转速是发动机的重要参数。要用它来测定有效功率,很多特性参数是以转速的函数来求得的。 从机械式的到电子式的多种型式仪器可用来测转速,下面就其中的几种介绍如下。 1.电子式转速计 电子式转速测量仪器优于机械式的,但是价格较贵些。多数电子转速仪表能以简单方法实现遥测。其中一些仪表用不接触法测量,所以对试验物不产生反作用,同时具有较高的测量精度。下面从很多仪表中介绍其中几种。 Speed ​​is an important parameter of the engine. Use it to determine the effective power, many of the characteristic parameters are obtained as a function of speed. From mechanical to electronic types of instruments can be used to measure speed, the following on several of them are described below. 1. Electronic Tachometer Electronic speed measuring instruments than mechanical, but more expensive. Most electronic speed meters can be telemetered in a simple way. Some of these instruments measure by contactless method, so there is no adverse effect on the test object, at the same time, high measurement accuracy. Here are a few instruments from which to introduce several.