Day 1 AP-GRAS Seminar

What is the design principle a Measurement Microphone is based on?

• Carbon Microphone Principle

• Dynamic Microphone Principle

• Ribbon Microphone Principle

• Condenser Microphone Principle

What is the output of a Measurement Microphone?

• It´s a current output proportional to the pressure fluctuation obtained by the diaphragm 

• It´s a voltage output proportional to the pressure fluctuation obtained by the diaphragm 

• It´s a charge output proportional to the pressure fluctuation obtained by the diaphragm 

What is the maximum output voltage swing of CCP Microphone Sets?

• 28 V peak - peak

• 8 V peak

• 13 V peak - peak

What is the microphone polarization voltage required from the DAQ/Analyzer to drive a pre-polarized microphone set?

• +200 VDC

• +100 VDC

• 0 VDC

• +200 VAC

The larger the diaphragm of the microphone is...

• The lower the sensitivity and the higher the frequency range

• The higher the sensitivity and lower frequency range

• The size of a microphone´s diaphragm has nothing to do with the sensitivity and frequency range

What is a WS3F measurement microphone?

• It´s a 3" working standard measurement microphone according to IEC 61094

• It´s a 1/2" working standard free-field microphone according to IEC 61094

• It´s a 1/4" working standard free-field microphone according to IEC 61094

. What will happen with the frequency response if you have a lot of dirt and dust on the diaphragm?

• The upper cut-off frequency will increase

• The upper cut-off frequency will decrease

• Nothing will happen, as the mass of the diaphragm is 100 times higher than the mass of the dirt and dust

Where will you normally use a Free-Field microphone?

• When measuring in couplers, closed and small cavities

• When measuring in places with many sound sources and rooms with a lot of reverberation

• When measuring in anechoic chambers or typical applications requiring a sound level meter such as occupational noise

Where will you normally use a Pressure microphone?

• When measuring in couplers, closed and small cavities and/or close to a boundary

• When measuring inside an anechoic chamber

• When measuring inside a reverberant chamber

What is the consequence of blocking the venting hole of a measurement microphone?

• There are no consequences

• The microphone´s preamplifier will overheat due to lack of ventilation

• The microphone won´t be able to equalize the static pressure inside the mic capsule with the static pressure in the environment and the measured results will be erroneous