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 […]
What is Maxwell’s Bridge? Circuit Diagram, Derivation & Advantages Read More »
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.
The deflecting torque causes the pointer to deflect from zero position and it may attain any position on the scale. But it is desired that the proportional to the quantity attain any position deflection should to be measured. So controlling torque is essential.
What is Controlling Torque? Methods, Diagram & Formula Read More »
The eddy current tachometer converts the angular speed (ω) of the rotor into pointer deflection ϕ. The diagram of the eddy current type tachometer is shown in figure 1. The eddy current tachometer is also referred as drag-up tachometer.
What is Eddy Current Tachometer? Working Principle, Diagram, Construction & Applications Read More »
Earth Tester generally used for measurement of earth resistance. Figure 1: Earth Tester.
What is Earth Tester? Working Principle, Construction, Diagram & Measurement Procedure Read More »