Extech Instruments 407790A User Manual page 32

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4.4 Sound Band - Leq, SEL, Lmax, Lmin and LN Analysis Measurement
1. Power on the meter and wait until the SLM measurement screen appears.
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
4. Use the FREQ WEIGHT TIME button to select the time weighting characteristic. For normal
measurements
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.
OV UN
-
+
-
+
Important
During measurement, the
and SLM/RTA functions are disabled. Be sure to complete all settings before starting the
measurement.
12. When the measurement is completed, the
If OV displayed, the processed data includes data where the sound level signal caused an
overload condition.
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symbol flashes
LEVEL button, FREQ WEIGHT TIME button, TIME WEIGHT
symbol disappears.
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