Sound card sensitivity calibration

Start by calibrating the sound card, since the transducer calibration is dependent on the sound card sensitivity. Start by calibrating the sound card, since the transducer calibration is dependent on the sound card sensitivity. Click the button to the right of the Sound card conversion [dB] to display the settings.

From this dialog box you can set the frequency and level for the calibration, and choose if you want to use an external meter or use the sound card input to measure the output level. Type the desired signal frequency and level in the dialog box. 1000 Hz should be fine for most purposes. Using the sound card input for measuring the output level is fine if you have calibrated the input.

If you are to use a voltage meter to measure the output level, choose Use external meter to measure level in the list box. Then measure the output level on channel 1 (left) using the voltage meter after clicking the button. Type the measured level in the dialog box below the frequency setting (you are also asked to enter the level during the actual calibration, the level you have typed now will show as default).

If are to use the sound card input to measure the level, select Use soundcard input to measure level. The sound card input will now measure and determine the level automatically, no number to be typed, but you must be sure that the sound card input is calibrated properly and that it is connected to input channel 1 (left). Exit the dialog box by clicking .

Make sure that you have connected the calibration signal to the correct input channel (channel 1 is left).

Now click the button to perform the calibration. After the calibration is performed, the number to the left and the date to the right of the button will be updated with the new settings. Now you can do a measurement to test if the calibration is correct. You can use sinusoid as excitation signal (see How to use a sinusoidal excitation signal?). Please note that if you repeat the calibration, the number may not seem to be changed, but if the date is updated, this is probably because exactly the same number is written.