在林业机械、木工机械的设计、制造以及使用过程中,经常要对各种物理量进行测试。而各种数据的采集,则是测试工作的重要一环。一般来说待测的物理量,如拉力、转速、转角、温度等,多数是由各类传感器转变为电信号,而这些来自传感器的电信号又多是比较微弱的电平信号,这样就需要放大器将微弱的信号进行 In the forestry machinery, woodworking machinery design, manufacture and use of the process, often to a variety of physical testing. The collection of various data, it is an important part of the test. Generally speaking, the physical quantity to be measured, such as pulling force, rotation speed, rotation angle, temperature and so on, is mostly converted into electrical signals by various sensors, and these electrical signals from the sensors are mostly more weak level signals, thus requiring an amplifier Weak signal