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  2. Avometer - Wikipedia

    en.wikipedia.org/wiki/Avometer

    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 ]

  3. Multimeter - Wikipedia

    en.wikipedia.org/wiki/Multimeter

    A "Universal" version having additional alternating current and alternating voltage ranges was offered from 1933 and in 1936 the dual-sensitivity Avometer Model 7 offered 500 and 100 Ω/V. [12] Between the mid-1930s until the 1950s, 1,000 Ω/V became a de facto standard of sensitivity for radio work and this figure was often quoted on service ...

  4. Megger Group Limited - Wikipedia

    en.wikipedia.org/wiki/Megger_Group_Limited

    AVOmeter model 8 Mk7. The invention of the first multimeter is attributed to Donald Macadie (1871–1955) [17] [18] who was the manager of the Post Office Telephone Factory in Holloway, North London. He was granted Patent GB 200977 on 26 July 1923.

  5. Electrical conductivity meter - Wikipedia

    en.wikipedia.org/wiki/Electrical_conductivity_meter

    The conductivity of a solution is highly temperature dependent, so it is important either to use a temperature compensated instrument, or to calibrate the instrument at the same temperature as the solution being measured.

  6. Sanwa Electronic - Wikipedia

    en.wikipedia.org/wiki/Sanwa_Electronic

    It merged with Sanwa Denki Manufacturing in 1965 and then became part of the SMC Group. In January 1974, Sanwa entered production and sales of transmitters for radio-controlled models and in December, became a member of the Japan Radio Control Model Industrial Association (JRM). [1] In 1975, Sanwa became a division on its own, with an office in ...

  7. Current clamp - Wikipedia

    en.wikipedia.org/wiki/Current_clamp

    Clamp meter. In electrical and electronic engineering, a current clamp, also known as current probe, is an electrical device with jaws which open to allow clamping around an electrical conductor.

  8. Advantest - Wikipedia

    en.wikipedia.org/wiki/Advantest

    Advantest Corporation (株式会社アドバンテスト) is a Japanese leading manufacturer of automatic test equipment (ATE) for the semiconductor industry, and a manufacturer of measuring instruments used in the design, production and maintenance of electronic systems including fiber optic and wireless communications equipment and digital consumer products.

  9. Galvanometer - Wikipedia

    en.wikipedia.org/wiki/Galvanometer

    An early D'Arsonval galvanometer showing magnet and rotating coil. A galvanometer is an electromechanical measuring instrument for electric current.Early galvanometers were uncalibrated, but improved versions, called ammeters, were calibrated and could measure the flow of current more precisely.

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