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2.4. Measurement Setup (acoustics)
IEC BAFFLE
Rq,including wiring < 0,3 Ω
freefield
power amplifier
microphone 1/4“
Analyzer
•
Frequency
response
THD
1 cm³
•
•
≈
measurement adapter
2.5. Measured Parameters
2.5.1. Sensitivity
SPL is expressed in dB rel 20µPa, computed according to IEC 268-5
Measurement set up according chapter 2.4 and 2.9.
This test is performed for 100% of products in the production line
2.5.2.
Frequency response
Frequency response is measured according test set up in chapter 2.4 and 2.9 data sheet and
checked against the tolerance window defined in chapter 2.1. This Test is performed for 100% of
products in the production line.
2.5.3.
Total harmonic distortion (THD)
Is measured according IEC 268-5 (2nd to 5th harmonics) and test set up in chapter 2.4 and 2.9
and checked against the tolerance window defined in chapter 2.1. This test is performed for
100% of products in the production line.
2.5.4.
Rub& Buzz
Rub & Buzz will be measured in the Inline-measuring device with a sinusoidal sweep. Rub &
Buzz is defined as the maximum level of no harmonic energy, expressed as signal to non-
harmonic content ratio, in a certain frequency-range. Signal and evaluation criteria are according
to chapter 2.2. This test is performed for 100% of products in the production line.
page 11 of 22
KNOWLES [ KNOWLES ELECTRONICS ]
