3 Testing information
3.1 Acoustic test
3.1.1 Microphone alignment for measuring according to IEC 61672-1:2003.
To measure the influence of mechanical vibrations you need a second sound level meter with officially verified
calibration as reference device. The microphone of the reference device has to be positioned in a maximum
distance of 0.2 m from the microphone of the tested device and must not be exposed to the mechanical
vibrations of the exciter.
Figure 3.1: Alignment for vibration test
3.2 Electrical test
For eletrical testing use the equivalent electrical impedance device K65 only (section 5) (manufacturer spec-
ifications: 22 pF ±12% with a parallel resistance of 81 MΩ ±12%).
3.2.1 EMC test
The measurement is performed for the following configurations:
Low interference immunity: USB cable linked to public power supply and microphone extension cable
connected
Maximim interference immunity: USB cable and microphone extension cable disconnected
3.2.2 Level linearity
The starting values for the level linearity tests are listed in the last column of table 4.3.
SINUS Messtechnik GmbH 21 of 30 Manual Tango_Plus
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