Code of Federal Regulations Title 40. Protection of Environment § 40.86.884–14 Calculations

(a) If the measured half-second opacity values were obtained with a smokemeter with an optical path length different than shown in the table in § 86.884–8(c), then convert the measured half-second values or the original instantaneous values to the appropriate equivalent optical path length values specified in the table. Convert the opacity values according to the following equations:

L_m and L_s must use consistent units in the above equation

Where:

N_m=Measured half-second value for conversion, percent opacity

L_m=Measuring smokemeter optical path length, meters

L_s=Standard optical path length corresponding with engine power, n

N_s=Standard half-second value, percent opacity

(b) Average the 45 readings in § 86.884–13(d)(3) or the equivalent converted values from paragraph (a) of this section if appropriate, and designate the value as “A”. This is the value for the engine acceleration mode.

(c) Average the 15 readings in § 86.884–13(d)(4) or the equivalent converted values from paragraph (a) of this section if appropriate, and designate the value as “B”. This is the value for the engine lugging mode.

(d) Average the 9 readings in § 86.884–13(d)(5) or the equivalent converted values from paragraph (a) of this section if appropriate, and designate the value as “C”. This is the value for the peaks in either mode.