Cal. Code Regs. Tit. 13, § 1043 - Instrumentation Requirements
(a) Sound Level Meter. Sound level meters
used for measurements of vehicles in use shall meet the requirements for Types
1, 2, S 1 A, or S
2 A in the American National
Standard Specification for Sound Level Meters S
1.4-1971 or
1983, the requirements for Type 1,
2, 1A, or 2A in the International Electrotechnical Commission Publication 651,
"Sound Level Meters," or the requirements in the International Electrotechnical
Commission Publication 179, "Precision Sound Level Meters." Sound level meters
used for new-vehicle measurements shall meet the Type 1 or S
1 A requirements of the American
National Standard Specification for Sound Level Meters, S
1.4-1971 or
1983. As an alternative to making
direct measurements using a sound level meter, a microphone or sound level
meter may be used with a magnetic tape recorder and/or a graphic level recorder
or other indicating instrument provided the system meets the requirements of
SAE J184a, July 1978.
(b) Sound
Level Calibrator--An acoustic sound level calibrator of the microphone coupler
type shall be used to calibrate the entire sound level measurement system. The
calibrator shall be calibrated at least annually.
(c) Tachometer--An engine speed tachometer
with an accuracy of ± 2% of the meter reading shall be used to determine
when maximum rpm is attained in new-vehicle tests.
(d) Anemometer--An anemometer with an
accuracy of ± 10% of the reading for wind speeds of 19.3 to 33.2 km/h
(12 to 20 mph) shall be used to measure the wind speed at the measurement site
at times when there is wind.
(e)
Windscreen--A properly installed microphone windscreen recommended by the
manufacturer of the sound level meter may be used.
Notes
2. Amendment of subsection (a) filed 11-20-84; effective thirtieth day thereafter (Register 84, No. 47).
Note: Authority cited: Sections 23130, 23130.5, 27200, 27207 and 38370, Vehicle Code. Reference: Sections 23130, 23103.5, 27200- 27207 and 38370, Vehicle Code.
2. Amendment of subsection (a) filed 11-20-84; effective thirtieth day thereafter (Register 84, No. 47).
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