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  2. Tachograph - Wikipedia

    en.wikipedia.org/wiki/Tachograph

    The chart features a pear-shaped aperture in the centre, ensuring it is perfectly aligned upon insertion into the tachograph head. There is no facility to prevent it being inserted back to front, where the styli would be prevented from making contact with the wax surface.

  3. Tachometer - Wikipedia

    en.wikipedia.org/wiki/Tachometer

    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 increasingly common.

  4. Tach timer - Wikipedia

    en.wikipedia.org/wiki/Tach_Timer

    The tach timer is usually used to schedule engine maintenance, although it is just an approximation of "Time in service" which is used to time and schedule aircraft maintenance. Time in service is defined in 14 CFR 1.1 [ 2 ] as the actual time in the air, whereas tach time measures engine revolutions, which would still count time on the ground ...

  5. Timing light - Wikipedia

    en.wikipedia.org/wiki/Timing_light

    Timing light, combination instrument with RPM, volt meter and dwell angle meter. The actual light is on the far end. The black clamp connects to the battery -, the red clamp to +, the green one to the breaker side of the coil (for RPM), the big black clamp in the foreground is an inductive pick-up that clamps around a spark plug wire.

  6. Air core gauge - Wikipedia

    en.wikipedia.org/wiki/Air_core_gauge

    An auto tachometer has a sweep of about 240-250 degrees and typically uses an air core gauge. An air core gauge is a specific type of rotary actuator in an analog display gauge that allows an indicator to rotate a full 360 degrees. It is used in gauges and displays, most commonly automotive instrument clusters.

  7. List of track gauges - Wikipedia

    en.wikipedia.org/wiki/List_of_track_gauges

    Faxe Jernbane in southern Zealand, 791 mm 2 ft 7 + 5 ⁄ 32 in and 785 mm 2 ft 6 + 29 ⁄ 32 in, 2½ feet (785 mm) both gauges were used at Faxe Jernbane and Faxe limestone quarry, none remains, only a few materials and trains from Faxe Jernbane and Faxe limestone quarry remains for preservation on Hedeland veteran railway dk.

  8. Ignition timing - Wikipedia

    en.wikipedia.org/wiki/Ignition_timing

    Pressure in cylinder pattern in dependence on ignition timing: (a) - misfire, (b) too soon, (c) optimal, (d) too late. In a spark ignition internal combustion engine, ignition timing is the timing, relative to the current piston position and crankshaft angle, of the release of a spark in the combustion chamber near the end of the compression stroke.

  9. Multimeter - Wikipedia

    en.wikipedia.org/wiki/Multimeter

    For example, if the meter is set to a range of 300 V full scale, the meter's impedance will be 6 MΩ. 20,000 Ω/V is the best (highest) sensitivity available for typical analog multimeters that lack internal amplifiers. For meters that do have internal amplifiers (VTVMs, FETVMs, etc.), the input impedance is fixed by the amplifier circuit.