Device for determining short-circuited turns in coils. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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The device (Fig. 1) is an oscillator based on a semiconductor triode, operating in a regime close to generation failure.
Fig. 1
In the presence of short-circuited turns in the investigated coil Lx, the generation breaks down, and the consumption current drops sharply. An MP-70 milliammeter or a neon lamp is used as an indicator (Fig. 2). In this case, the number of turns L3 is selected depending on the type of neon lamp.
Fig. 2
A ferrite rod F-600 with a diameter of 8 mm and a length of 140 mm serves as a magnetic circuit (the generator coils and the coil under test are put on it). The generator coils contain: L1 - 200 turns, L2 - 60 turns of PEL wire 0,37. They are placed on a two-section frame with a diameter of 10 mm. Bulk winding, winding width of each coil is 3 mm.
Battery device KBS-L-0,5 from a flashlight.
The instrument is configured as follows. A short-circuited coil of wire with a diameter of 0,1 mm is put on a ferrite rod. By changing the resistance R2, the disruption of generation is achieved. When the coil is removed from the magnetic circuit, the generation should be restored.
Authors: A.Belyavskoy, L.Shcherbina, Kasli, Chelyabinsk region.
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