DataPhysics   Step Sine (步进正弦模态激励与分析)

SignalCalc stepped sine testing allows measurement of system frequency responses under particularly challenging conditions. Where the system under test exhibits enormous dynamic range, where signal to noise ratios are poor or the system must be measured while operating, where non-linearities complicate the picture, these are the areas where stepped sine becomes the method of choice

SignalCalc步进正弦测试允许测量系统频率响应在特别具有挑战性的条件下应用。当被测系统表现出巨大的动态范围，当信噪比较低或系统必须在运行时进行测量，当非线性使情况变得复杂时，这些是步进正弦成为选择的方法.

In a stepped sine test, the analyzer directs an internal signal generator to create a steady sine wave at one frequency. The system response is measured just at that frequency. The data point is stored, the signal generator is adjusted to a new frequency, and after a pause while the system transient response settles out, the measurement is repeated for the new point. Frequency response functions are built up from hundreds of individual measurements, each at a single point. Each measurements signal to noise ratio is improved by the concentration of all signal and analysis on a single frequency, while noise remains scattered over the full bandwidth of the system.

在步进正弦测试中，分析仪引导内部信号发生器在一个频率上产生一个稳定的正弦波。系统响应就是在这个频率下测量的。将该频率点数据存储起来后，信号发生器将调整到下一个新的频率，在系统暂态响应结束后，对新频率点进行测量。频率响应函数是由数百个单独的频率测量值综合建立起来的，每个测量值代表一个频率点。每次测量的信噪比都是通过将所有信号集中在一个频率上进行分析来提高的，噪声分散在整个系统的带宽上。