A cheap, simple kind of meter can be made using a string of
light-emitting diodes (LEDs) or a liquid-crystal display (LCD) along with a
digital scale, to indicate approximate levels of current, voltage or power.
This type of meter has no moving parts to break, just like a digital meter. But
it also offers the relative-reading feeling you get with an analog meter.
Figure below is an example of a bar-graph meter that is used to show the
power output, in kilowatts, for a radio transmitter. It indicates 0.8 kW or 800
watts, approximately.
The chief disadvantage of the bar-graph meter is that it isn’t very
accurate. For this reason it is not generally used in laboratory testing. The
LED or LCD devices sometimes also flicker when the level is “between” two
values given by the bars. This can be annoying to some people.
Bar-graph meters
Reviewed by Bibi Mohanan
on
June 19, 2016
Rating:
Reviewed by Bibi Mohanan
on
June 19, 2016
Rating:
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