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WorksheetsDay 1 AP-GRAS Seminar
Total questions: 20
Worksheet time: 10mins
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
Why do we need preamplifiers?
We need them to amplify the signal to higher voltages that can be detected by the DAQ/Analyzer´s input
They are not absolutely necessary if we don´t want to increase the signal gain
The preamplifier converts the microphone capsule´s high impedance output into a low impedance output that can be fed into a cable and drive the input of the DAQ/Analyzer
What controls the Microphone Capsule´s Low Frequency Cut-off?
It is controlled by a filter in the preamplifier
It is controlled by the size of the venting hole of the capsule, the smaller the venting, the lower the freq cut-off
It is controlled by the capacitance of the microphone, a higher capacitance will results in a lower freq cut-off
What is controlling the electrical Low Frequency Cut-off of a Microphone Set?
It is controlled by the electrical design of the preamplifier
It is controlled by the microphone and the size of its venting hole
It is controlled by the capacitance of the microphone capsule and the input impedance of the preamplifier
Which preamplifier technology will you choose if you have a Pre-polarized microphone capsule?
Traditional LEMO preamplifier
CCP/ICP/IEPE Preamplifier
Both technologies mentioned above will work
Which preamplifier technology will you choose if you have an Externally Polarized Microphone Capsule?
CCP/ICP/IEPE preamplifier
Traditional LEMO preamplifier
Both technologies mentioned above will work
What is the purpose of the TEDS technology?
It stores valuable data from the sensor such as sensor type, sensitivity, calibration date, among others.
It´s a technology that allows for on-site acoustical calibration of the microphone
It´s a technology used to improve the frequency response of the sensor
What is the highest performing AP´s audio analyzer?
APx517
APx555
APx511
APx515
What is the model number of the Transducer Test Interface
APx511
IMP-1
APx1701
AUX-0100
Which of the Measurements below can be performed "Open Loop"
Stepped Frequency Sweep
Loudspeaker Production Test
Transfer Function
Acoustic Response
What is the name of the Utility used to combine Near Field and Far Field data
MERGE
SPLIT
SPLICE
COMBINE
