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Hantek dso2d15 Noise from internal power supply
iw2evk:
Ok,
i've see the video.
2 video for add a heathsink to 2 ic (can reduce noise? i don't think this, maybe work more safetly the ic with less heat )
1 video for create a mains insulation with 2 transformer in cascade (mhh.. this can reduce noise from mains, not the producted from internal circuitery)
no video explain if it's possible place ceramic capacitors for drain to groud rf from +5 , +3,3v etc ..
I see in the video 2 flat cable near the switching power suplly . some ferrite rings on this cables maybe a solution ?
Aldo22:
I had a look at this with the TinySA.
From my point of view, most of the radiation comes from the screen.
In the first picture, the antenna is directly on the LCD.
In the second picture, the antenna is directly at the back of the housing, where the unshielded PSU “radiates”. But that is significantly less.
Then two more measurements at a distance of 40cm (front/rear).
I don't know if you can do much about it.
Much has already been discussed.
78 pages here: https://www.eevblog.com/forum/testgear/new-hantek-dso2x1x-models/
and 273 pages here: https://4pda.to/forum/index.php?showtopic=1018961
nokin:
Long time to come back to Hantek related topic ;D
My experience for this Hantek model are :
1. Noise and noise, lots of noise, no matter how hard you try to improve by any way. It is hardware related due to cheap model.
2. Laggy and laggy
So, change to another brand. Siglent or Rigol. They are more expensive but much better.
iw2evk:
this is my lasr attempt to solve problem:
1 ) ferrite sleve on main cord as a possible closer to female plug
2) ferrite sleve on 2 cable departeing from switching to others parts cloer as a possible to pcb
Nothing again.. the noise decease but not disappear.
Maybe place a copper foil over the switching (with insulation v.s. components )?
the fundamental of swithcing seem about 40 khz , read on scope and received with radio..
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