PDM equipment gathers deposition on a detachable glass witness plate. This allows passive data collection without a measurement device even at site. Long measurement series and parallel measurements are easy to carry out. This is the passive mode.
Furthermore measurements can be carried out with the witness plate on the measuring device allowing events to be catched direct after a short exposure time of the large detector. This is the realtime mode.
Lastly samples are non-destructive measured allowing to measure them again or to extract particles from the witness plate for electron microscope investigation.