Extech Instruments 407790A User Manual page 30

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4.3 Sound Level and Octave Band Analysis Measurement
1. With the power ON wait until the SLM measurement screen appears on the display.
2. Use the button to select the desired 1/1 OCT, 1/3 OCT or 1/1 & 1/3 OCT band or
SLM measurement screen.
3. Use the FREQ WEIGHT TIME button to select the frequency weighting characteristic. For normal
4. Use the FREQ WEIGHT TIME button to select the time weighting characteristic. For normal sound
5. Use the LEVEL buttons to set the level range.
Select a setting in which the main channel all-pass value indicator is in the middle of the range.
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6. The level indicator displays the currently measured Sound band level.
Use the button to toggle the measurement screen between graph and numeric display.
If the graph display is selected, use the
frequency band.
In the 1/1 & 1/3 OCT numeric display, frequencies that are currently not displayed can be called up
with the and buttons.
To stop or resume updating the band level indication press the
pause is selected, a pause symbol ( ) appears on the display.
Important: During sound band measurement, do not press the
symbols will be displayed.
The sound band level is being displayed when there is no character string after the basic
indicator.
LAF: Sound band level is being displayed.
LAeq: Sound band level is not being displayed.
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and buttons to move the cursor to the desired
key or other parameter
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