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  2. 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.

  3. Avometer - Wikipedia

    en.wikipedia.org/wiki/Avometer

    With the DC switch set to its "AC" position and the AC switch set to "DC", no current can flow through the instrument. However whenever any moving coil instrument is likely to be subjected to heavy shock in transit, it is good practice to damp the movement by short circuiting the moving coil using a heavy gauge wire connected across the terminals.

  4. Ratio meter systems - Wikipedia

    en.wikipedia.org/wiki/Ratio_meter_systems

    A Ratiometer type temperature indicating system consists of a sensing element and a moving-coil indicator, which unlike the conventional type has two coils moving together in a permanent-magnet field of non-uniform strength. The coil arrangements and the methods of obtaining the non-uniform field depends on the manufacturer's design.

  5. Tachometer - Wikipedia

    en.wikipedia.org/wiki/Tachometer

    In older vehicles, the tachometer is driven by the RMS voltage waves from the low tension (LT contact breaker) side of the ignition coil, [4] while on others (and nearly all diesel engines, which have no ignition system) engine speed is determined by the frequency from the alternator tachometer output. This is from a special connection called ...

  6. Voltmeter - Wikipedia

    en.wikipedia.org/wiki/Voltmeter

    A moving coil galvanometer can be used as a voltmeter by inserting a resistor in series with the instrument. The galvanometer has a coil of fine wire suspended in a strong magnetic field. When an electric current is applied, the interaction of the magnetic field of the coil and of the stationary magnet creates a torque, tending to make the coil ...

  7. Mirror galvanometer - Wikipedia

    en.wikipedia.org/wiki/Mirror_galvanometer

    This moving coil galvanometer is mainly used to measure very feeble or low currents of order 10 −9 A. To linearise the magnetic field across the coil throughout the galvanometer's range of movement, the d'Arsonval design of a soft iron cylinder is placed inside the coil without touching it. This gives a consistent radial field, rather than a ...

  8. Australia says remaining 'Bali Nine' members have returned ...

    www.aol.com/news/australia-says-remaining-bali...

    SYDNEY (Reuters) -The remaining five members of the "Bali Nine" Australian drug ring have returned from Indonesia after diplomatic efforts between the countries this month to strike a repatriation ...

  9. Geophone - Wikipedia

    en.wikipedia.org/wiki/Geophone

    Geophone (SM-24), frequency band 10 Hz to 240 Hz, standard resistance 375 Ω. A geophone is a device that converts ground movement (velocity) into voltage, which may be recorded at a recording station.