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Products => Test Equipment => Topic started by: Audiodave on September 16, 2020, 10:41:07 pm

Title: SDS7102V noise solved
Post by: Audiodave on September 16, 2020, 10:41:07 pm

Hi, My SDS7102V is fitted with the later power pcb, I had 2 types of noise, spikes from the power supply and signal noise, the 2 should not be confused, after reading many posts here I decided to take a look, as the newer power pcb has all the extra smd ceramic caps and other mods I decided to look elsewhere, I did the D127 mod, this made a big improvement, next I used 25mm copper emi tape across the foil/ferrite to the display, insulated with pvc tape, the copper foil bonds extremely well to the chassis, I did the same across the adapter board over L2 etc, ALL the spikes have gone on both channels, the noise floor is as pictured scope is at 2mv/div pics are grounded and probe in the air, if sufficient interest I will open it back up and take pics.

Title: Re: SDS7102V noise solved
Post by: Audiodave on September 16, 2020, 10:45:55 pm

Tip grounded.

Title: Re: SDS7102V noise solved
Post by: Audiodave on September 16, 2020, 10:48:20 pm

The D127 mod, thanks to who devised this!

Title: Re: SDS7102V noise solved
Post by: masterx81 on September 17, 2020, 06:18:23 am

Hi! Interesting, but i've not fully understood how have you placed the emi adhesive tape.
The noise seem really good fpr this scope.