Electrical Instruments

What is Bourdon Tube Pressure Gauge? Working, Diagram, Construction & Advantages

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Figure 1: Bourdon Tube Pressure Gauge. Working and Construction of Bourdon Tube Pressure Gauge The Bourdon tube is the most frequently used pressure gauge because of its simplicity and rugged construction. It covers ranges from 0-15 psig to 0-100,000 psig, as well as vacua from 0 to 30 inches of mercury. It consists of a […]

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What is Maxwell’s Bridge? Circuit Diagram, Derivation & Advantages

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Maxwell’s Bridge method is used for measuring an unknown inductances of low Q values. It measures unknown inductance in terms of known capacitance.  The circuit of Maxwell’s bridge is shown in Fig. 1. One arm of the bridge has resistor R1 in parallel with capacitor C1. The unknown inductor Lx with series resistor Rx is

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What is Permanent Magnet Moving Coil (PMMC) Instrument? Working Principle, Diagram, Construction, Parts and Derivation

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Figure 1: PMMC Instrument. Working Principle of PMMC Instrument When a current carrying conductor is placed in a magnetic field the force is produced on the conductor (coil). This force tends to move the coil in the space. Construction of PMMC Instrument Fig. 1 shows constructional details of PMMC instruments with different constructions of permanent

What is Permanent Magnet Moving Coil (PMMC) Instrument? Working Principle, Diagram, Construction, Parts and Derivation Read More »