Each PCB® Modally Tuned®, ICP® instrumented impact hammer features a rugged, force sensor that is integrated into the hammer’s striking surface.

“Modal Tuning” is a feature that ensures the structural characteristics of the hammer do not affect measurement results. This is accomplished by eliminating hammer resonances in the frequency range of interest from corrupting the test data, resulting in more accurate and consistent measurements.

The force sensor serves to provide a measurement of the amplitude and frequency content of the energy stimulus that is imparted to a test object. Accelerometers are used in conjunction with the hammer to provide a measurement of the object’s structural response due to the hammer blow. A variety of tips supplied with each hammer permit the energy content of the force impulse to be tailored to suit the requirements of the item under test.

Using multi-channel data acquisition and analysis software, the test engineer is able to ascertain a variety of mechanical properties leading to an understanding of an object’s structural behavioral characteristics. Items analyzed can include resonance detection, mode shapes, transfer characteristics, and structural health – such as crack and fatigue detection.

Modal Impact Hammers

ModelSensitivity (mV/bf +/- 15%)Measurement Range (+/- lbf pk)Effective Mass (lb)Length (in)Typical Applications
086E80100500.174.2disk drives, printed circuit boards, small blades
086C01501000.238.5lightly damped panels and frames
086C02501000.348.5machine tool parts, small engines
086C03105000.348.5car frames, engines
086C04510000.348.5car frames, engines
086D05150000.79.0light trucks, pumps, turbines
086D20150002.414.5tool / turbine foundations
086D501500012.135heavy foundations, ships, buildings