Handheld Solution for Vehicle Noise Inspection

• Simple operation by one person
• Calibrated sound level meter with class 1 frequency response according to IEC 61672
• Complete measurement kit including tripod and tape
• Improved efficiency by dedicated measurements profiles
• Automated sound level documentation and wav-file logging

• Sound pressure level SPL
  Measuring the following parameters:
  • LAFmax (maximum sound level with A-weighting)
  • LAeq (averaged sound level for environmental noise verification).

Screenshot Sound Level Meter

• The environmental noise LAeq shall be at least 10 dB below the measured A-weighted exhaust noise level.
• Position the measurement microphone directed towards the exhaust pipe at a distance of 0.5 m at a 45° angle in the same height; the height shall be minimum 0.2 m above ground.
• Connect the XL2 Analyzer with the 5 m ASD cable to the measurement microphone.
• Start the XL2 with the measurement profile ISO 5130
• Increase the engine speed gradually from idle to the measurement rpm according the table below:

  Rated engine speed	Measurement rpm	Application
  < 5000 rpm	75% of rated rpm	road vehicles having at  least four wheels
  5000 - 7500 rpm	3750 rpm	any road vehicles
  > 7500 rpm	50% of rated rpm	any road vehicles

• Start the measurement.
• Hold the measurement rpm for one second and release the throttle control rapidly, thus the engine speed returns to idle.
• The measurement stops automatically after the entire deceleration period.
• Repeat the measurement until LAFmax is within 2 dB for three consecutive measurements.
• The final result LAFmax is calculated as average of these 3 measurement results.

Exel Acoustic Set

Description	NTi Audio #
Exel Set for Vehicle Noise Inspection (with M2210 Measurement Microphone offering Class 1 frequency response)	special