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Subject: Determination of voltage at loudspeaker terminals
Question:
Is the apparatus to be operated in a way as to deliver one-eighth of the NON-CLIPPED OUTPUT POWER to the RATED LOAD IMPEDANCE also for the alternative test method described in paragraph 3 of clause 4.2.4(a)?
Decision:
When determining whether a part or terminal is hazardous live acc. to 9.1.1 and 11.1 at the manufacturer's option the apparatus may also be operated in such a way as to deliver one-eight of the NON-CLIPPED OUTPUT POWER for requirements of 9.1.1 and the maximum NON-CLIPPED OUTPUT POWER for requirements of 11.1 to the RATED LOAD IMPEDANCE using a 1 kHz signal.
問題:
設(shè)備是否按照4.2.4(a)第三段所述的代替方法,在額定負(fù)載阻抗上施加1/8非削波輸出功率?
決定:
當(dāng)確定一個組件或端子是否存在危險帶電時,9.1.1條款施加1/8非削波輸出功率,11.1條款施加最大非削波輸出功率,使用1kHz音頻信號。
提示:
使用1kHz的原因主要是出于試驗操作簡單,以及結(jié)果的可復(fù)現(xiàn)性,發(fā)熱溫升試驗中也可以使用1kHz作為信號源輸入,可以認(rèn)為使用1kHz跟粉紅噪聲在發(fā)熱溫升上的結(jié)果差異不大。
但如果存在爭議時,還是應(yīng)按標(biāo)準(zhǔn)使用粉紅噪聲。
音頻相關(guān)參考文獻(xiàn)見以下:
1、DSH 288/289(IEC 60065)半導(dǎo)體器件區(qū)分/音頻放大器故障條件
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