第 3 章 模拟测量方法
DESCRIPTION
第 3 章 模拟测量方法. 第 3 章 模拟测量方法. 学习辅导 内容. 从信号的特征讲,分为模拟信号和数字信号。 模拟信号是其幅度随时间作连续变化的信号。 无论是何种电参数,只要他属于模拟范畴,就要采用模拟测量方法进行测量。或者不完全属于模拟量,只要采取某种技术措施和手段将其变换成模拟量,就可以采用模拟测量方法进行测量。前提是在变换过程中尽可能减小误差,即使产生误差也不能降低测量精度。模拟测量有多种多样,不管使用何种模拟测量方法进行测量,被测量必须是模拟信号。. 一、本章需要掌握的内容. - PowerPoint PPT PresentationTRANSCRIPT
-
3
Electronic Measurement and Instruments
3
Electronic Measurement and Instruments
123.253.2123.21933.273.2163.2203.273.2163.220
Electronic Measurement and Instruments
4567Q
Electronic Measurement and Instruments
1KFKP2AD536A341KFKP23.75
Electronic Measurement and Instruments
U=IR I=U/R R=U/I P=IU=U2/R=I2R
Electronic Measurement and Instruments
1109Hz1MHz1MHz210-9V 3 (10-110-9) a%Um%Um b%Ux%Ux c(%Ux+%Um)3.1 1.
Electronic Measurement and Instruments
4 Ri//CiRiCi5
Electronic Measurement and Instruments
2.(1) (2)A/D
Electronic Measurement and Instruments
3.2 3.2.1 1.UPUp Um
Electronic Measurement and Instruments
2. u(t)
u(t)=Vpsin(t)=2/T
Electronic Measurement and Instruments
3.2.2 (b)(c)
Electronic Measurement and Instruments
U U(3.2.2)(3.2.2)Urmsu(t)=Vpsin(t)=2/T 3
Electronic Measurement and Instruments
4 ()() KF(3.2.3)
Kp (3.2.4)
Electronic Measurement and Instruments
u(t)=Vpsin(t)=2/T
KF
u(t)=Vpsin(t)=2/T
Electronic Measurement and Instruments
1
Electronic Measurement and Instruments
Electronic Measurement and Instruments
3.2.2 (ACDC) ACDC
Electronic Measurement and Instruments
AC-DC - - ()
Electronic Measurement and Instruments
1-a. b.
2
u
A
u
A
(
a
)
(
)
(
b
)
Electronic Measurement and Instruments
Electronic Measurement and Instruments
HFJ-83mV300MHz - DA3610kHz1000MHz()1mV10VHFJ-83mV300MHz
Electronic Measurement and Instruments
2-
10MHz
u
A
Electronic Measurement and Instruments
1.
Electronic Measurement and Instruments
2.
Electronic Measurement and Instruments
3. 1) E=kU2
Electronic Measurement and Instruments
Iu(t)V Iu(t)u(t)V
R
u
(
t
)
T
0
T
M
u
A
I
Electronic Measurement and Instruments
DA3010Hz~10MHz1mV~300V
Electronic Measurement and Instruments
2) ------ICAD637 ------
Electronic Measurement and Instruments
4. mV 10MHz
Electronic Measurement and Instruments
Electronic Measurement and Instruments
3.2.3 2.
1.
Electronic Measurement and Instruments
u(t)
u(t)u(t)VV
V
(
=
)
u
(
t
)
Electronic Measurement and Instruments
Electronic Measurement and Instruments
kk=1
Electronic Measurement and Instruments
KF
Electronic Measurement and Instruments
3.2.110V9V,
10V
Electronic Measurement and Instruments
Ua10V
Electronic Measurement and Instruments
3.
Electronic Measurement and Instruments
4.
Electronic Measurement and Instruments
3.2.4 3.2.8E0ux
1.3.2.8
Electronic Measurement and Instruments
k().C()i (3.2-13)(3.2-14)(3.2-14)(3.2-14)(3.2-14)
Electronic Measurement and Instruments
Electronic Measurement and Instruments
Vi=Ex-Ef=k(V2- Vo2)
Electronic Measurement and Instruments
ExV2Ex=k1V2 EfVo2Ef =k2Vo2 k1=k2=k ==Vi=Ex-Ef=k(V2- Vo2) Vi=0==Vo=V u(t)
Electronic Measurement and Instruments
Electronic Measurement and Instruments
RMS
Electronic Measurement and Instruments
RMS
Electronic Measurement and Instruments
RMS
Electronic Measurement and Instruments
2.
Electronic Measurement and Instruments
AD536RMS
Electronic Measurement and Instruments
AD536RMS
Electronic Measurement and Instruments
3.2.5
1. 1) 1.
Electronic Measurement and Instruments
1.
Electronic Measurement and Instruments
2)
Electronic Measurement and Instruments
(2)(3)2.(1)
Electronic Measurement and Instruments
3.2.35V
3.
Electronic Measurement and Instruments
4.
Electronic Measurement and Instruments
1.CQ1=Q23.2.6
Electronic Measurement and Instruments
Up
Electronic Measurement and Instruments
Electronic Measurement and Instruments
2.
Electronic Measurement and Instruments
Electronic Measurement and Instruments
3.4.
Electronic Measurement and Instruments
5.(1)(2)
Electronic Measurement and Instruments
6.
Electronic Measurement and Instruments
50 50
Electronic Measurement and Instruments
Electronic Measurement and Instruments
Electronic Measurement and Instruments
3.3 3.3.1
Electronic Measurement and Instruments
3.3.2
Electronic Measurement and Instruments
3.3.3
Electronic Measurement and Instruments
(1)1.Uni(2)
Electronic Measurement and Instruments
(3)(4)
Electronic Measurement and Instruments
(1)3.
Electronic Measurement and Instruments
(2)3.
Electronic Measurement and Instruments
4.(1)(2)
Electronic Measurement and Instruments
(1)5.
Electronic Measurement and Instruments
Electronic Measurement and Instruments
(2)Uni
Electronic Measurement and Instruments
Electronic Measurement and Instruments
(3)I-I+
Electronic Measurement and Instruments
Electronic Measurement and Instruments
Electronic Measurement and Instruments
Electronic Measurement and Instruments
3.4 3.4.1 1.(dB)2.
Electronic Measurement and Instruments
3.(1)dBm(2)dBV4.(VU)
Electronic Measurement and Instruments
3.4.2
Electronic Measurement and Instruments
3.5 3.5.1
Electronic Measurement and Instruments
3.5.2
Electronic Measurement and Instruments
3.5.3 1. T
Electronic Measurement and Instruments
2.T
Electronic Measurement and Instruments
T1000Hz3dB50HzC=103,RT=10K
Electronic Measurement and Instruments
Electronic Measurement and Instruments
3. RCR1=2R2,C1=C2=C,R3=R4=R
Electronic Measurement and Instruments
Electronic Measurement and Instruments
1.3.5.4
Electronic Measurement and Instruments
10% 10%2.(1)(2) (3) (4) (5) (6) (7)
Electronic Measurement and Instruments
3.6.1 3.6
Electronic Measurement and Instruments
Electronic Measurement and Instruments
Electronic Measurement and Instruments
Electronic Measurement and Instruments
Electronic Measurement and Instruments
3.6.3 3.6.2
Electronic Measurement and Instruments
Q Q=2 / 1 2 D Q 3 3.7 Q
Electronic Measurement and Instruments
3.7 Q3.7.1 Q
Electronic Measurement and Instruments
Electronic Measurement and Instruments
3.7.2 1 YZ 2
Electronic Measurement and Instruments
3.7.2 ZXZ4Z2Z3 1 ZX2 3 ZX=RXZ2=R2Z3=R3Z4=R47.12 RXR2R3R4 (4)10-5
Electronic Measurement and Instruments
3.7.2 1.
Electronic Measurement and Instruments
Electronic Measurement and Instruments
2.
Electronic Measurement and Instruments
Electronic Measurement and Instruments
3. Es1V1KHz 10KHz