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  2. Megger Group Limited - Wikipedia

    en.wikipedia.org/wiki/Megger_Group_Limited

    Multistation watt-hour meter test board 1942 Resistive load box 1950 Cable fault locator 1951 Protective relay test set 1953 Partial discharge (Corona) detection system 1968 Portable digital multimeter 1979 Digital line earth loop impedance tester 1985 Microprocessor-based high current test set 1989 Battery impedance test equipment (BITE) 1990

  3. Battery tester - Wikipedia

    en.wikipedia.org/wiki/Battery_tester

    Battery tester. A battery tester is an electronic device intended for testing the state of an electric battery, going from a simple device for testing the charge actually present in the cells and/or its voltage output, to a more comprehensive testing of the battery's condition, namely its capacity for accumulating charge and any possible flaws affecting the battery's performance and security.

  4. Avometer - Wikipedia

    en.wikipedia.org/wiki/Avometer

    Avometer 15 Volt BLR121 battery AVOmeter is a British trademark for a line of multimeters and electrical measuring instruments; the brand is now owned by the Megger Group Limited . The first Avometer was made by the Automatic Coil Winder and Electrical Equipment Co. in 1923, and measured direct voltage, direct current and resistance. [ 1 ]

  5. Fluke Corporation - Wikipedia

    en.wikipedia.org/wiki/Fluke_Corporation

    Pomona Electronics is a company specializing in electronic test equipment and accessories. It was founded in 1951 by Joseph J. and Carl W. Musarra, who were brothers. [7] [8] Founded to manufacture test cable harnesses for examining television cathode-ray tubes. [9] the company started in a factory location around the size of a living room. [9]

  6. Multimeter - Wikipedia

    en.wikipedia.org/wiki/Multimeter

    Multimeter test leads. A multimeter can use many different test probes to connect to the circuit or device under test. Crocodile clips, retractable hook clips, and pointed probes are the three most common types. Tweezer probes are used for closely spaced test points, as for instance surface-mount devices. The connectors are attached to flexible ...

  7. Electrical ballast - Wikipedia

    en.wikipedia.org/wiki/Electrical_ballast

    [1] [3] To prevent this, fluorescent tubes are connected to the power line through a ballast. The ballast adds positive impedance (AC resistance) to the circuit to counteract the negative resistance of the tube, limiting the current. [1] Several American magnetic ballasts for fluorescent lamps. The top is a rapid start series autoregulator ...