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  2. Measurement microphone calibration - Wikipedia

    en.wikipedia.org/wiki/Measurement_microphone...

    A pistonphone is an acoustical calibrator (sound source) that uses a closed coupling volume to generate a precise sound pressure for the calibration of measurement microphones. The principle relies on a piston mechanically driven to move at a specified cyclic rate, pushing on a fixed volume of air to which the microphone under test is coupled.

  3. craigslist - Wikipedia

    en.wikipedia.org/wiki/Craigslist

    The website expanded into nine more U.S. cities in 2000, four in 2001 and 2002, and 14 in 2003. On August 1, 2004, Craigslist began charging $25 to post job openings on the New York and Los Angeles pages. On the same day, a new section called "Gigs" was added, where low-cost and unpaid jobs can be posted for free.

  4. Deadweight tester - Wikipedia

    en.wikipedia.org/wiki/Deadweight_tester

    A dead weight tester (DWT) is a calibration standard method that uses a piston cylinder on which a load is placed to make an equilibrium with an applied pressure underneath the piston. Deadweight testers are secondary standards which means that the pressure measured by a deadweight tester is defined through other quantities: length, mass and ...

  5. Pressure measurement - Wikipedia

    en.wikipedia.org/wiki/Pressure_measurement

    Pressure is an expression of the force required to stop a fluid from expanding, and is usually stated in terms of force per unit area. A pressure sensor usually acts as a transducer; it generates a signal as a function of the pressure imposed. Pressure sensors can vary drastically in technology, design, performance, application suitability and ...

  6. Ruby pressure scale - Wikipedia

    en.wikipedia.org/wiki/Ruby_Pressure_Scale

    Ruby spectra R1, R2 lines. The ruby fluorescence pressure scale is an optical method to measure pressure within a sample chamber of a diamond anvil cell apparatus. [1] Since it is an optical method, which fully make use of the transparency of diamond anvils and only requires an access to a small scale laser generator, it has become the most prevalent pressure gauge method in high pressure ...

  7. Calibration - Wikipedia

    en.wikipedia.org/wiki/Calibration

    Automatic calibration - A U.S. serviceman using a 3666C auto pressure calibrator. An automatic pressure calibrator [13] is a device that combines an electronic control unit, a pressure intensifier used to compress a gas such as Nitrogen, a pressure transducer used to detect desired levels in a hydraulic accumulator, and accessories such as ...

  8. Calibration curve - Wikipedia

    en.wikipedia.org/wiki/Calibration_curve

    A calibration curve plot showing limit of detection (LOD), limit of quantification (LOQ), dynamic range, and limit of linearity (LOL).. In analytical chemistry, a calibration curve, also known as a standard curve, is a general method for determining the concentration of a substance in an unknown sample by comparing the unknown to a set of standard samples of known concentration. [1]

  9. Volvo S60 - Wikipedia

    en.wikipedia.org/wiki/Volvo_S60

    The 2.4-litre D5 plug-in hybrid version, fitted with a five-cylinder diesel engine and a 50 kW electric motor, was scheduled for sale in Europe by November 2012. [26] The Volvo S60 and V60 come with Volvo's City Safety system as standard, which is the same system fitted to its sister the XC60. This system stops the car in the event of impending ...

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