VOLTCRAFT SL-451 - Page 21

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Sound level range: 30 – 130 dB (auto range)
30 – 80 dB/50 – 100 dB/80 – 130 dB
Measuring range: 30 – 130 dB
Accuracy: ±1.4 dB
Frequency range: 31.5 – 8000 Hz
Volume range: 50 dB
Frequency weighting: A and C
Time rating: FAST (125 ms), SLOW (1 s)
Microphone: 1,27 cm (1/2”) electret condenser microphone
Operating altitude: ≤2000 m
Operating temperature: 0 to +40 ºC
Storage temperature: -10 to +60 ºC
Rel. air humidity: 10 – 90 % (Operation)
10 – 75 % (Storage)
Interface: USB
Dimensions (W x H x D): 76 x 278 x 50 mm
Weight: approx. 350 g

Input voltage: 100 – 240 V/AC, 50/60 Hz
Power input: max. 0.25 A
Output voltage: 9 V/DC
Output current: 0.65 A
The following list shows the correction data for the frequency response of the sound impact from the
reference direction (columns “Characteristic”) as well as the error tolerances (column “Accuracy”).
Nominal frequency (Hz) A – Characteristic (dB) C – Characteristic (dB) Accuracy SL - 451 (dB)
31.5
63
125
250
500
1000
2000
4000
8000
-39.4
-26.2
-16.1
-8.6
-3.2
0
+1.2
+1
-1.1
-3.0
-0.8
-0.2
0
0
0
-0.2
-0.8
-3.0
±3.5
±2.5
±2.0
±1.9
±1.9
±1.4
±2.6
±3.6
±5.6
If the sound impact angel deviates from 0º, the following differential values result:
Frequency, kHz ±30º
0.25 to 1 2.3 dB
>1 to 2 2.5 dB
>2 to 4 4.5 dB
>4 to 8 7.0 dB