1[size=1em]测量信号幅度时的单位及其定义为: 3 L; Z0 L% Y6 L8 d, z0 ]! @5 v
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 | | | 6 L) v H0 w1 W* b4 I$ C
, Y- v7 \5 E$ t7 c; T" h" x) W, v2[size=1em]相对量的单位2 O; J3 T w0 c! {; Y" C% p$ L$ F
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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)) |
9 o# i* G& ?8 n% }' d8 ]3[size=1em]频率单位
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单位 | | Hz | | F/R | | dHz | | Cent | | Octaves | | Decades | | %Hz | | d% | | MdPPM | | PPM | |
1 r. @, M0 a5 f0 t3 o7 P% e模拟信号分析仪
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1[size=1em]各测试功能的选择:
4 a/ j1 M, d p& ^" WAmplitude | | 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) 1 P i1 r0 Z S v- y; H
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