Author Topic: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)  (Read 121563 times)

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Offline Gyro

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #525 on: December 18, 2019, 11:48:06 am »
Hello Chris

It is between diagram and synoptics to understand the operation, I deliberately forgot the decoupling capacitors.
What I find interesting is the hc595 which serves as a serial / parallel interface between the cpu and the inputs (6 lines).
One might think that one of these lines isolates the inputs and authorizes a reference voltage for the auto calibration.
I also highlighted the FPGA series programming.
My model does not have circuits with a red cross.

Alain

Hi Alain,

It's fine - just what is needed to know what is going on.  :-+  It's useful to know which regulator is powering what. I had worked out that the Probe cal output was driven directly from 5V USB - it is a useful indication of excessive voltage drop on the cable before any other functionality is affected.

Mine still has the BA7046 sync separator, yes it's probable that they've moved the functionality into the FPGA, it's a less used function these days anyway.

Regarding the HC595 outputs - it will be interesting to know what is happening under the shield. I think we can be sure this splits down to 3 control lines per channel, I doubt there is any binary decode going on under the shield, so I think they will be switching 3 discrete items. One will clearly be the AC/DC coupling relay. I wouldn't be surprised if another one is switching an attenuator for the higher voltage ranges. As for the third, yes maybe a reference select, or maybe another attenuator? I will try to find out.

Chris
Chris

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Offline camomille

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #526 on: December 18, 2019, 12:06:34 pm »
BA7046 is only NTSC.

small precision, no power goes under the shield, just the ground.

My opinion :
the 6 wires must directly attack 2 bistable relays per channel (AC / DC / GND) and (1V / 0.1V / 0.01V).

It is only a suggestion.

Alain
 

Offline Gyro

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #527 on: December 18, 2019, 12:22:28 pm »
Quote
small precision, no power goes under the shield, just the ground.

Ah, that's interesting, I was thinking there might be another gain stage in there for low ranges. Also clamping to the rails.


P.S. I don't think the GND position is needed on the input coupling relay - the S/W takes the trace to a flat line when GND is selected.

Chris
« Last Edit: December 18, 2019, 12:30:59 pm by Gyro »
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Offline Mikle_JV

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #528 on: December 25, 2019, 06:12:59 am »
Hi guys!
Thank you for your work. I installed the package on a Raspberry pi 4. It works!!
Here is my instruction :
( It certainly looks like dancing with a tambourine.  :rant:  But the Java code gives me the fear, pain and hatred. I hope that in the future it will be corrected by knowledgeable people. )
I installed on a clean system downloaded from the original site "Raspbian Buster with desktop". 
First, the standard:
Code: [Select]
sudo apt-get update
sudo apt-get upgrade

Then install Java and the necessary libraries:

Code: [Select]
sudo apt-get install openjdk-8-jre
sudo apt-get install libusb-1.0-0-dev
sudo apt-get install libusb-dev
sudo apt-get install libusb-java-lib
sudo apt-get install librxtx-java

Install OWON software on two options to choose from:
1)
Code: [Select]
git clone https://github.com/florentbr/OWON-VDS1022.git2)
Code: [Select]
wget https://github.com/florentbr/OWON-VDS1022/archive/master.zip
unzip /home/pi/master.zip


Code: [Select]
cd /home/pi/OWON-VDS1022-master (If you used Git the folder will be OWON-VDS1022 , but I used Wget)
Now we knock on the tambourines:

Code: [Select]
mkdir lib/linux/armhf
cp /usr/lib/arm-linux-gnueabihf/libusb.so /home/pi/OWON-VDS1022-master/lib/linux/armhf/
cp /usr/lib/libusbJava.so.0.8 OWON-VDS1022-master/lib/linux/armhf
cp /usr/lib/libusb.so  /home/pi/OWON-VDS1022-master/lib/linux/armhf
cp /usr/lib/jni/librxtxSerial-2.2pre1.so /home/pi/OWON-VDS1022-master/lib/linux/armhf
   
Edit the installation script in two places:
Code: [Select]
nano /home/pi/OWON-VDS1022-master/install-linux.sh

main () {

        local arch
        case "$(uname -m)" in
                x86_64|amd64) arch=x86_64  ;;
                i?86)         arch=i386    ;;
                arm*)         arch=armhf   ;; #!!!!!!!!!!!!
                *)            raise "Architecture not supported: $(uname -m)"  ;;
        esac


   
build-deb () {
        local arch=$1

#       PK_ARCH=${arch/x86_64/amd64}
        PK_ARCH=$arch   #!!!!!!!!!!!!!!!

Save and exit
Ctrl-X      

Next, change the attribute and run:      
Code: [Select]
sudo chmod +x /home/pi/OWON-VDS1022-master/install-linux.sh
sudo /home/pi/OWON-VDS1022-master/install-linux.sh

After installation we make symbolic links:
Code: [Select]
cd /usr/lib/owon-vds-tiny
sudo ln -s librxtxSerial-2.2pre1.so librxtxSerial.so
sudo ln -s libusbJava.so.0.8 libusbJava.so

Everything is ready now you can run
« Last Edit: December 25, 2019, 07:09:27 am by Mikle_JV »
 
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Offline camomille

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #529 on: December 31, 2019, 08:09:11 am »
Hi all,

Before this new year, I decided to open the sardine box (shield).

in 2020 the complete scheme.

I wish everyone a happy New Year.

Alain  :-+ :-+ :-+
 
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Offline Gyro

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #530 on: December 31, 2019, 10:56:03 am »
Damn, you beat me to it - I was going to make it a New Year present to you!

From an initial look, U2 and U43, the LETEX L1210 parts appear to be opto relays for the AC/DC coupling switch, something like PhotoMOS. These bypass the AC input coupling capacitors, C48 and C20. The 330R resistors, R4 and R97 look right for driving an internal LED.

The relays then must be for switching a high level resistive||capacitive attenuator for the higher volts/div ranges, with capacitive compensation being adjustable by the two trimmer caps.

I can't find any web reference for either LETEX or LETEX L1210, so it is a part that it would be best not to blow up!

Thanks for doing this Alain, and a Happy New Year to you.  :-+

Chris
Chris

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Offline Gyro

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #531 on: December 31, 2019, 11:01:42 am »
Hi guys!
Thank you for your work. I installed the package on a Raspberry pi 4. It works!!
Here is my instruction :
( It certainly looks like dancing with a tambourine.  :rant:  But the Java code gives me the fear, pain and hatred. I hope that in the future it will be corrected by knowledgeable people. )
I installed on a clean system downloaded from the original site "Raspbian Buster with desktop". 
First, the standard:
Code: [Select]
sudo apt-get update
sudo apt-get upgrade

Then install Java and the necessary libraries:

Code: [Select]
sudo apt-get install openjdk-8-jre
sudo apt-get install libusb-1.0-0-dev
sudo apt-get install libusb-dev
sudo apt-get install libusb-java-lib
sudo apt-get install librxtx-java

Install OWON software on two options to choose from:
1)
Code: [Select]
git clone https://github.com/florentbr/OWON-VDS1022.git2)
Code: [Select]
wget https://github.com/florentbr/OWON-VDS1022/archive/master.zip
unzip /home/pi/master.zip


Code: [Select]
cd /home/pi/OWON-VDS1022-master (If you used Git the folder will be OWON-VDS1022 , but I used Wget)
Now we knock on the tambourines:

Code: [Select]
mkdir lib/linux/armhf
cp /usr/lib/arm-linux-gnueabihf/libusb.so /home/pi/OWON-VDS1022-master/lib/linux/armhf/
cp /usr/lib/libusbJava.so.0.8 OWON-VDS1022-master/lib/linux/armhf
cp /usr/lib/libusb.so  /home/pi/OWON-VDS1022-master/lib/linux/armhf
cp /usr/lib/jni/librxtxSerial-2.2pre1.so /home/pi/OWON-VDS1022-master/lib/linux/armhf
   
Edit the installation script in two places:
Code: [Select]
nano /home/pi/OWON-VDS1022-master/install-linux.sh

main () {

        local arch
        case "$(uname -m)" in
                x86_64|amd64) arch=x86_64  ;;
                i?86)         arch=i386    ;;
                arm*)         arch=armhf   ;; #!!!!!!!!!!!!
                *)            raise "Architecture not supported: $(uname -m)"  ;;
        esac


   
build-deb () {
        local arch=$1

#       PK_ARCH=${arch/x86_64/amd64}
        PK_ARCH=$arch   #!!!!!!!!!!!!!!!

Save and exit
Ctrl-X      

Next, change the attribute and run:      
Code: [Select]
sudo chmod +x /home/pi/OWON-VDS1022-master/install-linux.sh
sudo /home/pi/OWON-VDS1022-master/install-linux.sh

After installation we make symbolic links:
Code: [Select]
cd /usr/lib/owon-vds-tiny
sudo ln -s librxtxSerial-2.2pre1.so librxtxSerial.so
sudo ln -s libusbJava.so.0.8 libusbJava.so

Everything is ready now you can run

Hi Mikle_JV,

Welcome to the forum.  :)

Excellent work, I know that several people have ambitions for turning the scope into a truly portable device, and the Pi seems the best platform for doing this. Thanks for detailing so fully!  :-+

Chris
« Last Edit: December 31, 2019, 11:06:42 am by Gyro »
Chris

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Offline camomille

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #532 on: December 31, 2019, 11:31:29 am »
Hello Chris,

It is not LETEX L1210 but LT210 (Photo DMOS-FET Relay) and it is good to use for short circuit the AC / DC input capacitor.

search  LT210.pdf

The NEXEM UD2 5SNU double inverter bistable relay simply switches a divider by 25 used in the 5/2/1 / 0.5 Volts positions.

Alain
« Last Edit: December 31, 2019, 11:38:40 am by camomille »
 
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Offline Gyro

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #533 on: December 31, 2019, 12:44:32 pm »
Ah, that makes more sense, thanks, got it (I had too many disturbing latex hits before :-[)! It looks man enough for the job and decent isolation. Here's the link for anyone else interested... http://www.letex.com.tw/dow.php?type=pdf&file=.%2Fupload%2Fproduct%2FLT210%2Ffile1.pdf&serial=LT210

Divide by 25 then - you're ahead of me again!

Thanks,
Chris


P.S. The single coil bistable relay explains why there are 3 control lines (total) going to each channel.
« Last Edit: December 31, 2019, 12:53:09 pm by Gyro »
Chris

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Offline camomille

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #534 on: December 31, 2019, 01:08:58 pm »
I discovered the division by 25 while having fun making this document.

I am waiting for the components to realize a full scale voltage tester 50v to 500mV and finalized.

 
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Offline Gyro

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #535 on: December 31, 2019, 02:19:21 pm »
Wow, impressive!  :o
« Last Edit: December 31, 2019, 03:07:37 pm by Gyro »
Chris

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Offline camomille

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #536 on: January 01, 2020, 08:20:54 am »
Good morning all

I wish everyone a happy new year.

As promised, here is my latest version of the diagram.

Alain

« Last Edit: January 01, 2020, 08:26:28 am by camomille »
 
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Offline Gyro

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #537 on: January 01, 2020, 05:00:49 pm »
A happy New Year to all.

Thanks very much Alain, an excellent piece of work! Filed  :-+

Chris
« Last Edit: January 01, 2020, 05:49:05 pm by Gyro »
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Offline camomille

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #538 on: January 03, 2020, 10:55:18 am »
Hello,

It seems that we can add the step 2 mV / div.

The modification consists in desoldering the pin 5 AD603 of the printed circuit and soldering a resistance of ~ 5K1 between this isolated pin and the pin 7 to modify the gain of the AD603 which will pass from 31.07dB to 45.05dB(it is provided in the datasheet).

This modification will force you to recalibrate (maybe only the flashmemory.txt file).

I will be testing in the coming weeks to confirm this theory.

« Last Edit: January 03, 2020, 10:56:49 am by camomille »
 
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Offline camomille

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #539 on: January 08, 2020, 04:46:57 pm »
Hello,

florentbr has released a new version which corrects all requests:

https://github.com/florentbr/OWON-VDS1022

But I'm a quiche because I can't install it to test it, do you have any advice ?  |O |O

under W10 no installation possible, under W7 installs without problem, but no launch possible

Alain
« Last Edit: January 08, 2020, 05:27:50 pm by camomille »
 

Offline camomille

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #540 on: January 08, 2020, 05:49:42 pm »
under W10 just decompress directly on the desktop and not in a folder.
 

Offline Gyro

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #541 on: January 08, 2020, 05:52:35 pm »
Hello,

florentbr has released a new version which corrects all requests:

https://github.com/florentbr/OWON-VDS1022

But I'm a quiche because I can't install it to test it, do you have any advice ?  |O |O

under W10 no installation possible, under W7 installs without problem, but no launch possible

Alain

Hi Alain,

I haven't tried florentbr's latest version but I had similar problems to you with what I assume was the previous one. indman's answer worked for me. I don't know if this is the same situation though.

https://www.eevblog.com/forum/testgear/owon-vds1022i-quick-teardown-(versus-the-hantek-6022be)/msg2810072/#msg2810072

Chris
Chris

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Offline camomille

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #542 on: January 08, 2020, 06:15:41 pm »
Hello Chris,

I succeeded under W10, but under W7 impossible, despite your advice and that of Indman that I had read again, but it is less important.

Alain
 

Online indman

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #543 on: January 26, 2020, 01:42:06 pm »
Hi!
Florentbr has once again done a great job of improving the functionality of the program! I got the impression he was reading the topic. :)
I easily installed his latest version of cf9 on my computer with Windows7x64. But to do this, you must meet one condition - to install a specific JAVA8 package. I downloaded it at https://adoptopenjdk.net/ - OpenJDK8U -jdk _ x64 _ windows _ hotspot _ 8u242b08. After installing this package, the install-win.cmd script worked very quickly and without errors.
 

Offline Gyro

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #544 on: January 26, 2020, 02:20:00 pm »
Hi!
Florentbr has once again done a great job of improving the functionality of the program! I got the impression he was reading the topic. :)

He must be - he's pinched a couple of my menu button icons!  :P  (Not that I mind).

I just installed it too, no problems using OpenJDK8U on W7 64pro. It looks very nice at first try!
Chris

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Offline Gyro

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #545 on: January 28, 2020, 03:01:00 pm »
I've had some time to play with Florentbr's s/w version. It seems very good.

The flexibility of colour choice is nice - the FFT trace and cursors too (the pink cursor measurement text always was a pain to see). A couple of points...

- It would be nice if the windows install script gave a choice of install location. I keep all my system stuff on an SSD C drive and most applications on the D drive. I tried hacking the script but ended up with it creating a second D:\Program files folder. That's just my total incompetence though.

- I've always questioned in my mind, the reason for having a 'Restore Factory Defaults' button on the main screen. It seems unnecessary. On Florentbr's version, this button also resets all of your carefully chosen colours!  :palm:  It would be nice just to loose the button, or replace it with something more useful - although I can't think what at the moment. The function is available in the Utility menu for the very rare cases where it might be needed.

- It would of course be nice if it had Alain's proposed 2mV/div range.  :D
« Last Edit: January 28, 2020, 03:02:31 pm by Gyro »
Chris

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Offline camomille

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #546 on: January 28, 2020, 04:22:07 pm »
Hi all,

sorry for my absence from the forum, but I had a cut in the fiber network for 2 weeks.  :--

Thanks to indman for the link, which allowed me to install the cf9 version on W7 and W10 without problem (the cf7 version had problems closing selectors). :-+

I advance on my calibrator, I still lack 1 resistance value for the 2mV/Div (20mV full scale) caliber and with Chinese problems I don't know when I will have it  ?  :-//

Alain
« Last Edit: January 28, 2020, 04:24:11 pm by camomille »
 

Offline Gyro

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #547 on: January 28, 2020, 08:12:39 pm »
Thanks for the update Alain. You don't realize how much you rely on broadband until it breaks!

Chris

P.S. Florent's calibration comments shed light on the difference between the Zero Compensation and Zero Amplitude. One is for zeroing at mid point and the other to maintain zero tracking when the trace is moved vertically on the screen (makes sense). What doesn't make sense is why my CH2 isn't perfectly optimized by Autocal.
« Last Edit: January 28, 2020, 09:00:08 pm by Gyro »
Chris

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Offline camomille

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #548 on: January 29, 2020, 08:16:53 am »
Hi Chris,

My goal is to better understand the action on the amplitude of the COARSEGAIN values (pwm to dc U26) and to know if we can improve the slope.

My idea is that thanks to my calibrator I can check the voltage at the output of the AD603 in full scale and on all games it must be fixed at 1.7V (2.048 / 12 * 10).

The STEP and ZERO voltage offsets are less important to me because the dac in SIM3U156 has great precision (not like rc of U26)

All this for fun.

Alain
 

Offline camomille

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Re: OWON VDS1022I Quick Teardown (versus the Hantek 6022be)
« Reply #549 on: January 29, 2020, 02:21:01 pm »
I finished my full scale voltage calibrator for oscilloscope

Available voltages: 50/20/10/5/2/1 / 0.5 / 0.2 / 0.1 / 0.05 / 0.02 Volts

accuracy <1%

All for less than $ 4

 


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