Author Topic: Hantek 6022BE 20MHz USB DSO  (Read 657570 times)

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Offline rogerjames99

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Re: Hantek 6022BE 20MHz USB DSO
« Reply #1150 on: August 09, 2020, 05:22:40 pm »
I am using the current github head OpenHantek6022 on a box running Ubuntu Focal and having issues with missing triggers. I can see traces flying past on the screen but trigger does not fire. Changing the timebase some times helps but it is not consistent. I have searched through this thread and seen some mentions of inconsistent triggering on Linux, but nothing definitive. Any suggestions anyone.

The pulse train I trying to stop on is a nice clean square wavr and occurs about once every 10 seconds.
 

Offline horo

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Re: Hantek 6022BE 20MHz USB DSO
« Reply #1151 on: August 10, 2020, 10:07:52 am »
Hi,

tl;dr:
Due to missing trigger hardware the scope is not well suited for detecting sporadic signals, it is best suited for measuring periodic signals in time and frequency domain in the extended AF range (1 Hz to 1 MHz).

More detailed answer:
As the scope has no trigger hardware the triggering happens completely in software
The program samples (free-running) a block, checks if a valid trigger condition exists _and_ if there are enough samples before and after the trigger condition to display a full screen and if these conditions are met it displays the data (and stops the scanning in single mode). In roll and auto mode, non-triggered tracks will also be displayed. You should select the most aggressive sampling in the Oscilloscope/Settings/Minimum Time menu... menu (set to 500┬Ás) to avoid missing the trigger.

Please read this section and have a look at the source code.

Martin

EDIT: it is not related to Linux, it's the missing HW support.
« Last Edit: August 10, 2020, 10:09:49 am by horo »
 

Offline rogerjames99

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Re: Hantek 6022BE 20MHz USB DSO
« Reply #1152 on: August 10, 2020, 11:48:50 am »
Thanks for the detailed and informative reply. I will rack up the sample rate as high possible.

Cheers,
Roger
 

Offline ViktorEEV

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Re: Hantek 6022BE 20MHz USB DSO
« Reply #1153 on: September 04, 2020, 03:17:16 pm »
Here are signed WinUSB drivers for the Hantek 6022BE/BL.
 
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Offline ronee

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Re: Hantek 6022BE 20MHz USB DSO
« Reply #1154 on: October 14, 2020, 01:17:27 am »
Hi everyone,

First post, but first a big thanks to the people who made this Hantek 6022 software!

I had bought of these and on the supplied program I couldn't even get a sine wave to show. I was ready to heave it into the garbage can. But then I discovered the six different programs that might help info on the net and thought to try one or two. I liked this one but windows blocked my XP attemps with "this is not a valid win 32 application" So onto Linux where after many failed attemps I got it working on an old Lenovo.

After some playing around I now have it working nicely! I like the space bar! But the 5 volt input was a potential problem for me.

100X probes were not the answer. However, what If I series two 10X probes? So a little experiment. I had an old probe in the junk box so connected it up and used a 1 meg resistor
to terminate the working probe (it was only 983 ohms so my readings are out a bit but close enough to show that the experiment will work)  All this because I didn't have any 900K resitors to make just a resistor front end. Now that this works that will be my next step.

Some pics of the experiment:

Ron


 

Offline ronee

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Re: Hantek 6022BE 20MHz USB DSO
« Reply #1155 on: October 14, 2020, 01:28:24 am »
con't,
so you see the meter reads 119.4 and my indersized resistor has let OpenHantek display this as 118 volts, not too shabby. This is a 24 volt wall wart feeding a small transformer backwards

Now how about 600 volts pk 2 pk on our 5 volt input? For this I used a 120 to 240 volt transformer. The transformer output was only 226 volts and Open H has this displayed as 220 volts, so down to the wholesalers and see if I can get some 900K resistors tomorrow and I will work on a front end:

Ron

 

Offline rogerjames99

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Re: Hantek 6022BE 20MHz USB DSO
« Reply #1156 on: October 14, 2020, 04:10:40 am »
The max input voltage on this acope is 35v not 5v.
 

Offline ronee

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Re: Hantek 6022BE 20MHz USB DSO
« Reply #1157 on: October 14, 2020, 04:02:08 pm »
The max input voltage on this acope is 35v not 5v.

Roger, with a 1X probe it is 5 volts. Here is screen shot at 10 volts PK/PK with the red ligh on at the bottom left. This is only 3.77 volts RMS.
Ron

 

Offline rogerjames99

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Re: Hantek 6022BE 20MHz USB DSO
« Reply #1158 on: October 14, 2020, 04:58:40 pm »
Mea culpa.

My bad.
35v is the input protection level..

Max. Input +/- 5V(Without external attenuation)
Input protection 35Vpk(DC + peak AC < 10kHz)

Roger
 

Offline ronee

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Re: Hantek 6022BE 20MHz USB DSO
« Reply #1159 on: October 16, 2020, 03:25:05 am »
  All this because I didn't have any 900K resitors to make just a resistor front end. Now that this works that will be my next step.

Well for the simple reason 900K is not in the series. So I ended up with a 680 K and a 220K in series. The capacitor is not show in the photos as I only put that in place once the unit was assembled. Not much selection in the ol' junk box... 14pf didn't do anything and 27pf as installed seems to be not too far over. I think 22 or 24pf would be a better choice but anyway here are a couple pics of the board and a run, the A channel is on rthe test pin and the B channel is from the B&K.

Both scope probes set to 1X. I was expecting the menu item "times" to be 1X, 10X, and 100X but it progresses by single digits? When I put it up to 10X it made the trace smaller and eventually quite.

So last post on this, I was just hoping to inspire 6022be owners to save their money on 100x  probes and build a simple 10X front end.

Ron
« Last Edit: October 16, 2020, 03:00:24 pm by ronee »
 

Offline horo

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Re: Hantek 6022BE 20MHz USB DSO
« Reply #1160 on: October 16, 2020, 07:01:49 pm »
Nice solution, well documented!

I was expecting the menu item "times" to be 1X, 10X, and 100X but it progresses by single digits?
There was a long time discussion on github, where users proposed important probe attenuation values that should also go into the drop-down list:
https://github.com/OpenHantek/OpenHantek6022/issues/33
https://github.com/OpenHantek/OpenHantek6022/issues/37
Finally it was solved by the current solution. Either scroll - or just click into the number and type in your personal probe attenuation between 1..1000, e.g. 103 in your case.
Please look at github: https://github.com/OpenHantek/OpenHantek6022/issues/107

Martin
 

Offline ronee

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Re: Hantek 6022BE 20MHz USB DSO
« Reply #1161 on: October 16, 2020, 10:19:16 pm »
Gotcha, thanks Martin

My little project was a way of saying thanks! see... people are using your program!

Mind you, all I had to buy was the wee box, everything else came out of the junk box. It would cost more if one had to buy BNC fittings.

I had read all of this blog but had not followed the github thread,

Ron
 

Offline zenon

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Re: Hantek 6022BE 20MHz USB DSO
« Reply #1162 on: November 25, 2020, 10:23:02 am »
 
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Offline Cliff Matthews

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Re: Hantek 6022BE 20MHz USB DSO
« Reply #1163 on: November 25, 2020, 12:26:44 pm »
.. my collection ..
Welcome to the forum. Are those PCB photos your mods? (very extensive shielding!  :-+)
 

Offline zenon

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Re: Hantek 6022BE 20MHz USB DSO
« Reply #1164 on: November 25, 2020, 01:33:10 pm »
.. my collection ..
Welcome to the forum. Are those PCB photos your mods? (very extensive shielding!  :-+)

Thanks!
RichardK did the shielding.
https://www.eevblog.com/forum/testgear/hantek-6022be-20mhz-usb-dso/msg344749/#msg344749

I tried to collect all useful software, info, manuals, datasheet etc. about Hantek6022BE.

I intend to make some more mods besides the ones mentioned in the forum (RichardK shielding and additional PSU capacitors).
My intentions are:
1. Separate power supply (5V - done).
2. USB insulation.
3. Separate power supply to the audio part of AD9288 and CY7C68013A, and if possible separate ground plane for these two chips and the input stage (AD8065).

I try to remove nasty hi freq. spikes (noise), but I think that we have bad ground plane.

This piece of hardware is designed very badly, very badly.
No one thought when they designed the hardware.
« Last Edit: November 25, 2020, 01:34:58 pm by zenon »
 


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