The following optional software packages can be used in any combination: Accumulated Fatigue Damage Factor (AFDF) AFDF calculates the accumulation of fatigue caused by vibration. It is based on Minor's rule. Peak Probability Distribution Function (PPDF) PPDF shows the graph of the probability distribution of the peaks and valleys of an accelerometer signal. This can be used to show the random nature of the table vibration. Transmissibility Displays the non-dimensional ratio of response acceleration to input acceleration in the time and frequency domains (compares response of two accelerometers). Thermotrak II™ ThermoTrak II™ is a networking system that provides access to chamber programming, operating, data acquisition and display functions from a single PC. It allows for multiple Thermotron chamber controllers to be linked and automates and simplifies your testing process. It also allows you to run several test profiles simultaneously. See the Thermotrak page for more information.