How to set the output signal amplitude to a calibrated value, e.g. 2.83 Volts_RMS?

Normally the sensitivity measurements are done when the voltage over the loudspeaker is 2.83 Volts_RMS.

The output signal can be set to a certain amplitude using several methods, but the easiest way is perhaps to use a voltage meter to measure the voltage over the loudspeaker terminals.

Do this the following way:

Go to Measurement->Settings... and click the Levels tag to display the settings shown below.

If you want to calibrate, click the  button and follow the procedure for output calibration. See the section for more information. When the calibration is finished, the dialog box will look as shown below.

In the upper list box select Signal Generator Only. Make sure the frequency is near 1000 Hz as shown in the figure below.

You should click the Levels tab as shown in the figure above to check that the level for the sinusoid is the same as for the signal you are using for the measurements (in the example figure below we use sine sweep as excitation signal)

Now start the generator from Measurement->Start.

Connect a voltage meter over the loudspeaker terminals and adjust the output level so it is 2.83 Vrms. You can use the Levels tag setting shown in the figure above to set the output level. but then you need to set the same level for the output signal that you are using for the measurement (sine sweep).

To do this, switch back to Impulse/Frequency Response and set the same level as you set in Signal Generator Only.

If your WinMLS can control the mixer level of your sound card, you may also control the level from the WinMLS mixer as shown in the figure below.