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فيديو شرح Fire Alarm Class B Circuits Explained ضمن كورس انظمة انذار الحرائق شرح قناة Pyrotex Systems، الفديو رقم 17 مجانى معتمد اونلاين
The information in this video is intended to help industry technicians with the installation, maintenance, and testing of fire alarm systems. In this video we define a Class B circuit, discuss how these circuits work, expalin the roll of diodes in notification appliance circuits (NAC) and how to test all of these functions with a digital multimeter.