1[size=1em]测量信号幅度时的单位及其定义为:
5 M/ Z% k1 W) q: @
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 | | |
! _: a) K' B4 Q9 _( ~& o n" t0 N! D5 n* D+ v
2[size=1em]相对量的单位! g+ I- P% X8 g& Y+ z Y
/ C% M5 ~4 \* z, F. U9 P4 L3 A
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)) |
8 r" L+ N9 A3 ^3[size=1em]频率单位2 S/ t9 ^! [3 R, Y4 Q/ m
0 R/ r/ E8 l1 i; t* [
单位 | | Hz | | F/R | | dHz | | Cent | | Octaves | | Decades | | %Hz | | d% | | MdPPM | | PPM | |
4 C. `+ O8 G, ]: g* R/ m模拟信号分析仪
' ?& U+ @' _; A; a8 I6 M
* M' v7 S1 D! n# Y9 @' r1[size=1em]各测试功能的选择: V! {! H) @- m: E/ p8 w- u( f/ t0 j
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)
. A- @7 w* e ]) E- g+ w
|
8 E: u: e5 C- B) U, s# @ I3 i |