2403-263-00077 Datasheet, PDF (13/20 Pages) Knowles Electronics – SPEAKER-16-4.7-MFD

2403 263 00077
2.7. Measurement setup (Vibra Function)
fr<25Hz
analyzer
B&K 4374
80g
power amplifier
MFD
~
2.8. Measured Parameters (Vibra Function)
2.8.1. acceleration
Device is measured mounted on a mass of 100g in the center of gravity. This mass is mounted
on a suspension with a resulting resonance frequency of less than 25Hz. An acceleration sensor
(B&K 4374) is mounted in the center of gravity for measuring the acceleration. The maximum
acceleration in the defined frequency range is detected by sweeping the input voltage from the
minimum to the maximum frequency.
2.8.2. Vibra Resonance Frequency
The electrical impedance of the device is measured. The first maximum of the impedance (in the
range of 150-162Hz) corresponds with the vibra resonance frequency.
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