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  2. Ohmmeter - Wikipedia

    en.wikipedia.org/wiki/Ohmmeter

    First, the meter needs to be zeroed by shorting the measurement points together and performing an adjustment for zero ohms indication prior to each measurement. This is because as the battery voltage decreases with age, the series resistance in the meter needs to be reduced to maintain the zero indication at full deflection.

  3. Multimeter - Wikipedia

    en.wikipedia.org/wiki/Multimeter

    The meter comprised a moving coil meter, voltage and precision resistors, and switches and sockets to select the range. The first Avometer had a sensitivity of 60 Ω/V, three direct current ranges (12 mA, 1.2 A, and 12 A), three direct voltage ranges (12, 120, and 600 V or optionally 1,200 V), and a 10,000 Ω resistance range.

  4. Unified Code for Units of Measure - Wikipedia

    en.wikipedia.org/wiki/Unified_Code_for_Units_of...

    Units are represented in UCUM with reference to a set of seven base units. [5] The UCUM base units are the metre for measurement of length, the second for time, the gram for mass, the coulomb for charge, the kelvin for temperature, the candela for luminous intensity, and the radian for plane angle.

  5. Ohm - Wikipedia

    en.wikipedia.org/wiki/Ohm

    Based on the meter and the second 0.9191 Siemens mercury unit: 1860. A column of pure mercury 0.9537 100 cm and 1 mm 2 cross section at 0 °C British Association (B.A.) "ohm" 1863 1.000 Standard coils deposited at Kew Observatory in 1863 [16] Digney, Breguet, Swiss 9.266–10.420 Iron wire 1 km long and 4 mm 2 cross section Matthiessen 13.59

  6. Keysight - Wikipedia

    en.wikipedia.org/wiki/Keysight

    Keysight Technologies, Inc. is an American company that manufactures electronics test and measurement equipment and software. The name is a blend of key and insight. [2] [4] The company was formed as a spin-off of Agilent Technologies, which inherited and rebranded the test and measurement product lines developed and produced from the late 1960s to the turn of the millennium by Hewlett-Packard ...

  7. Hewlett-Packard - Wikipedia

    en.wikipedia.org/wiki/Hewlett-Packard

    As early as 1977, HP began production of the HP856x spectrum analyzers to complement its RF power meters and sensors capable of measuring signals in excess of 20 GHz. HP also produced configurable chassis based sweep generators capable of generating signals to 20 GHz. Other T&M products of the time included lab grade multimeters, microwave ...

  8. Four-terminal sensing - Wikipedia

    en.wikipedia.org/wiki/Four-terminal_sensing

    Four-point measurement of resistance between voltage sense connections 2 and 3. Current is supplied via force connections 1 and 4. In electrical engineering, four-terminal sensing (4T sensing), 4-wire sensing, or 4-point probes method is an electrical impedance measuring technique that uses separate pairs of current-carrying and voltage-sensing electrodes to make more accurate measurements ...

  9. Hewlett-Packard Voyager series - Wikipedia

    en.wikipedia.org/wiki/Hewlett-Packard_Voyager_series

    The 10C was a basic scientific programmable calculator. While a useful general purpose RPN calculator, the HP-11C offered twice as much for only a slight increase in price. Designed to be an introductory calculator, it was still costly compared to the competition, and many looking at an HP would just step up to the better HP-11C.

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