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- 声学楼论坛 (http://www.nju520.com/bbs/index.asp)
-- 测量、试验及标准室 (http://www.nju520.com/bbs/list.asp?boardid=9)
---- EIA-426-B信号 (http://www.nju520.com/bbs/dispbbs.asp?boardid=9&id=4687)
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-- 作者:darry
-- 发布时间:2006-12-11 22:22:22
-- EIA-426-B信号
请教:ALMA的EIA-426-B测试碟里面的Track2的信号和阳光的8121C杂音产生器上的EIA-426-B信号是一样的? 如果用来做Power Test,两者到底有没差别?
[此贴子已经被作者于2006-12-15 21:45:52编辑过]
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-- 作者:darry
-- 发布时间:2006-12-14 19:54:23
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没有兄弟对此有研究,肯来讨论一下?
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-- 作者:水仙
-- 发布时间:2006-12-15 20:45:55
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ALMA的EIA-426-B测试碟里面的Track2的信号,用COOL EDIT分析过频谱,完全符合426B的标准. 阳光的8121C杂音产生器上的EIA-426-B信号,改天接到电脑上分析一下.(听声音是一样)
[此贴子已经被作者于2006-12-16 08:29:01编辑过]
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-- 作者:darry
-- 发布时间:2006-12-15 21:15:34
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好像有个说法是8121C的EIA-426-B信号是EIA-426-B碟信号幅度的2倍(如果设置相同的话); 期待老师的确认结果,谢谢
[此贴子已经被作者于2006-12-15 21:46:45编辑过]
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-- 作者:darry
-- 发布时间:2006-12-15 21:16:34
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老师能否将用cool edit分析的EIA-426-B碟的Track2信号的频谱贴上来看看;谢谢
[此贴子已经被作者于2006-12-15 21:18:39编辑过]
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-- 作者:水仙
-- 发布时间:2006-12-15 21:30:25
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家里没有碟片,改天吧. 幅度可能分析不出来(难以控制CD信号和阳光仪输入到声卡的真正幅度等同)
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-- 作者:darry
-- 发布时间:2006-12-15 21:44:38
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更正一下,上面所提到的应该是阳光8121C杂音产生仪;不是7116C扫频仪
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-- 作者:darry
-- 发布时间:2006-12-15 21:56:08
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所以我需要澄清的是:如果需要用EIA-426-B的信号做POWER TEST(如果电压设定为10V) 1.使用DVD播放EIA-426-B测试碟Track2的信号,再接入功放,用功放的输出接被测试的喇叭并调试到需求的电压; 2.使用阳光的8121C杂音产生仪直接接被测试的喇叭并调试到需求的电压; 这两种方法是一样的吗?
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-- 作者:水仙
-- 发布时间:2006-12-15 21:58:34
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公司有阳光的8121B和8121C仪器,一种有426A滤波,一种有426B滤波,确实想对比一下频谱.(可惜没高档声卡,阳光仪器的白噪声高频到100KHz)
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-- 作者:水仙
-- 发布时间:2006-12-16 8:30:25
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此主题相关图片如下:

最大峰值电平:-6dB
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-- 作者:水仙
-- 发布时间:2006-12-16 8:32:17
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上面是CD碟的频谱包络图. 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21877.734 -82.584899902 -82.584899902 21920.8 -82.455909729 -82.455909729 21963.867 -82.500244141 -82.500244141 22006.933 -82.447769165 -82.447769165
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-- 作者:水仙
-- 发布时间:2006-12-16 8:44:36
--
EIA426A:
此主题相关图片如下:

对比曲线!
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-- 作者:水仙
-- 发布时间:2006-12-16 8:47:36
--
EIA426B:
此主题相关图片如下:

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-- 作者:水仙
-- 发布时间:2006-12-16 8:56:43
--
此主题相关图片如下:

EIA-426-B测试碟Track2的信号 FFT取点最大时
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-- 作者:水仙
-- 发布时间:2006-12-16 8:59:35
--
可惜低频刻度(100Hz以下)显示不够,但中高频趋势是对的.
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-- 作者:水仙
-- 发布时间:2006-12-16 11:01:53
--
此主题相关图片如下:

这是8121C的EIA RS426B的
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-- 作者:水仙
-- 发布时间:2006-12-16 11:05:47
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此主题相关图片如下:
 IEEE219
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-- 作者:水仙
-- 发布时间:2006-12-16 11:50:28
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此主题相关图片如下:

DIN45573
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-- 作者:水仙
-- 发布时间:2006-12-16 11:55:22
--
此主题相关图片如下:
 8121C的PINK 20-20K
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-- 作者:水仙
-- 发布时间:2006-12-16 11:59:38
--
此主题相关图片如下:

WHITE NOISE
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