Current transformer and Potential transformer are the types of instrument transformer. An instrument transformer is a special type of transformer that is used in the measurement of high voltage and high current, not allowing measuring instruments to come in direct contact with high voltage circuits. Potential transformer is also known as voltage transformer. In this … Read more
Maxwell inductance bridge is an AC bridge used for measurement of inductance of a coil by comparison with a variable standard self-inductance. Maxwell inductance bridge is shown in figure 1 under balance condition. Under balance condition, the current (Id) through the detector is zero. Hence current through arm ab and arm cd is the same. … Read more
AC Bridges are those circuits which are used for the measurement of unknown resistances, capacitance, inductance, frequency and mutual inductance. AC bridges operate with only an AC source. These bridges are very convenient and give the accurate result of the measurement. The construction of these bridge is very simple. Figure 1 shows an AC bridge. … Read more
Ionization type Vacuum gauge is a device which is used for the measurement of pressure in vacuum systems or in the very low-pressure region (below atmospheric pressure). It can measure pressure from 10-3 to 10-8 mm of Hg. Figure 1 shows the ionization type vacuum gauge. The gauge consists of 3 electrodes i.e. cathode (heating filament), grid and … Read more
Thermocouple Vacuum gauge is a device that is used for the measurement of pressure in vacuum systems or in the very low-pressure region (below atmospheric pressure). The working of this gauge depends upon the variation of thermal conductivity of a gas with pressure. The ability of a material to carry heat by conduction is called … Read more
Pirani gauge is a device which is used for the measurement of pressure in vacuum systems or in very low-pressure ranges from 10-1 to 10-3 mm of Hg. The working of this gauge depends upon the variation of thermal conductivity of a gas with pressure. The ability of a material to carry heat by conduction … Read more
Q-meter is an instrument designed for measuring Quality factor (Q) of a coil as well as for the measurement of inductance, capacitance, and resistance of an electric circuit at radio-frequency. Q-meter is also known as RLC meter. What is Quality factor of the coil? The ratio of the inductive reactance to the effective resistance of … Read more
In this article, we’ll learn voltmeter-ammeter method for the measurement of the medium resistances. As the name of the method suggests, we are having ammeter and voltmeter in this method to measure the resistance of the resistor. There are two possible connections while measuring the medium resistances by this method. We’ll discuss both the connections … Read more
Schering bridge is an AC bridge which is used for the measurement of unknown capacitance. This is one of the most commonly used AC bridge. Schering bridge is shown in figure 1 under balance condition. Introduction From figure 1, there are four arms as arm 1 = ab arm 2 = ad arm 3 = … Read more
Owen’s bridge is an AC bridge used for measurement of inductance of a coil in terms of capacitance. It is used for low Q-coils. Owen’s bridge is shown in figure 1 under balance condition. From figure 1, there are four arms as arm 1 = ab arm 2 = ad arm 3 = bc arm … Read more
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