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- 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.
- Metering Basics
- Meter Basics Both analog and digital metering methods can measure many useful electrical quantities.
- 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.
- Voltmeters and Ammeters
- Voltmeter Design A perfect voltmeter has infinite resistance, so that it draws no current from the circuit under test.
- Ammeter Design Unlike the ideal voltmeter, the ideal ammeter has zero internal resistance, so as to drop as little voltage as possible as electrons flow through it. Note that this ideal resistance value is exactly opposite as that of a voltmeter.
- AC Voltmeters and Ammeters AC electromechanical meter movements come in two basic arrangements: those based on DC movement designs, and those engineered specifically for AC use.
- Power meters
- Wattmeter Design 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 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.
- Metering Basics
�Getting Started