Model
407780
‐
EN
v2.3
1/14
7
Sound Pressure Measurements (SPL)
In SPL mode the display shows readings of the sound pressure level.
1.
Turn the meter on by pressing the
green on/off
button.
2.
Select the SPL mode by pressing the
Leq SEL SPL
button until SPL 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.
Note:
With ‘A’ weighting selected, the meter responds like the human ear. ‘A’ weighting is
commonly used for environmental measurements, OSHA regulatory testing, law enforcement,
and workplace design. Select ‘C’ weighting for flat response measurements. ‘C’ weighting is
typically used for the sound level analysis of machines, engines, etc. Most hearing
conservation related testing is performed using 'A' Weighting.
4.
Select the desired Response Time as needed (Fast, Slow or Impulse).
Change the Response Time by pressing the 'FAST/SLOW/IMPULSE' button. The 'FAST' 'SLOW'
or IMP icon will display.
Note:
Select FAST to capture noises that occur very quickly. In FAST mode, the meter
responds in 125ms. Select the SLOW Mode (meter responds in 1s) to monitor a sound
source that has a reasonably consistent noise level or to average quickly changing levels.
In
IMPULSE mode the meter responds in 35ms and is used to capture the rms value of
repetitive impulse noises
.
Selection of Fast or Slow is determined by the application and any
directives or standards related to that application. Most hearing conservation related testing is
performed using a SLOW Response Time setting.
5.
Hold the instrument comfortably in hand and away from your body or position it on a tripod. Point
the microphone toward the noise source, the sound pressure level will be displayed on the
meter’s LCD display.
MIN/MAX Function
Press the
MAX MIN INST
button to begin capturing the, Maximum (MAX) OR Minimum (MIN) sound
values. The display will indicate the MAX
or MIN value (depending on which is selected) captured
since the MAX/MIN button was pressed. Press and hold the
MAX MIN INST
button to return to the instantaneous reading mode
Note:
When the meter is measuring the following buttons cannot be used:
•
FAST, SLOW, IMPULSE
•
A/C
Weighting
•
INTEG
TIME
•
RECORD
ERASE
•
DATE/TIME
•
UP/DOWN Arrow keys
