vImpact - Automatic Modal Hammer

Modal Hammer tests identify the vibration of a structure by measuring the force acting upon it and the response. When using manual modal hammers, a common and hard to solve problem known as "Double Hits" occurs. In order to overcome this issue, MAUL-THEET developed the automatic modal hammer vImpact. This system excites a structure to an exact force and measures the structure's response to this force, this data can then be analysed with the specialist software provided with this equipment. The precision that MAUL-THEET products achieve ensures that results are reproducible, and their save compatibility facilitates test comparison and re-analysis. The series of automatic modal hammers from MAUL-THEET includes the vImpact-21, vImpact-61 and vImpact-2001,  offering a range of force and frequency capabilities.

MAUL-THEET are constantly innovating, having improved upon the predecessors to these models, vImpact-60, vImpact-20 and vImpact-2000. These improvements include increased maximum power of impact, especially during overhead excitation, as well as a more user-friendly system and interface. The introduction of a grounding switch to the signal cable improves the signal-to-noise ratio, making results even more reliable.

The vImpact-21.i & vImpact-61.i offer the same specifications as the vImpact-21 and vImpact-61, but do not have an adjustable hammer force.

The vImpact system is divided into two components:

  • Hammer Head 
  • Controller
The hammer head is the small Modal hammer with an integrated force cell and the electro-dynamic actor that moves the hammer. This is operated by the control unit which sends an impulse to the actor inside the hammer head. The measured force signal is displayed at the output of the control unit.

The hammer can be triggered by several methods: 

  • Manually, through control unit
  • Closing external input, e.g. push button extension or third-party device.
  • TTL pulse at external input.
  • Built-in timer, in the range of 4 beats per second up to 1 beat per 1000s (16 minutes)


Max impact force: 150N peak
Frequency range: 20kHz
Power supply: 24V


Max impact force: 150N peak
Frequency range: 40kHz
Power supply: 24V


Max impact force: 2000N peak
Frequency range: 6kHz
Power supply: 36V


See demonstrations by Maul-Theet of the vImpact-61 and vImpact-2001.