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  2. Potentiometer - Wikipedia

    en.wikipedia.org/wiki/Potentiometer

    A string potentiometer is a multi-turn potentiometer operated by an attached reel of wire turning against a spring, allowing it to convert linear position to a variable resistance. User-accessible rotary potentiometers can be fitted with a switch which operates usually at the anti-clockwise extreme of rotation.

  3. Dimmer - Wikipedia

    en.wikipedia.org/wiki/Dimmer

    A common dual dimmer module used in stage lighting A dimmer. A dimmer is a device connected to a light fixture and used to lower the brightness of the light.By changing the voltage waveform applied to the lamp, it is possible to lower the intensity of the light output.

  4. Goniophotometer - Wikipedia

    en.wikipedia.org/wiki/Goniophotometer

    A Goniophotometer is a device used for measurement of the light emitted from an object at different angles. [1] The use of goniophotometers has been increasing in recent years with the introduction of LED -light sources, which are mostly directed light sources, where the spatial distribution of light is not homogeneous. [ 2 ]

  5. Potentiometer (measuring instrument) - Wikipedia

    en.wikipedia.org/wiki/Potentiometer_(measuring...

    A potentiometer being calibrated and then measuring an unknown voltage. R 1 is the resistance of the entire resistance wire. The arrow head represents the moving wiper.. In this circuit, the ends of a uniform resistance wire R 1 are connected to a regulated DC supply V S for use as a voltage divider.

  6. Rotary encoder - Wikipedia

    en.wikipedia.org/wiki/Rotary_encoder

    Rotary encoder for angle-measuring devices marked in 3-bit binary-reflected Gray code (BRGC). The inner ring corresponds to Contact 1 in the table. Black sectors are "on". Zero degrees is on the right-hand side, with angle increasing counter-clockwise. To avoid the above problem, Gray coding is used. This is a system of binary counting in which ...

  7. Autocollimator - Wikipedia

    en.wikipedia.org/wiki/Autocollimator

    An autocollimator is an optical instrument for non-contact measurement of angles. They are typically used to align components and measure deflections in optical or mechanical systems. An autocollimator works by projecting an image onto a target mirror and measuring the deflection of the returned image against a scale, either visually or by ...