The frequency response of the accelerometer needed for testing depends on what frequencies of vibration are required to be measured. An accelerometer should have a high enough natural frequency as to capture all the frequencies required to be measured.

Natural frequency sufficiently high to capture all frequencies signals problems starting to arise, when the vibration content of the acceleration to be measured gets close to the natural frequency of the accelerometer.

Frequencies to be measured approach the natural frequency of the accelerometer

In these instances, distortion of the acceleration by the high gains seen near the natural frequency can give a false picture of the reported acceleration amplitudes at high frequencies.

Acceleration signal is misrepresented by non-unity gain of the higher frequencies

To overcome this problem, one of two things needs to happen:

1. A higher frequency accelerometer needs to be used. A higher natural frequency accelerometer solves the problem of measuring high frequency acceleration.

2. If the higher frequencies are not required to be measured, then using a low-pass filter should filter them out. A low-pass filter removes high frequency components of the measured signal.