TS 295

TS 295. OFFICIAL SCOPE IS UNAVAILABLE. This standard is concerned with the quantities and SI units used for periodic and related phenomena, providing a terminology and classification framework for measurements that vary with time. The title points to time-dependent physical quantities, repeating processes, and the unit conventions used to describe them, which matters for consistency in technical communication and measurement practice.

Technical meaning of units for periodic quantities

In general technical use, periodic phenomena include vibration, oscillation, rotation, waves, and other repeating behaviors. In these cases, concepts such as frequency, period, angular frequency, phase, and amplitude are considered together. The SI system provides a common language for expressing such quantities so that results can be interpreted consistently across different engineering fields.

The practical value of a standard like this is to reduce ambiguity when the same physical phenomenon is described with different terms or unit conventions in different disciplines. It is especially relevant in mechanical vibration, electrical alternating quantities, acoustic signals, and wave-related engineering, where the pairing of quantity and unit is fundamental to measurement records and technical exchange.

• Naming the key quantities used in periodic measurements
• Matching SI units to the relevant quantities
• Creating a common terminology for engineering and metrology
• Presenting time-varying physical quantities consistently