Casella-cel CEL-440 Manual de usuario descargar pdf (Pagina 64)

Criteria 3 ensures that even when the meter is unable to reach a

steady L

, it will have measured for long enough to have as good an L

as the source permits, without measuring for extremely lengthy periods.

Using a typical pink noise source, autoscans take around 20

seconds for all octaves installed, and about 60 seconds for all third

octaves installed. Scanning times can be shortened by restricting the

number of bands to be measured.

A settling time for each band plus a minimum time to obtain an

adequate reading in the band are factory set in the meter and are listed

below. The maximum measurement time per band for Criterion 3 is

always fixed at 4 times the minimum measurement time.

Table 2: Octave Band Settling and Minimum Measurement Times

(Maximum Measurement Time is Four Times Minimum)

Table 3: Third-Octave Band Settling and Minimum Measurement Times

(Maximum Measurement Time is Four Times Minimum)

Specification

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Casella-cel CEL-440 Manual de usuario Pagina 64