Two other sources are arc welders and furnace ignitors. This type of transient occurs when opening and closing contacts to electric motors or fluorescent lighting using magnetic ballasts. A 250V to 3000V transient can occur with the interruption of an inductor's current. DC motor drives, variable speed AC motor drives, DC power supply switching, and portable power tools are other sources of transients.Ī more elusive transient is one caused by the switching of inductive loads. Electric motors, such as those used in elevators, heating, air conditioning, refrigeration or other inductive loads, can create a continuous stream of 250V to 1000V transients. These types of transients are usually caused by the discharge of stored energy in inductive and capacitive components. Transients caused by other electrical equipment are well within the capabilities of a hand-held multimeter. Due to its high energy and sporadic nature, this type of transient is rarely isolated using a handheld multimeter. Power lines running overhead or even underground can have voltage induced in them either by a direct or indirect strike of lightning. Transients are generally divided into two basic categories: natural occurring transients such as lightning and transients caused by other equipment. This application note will explain the types of transient signals the GMM will capture as well as the steps involved in capturing a transient. Once captured, the waveform and meter readings can be analyzed immediately or stored and printed for analysis at a later time. The Fluke 860 Series Graphical MultiMeters (GMMs) are designed specifically to capture and display high speed transients occurring on AC powerlines. Identifying and isolating the source of AC powerline disturbances can be a difficult and painstaking process. Capturing Transient Signals with a Graphical MultiMeter
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