22
Measurement frequency range
20 Hz to 8 kHz
Reference frequency
1 kHz
Reference sound pressure level 94 dB
Frequency weighting characteristics
A and C
Time weighting characteristics F (fast) and S (slow)
Level range
Wide range 30 to 130 dB
Peak range* 60 to 130 dB
* Peak range is used when measuring
peak sound level.
RMS detecting circuit
Digital processing
Processing Digital
Sampling interval: 30.3 µs
(
L
p
,
L
eq
,
L
max
,
L
E
,
L
Cpeak
)
Calibration
Internal Calibration:
Electronic calibration using an internal
electronic signal (1 kHz, 94 dB)
Acoustic Calibration :
Using NC-74 (1 kHz, 93.9 dB)
Using NC-72A (250 Hz, 114.0 dB)
Windscreen
Conforms to JIS C 1509-1 class 2 and
JIS C 1516 class 2
IEC 61672-1 class 2 even when the
windscreen is attached
Display
TN positive display, reflective type
Numeric readout
0.1 dB resolution
Bar graph
Scale range 100 dB, resolution 5 dB
(display update cycle 0.1 s)
Warning indications
Over (overload): appears at 137.4 dB (at
1 kHz)
Under (underload): appears at measure-
ment lower limit, -0.6 dB
Battery indication
Battery charge is indicated in 3 stages
Storing processing results
Processing results stored in the internal
memory when processing ends.
Storing capacity: 199 pieces of data
Stored data can be viewed in the recall
www.
GlobalTestSupply
.com
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