407780A
‐
EU
‐
EN
v1.3
4/14
13
Calibration
Calibrating
the
Integrating
Sound
Level
Datalogger
requires
an
acoustical
calibrator
such
as
the
Extech
Model
407766
or
407744.
1.
Configure
the
meter
as
follows:
•
Display:
SPL
(dBA)
•
Time
weighting
mode:
FAST
2.
Insert
the
microphone
into
the
opening
of
the
acoustical
calibrator.
3.
Switch
the
calibrator
ON.
4.
Adjust
the
meter’s
calibration
potentiometer
as
shown
in
the
accompanying
diagram
until
the
meter’s
display
matches
the
acoustical
calibrator
output
signal
(typically
94
or
114dB).
5.
Switch
the
calibrator
OFF.
6.
Remove
the
calibrator
from
the
microphone
very
slowly
to
avoid
damaging
the
microphone.
7.
In
cases
where
adjusting
the
potentiometer
does
not
affect
the
displayed
reading,
or
where
the
adjustment
cannot
produce
the
appropriate
displayed
reading,
please
return
the
unit
for
service.
www.
.com
1.800.561.8187