What unit is in/s read in?

The correct answer is PK, which stands for Peak. In vibration analysis, particularly when discussing displacement or vibration levels, the PK reading represents the maximum amplitude of vibration measured from the baseline to the peak of the wave form. This is crucial in understanding the severity of vibration, as it provides insights into the potential impact on machinery and equipment.

When performing vibration analysis, it's essential for technicians and engineers to recognize the significance of these measurements. PK reflects the highest point that the vibration reaches, ensuring that one can assess extreme conditions that need to be managed to avoid damage.

The other options, while related to various measurement methods and standards, do not directly pertain to the specific unit in which in/s (inches per second) is read. RMS (Root Mean Square) is a different measurement approach focused on the effective value of varying amplitudes, and Standard and Imperial refer to broader classifications of units rather than specific values used in vibration analysis. Recognizing PK as a crucial performance indicator aids in proactive maintenance and operational efficiency in various mechanical systems.