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  2. Tacheometry - Wikipedia

    en.wikipedia.org/wiki/Tacheometry

    A theodolite is used to measure the horizontal angle between indicators on the two ends of the subtense bar. The distance from the telescope to the subtense bar is the height of an isosceles triangle formed with the theodolite at the upper vertex and the subtense bar length at its base, determined by trigonometry.

  3. Theodolite - Wikipedia

    en.wikipedia.org/wiki/Theodolite

    A theodolite (/ θ i ˈ ɒ d ə ˌ l aɪ t /) [1] is a precision optical instrument for measuring angles between designated visible points in the horizontal and vertical planes. The traditional use has been for land surveying , but it is also used extensively for building and infrastructure construction , and some specialized applications such ...

  4. Optical power meter - Wikipedia

    en.wikipedia.org/wiki/Optical_power_meter

    The ability to set the unit to read 0 dB at a reference power level, typically the test source. The ability to store readings into internal memory, for subsequent recall and download to a computer. The ability to synchronize the wavelength with a test source, so that the meter sets to the source wavelength.

  5. Tachometer - Wikipedia

    en.wikipedia.org/wiki/Tachometer

    A tachometer that can indicate up to 7000 RPM (left) A tachometer (revolution-counter, tach, rev-counter, RPM gauge) is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine. [1] The device usually displays the revolutions per minute (RPM) on a calibrated analogue dial, but digital displays are ...

  6. Hall effect sensor - Wikipedia

    en.wikipedia.org/wiki/Hall_effect_sensor

    In such a case the Hall sensor is mounted in a gap in the magnetic core around the current conductor. [24] As a result, the DC magnetic flux can be measured, and the DC in the conductor can be calculated. Hall effect current sensor with internal integrated circuit amplifier. 8 mm opening.

  7. Total station - Wikipedia

    en.wikipedia.org/wiki/Total_station

    A total station or total station theodolite is an electronic/optical instrument used for surveying and building construction. It is an electronic transit theodolite integrated with electronic distance measurement (EDM) to measure both vertical and horizontal angles and the slope distance from the instrument to a particular point, and an on ...

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