In which unit is MM/S read?

The unit MM/S, which stands for millimeters per second, is typically used to measure the velocity of vibration. In the context of vibration analysis, RMS (Root Mean Square) is a statistical measure used to represent the effective value of fluctuating quantities, such as vibrations. When measurements are expressed in terms of MM/S, it often refers to the RMS value of the vibration velocity, as this metric gives a more meaningful representation of the overall intensity of the vibration over time. RMS values help in assessing the severity of vibrations and provide a standard for comparisons in vibration analysis, making it easier for analysts to determine whether the levels are within acceptable limits or indicative of potential issues.

The other options, while relevant in different contexts of vibration measurement, do not directly pertain to the unit MM/S, as they either represent different forms of measurement or are not standard practices for expressing velocity in this case.