The LW161.138-13 modal test system makes full use of our smaller MT-161 modal test shakers natural convection cooled performance. The thruster's full .75 inch stroke capability, low suspension spring rate and light-weight armature makes this system ideal for most smaller modal test applications not requiring the MT-161's full force. The thruster body features a through hole, and a single collett or thread load attachment to accommodate both tension wire and stinger modal testing. The PA-138 amplifier is direct coupled to the shaker to give the maximum performance at DC through high frequencies, and can be easily switched from voltage source mode to current source mode for force input testing applications. The voltage-proportional-to-current amplifier signal output facillitates servoed force test operation. Dual bar graphs display the system operating levels and internal and external interlocks help protect the system from accidental abuse.