光点矢量瓦特表(以下简称瓦特表)是瓦特表式动平衡机的重要部件。它同时具有显示仪表和机电滤波器这两种功能。本文不打算讨论瓦特表作为显示仪表的功能,而想着重讨论瓦特表滤波能力的问题。在普通的瓦特表式动平衡机中,往往不加任何滤波电路,完全依靠瓦特表本身的滤波能 Light spot vector wattmeter (hereinafter referred to as wattmeter) is an important part of the wattmeter dynamic balancing machine. It also has both display instrument and electromechanical filter functions. This article does not intend to discuss the wattmeter as a display instrument function, but rather to focus on the watt-hour filter problem. In the ordinary Watt-Balancing Machine, often without any filter circuit, completely dependent on the watt-meter filter itself