The most important performance aspect of a practical system is its response to known input. A large part of the analysis of such systems is therefore devoted to time-domain studies. 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. Thus time and efforts could be directed towards understanding and experimenting with the basic aspects of linear control systems. Built-in square wave and triangular wave generators provide test inputs to study both transient and steady state response. Provision is also there to observe the effect of disturbances. Additionally, frequency response studies can be made using an external sine wave generator. An exhaustive literature is supplied with the unit to enable the students to understand and appreciate the intricasies and importance of time response studies of linear systems.


The main objective of this experiment is to study the characteristics of a.c. and d.c. servo motors. A.C. servo motors are basically two-phase reversible induction motors modified for servo operation. These servo motors are used in applications requiring rapid and accurate response characteristics. Hence they have small diameter, light weight, low inertia and high resistance rotors. The motors small diameter and low inertia provides for fast starts, stops and reversals. High resistance provides nearly linear torque-speed characteristics. D.C. motors are the most commonly used actuators in electro-mechanical control systems or servomechanisms. Compared to servo motors d.c. motors has the advantage of higher torque and simpler driving circuit. However the prescence of a commutator and a set of brushes with the problems of sparking make the d.c. motor less durable compared to servo motor.The most important assumption in this experiment is that of considering the system to be linear. However both the a.c. and d.c. generatorare are non-linear. However the transfer functions derived from the experiment represents the actual behaviour of the motor at least at low speeds.


The 37-100 Process Trainer is a self contained process and control equipment. It has the basic characteristics of a large plant, enabling distance/velocity lag, transfer lag, system response proportional and two step control to be demonstrated. Due to its relatively fast response, changes in set value can be displayed on an oscilloscope. In this experiment, air drawn from atmosphere by a centrifugal blower is driven past a heater grid and through a length of tubing to atmosphere again. The process consists of heating the air flowing in the tube to the desired temperature level and the purpose of the control equipment is to measure the air temperature, compare it with a value set by the operator and generate a control signal which determines the amount of electrical power supplied to a correcting element, in this case a heater mounted adjacent to the blower.


The MS 150 Modular Servo System is an unique equipment designed to study the theory and practise of automatic control systems. It has been designed for teaching the theory of open and closed loop, speed and position control systems using modular units, both mechanical and electronic, that can be configured to demonstrate the various methods of control techniques. The synchronous transmitter and transformer are used in more specialised and advanced control engineering courses where some detailed knowledge of AC carrier systems is required. This will have particular relevance to control engineering for military and aviation schools.


This teaching set introduces students to the principles of analog motor control, through a wide range of practical activities. This comprehensive teaching set includes a DC motor control module, command potentiometer, PID controller module, input/output interface module, and curriculum manual. A power supply unit and connection leads are also provided. It provides an exciting setup for experimentation in various fields such as: Transient and Steady State Response, Proportional Speed Control, Proportional Position Control, Second Order Response Parameters, Velocity and Transient Velocity Feedback, Controller Characteristics, Integral Speed Control, Proportional Plus Integral Speed Control, Proportional Plus Integral Plus Derivative, Position Control, Instability.


This kit is a rugged, self- contained panel trainer with a steel case and integral power supplies. It provides a range of transducer input and output devices together with associated instrumentation circuitry. The transducer and signal conditioning elements of this trainer are typical of those used throughout industry.These elements include:

Input devices:For the detection of rotary and linear position, temperature, light,pressure, strain, airflow, humidity and audible and Ultrasonic sound.

Output devices:For the generation of heat, light, rotary and linear actions, audible and ultrasonic sound and visual indication of voltage, time and number of events.

Instrumentation circuitry:For the investigation of Wheatstone Bridges and current measurement techniques, linear and non-linear signal amplification, closed and open loop control, one, two and three term (PID) control, DC restoration of AC signals, signal transmission techniques and alarm sensing.