Method and apparatus for warning of disconnection of an appliance from a power source

摘要: In the method of invention, a signal is injected into power cord an appliance and reference voltage set in response corresponding to impedance at point injection. The present with connected source. continuously compared against An alarm sounds if changes exceed voltage, indicating higher because has been disconnected. one embodiment, apparatus includes bridge having adjustable arm for producing sensing voltage. second injects current predetermined time provide then third embodiment designed mounting within chassis appliance. source produce comparison