Sper-scientific 850014 Sound Level Meter - Mini Manuel d'utilisateur télécharger pdf (Page 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

at 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 uctuating 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.

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Sper-scientific 850014 Sound Level Meter - Mini Manuel d'utilisateur Page 4