• ETT Level 2.13: Metering

    Learn how to understand and check for correct connections of volt, ampere, watt and watt-hour meters.

    1. Basic Devices - Have the ability to check correct connections of volt, ampere, watt and watt-hour meters and meter switches. Check current and voltage circuits and connections.
      • Meter Basics Both analog and digital metering methods can measure many useful electrical quantities.
      • Voltmeters and Ammeters: AC Metering Circuits AC electromechanical meter movements come in two basic arrangements: those based on DC movement designs, and those engineered specifically for AC use.
      • Wattmeter Design: DC Metering Circuits Power in an electric circuit is the product (multiplication) of voltage and current, so any meter designed to measure power must account for both of these variables.
      • Power Measurement: AC Metering Circuits Power measurement in AC circuits can be quite a bit more complex than with DC circuits for the simple reason that phase shift complicates the matter beyond multiplying voltage by current figures obtained with meters.
      • Errors in Measurement Measuring instruments are not exact! Accuracy depends on the instrument you are measuring with.
      • Percentages and Errors "Error" in measurement doesn't usually mean "mistake." It means the difference between the value found by measurement and the "true value" of the quantity.

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