Abstract: The power supply of equipment being tested for common mode noise problems is connected to a source of power with the power and neutral input terminals of the power supply isolated from the power ground. Recorded common mode noise signals are then inserted between the power supply's neutral input terminal and power ground to produce problem conditions. When the cause of the problem conditions are identified, steps are taken to eliminate the condition.

Abstract: A golf training system for detecting unwanted golfer's head displacement during a golf swing includesa support assembly having a vertically adjustable assembly;a first motion detecting device being operable for detecting golfer's head displacement and for generating a signal indicative of such displacement, said first detecting device being an electromagnetic motion detecting means;a second motion detecting device being operable for detecting a golf club head travelling in a preselected zone which zone is inclusive of where a golf ball would be during a swing and for generating a signal indicative of a golf club travelling in said zone and impacting a ball; anda display unit responsive to said signals of said first and second motion detecting devices for indicating unwanted golfer's head displacement prior to a golf club head travelling in said zone and for indicating when a golf club head travels in said zone prior to golfer's head displacement for indicating unwanted golfer's head displacement.