Fast Response Output is a LabChart extension that allows you to control the digital outputs on /30 and /35 series PowerLabs and the analog outputs on /20, /25, /30, and /35 series PowerLab units (other models not supported), for generation of rapid responses from within the PowerLab itself. Because Fast Response Output responds to the input signal as soon as it reaches the PowerLab, the resultant user-defined output is produced in less than 1 millisecond, irrespective of the speed of the computer.