1[size=1em]测量信号幅度时的单位及其定义为: 1 G0 P2 }7 q, k# e4 Z6 D' D
单位 | | | V | | | Vrms | | | Vp | | | Vpp | | | dBV | | | dBu | | | dBm | (毫瓦分贝)以600Ώ1mW为零电平的分贝 | | dBg | | | dBr | | | dBrinv | | | W | | |
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3 b: f& ?( W4 i$ g. Q: P) H( a Q2[size=1em]相对量的单位! W. x. K. e4 {( f: V; y& p
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功能 | | | THD+N Ratio | | | THD+N Ratio | | 20*lg[(噪声+失真)/(信号+噪声+失真)] | 2-Channel Ratio | | ChA=20*lg(A/B) , ChB=20*lg(B/A) | 2-Channel Ratio | | ChA=100*(A/B) , ChB=100*(B/A) | Crosstalk | | | S/N Ratio | | 20*lg((信号+失真+噪声)/(失真+噪声)) |
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单位 | | Hz | | F/R | | dHz | | Cent | | Octaves | | Decades | | %Hz | | d% | | MdPPM | | PPM | |
+ k) Q/ \4 k2 |+ m3 {模拟信号分析仪
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0 Y& `% T+ W% ~ L% \. E1[size=1em]各测试功能的选择:( A0 r- w1 p- h5 ?1 x5 a
Amplitude | | Bandpass | | Bandreject | | THD+N Ampl | | THD+N Ratio | | SMPTE/DIN | | CCIF | | DIM/TIM | | Wow&Flutter | | 2-Ch Ratio | | Crosstalk | | DFD | 失真(总谐波失真+噪音)测试(以比率形式表示)
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