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 m ethod.
• Room Criterion Curves (RC) –calculates a numerical rating based on
speech interference and indicates any interference s uch as hissing,
rumbling, or vibration. (This method was introduced to deter mine noise in
offices/room acoustics.)
• Balanced Noise Criterion Curves (NCB) –are one of the newer
methods that indicate interference from rum ble, rattle, and hiss.
• Noise Rating Curves (NR) – used primarily in Europe, Australia, and
other country’s room and building acoustic measur ements, HVAC
studies, machine noise evaluations, and for som e community noise
enforcement applications.
Setting up criterion curves Setting up criterion curves is similar to setting up c aptured 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