The 9155D-501 Linearity option is a software option available 
with the 9155 Accelerometer Calibration Workstation System. 
The software option allows for measurement of linearity across 
a specified amplitude range at a user-defined fixed frequency, 
dependent upon allowable test frequencies for the given shaker. 
The measurements are limited by the actuator hardware (i.e. the 
shaker, amplifier, etc.) and the specifications listed below are 
achievable with the indicated hardware only.