407780 Datasheet, PDF (6/13 Pages) Extech Instruments Corporation. – Integrating Sound Level Datalogger

SEL Mode
In the SEL mode (Sound Exposure Level) – the display indicates the constant sound level in
decibels which, if lasting for one second, would deliver the same amount of acoustical energy
as that delivered over the entire measurement period. If no run time has been accumulated
the display shows dashes.
1. Turn the meter on by pressing the green on/off button.
2. Select the SEL mode by pressing the Leq SEL SPL button until SEL appears on the
LCD.
3. Select the desired Frequency Weighting as needed (A or C).
Change the Frequency Weighting by pressing the 'A/C' button. The 'A' or 'C' icon will
display on the right-hand area of the LCD.
4. Select the desired Response Time as needed (Fast or Slow)
Change the Response Time by pressing the 'FAST/SLOW/IMPULSE' button. The
'FAST' 'SLOW' or IMP icon will display.
5. Select the desired Run Time. There are 13 preset time settings available (To perform a
manual recording select the 24 hour interval)
1 second
5 minutes
30 minutes
3 seconds
8 minutes
1 hour
10 seconds
10 minutes
8 hours
30 seconds
30 minutes
24 hours
1 minute
15 minutes
Change the run time by pressing the INTEG TIME button. The run time will appear in the
middle of the LCD. Press the ▲or▼ button to select the preset time setting.
6. Hold the instrument comfortably in hand and away from your body or position it on a
tripod. Point the microphone toward the noise source
7. Press ► button to begin measuring. The run time counter will zero
and begin counting. While running the meter will display ► at the top
of the display.
SEL
The meter will stop automatically after the preset time interval has
expired and will display ■ and the SEL for the recording interval.
SEL
It is also possible to datalog the session. Simply press RECORD
before pressing ► . The RECORD icon will appear on the bottom
right of the display and flash while the session is in progress. For instructions on
retrieving the recorded data please refer to the software manual on the CD included with
your meter.
6
Model 407780 Version 2.1 09/07