## Heaviside Bridge Circuit

Before we introduce this bridge let us know more about the uses of mutual inductor in bridge circuits. Now one question must arise in our mind that why we are so much interested in mutual inductance, answer to this question is very simple we will use this mutual inductor in Heaviside bridge circuit. We use … Read more

## De Sauty Bridge

This bridge provide us the most suitable method for comparing the two values of capacitor if we neglect dielectric losses in the bridge circuit. The circuit of De Sauty’s bridge is shown below. Battery is applied between terminals marked as 1 and 4. The arm 1-2 consists of capacitor c1 (whose value is unknown) which … Read more

## Blavier Test | Murray Loop Test | Varley Loop Test | Fisher Loop Test

Blavier’s Test is used to find the earth fault location in an underground cable. The two ends faulty cable are mentioned as sending end and far end respectively as shown in fig 1. In this test, the sending end of the cable must be open and isolated and the resistance between sending end and earth … Read more

## Wheatstone Bridge Circuit Theory and Principle

Wheatstone Bridge For measuring accurately any electrical resistance Wheatstone bridge is widely used. There are two known resistors, one variable resistor and one unknown resistor connected in bridge form as shown below. By adjusting the variable resistor the current through the Galvanometer is made zero. When the current through the galvanometer becomes zero, the ratio … Read more

## Kelvin Bridge Circuit | Kelvin Double Bridge

Before we introduce Kelvin Bridge, it is very essential to know what is the need of this bridge, though we have Wheatstone bridge which is capable of measuring electrical resistance accurately (usually an accuracy of around 0.1%). To understand the need of Kelvin bridge we must first recognize 3 important ways to categorize electrical resistance: … Read more

Anderson’s Bridge Let us understand why there is need of Anderson’s bridge though we have Maxwell bridge and Hay’s bridge to measure quality factor of the circuit. The main disadvantage of using Hay’s bridge and Maxwell bridge is that, they are unsuitable of measuring the low quality factor. However Hay’s bridge and Maxwell bridge are … Read more

## Maxwell Bridge Inductance Capacitance Bridge

This bridge is used to find out the self inductor and the quality factor of the circuit. As it is based on the bridge method (i.e. works on the principle of null deflection method), it gives very accurate results. Maxwell bridge is an AC bridge so before going in further detail let us know more … Read more

## Hay′s Bridge Circuit Theory Phasor Diagram Advantages Applications

Hay’s Bridge Applications Before we introduce Hay’s bridge let us recall the limitations of Maxwell bridge, in order to understand what is the necessity of Hay’s Bridge Applications. Maxwell bridge is only suitable for measuring medium quality factor coils however it is not suitable for measuring high quality factor (Q > 10). In order to … Read more

## Owens Bridge Circuit and Advantages

We have various bridges to measure inductor and thus quality factor, like Hay’s bridge is highly suitable for the measurement of quality factor greater than 10, Maxwell’s bridge is highly suitable for measuring medium quality factor ranging from 1 to 10 and Anderson bridge can be successfully used to measure inductor ranging from few micro … Read more

## Schering Bridge Measurement of Capacitance using Schering Bridge

Schering Bridge Theory This bridge is used to measure to the capacitance of the capacitor, dissipation factor and measurement of relative permittivity. Let us consider the circuit of Schering bridge as shown below: Here, c1 is the unknown capacitance whose value is to be determined with series electrical resistance r1. c2 is a standard capacitor. … Read more