UMIK-1 sensitivity

Wei Lin

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Thread Starter
Joined
Jun 24, 2022
Messages
2
Hi,

I would like to use UMIK-1 to measure SPL with my Python code, but I can not find the sensitivity of UMIK-1, nor in its datasheet of its calibration file.

In its calibration file there is one line saying "Sens Factor =-0.667dB", but it doesn't make sense to me.

I wonder how REW calculates the sensitivity of UMIK-1 from "Sens Factor" ?

Thanks

Wei
 

John Mulcahy

REW Author
Joined
Apr 3, 2017
Messages
5,738
The sens factor figure is the rms input level from the mic in dBFS when driven by a 94 dB calibrator with the mic input volume set to maximum. Note for that purpose the dBFS reading is based on a full scale sine being -3.01 dBFS, not 0 dBFS. The actual OS input volume gain/attenuation needs to be accounted for when converting mic rms dBFS levels to SPL.
 
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