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To check the default voltage noise, the probe's (+) pin and (-) pin were connected to ground. However, even with X1 attenuation, 5mV of unknown voltage noise occurs as shown in the figure. Please tell me how to reject this noise. (the AC coupled option cannot be used.)
The attached figure has an offset voltage of 972mV. As explained above, even if ground is connected, the same waveform is output as shown in the figure.
The figure shows a 2us/DIV measurement, but even at 50ns/DIV, a 5mV noise waveform still occurs. And in the figure, the offset voltage is 982mV, so please think that it is 0V.
Attenuation: 1: 1
1mV/DIV & 50ns/DIV or 1mV/DIV & 2us/DIV
If you are up to evaluate voltage noise under load, you should use resistive load all times.
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