how to measure the directivity of microphone by pxi-4461 You need to have a fixed voice source, and rotate a microphone to measure voice level using 4461 at each angle. Then, plot level versus angle for directivity.

[xxjzzit@126.com]

 i want to measure the  directivity of microphone, but how can i do it by pxi-4461 ?  i have a standard microphone, an under test microphone and pxi-4461? can you give me some ideas? thanks

[KateB]

You need to have a fixed voice source, and rotate a microphone to measure voice level using 4461 at each angle. Then, plot level versus angle for directivity.

[xxjzzit@126.com]

ok， follow is my ideas:

1、the fixed source is generated by the port AO0 of 4461 

2、the signal  via power amplifier to transmitting transducer(device under test),

3、the transmitting transducer is placed on a turntable(0-360°)

4、the signal receive by standard microphone, and access into AI1 of 4461

if the above  true, i just need to record the sound level(Sound Level.Vi) in different angle, and polt it by Poalr Plot.vi?

thanks again