407780 Datasheet, PDF (5/13 Pages) Extech Instruments Corporation. – Integrating Sound Level Datalogger

Operation
This meter can be used in two different manners. As an Integrating Sound Level Meter
or as a Sound Pressure Meter (SPL).
Integrating Sound Level Meter
LEQ Mode
In the LEQ mode the display indicates the integrated (average) level for the run period. If no
run time has been accumulated the display shows dashes.
Taking Measurements
1. Turn the meter on by pressing the green on/off button.
2. Select the LEQ mode by pressing the Leq SEL SPL button until LEQ 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' icon will display on the upper area of the LCD.
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.
00:00:00
68.7 Leq
dB
The meter will stop automatically after the preset time interval has
expired and will display ■ and the LEQ for the recording interval.
To take another LEQ simply press ► again.
■
00:00:30
68.7 Leq
dB
It is also possible to record each 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.
5
Model 407780 Version 2.1 09/07