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In the first case, the AC noise will give contribution to the measured voltage. However, in the second case,the AC noise will give no contribution.
- Keithley Applications
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It is not a RMS or Root Mean Square type of measurement.
The A/D "samples" the input signal for the specific NPLC(Number of Power Line Cycles) and calculates the reading.
So from your perspective it is more of a time averaged measurement and should not be affected by the 10MHz noise.
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