Vishay has unveiled a video that presents a demonstration of the high energy pulse capabilities of two resistor technologies: thin film and bulk metal foil.
The video demonstrates how an 80x rated power electrical pulse vaporises the thin film device but is easily absorbed by the foil resistor.
Using a destructive test that determines how a resistor will perform in a worst-case scenario - such as a lightning strike to aircraft or a power surge - the demo video highlights the inherent robust design and survivability of VPG bulk metal foil resistors.
The test circuit used in the demonstration consists of a high-voltage power supply, a knife switch, two small DMMs, a large 3000 V capacitor and 10 kΩ 1206-size resistors in both thin film and the bulk metal foil. The capacitor is charged to 450 V and then discharged through the resistors, subjecting the resistors to a 20 W pulse for 150 ms, or about 80x their rated power.
As a result of the high energy pulse, the thin film resistor is instantly vaporised. The metal foil resistor, however, not only survives, but shows an insignificant change in resistance.
The video is available on the Vishay foil resistors website at www.vishaypg.com/foil-resistors/videos.
Phone: 02 9550 6600
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