Level (Noise) – Leq Logging (Full Spectrum)
Step 1 – Logging Levels
This setup is for logging level measurements, as default it is set to log the dBA eq. value each second for 1 microphone. To stop the logging, use Measurement→Cancel.
Connect the microphone to left channel sound card input (if it is a stereo input). The sound card output will not be used.
Click the Next > button to continue.
Step 2 – Calibration
To measure the correct absolute levels, the input chain must be calibrated. If you only need to compare relative levels, you may skip this part.
Calibration can be done in different ways as explained if you click help. Here we assume that you are using a microphone and have a calibrator.
Then what you need to calibrate is to click the Cal button on the standard toolbar as shown in the figure. Follow the procedure to complete the calibration.
Step 3 – Duration/Real Time
The length of the data recorded in each measurement is 1 seconds as default, it can be changed from Measurement→Settings… as shown in the figure.
The setup is in Multi measurement mode as shown in the picture.
This may not work on slower PC's. The dBA value will be updated slower if Single measurement mode is selected, but then there will be a gap after each logging. To do this go to Measurement→Tasks… and make sure Automatic start of new measurement after previous is checked.
Step 4 – About the Plot
As default, a dBA plot is displayed.
The levels are equivalent levels. Fast/slow etc. will be supported in future versions of WinMLS.
To save the data in the plot, go to File→Export Data…. This will save as a text-file that can be opened e.g. in MS Excel.
You may add new plots, for example dBC. Do this from Window→New Window….
Step 5 – Change the dBA-plot
You may select another parameter and set the frequency range. To do this, go to Plot→Plot Type Settings→Level…. The dialog shown in the picture will be displayed.
Click help for more info.
Step 6 – Multi-channel Logging
To log multi-channel data, select the number of channels to measure from Measurement→Settings… as shown in the picture.
You may also add new plots. Do this from Measurement→Plot Type/Routing/Test….Select the plot type named "Parameter".