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Hantek 6022BE 20MHz USB DSO

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mike_58:
I made a small PCB based on "OpenHantek6022_AC_Modification-pdf" - image enclosed.

But I can not figure out where do I need to add text  as stated in last line of pdf: go to the directory build and type
cmake -D HANTEK_AC=1 ../
make -j2

Mike

horo:

--- Quote from: mike_58 on December 19, 2020, 02:26:49 pm ---But I can not figure out where do I need to add text  as stated in last line of pdf: go to the directory build and type
cmake -D HANTEK_AC=1 ../
make -j2

--- End quote ---
This describes the needed actions if you build OH6022 from source (as described on the github page). But if you read the latest AC-mod documentation (that is also linked by OH6022 in the help menu), this is no longer necessary (since June 2020):

--- Quote ---Later OpenHantek6022 versions beginning with 3.1.1 offer an Oscilloscope/Settings option that
allows you to use the modification without the need to compile your own version.

--- End quote ---

Protegimus:
Hi,
  I've recently purchased a 6022BE and I'm keen to do the modifications to reduce the noise floor.
RichardK's instructions were very clear on the electrolytics, however does anyone have values or ideally part descriptions (type, size, etc.) for the additional SMD capacitors added in parallel as described in his original post below?


--- Quote from: RichardK on December 09, 2013, 04:40:41 pm ---...
I added 100uF 16V electrolytics in parallel with the large SMD capacitors after the +5V USB branch and after the +3.3V Regulator.

I also stacked (in a very bodgy fashion) SMD capacitors on top of ALL the bypassing capacitors for the USB Micro and ADC.

Then I stacked SMD Capacitors on the larger of the three SMDs before the DC-DC (C103 & C105) and I stacked the SMD capacitors on the other side, specifically the large ones going between +5 and -5 and the ones going from +5 to GND and -5 to GND, both before and after the Inductors.
...
I used copper foil tape around the DC-DC and grounded it with a braided copper strap (Solder wick). Also, my unit did not come with a heatsink on the ADC (though my board revision is 1.00.2, not 1.00.1) so I added a flat TO220 heatsink mounted with Arctic Silver thermal adhesive and ground strapped with copper braid again.

Figures though, stupid me forgot to acquire some waveforms pre-modification to compare, but from memory I was getting 10-15mv noise and post modification it's down to 3-5mv.

I'll take pictures of the interior later and post them here, as well as some screenshots of the noise floor.
...
The DC-DC datasheet specifies a maximum capacitive load of 100uF so be careful what you add there, and I also plan on populating the Buck & Charge Pump section to see what happens.

--- End quote ---

I expect many owners have done this in the intervening years, so would appreciate any advice.


Edit - BoM for the noise reduction modification and AC mod

   DSO6022 PCB version: 1.00.2   Purpose   Quantity
Mouser No:   769-AQY210EH      2
Mfr. No:   AQY210EH   Solid state relay   
Desc.:   Solid State Relays - PCB Mount Solid State Relays - PCB Mount 130MA 350V 4PIN SPST      
Mouser No:   660-SG73G2ATTD2200D      2
Mfr. No:   SG73G2ATTD2200D      
Desc.:   Thick Film Resistors - SMD Thick Film Resistors - SMD 220 ohm 0.5% 0.5W AEC-Q200      
Mouser No:   660-RN73H2TD1001B10      2
Mfr. No:   RN73H2BTTD1001B10   Current limit resistor   
Desc.:   Thin Film Resistors - SMD Thin Film Resistors - SMD 1K OHM .1% 10PPM 1/4      
Mouser No:   710-30410S      1
Mfr. No:   30410S   EMI shielding (additional option)   
Desc.:   EMI Gaskets, Sheets, Absorbers & Shielding EMI Gaskets, Sheets, Absorbers & Shielding WE-FAS EMI Flex Absb 330x210x1mm w/Adh      
Mouser No:   78-SS2FL4-M3/H      1
Mfr. No:   SS2FL4-M3/H   D22 discrete +5v power supply polarity protection   
Desc.:   Schottky Diodes & Rectifiers Schottky Diodes & Rectifiers If(AV) 2A Vrrm 40V Ifsm 50A DO-219AB      
Mouser No:   80-C0805C104J1RECLR   C8, C29, C37, C99    10
Mfr. No:   C0805C104J1REC7210   C101, C103, C105, C107, C109, C110 bypass capacitor   
Desc.:   Multilayer Ceramic Capacitors MLCC - SMD/SMT Multilayer Ceramic Capacitors MLCC - SMD/SMT 100V 0.1uF X7R 0805 5%      
Mouser No:   80-C0603C104J5R   C28, C55   10
Mfr. No:   C0603C104J5RACTU   C56, C57, C58, C59, C60, C61, C63, C64  bypass capacitor   
Desc.:   Multilayer Ceramic Capacitors MLCC - SMD/SMT Multilayer Ceramic Capacitors MLCC - SMD/SMT 50V 0.1uF X7R 0603 5%      

Mouser part numbers are included for convenience.

softfoot:
I'm keen to make the AC/DC mod to my 6022BE, preferably using the little PCB refered to here, but I have a few questions ...

1. how well does the little PCB work compared to the original mod ??
2. After making either mod (pcb or discrete) do C27/C48 require adjustment ?? and if so how ??
3. Are the PCB "Gerber" files available on line ??

Best regards,
Dave


--- Quote from: mike_58 on December 19, 2020, 02:26:49 pm ---I made a small PCB based on "OpenHantek6022_AC_Modification-pdf" - image enclosed.

But I can not figure out where do I need to add text  as stated in last line of pdf: go to the directory build and type
cmake -D HANTEK_AC=1 ../
make -j2

Mike

--- End quote ---

horo:
1: should be the same performance
2: no
3: I haven't seen any gerber files, but main discussion is there: https://github.com/OpenHantek/OpenHantek6022/discussions/165

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