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Since the invention of digital readout, machine designers [#permalink]
29 Jan 2008, 05:31
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Since the invention of digital readout, machine designers have rushed to replace conventional dials and gauges with digital units. Yet the digital gauge has drawbacks in some situations. Since it presents an exact numeric value, it must be decoded and analyzed by a human operator; its meaning cannot be read in an instantaneous scanning. An analog dial or gauge can be marked with red to alert the operator when a value is entering a danger zone; a digital gauge cannot. And it is difficult to tell whether a digital readout is increasing or decreasing over time, while the up or down movement of a pointer on an analog gauge can be quickly and easily observed. The author of the passage above would probably recommend the use of digital gauge in cases when I. warning of a sudden rise or fall in value is needed II. an operator must read and interpret several gauges within a few seconds III. a precise numeric value is essential (A) I only (B) III only (C) I and III only (D) II and III only (E) I, II, and III
author basically is saying that digital is only beneficial as it offers a precise number. if you want something for alarms/alerts, you should stick with analog because it it easier for this purpose; same goes for instantaneous reads or to mark the value over time.
Re: cr 1000 test c 8
29 Jan 2008, 18:27