Subchapter F. CORRECTION FACTORS
Sec.
157.51. Microphone distance correction factors.
157.52. Computation of open site requirements—nonstandard sites.
Cross References This subchapter cited in 67 Pa. Code § 157.41 (relating to site characteristics); and 67 Pa. Code § 157.44 (relating to measurement procedures).
§ 157.51. Microphone distance correction factors.
If the distance between the microphone location point and the microphone target point is other than 50 feet (15.2 meters), the maximum observed sound level reading generated by the motor vehicle in accordance with § 157.44 (relating to measurement procedures) shall be corrected as specified in the following table:
TABLE 2
Distance Correction Factors
If the distance between the microphone location point and the microphone target point is Sound level
correction factor dB (A)26-29 feet -7 29-32 feet -6 32-35 feet -5 35-39 feet -3 39-43 feet -2 43-48 feet -1 48-58 feet 0 58-70 feet +1 70-83 feet +2 83-99 feet +3 99-118 feet +4
§ 157.52. Computation of open site requirements—nonstandard sites.
(a) Microphone distance. If the distance between the microphone location point and the microphone target point is other than 50 feet (15.2 meters), the test site shall be an open site within a radius from both points which is equal to the distance between the microphone location point and the microphone target point.
(b) Diagrams. Plan view diagrams of nonstandard test sites are shown in Figures 2 and 3 of Appendix A of this chapter. Figure 2 illustrates a test site which is larger than a standard test site and is based upon a 60 foot (18.3 meters) distance between the microphone location point and the microphone target point. Figure 3 illustrates a test site which is smaller than a standard test site and is based upon a 35 foot (10.7 meters) distance between the microphone location point and the microphone target point.
APPENDIX A
APPENDIX A (Continued)
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