Chapter 41. Display and Recording
Display devices are used in instrumentation systems to provide instantaneous but non-permanent communication of information between a process or system and a human observer. The data can be presented to the observer in either an analog or a digital form. Analog indicators require the observer to interpolate the reading when it occurs between two scale values, which requires some skill on the part of the observer. They are, however, particularly useful for providing an overview of the process or system and an indication of trends when an assessment of data from a large number of sources has to be quickly assimilated. Data displayed in a digital form require little skill from the ...