Definition: The bolometer is a device used for detecting and measuring the heat and radiation of Microwave energy or RF. It uses the temperature sensitive resistive element who resistance changes with the temperature. The Thermistor and Barretter are the examples of the commonly used resistive element. The circuit of the bolometer is in the form …
Definition: The recording instrument is defined as the instrument which records the continuous variation of the magnitude of an electrical quantity for a particular period. It is used in a placed where the continuous reading of circuit conditions is required. The record is used for future reference or computational work. The recording instruments take readings …
Definition: The resolver is a rotary transformer used for conversion of the angular position of the shaft into Cartesian coordinates. It is an analogue device which has a digital counterpart. The output of the transducer has two signals, one is proportional to the sine of the angle and other is proportional to the cosine of …
Definition: The integrating instrument measures the total energy supplied by the circuit in a given interval of time. It is independent of the rate at which the total energy consumed. The watt hour meter is the example of integrating instruments. This type of meter directly measures the energy in watt hour. Types of Integrating Instruments …
Definition: The analogue instrument is defined as the instrument whose output is the continuous function of time, and they have a constant relation to the input. The physicals quantity like voltage, current, power and energy are measured through the analogue instruments. Most of the analogue instrument use pointer or dial for indicating the magnitude of the …
Definition: The capacitive transducer is used for measuring the displacement, pressure and other physical quantities. It is a passive transducer that means it requires external power for operation. The capacitive transducer works on the principle of variable capacitances. The capacitance of the capacitive transducer changes because of many reasons like overlapping of plates, change in …
Definition: The hall effect element is a type of transducer used for measuring the magnetic field by converting it into an emf. The direct measurement of the magnetic field is not possible. Thus the Hall Effect Transducer is used. The transducer converts the magnetic field into an electric quantity which is easily measured by the …
Definition: The transformer which senses the angular displacement of the conductor is known as the Rotary Variable Differential Transformer or RVDT. It is the type of electromechanical transducer which gives the linear output proportional to the input angular displacement. The circuit of RVDT is shown in the figure below. The working of the RVDT is …
Definition: The Linear Variable Inductive Transformer converts the linear displacement into an electrical signal. It works on the principle of mutual induction, i.e., the flux of the primary winding is induced to the secondary winding. The output of the transformer is obtained because of the difference of the secondary voltages, and hence it is called a differential …
Definition – The resistance thermometer or resistance temperature detector (RTD) uses the resistance of electrical conductor for measuring the temperature. The resistance of the conductor varies with the time. This property of the conductor is used for measuring the temperature. The main function of the RTD is to give a positive change in resistance with …
