barcode printing using vb.net Measuring devices in Software

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58 Measuring devices
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3-12 A VU meter. The heavy scale is usually red, indicating high risk of audio distortion.
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3-13 A sound-level meter.
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Light meters
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Light intensity is measured by means of a light meter or illumination meter. You might think that it s easy to make this kind of meter by connecting a milliammeter to a solar (photovoltaic) cell. And this is, in fact, a good way to construct an inexpensive light meter (Fig. 3-14). More sophisticated devices might use dc amplifiers to enhance sensitivity and to allow for several different ranges of readings.
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3-14 A simple light meter.
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One problem with this design is that solar cells are not sensitive to light at exactly the same wavelengths as human eyes. This can be overcome by placing a colored filter in front of the solar cell, so that the solar cell becomes sensitive to the same wavelengths, in the same proportions, as human eyes. Another problem is calibrating the meter. This must usually be done at the factory, in units such as lumens or candela. It s not important that you know the precise definitions of these units in electricity and electronics.
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Other specialized meter types 59 Sometimes, meters such as the one in Fig. 3-14 are used to measure infrared or ultraviolet intensity. Different types of photovoltaic cells have peak sensitivity at different wavelengths. Filters can be used to block out wavelengths that you don t want the meter to detect.
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A meter movement can be equipped with a marking device, usually a pen, to keep a graphic record of the level of some quantity with respect to time. Such a device is called a pen recorder. The paper, with a calibrated scale, is taped to a rotating drum. The drum, driven by a clock motor, turns at a slow rate, such as one revolution per hour or one revolution in 24 hours. A simplified drawing of a pen recorder is shown in Fig. 3-15.
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3-15 Simplified drawing of a pen recorder.
A device of this kind, along with a wattmeter, might be employed to get a reading of the power consumed by your household at various times during the day. In this way you might tell when you use the most power, and at what particular times you might be using too much.
Oscilloscopes
Another graphic meter is the oscilloscope. This measures and records quantities that vary rapidly, at rates of hundreds, thousands, or millions of times per second. It creates a graph by throwing a beam of electrons at a phosphor screen. A cathode-ray tube, similar to the kind in a television set, is employed. Oscilloscopes are useful for looking at the shapes of signal waveforms, and also for measuring peak signal levels (rather than just the effective levels). An oscilloscope can also be used to approximately measure the frequency of a waveform. The horizontal scale of an oscilloscope shows time, and the vertical scale shows instantaneous voltage. An oscilloscope can indirectly measure power or current, by using a known value of resistance across the input terminals.
60 Measuring devices Technicians and engineers develop a sense of what a signal waveform should look like, and then they can often tell, by observing the oscilloscope display, whether or not the circuit under test is behaving the way it should. This is a subjective kind of measurement, since it is qualitative as well as quantitative. If a wave shape looks wrong, it might indicate distortion in a circuit, or possibly even betray a burned-out component someplace.
Bar-graph meters
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 3-16 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.
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