自動車騒音

Noise Level Measurement Solutions for Vehicle Noise

The XL2 Sound Level Meter provides the dedicated solution for vehicle noise monitoring of cars and motorcycles at the roadside. All measurement data is stored on the SD card. Simultaneously the XL2 may record a wav-file for documentation. The event recorder functionality triggers the measurement by programmable level thresholds.

At a Glance

  • Exhaust noise level
  • ISO 5130, EU directive 70/157/EEC and §29 StVZO
  • Annual inspection and survey of road vehicles

XL2 測定ファンクション

XL2 with M4260 Measurement Microphone

Noise Level SPL

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

How to measure?

  • 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

 

型式承認オプション

PTB型式承認オプションをXL2にインストールすると、XL2-TAへアップグレードします。M2230をXL2-TAに接続しシュラウドジャケットを組み合わせると、IEC 61672:2014、IEC 61260:2014、ANSI S1.4:2014、ANSI S1.11:2014規格に準拠したclass 1サウンドレベルメータとして使用できます。

PTB型式承認サウンドレベルメータの構成

  • XL2-TA サウンドレベルメータ (XL2 に型式承認オプションをインストール済み)
    • ファームウェア V3.11
    • オプション:拡張アコースティックパック
    • オプション:XL2入力キーパッド
  • M2230測定用マイクロホン
  • Shroud MXA01


XL2-TA型式承認証明書のダウンロードはこちら

オーダー情報

Exel Set for Noise Measurements

自動車騒音用Exelセット

セット内容
  • XL2サウンドレベルメータ
  • M2230測定用マイクロホン
  • ASDケーブル
  • 測定テープ
  • Tripod as Microphone Stand
  • XL2用ACアダプタ
  • Exelシステムケース

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