The ET-139 is our most powerful permanent magnet shaker. It is an excellent choice for both general purpose and modal testing applications. The shaker's large armature makes the shaker ideal for general vibration testing of components and subassemblies. Its compact size and long armature stroke accommodate most modal test requirements. The standard trunnion allows operation in any position from vertical to horizontal. A unique, all flexure, armature suspension design provides excellent axial compliance with high lateral stiffness. There are no rolling or sliding components to wear out and/or produce unwanted noise and distortion.