The meters used in measurement have some level of accuracy. There is a probability distribution of measuring the true value, and that distribution curve for the accuracy of the meter has some standard deviation. And the component being measured also has it's own manufacturing distribution that give a probability distribution curve about some ideal value. My question is what will the total distribution curve look like when taking into account both sources of variance in the measurement process? What is this effect called? And how do I calculate it? Thanks.