Vehicle Noise Test Solution

• 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.
• 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.

 

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

 

The Type Approval Option, when installed on your XL2, upgrades the instrument to the XL2-TA, the sound level meter for certified measurements. The XL2-TA, together with the M2230 microphone and Shroud jacket, forms a type-approved sound level meter offering class 1 performance in accordance with IEC 61672:2014, IEC 61260:2014, ANSI S1.4:2014 and ANSI S1.11:2014 standard.

Type approved sound level meter configuration:

• XL2-TA Sound Level Meter (XL2 with Type Approval Option installed)
• Firmware V3.11
• Optional: Extended Acoustic Pack Option
• Optional: XL2 Input Keypad
• M2230 Measurement Microphone
• Shroud MXA01

XL2-TA Type Approval Certificate