CF-5200 Frequently Asked Questions

Question number FAQ-0337

In the impact test, the transfer function is being measured using an impulse hammer. Below 1.5 kHz, the coherence (COH) is high and data is being collected well, but at higher frequencies, the data becomes unsatisfactory.

I think the impact waveform of the impulse hammer does not have high frequency components.
The spectrum of the impulse hammer waveform can provide valid measurements in the flat frequency range.
To measure up to a wide range, a metal head should be used.
If the excitation force is insufficient, it is necessary to conduct tests with an exciter.

Chapter of the relevant instruction manual

4.3.7 Coherence Function

Last updated date: 2006-01-16