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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."
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]
The simplest tester is the filament continuity tester, usually with a neon lamp connected in series with the filament/heater and a current limiting resistance fed directly by the mains. There is therefore no need to select the appropriate filament voltage for the particular tube under test, but this equipment will not identify tubes that may be ...
Gas filled tubes and neon lamps have also been used as voltage references, primarily in tube-based equipment, as the voltage needed to sustain the gas discharge is comparatively constant. For example, the popular RCA 991 [2] "Voltage regulator tube" is an NE-16 neon lamp which fires at 87 volts and then holds 48–67 volts across the discharge ...
If two devices share the same type designation other than the first letter (e.g. ECL82, PCL82, UCL82) they will usually be identical except for heater specifications; however there are exceptions, particularly with output types (for example, both the PL84 and UL84 differ significantly from the EL84 in certain major characteristics, although ...
This is a list of European Mullard–Philips vacuum tubes and their American equivalents. Most post-war European thermionic valve (vacuum tube) manufacturers have used the Mullard–Philips tube designation naming scheme.
Soken tester Testing head on the sample of electrical steel. Soken tester - is a portable single yoke instrument for assessing the power loss in electrical steel laminations.. It has been developed for quick assessment of power loss in electrical steel sheet without the need for cutting and annealing, as it is the case for standardised methods like Epstein frame.