Extech Instruments 407780 User Manual

Model407780‐ENv2.31/14
5
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.)
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.
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.
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.
1 second 3 seconds 10 seconds 30 seconds 1 minute
5 minutes 8 minutes 10 minutes 30 minutes 15 minutes
30 minutes 1 hour 8 hours 24 hours
Leq
00:00:30
68.7
dB
■
Leq
00:00:00
68.7
dB
►

Extech Instruments 407780 Specifications

General

Brand	Extech Instruments
Model	407780
Category	Data Loggers
Language	English