1. Hey Bridge & Schering Bridge
SR NO.
NAME OF GROUP MAMBERS
ENROLL NO. 1
PATIL PARITA 2
PRAJAPATI RAHUL 3
PRAJAPATI VISHAL

2. Hey Bridge
The Hey’s bridge is a modification over the Maxwell’s bridge
The Hay circuit is more convenient for measuring high-Q inductors especially those having a Q >10

3. Phasor diagram of arm 4&1

4. We know the condition for the bridge balance point :

5. Using above equations..
Unknown resistence & inductance, can be calculated.. The Q value is,
Q = 1/ωC4r4

6. Advantages & Disadvantages of Hay's Bridge
ADVANTAGE:- The bridge gives very simple expression for the calculation of unknown inductor of high value. The Hay's bridge require low value of r4 while Maxwell bridge requires high value of r4.
DISADVANTAGE:-Hay's bridge is not suitable for measurement of quality factor (Q<10) for Q<10 we should use Maxwell bridge.

7. Schering Bridge It’s uesd extensively for the mesurement of capacitors
It’s also used for mesuring insulating properties that is for phase angles of very nearly 90o
Commercial schering bridge measures capacitors from 100pF - 1µF with ± 2 % accuracy

8. Phaser diagram of bridge
The bridge is widely used for testing small capacitors at low voltage with high precision

9. Substituting,

10. Power factor :- it is defined as the cosine of phase angle of ckt
For phase angle cos 90°, reactance is equal to impidance

11. Dissipation factor :- It’s define as cotangent of the phase angle
For Schering Bridge, Rx is a fixed value, the dial of Cx can be calibrated directly in D at one particular frequency

12. Thank u!