4
3. OPERATING INSTRUCTIONS
Keep the microphone dry and avoid strong
vibrations. Use the
WINDSCREEN
(1) at wind
speeds over 10m/sec.
3-A. MEASURING PROCEDURE
• Turn the meter on by pressing the
POWER
(9)
button. The meter defaults to the A frequency
and FAST response.
• Press the
A/C
(4) button to toggle between
frequency scales. The A scale is shown as
“dBA” and the C scale is shown as “dBC”.
Select the A scale to simulate the human ear’s
response. A is generally used for environmental
measurements. The C scale approximates a
flat response and is typically used to measure
low-frequency machinery noise where the
target sound level is already known.
• Press the
FAST/SLOW
(6) button to toggle
between response-time scales. Select FAST
for general applications and SLOW to check the
avg. level of fluctuating noise, like machinery.
• Point the
MICROPHONE
(2) at the sound
source. The decibel level is displayed.
•
Press the
BACKLIGHT
(7) button to turn
on/off the illuminated display. The backlight
auto-matically turns off after 15 seconds.
•
Press the
POWER
(9) button to turn the meter off.
