Brüel & Kjær 2240 Guide De L'utilisateur page 17

2) Sliding cover: Underneath the cover is a quick reference guide to help you use the three
control keys for setup and display of measurements. Slide to open, do not press. A diagram
of the quick guide is found in Fig.2.6.
3) Microphone: Brüel & Kjær's Prepolarized Free-field ½" Microphone Type 4188 is used. A
robust and reliable microphone with a wide frequency range.
4) Preamplifier: Conditions the microphone signal before further processing.
5) Display screen: An LCD display showing:
a) the sound level parameter currently being viewed
b) elapsed measurement time
c) measurement reading in dB (decibels)
d) quasi-analogue bar graph representing current sound pressure level
e) battery level indicator
6) Start/Stop key
7) Sound Level Parameter key
available to display (L
8) Sound Level Range key
9) Calibration switch: Adjust instrument calibration using the included screwdriver.
10) Power switch: Turn the instrument on and off.
11) Battery compartment: Slide the compartment's lid to replace batteries when needed.
Instructions on replacing batteries follow in "Installing Batteries" on page 13.
Control Keys
Fig.2.6
Under the front panel's
sliding cover is a quick
guide to help you use the
three control keys
: Press to start or stop a measurement.
: Press to scroll through sound level parameters that are
, L , L , or L
A Aeq Amax Cpeak
: Press to set sound level range (30 – 110 dB or 60 – 140 dB).
L A
30-110dB
L Aeq
60-140dB
L Amax
L Cpeak
(3 sec.=Cal.)
), or hold down for 3 seconds to calibrate.
PART 1
11
English