This document discusses various types of AC bridges used to measure inductances and capacitances, including their operating principles and examples. It describes AC bridges such as the basic AC bridge, Maxwell bridge, Hay bridge, Schering bridge, Wien bridge, and the use of Wagner ground connection to reduce stray capacitances in bridge circuits. The key applications of AC bridges are measuring inductances, capacitances, frequencies, and characterizing capacitors.
Introduction to Angle Modulation, Types of Angle Modulation, Frequency Modulation and Phase Modulation Introduction, Generation of FM, Detection of FM, Frequency stereo Multiplexing, Applications, Difference between FM and PM.
Introduction to Angle Modulation, Types of Angle Modulation, Frequency Modulation and Phase Modulation Introduction, Generation of FM, Detection of FM, Frequency stereo Multiplexing, Applications, Difference between FM and PM.
The presentation covers asynchronous sequential circuit analysis; Map, transition table, flow table. It also covers asynchronous circuit design process and race conditions
Jitter measurements are commonly done taking small snapshots in time, yet systems often experience jitter from sources that occur over relatively long time intervals, which may not be accounted for using short time interval measurements methods.
In this webinar we will present the application of a real time, digital clock recovery and trigger system to the measurement of jitter on clock and data signals. Details of the measurement methodology will be provided along with measurement examples on both clock and data signals.
You Will Learn:
- What is Jitter
- Different types of Jitter
- Jitter measurement techniques
- Benefits of Jitter analysis using real-time DDC techniques
Details: https://electronicsembeddedworld.blogspot.com/2018/06/performance-management-mcq.html
FM demodulation involves changing the frequency variations in a signal into amplitude variations at baseband, e.g. audio. There are several techniques and circuits that can be used each with its own advantages and disadvantages.
In any radio that is designed to receive frequency modulated signals there is some form of FM demodulator or detector. This circuit takes in frequency modulated RF signals and takes the modulation from the signal to output only the modulation that had been applied at the transmitter.
There are several types of FM detector / demodulator that can be used. Some types were more popular in the days when radios were made from discrete devices, but nowadays the PLL based detector and quadrature / coincidence detectors are the most widely used as they lend themselves to being incorporated into integrated circuits very easily...
The presentation covers asynchronous sequential circuit analysis; Map, transition table, flow table. It also covers asynchronous circuit design process and race conditions
Jitter measurements are commonly done taking small snapshots in time, yet systems often experience jitter from sources that occur over relatively long time intervals, which may not be accounted for using short time interval measurements methods.
In this webinar we will present the application of a real time, digital clock recovery and trigger system to the measurement of jitter on clock and data signals. Details of the measurement methodology will be provided along with measurement examples on both clock and data signals.
You Will Learn:
- What is Jitter
- Different types of Jitter
- Jitter measurement techniques
- Benefits of Jitter analysis using real-time DDC techniques
Details: https://electronicsembeddedworld.blogspot.com/2018/06/performance-management-mcq.html
FM demodulation involves changing the frequency variations in a signal into amplitude variations at baseband, e.g. audio. There are several techniques and circuits that can be used each with its own advantages and disadvantages.
In any radio that is designed to receive frequency modulated signals there is some form of FM demodulator or detector. This circuit takes in frequency modulated RF signals and takes the modulation from the signal to output only the modulation that had been applied at the transmitter.
There are several types of FM detector / demodulator that can be used. Some types were more popular in the days when radios were made from discrete devices, but nowadays the PLL based detector and quadrature / coincidence detectors are the most widely used as they lend themselves to being incorporated into integrated circuits very easily...
The inverse quantity is electrical conductance, and is the ease with which an electric current passes. Electrical resistance shares some conceptual parallels with the notion of mechanical friction. The SI unit of electrical resistance is the ohm (Ω), while electrical conductance is measured in siemens (S).
Ohm's Law V = I x R (Volts = Current x Resistance). The Ohm (Ω) is a unit of electrical resistance equal to that of a conductor in which a current of one ampere is produced by a potential of one volt across its terminals. 1)Measurement of Low resistance: 1) Ammeter Voltmeter method: This is very popular method for measurement of medium resistances since ...
Signal conditoning
Bab ini akan membantu Anda memahami mengapa pengkondisian sinyal yang diperlukan dalam proses kontrol dan untuk membiasakan Anda dengan metode pengkondisian sinyal.
Berikut akan dibahas dalam bab ini:
• Konversi sinyal sensor menjadi sinyal listrik atau pneumatik
• Sinyal Linearisasi, metode pengaturan level sinyal nol, dan rentang
• Nonlinear analog amplifier
• digital Linearisasi
• Perbedaan antara sensor, transduser, dan konverter
• Conditioning untuk menampilkan lokal dan transmisi
• Suhu kompensasi digunakan dalam pengkondisian sinyal
• Pengkondisian sinyal digunakan dengan efek Hall dan elemen magneto resistif
(MRE) perangkat
• Pertimbangan menggunakan perangkat kapasitif
• Ketahanan suhu detektor (RTD) pengkondisian sinyal
Use s parameters-determining_inductance_capacitancePei-Che Chang
1. Use s parameters-determining_inductance_capacitance
2. Relationship Between Common Circuits and the ABCD Parameters
3. Converts Z-parameters to S-parameters
4. Relationships Between Two-Port S and ABCD Parameters
5. Via and equivalent circuit
A brief session including the introduction about the RLC resonance circuit placed in series. Also discussed about the mathematical calculations and verification of formula. Circuit diagrams are included as well as the graphs to enhance the better view for the viewer. This is a wholesome package for the engineers at the first stage of their aim.
1. Signal Conditioning for
Electronic Instrumentation
AC Bridges
1
MCT 3332 : Instrumentation and Measurements
Dr. Hazlina Md Yusof
Department of Mechatronics Engineering
International Islamic University Malaysia
2. Analog Signal Conditioning
AC Bridges
2
• Used to measure inductance and capacitances
• Applied in communication systems and complex
electronic circuits
- Used for shifting phase, providing feedback paths for
oscillators or amplifiers, filtering out undesired signals and
measuring the frequency of audio signals
• Operates on balanced condition
- Reactance and resistive
components are balanced
3. Analog Signal Conditioning
AACC BBrrididgge:e Bsa lance Condition
B
I1 I2
D
Z1
Z2
A C
Z4 Z3
D
all four arms are considered as impedance
(frequency dependent components)
The detector is an ac responding device:
headphone, ac meter
Source: an ac voltage at desired frequency
Z1, Z2, Z3 and Z4 are the impedance of bridge arms
At balance point: or BA BC 1 1 2 2 E =E IZ =IZ
General Form of the ac Bridge
I = V I = V
and 1 2
Z +Z Z +Z
1 3 2 4
V
1 4 2 3 Z Z =Z Z
Complex Form:
Polar Form: Magnitude balance:
4.
5. 1 4 1 4 2 3 2 3 Z Z ‘T ‘T =Z Z ‘T ‘T
Phase balance:
1 4 2 3 Z Z =Z Z
1 4 2 3 ‘T ‘T =‘T ‘T 3
6. Analog Signal Conditioning
AC Bridges
4
Exam ple The impedance of the basic ac bridge are given as follows:
o
Z
100 :‘
80 (inductive impedance)
o
1
3
Z
250 :
(pure resistance)
2
4
Determine the constants of the unknown arm.
SOLUTION The first condition for bridge balance requires that
400 30 (inductive impedance)
unknown
‘ :
Z
Z
2 3
4
1
250 400 1,000
100
Z Z Z
Z
u
:
The second condition for bridge balance requires that the sum of the phase angles of
opposite arms be equal, therefore
o
4 2 3 1 ‘T =‘T ‘T ‘T 0 30 80 50
Hence the unknown impedance Z4 can be written in polar form as
o
4 Z 1,000 : ‘ 50
7. Analog Signal Conditioning
AC Bridges
Example 7
An ac bridge is in balance
with the following constants:
arm AB, R = 200 Ω in series
with L = 15.9 mH R; arm BC, R
= 300 Ω in series with C =
0.265 μF; arm CD, unknown;
arm DA, = 450 Ω. The
oscillator frequency is 1 kHz.
Find the constants of arm CD.
Example an ac bridge is in balance with the in series with L = 15.9 mH R; arm BC, R = 300 unknown; arm DA, = 450 :. The oscillator frequency arm CD.
SOLUTION
B
V I1 I2 1
A C
The general equation for bridge balance states 5
This result indicates that Z4 is a pure inductance at at frequency of 1kHz. Since the inductive obtain L = 23.9 mH
D
Z1
Z2
Z4 Z3
D
450 (200 (300 u
Z = Z Z
2 3
4
Z
9. Capacitance Comparison Bridge
Example 8
A similar angle bridge is used to measure a
capacitive impedance at a frequency of 2kHz. The
bridge constant at balance are
C3 =100μF R1=10k Ω
R2=50k Ω R3=100k Ω
Find the equivalent series circuit of the unknown
impedance
7
10. Comparison Bridge: Inductance
Measure an unknown inductance or
capacitance by comparing with it with a known
inductance or capacitance.
D
R2
R1
L3
Rx
Lx
R3
Diagram of Inductance
Comparison Bridge
At balance point: 1 x 2 3 Z Z =Z Z
where
Unknown
inductance
1 1 2 2 3 3 3 Z =R ;Z = R ; and Z R jZ L
11.
12. 1 x x 2 S S R R jZ L R R jZ L
R R R
L L R
2
Separation of the real and imaginary terms yields: 2 3
1
x
R
3
1
x
R
and
Frequency independent
To satisfy both balance conditions, the bridge must contain two variable
elements in its configuration.
Vs
8
Analog Signal Conditioning
AC Bridges
Inductance Comparison Bridge
15. 1 23
1
1
x x R R j L RR
j C
Z
Z
which expands to
Unknown
inductance
D
R2
R1
C1
R3 Rx
Lx
R R L x jR x
j L R
R R
x x
1 1 2 3
C C
1 1
Z
Z
R R L x
R R
1 23
1
x
C
R L R
C
1
1
x
x
Z
Z
Solve the above equations simultaneously
(1)
(2)
10
Analog Signal Conditioning
AC Bridges
Hay Bridge
16. Analog Signal Conditioning
AC Hay Bridges
Bridge: continues
Hay Bridge
L R R C
2 3 1
2 2 2
x
1 Z C R
1 1
2 2
R C R R R
1 1 2 3
2 2 2
x
1 C R
1 1 Z
Z
ZLx
Z
Rx
TL
R1
Z
TC
ZC1
and
Phasor diagram of arm 4 and 1
X Z
L Q
R R
tan L x
T
L
x
tan C 1
1 1
C
X
R C R
T
Z
tan tan or 1 L C Q
C R
1 1
T T
Z
Thus, Lx can be rewritten as
L R R C
2 3 12
1 (1/ ) x
Q
For high Q coil ( 10), the term (1/Q)2 can be neglected x 2 3 1 L | R R C 11
18. Schering Bridge: continues
D R Z
R C
Dissipation factor of a series RC circuit: x
x x
x
X
Dissipation factor tells us about the quality of a capacitor, how close the
phase angle of the capacitor is to the ideal value of 90o
x x 1 1 For Schering Bridge: D Z R C Z R C
For Schering Bridge, R1 is a fixed value, the dial of C1 can be calibrated directly in D
at one particular frequency
13
Analog Signal Conditioning
AC Bridges
Schering Bridge
20. Wagner Ground Connection
C
A D
B
R2
R1
1
2
C3 Rx
R3 Cx
Rw
Cw
C1 C2
D
Diagram of Wagner ground
One way to control stray capacitances is by
Shielding the arms, reduce the effect of stray
capacitances but cannot eliminate them
completely.
Wagner ground connection eliminates some
effects of stray capacitances in a bridge circuit
Simultaneous balance of both bridge makes the
point 1 and 2 at the ground potential. (short C1
and C2 to ground, C4 and C5 are eliminated from
detector circuit)
The capacitance across the bridge arms e.g. C6
cannot be eliminated by Wagner ground.
Wagner ground
Stray across arm
Cannot eliminate
C4
C5
C6
15
Analog Signal Conditioning
AC Bridges
Wagner Ground