407780A
‐
EU
‐
EN
v1.3
4/14
18
Calibration:
Acoustical
calibrator
(Extech
407744
or
equivalent)
Calibration
check
frequency
is
1000Hz.
Nominal
calibration
level
for
the
free
field:
94.1dB
Nominal
calibration
level
for
the
diffuse
field:
94.0dB
Frequency
for
acoustic
testing:
8000Hz
Warm
‐
up
time:
≤
2min
Sampling
interval:
Bar
graph
indication
125
ms
approx.
Numeric
indication
1
sec
approx.
Data
record
capacity:
Data
can
be
stored
in
memory.
Max.
32000
readings
can
be
stored
Max.
255
blocks
LCD
Display
Display
screens:
4
digit
numerical
indication
of
sound
level,
from
30.0
to
130.0dB
with
0.1dB
resolution.
Bar
‐
graph
indication
of
current
sound
level
with
1dB
resolution.
Sound
level
range
indicator:
30–90dB,
40–100dB,
50–110dB,
60–120dB
or
70–130dB
in
five
ranges.
Time
display;
year
–
month
–
day
and
hour:
minute:
second.
Display
update
rate:
1
second
Display’s
start
‐
up
indication:
Depends
on
the
condition
of
meter
when
it
was
last
switched
off.
Warning
indications:
Out
‐
of
‐
range
indications:
OVER
displayed
at
upper
limit
of
the
range
UNDER
displayed
at
lower
limit
of
the
range
Outputs
AC
output
(using
selected
frequency
weighting)
Output
voltage:
2Vrms
(at
full
‐
scale
of
the
range)
Output
impedance:
5k
Ω
Load
impedance:
≥
1M
Ω
DC
output
Output
voltage:
10mV/dB
Output
impedance:
5k
Ω
Load
impedance:
≥
1M
Ω
I/O
connector:
Sound
level
meter
control
from,
and
data
output
to,
PC
(USB)
Alarm
output:
5Vdc,
typical
www.
.com
1.800.561.8187
