2.11. Measurement setup
Rq, including wiring < 0,3Ω
freefield microphone
1/4“
power amplifier
analyzer
•
•
frequency
response
THD
1cm³
measurement adapter
2.12. Measured Parameters
2.12.1. Sensitivity
SPL is expressed in dB rel 20µPa, computed according to IEC 268-5.
Measurement set up and parameters according chapter 2.11.
This test is performed for 100% of products in the production line.
2.12.2. Frequency response
Frequency response is measured according test set up in chapter 2.11 data sheet and checked against
the tolerance window defined in chapter 2.8. This Test is performed for 100% of products in the
production line.
2.12.3. Total harmonic distortion (THD)
Is measured according IEC 268-5 (2nd to 5th harmonics) and test set up in chapter 2.11. This test is
performed for 100% of products in the production line.
2.12.4. Rub& Buzz
Rub & Buzz will be measured in the Inline-measuring device with a sinusoidal sweep. Rub and Buzz is
defined as the maximum peak sound pressure in transmission range of the 5kHz high pass filter.
Signal and evaluation criteria are according to chapter 2.9. This test is performed for 100% of products
in the production line.
©2011 Knowles Electronics
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