A Servo Loop is a feedback control system where the controlled variable is typically a mechanical position. Control system designers must measure the system transfer function in order to design control systems used for precise control of a mechanical system. Data Physics offers a wide range of tools for measurement of mechanical system transfer functions for control system design.
Perhaps the most important analysis tool for closed loop system testing is Stepped Sine Analysis because most closed loop servo systems cannot be excited by a broadband random source. The Stepped Sine Analysis application in SignalCalc Analyzers provides many features that make it very suitable for this application including coherence limiting, variable resolution, variable source levels, and variable step speed, processing type, and open loop estimation of the transfer function using a three channel technique.