感謝以上分享,不過在本案11dBA測試時會拉近至50cm.
理由是ISO7779 1m時多數實驗室之麥克風可能都測不出11dBA,
另ISO7779是基於ECMA-074訂立.
ISO 7779 is Based on the ECMA-74 Standard
- The ECMA standard is more frequently updated.
而ECMA-74 關於麥克風設定8.6條內之8.6.1麥克風位置:
For table-top equipment which normally has a detachable keyboard and which is tested without the keyboard
(e.g. a desk-top personal computer or a video display unit that is tested without a keyboard), the distance from
the front end of the reference box, for purposes of determining the operator position, shall be 0,50 m ± 0,03 m in
front of such equipment (see figure 1, position P4).
規範是電腦用品皆為50cm量測,
但各大風扇商若是採用非電腦用品而用一般工業或電子儀器1m量測也拿他沒皮條.

　　德商風扇廠沒去查，臺牌們應該也都是跟著日商標準吧，以便萬一被下單？∼∼



　　話說您現在造船啊？螺旋槳葉嗎？（帳號的附加訊息）