Patent ID: 7913547
Filing Date: 2011-03-29
Classification: G01P

Abstract:
1. An engine rotating meter comprising: a wave receiving section which receives an electromagnetic wave generated by an ignition system of an engine, the wave receiving section configured to be positioned at or near components of the ignition system; an antenna which induces and detects the electromagnetic wave generated by the ignition system and received by the wave receiving section, the antenna being electrically coupled to the wave receiving section; a measurement processing circuit which measures an engine speed based on a pulse formed from the electromagnetic wave detected by the antenna; a level adjusting circuit, coupled to an intermediate point of a circuit between the antenna and the measurement processing circuit, to adjust a level of the pulse; and a manual input mechanism disposed on a main body of the engine rotating meter which enables manual adjustments to the level adjusting circuit to maintain the pulse to a level suitable for performing the measurement processing of the engine speed.