Control Laboratory experiment for B.Tech. Electrical/ Electronics Engineering Control, Instrumentation and Measurement Laboratory
A.C. Position Control
We offer A.C. Position Control System usefull in control laboratory experiment. 2-phase ac servomotors have been traditionally used for position/ speed control applications especially in light weight, precision instrumentation area in airborne systems. The present unit is designed around a 12V ac servomotor and exposes the basic characteristics and dynamics of a position control system. A block diagram of the system is shown in figure below. Besides introducing the basic features like balanced modulation of the error signal, phase reversal around the set point and phase difference between the reference and control phases of the motor, the experiment involves study of the step response of the closed loop system. Being a mechanical system the response is too slow for a comfortable viewing on a CRO, except on an expensive storage oscilloscope. A microprocessor based waveform capture/ display card in the unit stores the step response in real time and displays the same once steady state is reached.
Highlights of Equipment:
2-phase A.C. Servomotor
Servo Potentiometer for position sensing
Transient response capture/display
In-built rms voltmeter on panel
Experiments:
Error detector characteristics, phase reversal
Amplifier gain measurement
Phase difference between control and reference windings
We offer A.C. Servomotor Study usefull for control laboratory experiments. Two phase a.c. servomotor is one of the very important electromechanical actuators having applications in the area of control systems. The study of its operating principle and features form a part of the first course on automatic control systems in electrical engineering curriculum. It's small size, low inertia and almost noise and frictionless operation makes the a.c. servomotor particularly attractive in aircraft and spacecraft applications. The characteristics of an a.c. motor is usually non-linear. To simplify the analysis a linearized model is developed. The experimental work revolves around determination of the parameters of the motor and thus its transfer function. Important subsystems of the unit includes, (a) an integrated speed sensor with 4-digit display in r.p.m. (b) an electrical loading system to compute torque (c) a time-constant measurement circuit with 3-digit display in milli seconds (d) a three step a.c. source with built-in r.m.s. voltmeter, and (e) a digital voltmeter on the panel for load measurement The unit has been designed such that expensive equipment like storage CRO is not needed. Also the hassle of direct torque measurement using spring balance etc. is avoided by linearization of the motor characteristics analytically. Highlights of Equipment
Torque computation through electrical loading
Determination of motor para-meters - inertia and friction
We offer Compensation Design useful for control labs. Practical feedback control systems are often required to satisfy design specifications in the transient as well as steady state regions. Cascade compensation is most commonly used for this purpose. This unit has been designed to enable the students to go through the complete design procedure and finally verify the performance improvements provided by compensation. The experimental set-up is accompanied by the supporting literature which becomes of vital importance as a major part of the experiment involves theoretical design of compensation networks. >>Highlights
Design and test cascade compensator
Simulated system for accurate results
Built-in compensator – only passive external components
Built-in signal sources
>>Experiments
Lag/Lead compensation in the frequency domain
Lag/Lead compensation in the s-plane
All the above design problems may be undertaken for a very wide range of design specifications
The implementation of the compensation network has been made very convenient by a pre wired amplifier with calibrated gain
>>Features and Specifications
Simulated ‘uncompensated’ system having adjustable damping. Peak percent overshoot MP, variable from 20% to 50%, and steady state error variables from 50% to 0.5%
Compensation network implementation through built-in variable gain amplifier. Gain is adjustable from 1 to 11
Built-in square and sine wave generators for transient and frequency response studies. Frequency adjustable from 25Hz – 800Hz (approx.)
Essential accessory: a CRO
The experiment is complete in all respect, except a CRO.
We offer D.C. Motor Study usefull in control laboratory experiment. A d.c. motor is commonly used as an actuator in many industrial control applications because of its features – large torque and ease of speed variation. The dynamic characteristics of such a system therefore depends on the motor parameters, viz., moment of inertia, coefficient of friction, time constant and also the resistance and inductance of the control winding. It is therefore important to experimentally determine the mechanical and electrical parameters of the d.c. motor and also to evaluate its transfer function. The present unit is designed to study a small permanent magnet d.c. motor. A still smaller generator directly coupled to the motor is used for the dual purposes of speed signal pick up and providing electrical loading. The shaft speed in rpm is displayed automatically on a 4-digit panel meter. When the motor is suddenly switched ON, a novel circuit computes and displays the time constant in milliseconds on a 3-digit panel meter. This avoids the need for an expensive storage CRO. The motor unit is housed in a cabinet with transparent panels, providing a good view of the mechanical system.
Highlights of Equipment:
Torque-speed characteristics
Determination of motor parameters - inertia and friction
Digital display of time constant
Transfer function evaluation
Experiments:
Determination of torque-speed characteristics
Evaluation of inertia and friction parameters
Determination of back e.m.f. constant
Determination of time constant
Determination of transfer functions of the Motor and the Generator
Features and Specifications
Study of a 12V, 8W d.c. motor
Small generator (2W) for speed pick up and loading
4-digit speed display
3-digit time constant display
3½ digit voltmeter and current meter for d.c. measurement
We offer D. C. Position Control System usefull in control laboratory experiment. This unit provides the students an opportunity to study and operate a practical electro-mechanical angular-position-control system. The system is built around a good quality permanent magnet armature controlled d.c. motor, speed reduction gear-set, potentiometric error detector using special 360° revolution servo potentiometers, a tachogenerator for velocity feedback and associated electronic circuits. The motor unit is housed in a separate cabinet with transparent panels for easy viewing. Interconnection with the main unit is through a standard 9-pin D-type connector. Experimental work on this system would enable the students to appreciate the difference in performance between idealized systems studied in the theory classes and the systems encountered in practice.
Highlights of Equipment:
Compact system - no mechanical hassles
Simplified operation
μP based storage of response
Positive/Negative tachogenerator feedback
Experiments:
Operation of the position control system for different values of the forward gain to angular position commands
Step response studies for various values of forward gain
Study of the effect of velocity feedback on the transient and steady state performance of the system as well as its stability
Features and Specifications:
Position control of a 12V, 1A d.c. gear motor (50 rpm)
Provision for positive and negative tachogenerator feedback
Tacho constant: 2V/1000 rpm approximately
Calibrated dials for reference and output position: resolution 1°
Servo-potentiometers with full 360° rotation
μP based waveform capture/display card
Built-in 3½ digit DVM for signal measurements
Built-in step signal and IC regulated power supplies for electronic circuits
Separate unit for motor in a see-through cabinet
220V±10%, 50Hz mains operation
Literature and patch cords included
Essential accessories - a CRO
The experiment is complete in all respect, except a CRO.
We offer D.C. Speed Control system usefull in control laboratory experiment. The present unit, built around a small permanent magnet d.c. motor, is designed to bring out the salient features of such a system. Facilities are available to directly measure the principal performance features of the speed control system, viz., steady state error and load disturbance rejection, as a function of the forward path gain. In addition, the experimental work involves the determination of the motor transfer function and the characteristics of the tachogenerator. An important feature of the unit is the built-in absolute speed measurement through optical pick-up from a slotted disk followed by a frequency counter. Variable loading of the motor is achieved by a built-in eddy current brake.
Highlights of Equipment:
Closed loop motor speed control with eddy current brake
Compact system-no mechanical hassles
Opto electronic speed sensor
Digital display of speed on the panel
Experiments:
Effect of loading on the speed of the motor in the open loop
Steady state error variation with forward gain
System time constant variation with forward gain
Effect of forward gain on disturbance rejection
Determination of the motor transfer function and tachometer characteristics
Features and Specifications
Speed control of a 12V, 4W permanent magnet d.c. motor
Speed range: 0 to 3000 rpm (typical)
Opto-interrupter based speed sensing
4-digit speed display in rpm
Electronic tachogenerator for feedback
Separate unit for motor in a see-through cabinet
Smooth, non-contact eddy current brake for loading
Built-in 3½ digit DVM for signal measurements
Built-in IC regulated internal power supply
110V±10%, 60Hz mains operation
Supporting literature and patch cords included
Essential accessory – a CRO
The experiment is complete in all respect, except a CRO.
Introduction We offer D.C. Speed Control System, DCS-201 usefull for control laboratory. Closed loop speed control of dc motor is a common experiment for studying various features of automatic control systems like control, regulation and disturbance rejection. The present unit is designed to demonstrate the working of PWM and SCR based controllers and show the resulting waveforms of the voltage supplied to the motor. Measurement of the timings on the waveforms under various conditions has been suggested to get a good insight into the operation of the system. The experiment is complete with all the sub-systems and a detailed operating literature is included which introduces the basic theory, suggested experiments and an interpretation of the results. An external CRO is all that is needed to view the waveforms and measure the timings.
Highlights
PWM Power Control
SCR Power Control
CRO Display of Waveforms
4-Digit Speed Display in rpm
Contactless Eddy Current Braking
Experiments
Open loop speed control for PWM Controller, with and without load
Open loop speed control for SCR Controller, with and without load
Closed loop speed control for PWM Controller with load
Closed loop speed control for SCR Controller with load
Observation and measurements on the voltage waveforms
Features and Specifications
Speed control of a 12V, 4W permanent magnet d.c. motor
Speed range: 0 to 2000 rpm (typical)
Opto-interrupter based speed sensing
4-digit speed display in rpm
Electronic tachogenerator for feedback
Separate unit for motor in a see-through cabinet
Smooth, non-contact eddy current brake
220V±10%, 50Hz mains operation
Supporting literature and patch cords included
Essential accessory – a CRO
The experiment is complete in all respect except a CRO.
We offer Digital Control System usefull for control laboratory experiment. In the present unit a second order transfer function, simulated with operational amplifiers and passive components, has been chosen as the process to be controlled. This results in a well behaved and near perfect linear process which gives a highly predictable performance. The digital controller consists of a 8085 based microprocessor kit with analog-to-digital and digital-to-analog interface. Software supplied with the system resides in a 8K EPROM. This consists of P, PI and PID algorithms in which the three gains may be selected out of 16 levels each. Further, the user may write his own programs to implement additional algorithms and study their responses.
Highlights of the equipment:
Digital Controller implementation on mP-kit
Simple Op-amp based analog plant
CRO display of response
Design and test new algorithms
Experiment:
Identification of the controlled process
Study of sampling period variation
Designing P, PI, PD and PID controllers
Advanced algorithms implementation
Features and Specifications:
Second order simulated process (analog process)
Built-in D/A and A/D circuits (8-bit)
8085 based mP kit as digital controller with user software in 8K EPROM
16-bit arithmetic for algorithmic calculations.
Square wave test input (internal)
16 built-in levels of P, I and D gains each.
Complete flexibility for the user to develop own software
We offer Light Intensity Control System useful for control labs. The light intensity control system is designed to bring out the basic features of closed loop systems in the form of a laboratory experiment. The light panel comprises of a number of filament lamps which get power from amplifier. Average intensity of the panel is sensed by a light sensor and a suitable voltage level is produced. Error detector, reference input and error amplifier are of standard configurations found in any linear control system. In addition to the above, the light panel also contains a few uncontrolled lamps which may be used as disturbance source. Further a square wave signal is available for dynamic response studies. Highlights
Feedback control of light intensity
Study of inherent non-linearties-sensor, lamps
PI control
Dynamic response displays
>>Experiments
Characterization of light panel and light sensor blocks
Study of a practical single loop feedback control system which includes:
• Disturbance study • Error monitoring
Performance improvement through P-I control
Evaluation of dynamic behavior
>>Features and Specifications
Built-in 3½ digit DVM
Built-in IC regulated power supplies
Literature and patch cords included
Seven lamps 6V/300mA
5Hz square wave and triangular wave for dynamic response study
We offer Linear System Simulator useful for control labs. The set-up offered is a variable configuration simulated system designed for time domain studies of both open loop and closed loop systems. Selection at block diagram level eliminates the need to bother about the details of electronic circuitry and its assembly. The simulator shown includes transfer functions of the form 1/s and 1/(sT+1), a calibrated variable gain K and an error detector.
>>Highlights
Time domain study of a Linear System
Op-amp simulated system for greater accuracy
Flexible systems configuration
Additional experiments may be performed
>>Experiments
Open and closed loop step response of First Order type-0 system for various values of gain
Open and closed loop step response of Second Order type-0 and type-1 systems
Response of third order system
Steady-State errors for closed loop configuration through triangular wave input.
The number of experiments possible on the unit is not limited to those suggested above.
>>Features and Specifications
Simulated first, second and third order system of type-0 and type-1
Calibrated variable gain amplifier (Resolution 1:1000)
Built-in signal sources:
Square wave and Triangular Frequency: 45-90Hz Amplitude: 0-2.5V approximately
Trigger output for perfectly steady display on CRO
We offer Linear Variable Differential Transformer useful for control labs. The present experimental unit comprises of a LVDT in a transparent box with lead screw based slow motion displacement, a mm scale for displacement measurement, and main unit consisting of excitation signal source, balanced demodulator, a 3½ digit DVM and necessary power supplies. The signals are provided to the LVDT box through a cable from the main unit. >>Highlights
Large size LVDT for classroom experiment
Transparent casing for proper viewing
AC and DC output
Slow motion displacement
>>Experiments
Variation of modulated output with displacement
Input-Output characteristics
Determination of linear range and transducer gain
>>Features and Specifications
LVDT
Range: ±50mm or total 100mm Sensitivity: 25mV/cm Operating frequency: 5KHz±5%
Displacement measurement on a mm scale with fine motion control
We offer Microprocessor Device Controller use full for control labs. This unit has been designed to train the students to handle basic input - output operations of the 8085 microprocessor through 8255 ports. The power supply, drivers and other hardware are pre-wired resulting in a greater reliability of operation. The students are expected to enter a few suggested programs and also to develop their own programs for a variety of input-output operations. Highlights
Sequence control of 8 LEDs through 8255 port
Control of 2 relays
Operating a 7-segment display
Switch state input through 8255 port
SID/SOD Operation
Experiments
Light the 8 LEDs in a cycle, in binary sequence, as a bar graph display etc.
Operate the 2 relays with software controlled timing
Operate the 7-segment display through segment control
Sense the state of the 4-switches as input and send out suitable signals to various output devices
Study of SID/SOD commands
Features and Specifications
System comprises of a main unit and a mp kit
The main unit houses all the I/O devices, viz. LED’s, relays, 7-segment display, switches and their drivers/interfacing circuits
The status of the relays and switches are displayed with the help of lamps mounted on the panel
We offer PID Controller, PID-01 useful for control labs. The experimental unit consists of simulated building blocks like error detector, dead time, integrator and time constants, which may be configured into a variety of systems. A PID section with adjustable proportional gain, derivative and integral time constants provide the control action. Built-in set value, square and triangular sources enable the students to study the response on a CRO. The literature includes system description, theory, experimental procedure and typical results. An important feature of the system is that the simulated blocks are designed to operate at frequencies suitable for CRO viewing. Highlights
PID-action study on CRO
Simulated blocks for flexible system
Time delay (transportation lag) block
Synchronised square and triangular source for flicker free display
Experiments
Open loop response of various process configurations (10 in all)
Study of closed loop response for above
P, PI, PD and PID design and performance evaluation in each case
Features and Specifications >>Simulated blocks – dead time (transportation lag), integrator, time constants, error detector and gain >>PID Controller (configurable as P, PI, PD or PID) Prop. Band: 5% to 50% (Gain 2-20) Integral time: 10msec - 100msec Derivative time: 2-20msec >>Built-in signal sources Set value: -1V to +1V Square wave: 1V p-p (min.) at 40Hz (typical) Triangular wave: 1V p-p (min.) at 40Hz (typical) >>Built-in 3½ digit DVM for d.c. measurements >>Built-in IC regulated power supply >>Detailed literature and patch chords included >>Essential accessory – a CRO
We offer Potentiometric Error Detector useful for control labs. All feedback control systems operate from the error signal which is generated by a comparison of the reference and the output. Error detectors perform the crucial task of comparing the reference and output signals. The present set-up is designed to study the important characteristics of a 2-potentiometer angular position error detector. These include (i) linearity, (ii) sensitivity and (iii) maximum angle of rotation. Good quality wire wound servo potentiometers with full 360° rotation have been used for this purpose. Accurately marked dials with least count of 1° are fixed on the shafts for position indication. The error voltage is read on a built-in 3½ digit DVM. An I.C. regulated internal reference voltage is available for d.c. studies. When used with an a.c. reference, the unit also demonstrates the phase reversal of the error signal which is important in applications involving a 2-phase servomotor as actuator. Highlights
High quality servo potentiometers
360° Mechanical, 355° Electrical span
DC and AC operation
3½ Digital Panel Meter for all measurements
>>Experiments
Linearity study of the error detector
Determination of error detector gain
Use of a.c. supply for the error detector-introduction to the phase reversal of error signal
>>Features and Specifications
High quality servo-potentiometers of 360° shaft rotation
Requires an external CRO for a.c. studies
Built-in signal and power sources
3½ digit DVM for measurements
The experiment is complete in all respect, except a CRO.
We offer Relay Control System use full for control labs. In the present unit a simulated second order system is controlled by an electronic relay. Apart from a study of the relay characteristics the experiment introduces the concept of Describing Function. Finally the phase plane method of analysis is covered in detail where the switching trajectories can be displayed on an X-Y oscilloscope. >>Highlights
System with electronic relay
Adjustable hysteresis and dead zone
Display phase plane diagram on CRO
Stability study by describing function method
>>Experiments
Study of the relay characteristics and display of the same on CRO for different values of hysteresis and dead zones.
Study of the effect of hysteresis on system stability. Graphical analysis to predict sustained oscillations.
Phase plane analysis of relay control system for various values of Hysteresis and Dead Zones. View the trajectory for different hysteresis and dead zone.
>>Features and Specifications
Simulated electronic relay using high speed IC’s
Simulated 2nd order linear plant. Facility for displaying x and x. signals
We offer Stroboscope usefull for control labs. Measurement of the speed of a rotating shaft is a common requirement in many industrial and laboratory applications. Stroboscope, is a convenient-to-use, direct reading speed measuring instrument. A highly stable function generator IC based circuit provides the basic variable frequency timing pulses. These are read on an IC based LCD/LED counters with direct speed display in rpm. The flasher unit generates the high intensity flashes at a suitably scaled rate directed towards the rotating shaft. Precision potentiometer's makes the task of speed setting very precise. The portable model, fitted into a light weight and strong plastic body is more suited for industrial / class room environment. Operating instructions are included in the Instruction manual accompanying the unit. Highlights Non-contact speed measurement High intensity flashes Direct speed reading in RPM No shaft modification Features and Specifications Speed range: 500-9900 rpm Crystal Controlled accuracy Mains Operation Display: 4 digit LED Freq. control: 10 turn Potentiometer Study Desktop Model Suitable for class room environment The experiment is complete in all respect.
We offer Study of Digital-to-Analog Converter, DTA-01 useful for control labs. Measurement of the speed of a rotating shaft is a common requirement in many industrial and laboratory applications. Stroboscope, is a convenient-to-use, direct reading speed measuring instrument. A highly stable function generator IC based circuit provides the basic variable frequency timing pulses. These are read on an IC based LCD/LED counters with direct speed display in rpm. The flasher unit generates the high intensity flashes at a suitably scaled rate directed towards the rotating shaft. Precision potentiometer's makes the task of speed setting very precise. The portable model, fitted into a light weight and strong plastic body is more suited for industrial / class room environment. >> Highlights:-
Basic 4-bit weighted resistance
4-bit R-2R network module
10-bit IC Type AD7533 with mechanical switches
Microprocessor interfaced 10-bit converter
>> Experiments:-
Study of the circuit diagram and performance of a 4-bit weighted resistance type D/A converter. The digital inputs are to be given by operating four mechanical switches.
The above experiment is conducted on a 4-bit discrete component R-2R network based unit.
Manual operation of a 10-bit IC D/A converter type AD7533 through 10 mechanical switches.
Operation of the IC based circuit through the microprocessor kit provided. Some typical waveform generation exercises are suggested and solutions are provided. More problems can be attempted by the student with help from his supervisor.
We offer Study of Magnetic Levitation System useful for control labs. Magnetic Levitation, lifting of objects under the influence of a magnetic field, has numerous application including some advance locomotives designed on the repulsive force of a magnet. The present unit, based on the attractive force of an electromagnet, is inherently unstable. There is no way to keep an iron object suspended in air by manually adjusting the current in the electromagnet. Even a feedback control with forward path gain control alone is ineffective. These facts are brought out by studying and experimenting with the dynamics of the system. The next task consists of the design of suitable controller and implementing the same to achieve the desired objective. A sound knowledge of MATLAB and its availability should be highly desirable, though not essential, for the conduct of this experiment. The basic theory, analysis and sample calculation are described in the accompanying literature.
>>Highlights
Object suspended in air by magnetic force – excellent visual impact
Controller design to maintain stability
Up-down position setting by reference control
>>Experiments
To develop the transfer function of the system through laboratory
To design/implement PD and lead compensation with different parameter
To simulate the system in MATLAB and study in detail various control option and their response
We offer Study of Second Order Networks useful for control labs. Second order networks are important because of the fact that these are the simplest networks that produce the complete range of transient response – from over damping to near oscillations. Although theoretical discussions are normally confined to passive RLC networks, such networks are limited in their performance due to the rather large resistance of any reasonable value inductance that might be constructed to operate at frequencies of few kHz. In the present unit active RC-network has been designed which span the complete behavior of an equivalent passive RLC network. The user thus has the experience of studying a near ideal passive second order network complete with all theoretical computations and their experimental verifications.
>>Highlights
Active second order network
Damping control–over-, critical-, and under-damping
Built-in sine wave signal
Needs an external CRO for response study
Operates with 220V/50 Hz
Detailed technical literature and experiment results supplied
>>Experiments
Observe and trace from the CRO screen the step response for different values of ζ.
Compute approximate values of equivalent network parameters.
Plot the frequency response for various of ζ and observe resonance
>>Features and Specifications
Active RLC network using 3-Op Amps
Damping 1.1-0.1 (approx)
Square Wave 35-700 Hz., 0-1V (typical)
Sine Wave 35-700 Hz., 0-1V (typical)
Essential accessory: a CRO
The experiment is complete in all respect, except a CRO.
We offer Study of Stepper Motor useful for control labs. This experimental set-up aims at providing an exposure to the basic operation of a stepper motor, its drive and logic, and limitations as far as the internal dynamics is concerned.
>>Highlights
Stepper motor operation through pulse circuit
Stepper motor operation through 8085 mp kit
Built-in programs in EPROM
Dynamic response study
>>Experiments
Manual stepping through push button switch. Measurement of step angle.
Speed and direction control logic by recording the pulse sequence.
Study of resonance effect at various speeds
Display and measurement of the dynamic characteristics of the motor in the wobble mode.
Calculation of ‘single stepping’ and ‘slew’ regions.
Programming the microprocessor kit to implement features like direction, speed, angle of rotation, number of steps or an arbitrary motion
Study of the effect of inertial and frictional loading on the dynamic performance
>>Features and Specifications
Single stepping and free running modes of operation with speed variation and direction reversal - internal TTL circuit.
360° motion Servo-Potentiometer position -pickup for motor dynamics
Operation through microprocessor kit – sample control programs provided
We offer Study of Synchro Devices useful for control labs.
>>Highlights
Synchro transmitter-receiver pair with calibrated dials
Locking system for receiver rotor
Receiver use as control transformer
Built-in balanced demodulator circuit
Panel meter for ac/dc voltages
All internal power from the 220 V/50 Hz mains
Only an external CRO required
>>Introduction
Basic characteristics study - stator voltages as a function of the rotor angle using the built-in ac voltmeter. This shows the space variation of the three voltages, VS1S2, VS2S3, and VS3S1, causing rotation of the resultant magnetization in the stator which is fundamental to the error detection process.
Operation and error study of the transmitter-receiver pair as a simple open loop position control at a very low torque. This is a rarely used application but is used to demonstrate the direction of the resultant magnetic field in the receiver.
Plotting the error voltage output as a function of the transmitter rotor angle with the receiver rotor locked. Observing the 180° phase reversal around the zero error is significant as this the basic method through which the direction of the error is detected in an ac system
Use of balanced demodulator to develop dc error signal with appropriate polarity and compare it with the ac error. This block would be needed if a mixed system were to be designed using both dc and ac components.
The experiment is complete in all respect except a CRO.
We offer Study of Temperature Transducers, STT-01usefull for control labs. Measurement of temperature is an important task in a large number of physical processes. A transducer in a device which converts the temperature information into an electrical signal usually voltage, for an automated processing. A very wide variety of temperature transducers are commonly available which differ from each other with regards to there: (a) Range of operation (b) Sensitivity and linearity (c) Accuracy, Stability and Repeatability (d) Speed of response The present experiments has been designed to study the input-output characteristics of some common transducers like, thermistors (PTC and NTC), thermocouple, semiconductor sensors and may be extended to also study the temperature coefficients of resistance. >> Highlights:-
Temperature controlled oven with digital display
Instrumentation amplifier with gain switching
Digital voltmeter
Interfacing circuits for common transducers
>> Experiments:-
Temperature-output voltage characteristics of the following transducers in the temperature range of room temperature to 150°C and determination of their parameters
Thermocouple
- Chromel - Alumel - Copper - Constantan
Thermistors
Semiconductor sensor (type AD590) upto 90°C only
>> Features and Specifications:-
Temperature controlled oven upto 150°C with digital temperature display
Digital voltmeter on the panel for sensor output measurement
Built-in interfacing circuit and switched gain instrumentation amplifier
We offer Temperature Control System use full for control labs. This experiment has been designed to expose the students to a practical control system, its various stages for control, and the tuning of a PID controller. The process consists of a small and fast responding oven which can be controlled in the temperature range from ambient to about 90°C. Temperature readings may be taken manually on a 3½ digit meter, mounted on the main unit, at regular intervals. The oven is connected to the main unit through a four pin connector, two for the sensor input and the others for controller output to the heater. >> Highlights:-
Fast compact oven upto 90°C
Forced cooling option
Variety of control actions
Digital temperature readout
Built-in timer, 0-9999 sec.
Solid state temperature sensor
>> Experiments:-
Identification of the oven parameters
Study of ON-OFF temperature control (with adjustable relay characteristics)
Study of P, PI, PD and PID controls having adjustable coefficients
>> Features and Specifications:-
Temperature controller with facilities for P, I, D and relay control blocks
Operating temperature: Ambient to 90°C
Separate controls for P, I, D channel gains
Two settings for relay hysteresis
Fast 25W oven fitted with IC temperature sensor
Forced cooling option to ready oven for next experiment
Digital display of set and measured temperature on a 3½ digit built-in DVM
Buffered output for recorder
IC regulation in controller circuit power supplies
Ultra Electric Company India Private Limited Supplier of Control Equipments which includes control panels, electrical control panels, mcc panels, mcc control panels, electrical mcc panels, capacitor panels, capacitor control panels and electrical capacitor panel.
B. Sheth & Sons Exporting and supplying servo motors such as abrasion resistant servo motors, corrosion resistant servo motors, compact servo motors, commercial servo motors and industrial servo motors.
Protocontrol Instruments India Pvt. Ltd. Engaged in supplying and manufacturing of control equipment such as calibration equipment, digital temperature controller, electric timer and temperature transmitters.
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