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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.
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."
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]
A connection system is used, connecting the part to automatic or manual test equipment. The test equipment then applies power to the part, supplies stimulus signals, then measures and evaluates the resulting outputs from the device. In this way, the tester determines whether the particular device under test meets the device specifications.
Specifications. SCPI-1999, Volume 1-4, 819 page PDF file, free download (doesn't include asterisk (*) commands, because they are specified in IEEE 488.2 & IEC 60488-2) IEEE 488.2-1992, 254 page PDF file, costs USD$52 in 2024 (superseded by IEEE/IEC 60488-2-2004) IEEE/IEC 60488-2-2004, 264 page PDF file, costs USD$373 in 2024
4 Unsourced neon test light hazards. 1 comment. 5 Vintage test light. 1 comment. 6 Field detection - electric or magnetic? 5 comments. Toggle the table of contents.
"Neon" is used to denote the general type of lamp, but neon gas is only one of the types of tube gases principally used in commercial application. Pure neon gas is used to produce only about one-third of the colors (mostly shades of red and orange, and some warmer or more intense shades of pink).