In step. 2, select if you want to do an easy combined
calibration or an advanced individual calibration.
If you select the advanced 
calibration, you first need to
calibrate your before calibrating your
microphone (or another ). The calibration must be used if you
do not have a calibrator but the sensitivity of your microphone is given (e.g.
20 mV/Pa). Use also if you
have an external input amplifier and want to adjust the gain steps of this
amplifier, or if you are using WinMLS to perform both electrical measurements
and measurements using a microphone. If any of the above suggestions are not
relevant for you, we recommend that you use 
.
In the rest of the documentation, we assume has been selected.