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  2. Tachymeter (watch) - Wikipedia

    en.wikipedia.org/wiki/Tachymeter_(watch)

    Tachymeter scale on a Citizen watch bezel. A tachymeter (pronounced / t æ ˈ k ɪ m ə t ər /) is a scale sometimes inscribed around the rim of an analog watch with a chronograph.It can be used to conveniently compute the frequency in inverse-hours of an event of a known second-defined period, such as speed (distance over hours) based on travel time (distance over speed), or measure distance ...

  3. Tachograph - Wikipedia

    en.wikipedia.org/wiki/Tachograph

    The trace closest to the outer edge is the speed trace. The disc is preprinted with a speed scale and the stylus produces a mark corresponding with the speed of the vehicle at any given time. It is important that the maximum speed (Vmax) specification of the chart matches that of the tachograph head for the speed to be correctly recorded.

  4. Tachometer - Wikipedia

    en.wikipedia.org/wiki/Tachometer

    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 ...

  5. Redline - Wikipedia

    en.wikipedia.org/wiki/Redline

    Redline. Tachometer showing red lines above 14,000 rpm. Redline refers to the maximum engine speed at which an internal combustion engine or traction motor and its components are designed to operate without causing damage to the components themselves or other parts of the engine. [1] The redline of an engine depends on various factors such as ...

  6. Digital tachograph - Wikipedia

    en.wikipedia.org/wiki/Digital_tachograph

    Digital tachograph. A digital tachograph in operation, with a driver card inserted. A digital tachograph is a device fitted to a vehicle that digitally records its speed and distance, together with the driver's activity selected from a choice of modes. In Europe, it succeeded the analogue tachograph as a result of European Union regulation 1360 ...

  7. List of measuring instruments - Wikipedia

    en.wikipedia.org/wiki/List_of_measuring_instruments

    Time. Watch, a time measurement device. In the past, a common time measuring instrument was the sundial. Today, the usual measuring instruments for time are clocks and watches. For highly accurate measurement of time an atomic clock is used. Stopwatches are also used to measure time in some sports.

  8. Wheel speed sensor - Wikipedia

    en.wikipedia.org/wiki/Wheel_speed_sensor

    This correction enables a larger maximum permissible air gap at the speed sensor. On a module m = 1 target wheel these new sensors can tolerate an air gap of 1.4 mm, which is wider than that for conventional speed sensors on module m = 2 target wheels. On a module m = 2 target wheel the new speed sensors can tolerate gap of as much as 2.2 mm.

  9. Tach timer - Wikipedia

    en.wikipedia.org/wiki/Tach_Timer

    Tach timer. The tach (ometer) timer is an instrument used in aviation to accumulate the total number of revolutions performed by the engine. The unit of measure is equivalent to the number of hours of running at a certain, specific reference speed of rotation. If the reference speed of rotation is 2400 RPM then the timer runs in real time when ...

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