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How to reduce noise on digital oscilloscope?
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smaultre:
When you tested DUT, does you apply any galvanic isolation (powering scope by standalone UPS/Battary) techniques preventing ground loops ?
tautech:

--- Quote from: sonielkraf on October 22, 2024, 01:08:41 am ---I try measure all sinewave is same result,
The scope condition if testing signal calibration on 1khz is same, the signal is not smooth,



--- End quote ---
I see some error.
Have you run the Self Cal ?

When a channel is AC coupled the Probe Compensation signal should be 50% above and below the 0V position.
Also the Trigger level is outside the waveform amplitude so press the Level encoder to set to 50% of the waveform amplitude.
sonielkraf:
I was self calibration sir, but this result, any problem with powersupply,? I test voltage as service manual is normally to...
pcprogrammer:

--- Quote from: indman on October 22, 2024, 05:34:50 am ---The fact that you see a distorted sinusoid does not refer to noise, but probably a strong interference with the signal either from the circuitry of the board or from a long wire on the ground contact probe, which you as an antenna catch this interference.

--- End quote ---

This is a very good observation. Looking at the photo showing the probe connection on the board, there are three coils besides the probe tip, and with the ground lead "miles" away from the scoping point, it easily picks up the signals the coils may emit. Looking at the signal on the scope it shows switching spikes. So are these coils part of a switching supply?

Try winding a lead around the probe tip and connected it to ground at a point near to where you are probing and make it your probe ground connection too.

The small noise on the calibration signal looks like just a couple of bits in the digitization and is fairly normal. A electrically noisy environment can make it a bit worse, but does not invalidate the signal you see.
Fungus:

--- Quote from: sonielkraf on October 22, 2024, 01:08:41 am ---I try measure all sinewave is same result,
The scope condition if testing signal calibration on 1khz is same, the signal is not smooth,

I zoom it's, like any noise, why, my scope is not normally?

--- End quote ---

It's normal

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