Pulsar Instruments Plc

Noise testing equipment for vehicle noise monitoring - Health and Safety - Noise and Vibration

In a world where there is a drive for everything to be quieter, vehicle noise measurement and control is a growing application. If measurements need to be made to ISO 5130:2007, which is an internationally recognised standard for vehicle exhaust noise testing, a more detailed measurement needs to be made. ISO 5130:2007 requires three consecutive measurements to ensure repeatability. These measurements are taken at a specified engine speed, or RPM, and the maximum sound level produced during the test is taken.

Exhaust noise is assessed during the emissions test for the vehicle or by revving the engine to around 2,500rpm or half the maximum engine speed if this is lower on vehicles not subject to an emissions test. Exhaust noise from the vehicle must not be unreasonably above the noise level normally expected from a similar vehicle with a standard silencer in average condition.

ISO 5130:2007 is an internationally recognised standard for vehicle exhaust noise testing and requires three consecutive measurements to be taken to ensure repeatability. These measurements are taken at a specified engine speed, or RPM, and the maximum sound level produced during the test is taken.

Once three valid measurements have been made, the highest is taken and used as the valid result. The microphone can be placed at the specified measurement position, typically 45 degrees and 0.5m from the exhaust of the vehicle under test.

The Model 91 Sound Level Meter is the ideal instrument for these measurements. The pre-amplifier can be removed from the instrument, connected via a cable and located next to the exhaust in the correct position. This allows the sound level meter to be read from the driver’s seat so the correct engine speed can be set.