Frequently Asked Question

At what point can you decide whether the coherence of your tap test is insufficient in order to create good stability lobes. Does it depend from which frequency the signal starts to drop or drops completely? And what to do when there's no way to get a bet
Last Updated 7 years ago

The ideal coherence value is unity (=1) for the frequency range of interest. However, it is always useful to look at the power spectrum of impact force and accelerometer. The impact force spectrum must not be close to zero if there is any mode (peak) in vibration spectrum. CUTPRO MALTF indicates the unreliable measurement range automatically.

If you cannot obtain good coherence and wide bad impact force spectrum, use flexible tool option of MALTF. The alternative is to buy a very light miniature hammer from PCB. However, such hammers are difficult to use.

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