407790A-en-US_v2.0 8/16
3
1.
Introduction
Congratulations
on
your
purchase
of
the
Extech
407790A
Real
Time
Octave
Band
Analyzer.
This
auto
ranging
Type
2
integrating
sound
level
meter
features
1/1
and
1/3
Octave
Band
real
‐
time
noise
analyses.
The
407790A
offers
five
measurement
parameters:
SPL
(Sound
Pressure
Level),
Leq
(Equivalent
Continuous
Sound
Pressure
Level),
SEL
(Sound
Exposure
Level),
Lmax
(Maximum
Sound
Pressure
Level),
and
Lmin
(Minimum
Sound
Pressure
Level).
The
built
‐
in
memory
stores
12,280
data
records
in
sound
level
mode
and
1024
records
in
Octave
mode.
The
stored
data
can
be
easily
transferred
to
a
PC
with
the
407790A
software
and
USB
cable.
This
meter
permits
choice
of
‘A’,
‘C’,
or
Flat
’Z’
weighting
and
Slow
/
Fast
/impulse
response
times.
AC
and
DC
analog
output
signals
are
available
for
chart
recorders
and
other
external
recording
devices.
Careful
use
of
this
device
will
provide
years
of
reliable
service.
