3M SP-DL-1, Руководство пользователя

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92 Criterion curve families
Setting up criterion curves
Models SE and DL
•
Preferred Noise Criterion Curves (PNC)
– uses a tangency method but
accounts for lower frequencies compared with the NC method.
•
Room Criterion Curves (RC)
–calculates a numerical rating based on
speech interference and indicates any interference such as hissing,
rumbling, or vibration. (This method was introduced to determine noise in
offices/room acoustics.)
•
Balanced Noise Criterion Curves (NCB)
–are one of the newer
methods that indicate interference from rumble, rattle, and hiss.
•
Noise Rating Curves (NR)
– used primarily in Europe, Australia, and
other country’s room and building acoustic measurements, HVAC
studies, machine noise evaluations, and for some community noise
enforcement applications.
Setting up criterion curves
Setting up criterion curves is similar to setting up captured curve parameters.
However, with criterion curves, you select a specific curve type and then it is
applied during your study (or test).

Setting up criterion curves and appropriate measurement type
1. From the start screen, select either 1/1 octave or 1/3 octave for the
measurement type. (Repeatedly press first softkey.)
Figure 6-12: Selecting measurement type for curves
2. Next, select the measurement type, by selecting
View Session
(use Up/Down
Arrow to select) and press
Enter
. Select the appropriate meter 1 settings
(using the softkeys) and set the response time, weighting, and measurement
type. (See Figure 3-4, page 27for an example).
Selecting Measurement type
Press first softkey until 1/1 or
1/3 is selected