08:00:57 am »
Put any unfused mA meter in a student lab and get the stopwatch ready to time how quickly it will be destroyed.

Students did not use to be this dumb, my first day at secondary school a teacher canned every one of us boys in his first class. Latter that afternoon a class mate put his feet up on a tool rack in a shop class. Old guy grabbed his cane and gave us another lesson in the use of good judgment. I'm 100% confident that had we been fortunate enough to have the use of a meter in class that it would have survived the year no problem.
 

Online mikeselectricstuff

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #18 on: July 03, 2017, 08:17:51 am »
I don't think that lack of fuses in the multimeter is a problem.

There's plenty of input 'protection' in the form of making it really inconvenient to move the leads to current measurement position. So much so that I expect people will just use a real multimeter for that. Owon saved us a few cents there.  :popcorn:

The VGA output is puzzling. Is there really anybody who'd want that?  :-//

Maybe the VGA output is for a really specialist use like Chinese electronic assembly lines and OWON are hoping to cash in on that.

(In fact  the combination of features on this device is just so weird that I suspect the entire 'scope is an attempt to cash in on one particular, specialist market).
VGA output is entirely reasonable - it's the composite that's really strange (assuming that's what that yellow phono/RCA socket is).
Owon have "previous" for terrible DMM designs. I really can't see how anyone thought it made any sense to include one in a scope like this, less so with the inputs on the back.
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Offline Brumby

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #19 on: July 03, 2017, 08:48:49 am »
I really can't see how anyone thought it made any sense to include one in a scope like this, less so with the inputs on the back.

My hypothetical:
 - New student graduate suggested adding a multimeter
 - Marketing says it's a great idea
 - Executives say "Do it"
 - Management says put it on the back, because re-tooling for the front panel is outside the budget
 - Engineer shakes their head and does what they're told.
 

Offline bktemp

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #20 on: July 03, 2017, 09:23:22 am »
VGA output is entirely reasonable - it's the composite that's really strange (assuming that's what that yellow phono/RCA socket is).
Maybe because the DAC chip can do both?
The CH7026 seems to be a rather advanced video encoder: It has build in 16MBit SDRAM for framerate conversion, a video scaler and other stuff.

But that does not answer why they have used this chip. It doesn't look cheap and they could have used a much cheaper video DAC connected in parallel to the TFT data bus outputting the same 800x600 image.
It looks like they wanted a good quality composite video output for any reason.
 

Online Fungus

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #21 on: July 03, 2017, 10:31:28 am »
I don't think that lack of fuses in the multimeter is a problem.
Put any unfused mA meter in a student lab and get the stopwatch ready to time how quickly it will be destroyed.

I once did a "bring your meter" day at Arduino club and there wasn't a single intact fuse. Not one.

It doesn't help that they usually show a number on screen when the fuse is blown. Most of them assumed the meter was broken or something.

 

Offline Muttley Snickers

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #22 on: July 03, 2017, 11:04:57 am »
It doesn't help that they usually show a number on screen when the fuse is blown. Most of them assumed the meter was broken or something.

You could almost incorporate that right there in some meters as a safety feature for the novice users, should a multimeter be turned on and a fuse blown then an internal counter would be incremented, when the count reaches three the meters display should scroll something like The user of this meter is a dickhead.   :-DMM :-BROKE :palm:
 

Online lowimpedance

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #23 on: July 03, 2017, 11:36:04 am »
 :-DD, I can only imagine what the message would be for a 4th blown fuse!.   :wtf:  :-DD
The odd multimeter or 2 or 3 or 4...or........can't remember !.
 
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Offline GreggD

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Re: EEVblog #1004 - Owon XDS3202A 14bit Oscilloscope Teardown
« Reply #24 on: July 03, 2017, 01:15:49 pm »
Just looked up the NEC UD2-4 relay at Digikey. Twelve types. No stock. Photo shows NEC but the manufacturer is listed as Kemet.
 


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