B&K 2250 Light Manual de usuario Pagina 48

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CHAPTER 4
Specifications
43
4.9.8 Peak C Range
Peak C Range according to the International Standard IEC 61672-1 is: 143 – 31.3 dB
4.10 Detectors
Display-update rates: L
xy
broadband bars and spectra every 0.2 s; all other spectra and numbers
every 1 s.
4.10.1 Exponential Averaging
Exponential averaging times: Fast (250 ms), Slow (2000 ms), Impulse (70 ms + 1500 ms hold time
constant)
Table 4.8
Linear Operating
Range
Frequency-
Weighting
Upper Limit
Lower
Limit
31.5 Hz
(dB)
1kHz
(dB)
4kHz
(dB)
8kHz
(dB)
12.5 kHz
(dB)
All
(dB)
A-weighting 100.6 140 140 138.9 135.7 26.9
C-weighting 137.0 140 139.2 137.0 133.8 27.5
Z-weighting 140 140 140 140 140 32.6
Z-weighting
Extended Low
Frequency
140 140 140 140 140 39.6
BE171211.book Page 43 Thursday, May 27, 2004 1:01 PM
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