I saw an example of calculating RMS voltage for half of a period of a sinusoidal voltage. It seems you can calculate the RMS voltage for half a period of a sinusoidal voltage and then the other half of the period will often have the same RMS value because of the symmetry.
However if voltage changes all the time.. lets say increasing, what will be the most frequent calculation of RMS voltage withing a period that makes sense? is half a cycle (10ms) the most frequent RMS value that makes sense? Does it make sense to calculate the RMS value of voltage for intervals of 5ms or 1ms ?
What is the shortest time that can produce a change in RMS voltage?
My question is related to flicker measurement due to voltage changes. Flicker is measured based on RMS values of voltage and then what is the necessary time resolution for RMS voltage values to accurately measure flicker? How many times per second do you need to measure RMS voltage in order to assess flicker accurately enough?
Please be detailed in your answer and refer to sources. Thank you !