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PDAs, also known as portable data collectors, are typically compact data collection devices that may be carried from machine to machine to gather information on the health of an asset. Between one to four vibration input channels are typically present in portable devices, and in certain cases temperature, speed, and other process data are also recorded. Their use frequently takes the form of transportable "routes," which include equipment and measurement sites. Waveforms and spectra are recorded by portable data collectors, which can then be evaluated offline or compared to earlier observations to provide a window into the changing asset health conditions.

Capture data on the go (PDA). Periodic snapshots can fill the gap between more expensive online monitoring systems and a complete lack of asset monitoring, which might raise the risk of production interruptions, for lower cost-of-failure assets. However, because Portable data collectors are offline, moving the system from asset to asset is necessary. This can be time-consuming, and as a result, measurements are often taken infrequently, such as once a month. As with every strategy, a balance needs to be taken into account. It is evident that every machine, regardless of how cheap it may be, may profit from a data-driven reliability strategy.

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