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A General Electric NE-34 glow lamp, manufactured circa 1930. Neon was discovered in 1898 by William Ramsay and Morris Travers.The characteristic, brilliant red color that is emitted by gaseous neon when excited electrically was noted immediately; Travers later wrote, "the blaze of crimson light from the tube told its own story and was a sight to dwell upon and never forget."
A test light, test lamp, voltage tester, or mains tester is a piece of electronic test equipment used to determine the presence of electricity in a piece of equipment under test. A test light is simpler and less costly than a measuring instrument such as a multimeter , and often suffices for checking for the presence of voltage on a conductor.
The neon tubes. Electrical components such as cords and transformers. The work's support structure. Other media included in the work. Neon tubes may partially burn out, and a conservator may identify the burned out portion of a neon artwork through use of a neon light tester, also known as a test light or voltage tester. This electronic test ...
The term can also refer to the miniature neon glow lamp, developed in 1917, about seven years after neon tube lighting. [1] While neon tube lights are typically meters long, the neon lamps can be less than one centimeter in length and glow much more dimly than the tube lights. They are still in use as small indicator lights.
the amount of current that should be considered "100%" has to be known and documented for each tube type (and will be different for different emission test circuit details) The advantage of an emission tester is that from all types of tube testers, it provides the most reliable warning of tube wear-out. If emission is at 70%, transconductance ...
Neon lamps are used both to produce light as indicators and for special-purpose illumination, and also as circuit elements displaying negative resistance. Addition of a trigger electrode to a device allowed the glow discharge to be initiated by an external control circuit; Bell Laboratories developed a "trigger tube" cold-cathode device in 1936.
Pearson-Anson oscillator circuit. The Pearson–Anson effect, discovered in 1922 by Stephen Oswald Pearson [1] and Horatio Saint George Anson, [2] [3] is the phenomenon of an oscillating electric voltage produced by a neon bulb connected across a capacitor, when a direct current is applied through a resistor. [4]
Subminiature tubes: Various models such as the 991 [4] that resembled neon lamps, but were optimized for more-accurate voltage regulation; Miniature corona tubes, 5–55 μA current: CK1022 1 kV [5] Wire-ended, subminiature corona tubes: CK1037 (6437) 700 volts, 5–125 μA [6] CK1038 900 volts, 5–55 μA [7] CK1039 (6438) 1.2 kV, 5–125 μA [8]
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