1-50The pointer on the right-hand dial (fig. 1-46) registers 1 kilowatt-hour, or 1,000 watt-hours, for eachdivision of the dial. A complete revolution of the hand on this dial will move the hand of the second dialone division and register 10 kilowatt-hours, or 10,000 watt-hours. A complete revolution of the hand ofthe second dial will move the third hand one division and register 100 kilowatt-hours or 100,000watt-hours, and so on.Figure 1-46.—Watt-hour meter.Accordingly, you must read the hands from left to right, and add three zeros to the reading of thelowest dial to obtain the reading of the meter in watt-hours. The dial hands should always be read asindicating the figure which they have LAST PASSED, and not the one they are approaching.Q60.Why would you use a hook-on voltameter instead of a multimeter?Q61.What electrical quantity is measured by a wattmeter?Q62.What electrical quantity is measured by a watt-hour meter?Q63.What is the quantity shown on the watt-hour meter in figure 1-46?FREQUENCY METERSAll alternating voltage sources are generated at a set frequency or range of frequencies. A frequencymeter provides a means of measuring this frequency. Two common types of frequency meters are thevibrating-reed frequency meter and the moving-disk frequency meter.Vibrating-Reed Frequency MeterThe vibrating-reed frequency meter is one of the simplest devices for indicating the frequency of anac source. Vibrating-reed frequency meters are usually in-circuit meters. They are used on power panels
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