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  2. Calibration - Wikipedia

    en.wikipedia.org/wiki/Calibration

    This is called a limited calibration. But if the final measurement requires 10% accuracy, then the 3% gauge never can be better than 3.3:1. Then perhaps adjusting the calibration tolerance for the gauge would be a better solution. If the calibration is performed at 100 units, the 1% standard would actually be anywhere between 99 and 101 units.

  3. List of communications units and formations of the Royal Air ...

    en.wikipedia.org/wiki/List_of_communications...

    2 Radio Maintenance Unit Calibration Flight: 1 July 1940: Dyce: Hornet Moth Blenheim: N/A: 16 October 1940: 2 Radio Servicing Section Calibration Flight [6] 3 Radio Maintenance Unit Calibration Flight: 1 July 1940: Usworth: Hornet Moth Blenheim: N/A: 16 October 1940: 3 Radio Servicing Section Calibration Flight [6] 4 Radio Maintenance Unit ...

  4. Hounsfield scale - Wikipedia

    en.wikipedia.org/wiki/Hounsfield_scale

    The Hounsfield unit (HU) scale is a linear transformation of the original linear attenuation coefficient measurement into one in which the radiodensity of distilled water at standard pressure and temperature is defined as 0 Hounsfield units (HU), while the radiodensity of air at STP is defined as −1000 HU.

  5. Evans balance - Wikipedia

    en.wikipedia.org/wiki/Evans_balance

    Calibration involves taking three readings: one with an empty tube R 0, one with a tube filled with the calibration reference material, and one with the tube filled with the sample R s. Some balances feature an auto-tare function that eliminates the need for the R 0 measurement. [11] The first two readings provide a calibration constant (C).

  6. Standard (metrology) - Wikipedia

    en.wikipedia.org/wiki/Standard_(metrology)

    In metrology (the science of measurement), a standard (or etalon) is an object, system, or experiment that bears a defined relationship to a unit of measurement of a physical quantity. [1] Standards are the fundamental reference for a system of weights and measures , against which all other measuring devices are compared.

  7. Roentgen (unit) - Wikipedia

    en.wikipedia.org/wiki/Roentgen_(unit)

    In 1975 the unit gray was named as the SI unit of absorbed dose. One gray is equal to 1 J/kg (i.e. 100 rad). Additionally, a new quantity, kerma, was defined for air ionisation as the exposure for instrument calibration, and from this the absorbed dose can be calculated using

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