To use sound level module, please first select one or more analog channels in the Analog tab to measure the sound.
Then switch to the Sound levels tab and click the 
button to add a new Sound levels module. Several modules can be used within a session.
A screen like the one shown below will appear. First of all, select the input channels 
that should be measured at the upper left side of the display. In our case, only AI 0 is selected. We can select multiple channels and then have several output channels with the same settings.
We have several options to select from in Calculation type section 
. Any combination of Frequency and Time weighting can be selected. We can also select the weighting specifically for Lpk weighting from linear, A and C.
We have three types of Output time channels 
. First is the LFTp - time and frequency weighted sound pressure level already scaled to dB. Then we have theLLpk value, which shows the current maximum value of the sound levels, the Fweighted raw value shows the frequency weighted time curve of sound in Pascal.
Then we need to select Output calculated channels (parameters) 
. These parameters can be Overall values, which means that we have only one value at the end of the measurement and/or interval logged. If we have an interval logged value, the time interval for logging is defined. For example, if we select to have Interval logging for Leq with 5 seconds intervals, we will get a new value of Leq after each 5 second period. After that, the value is reset and the calculation is restarted.
The values that can be calculated are:
| - | frequency-weighted LFeq value, which is equivalent to sound level |
| - | LFim tells the impulsivity of sound and is the impulse-weighted equivalent; the difference between those two values is calculated as LFim-LFeq |
| - | LLpkmax is either C or a linear weighted maximum peak value of sound |
| - | LFE is the frequency-weighted sound energy |
| - | LFTmax and LFTmin are the time- and frequency-weighted minimum and maximum levels of sound pressure |
| - | the next section of sound is classified sound levels. Each calculated value is put in these classes and then we can choose to see LAF1, 5, 10, 50, 90, 95 and 99 % classes of values. |
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| Sound channel setup |
Now let's see how to calibrate a microphone.
