AC BRIDGE
· Function
-Alternating current bridges are used to measure inductance and capacitance
· Design
-Based on wheatstone bridge
· Feature
-Consists of four impedances, an ac voltage and detector
· Detector
-Detector can be a pair of headphone, Lissajous figure and electronics galvanometer
· Balance
-When Bridge is balance: Z1/Z3=Z2/Z4
Maxwell’s Bridge
Measure unknown inductance for low Q factor coils (Q:1-10)
Hay’s Bridge
Measure unknown inductance for high Q factor coils (Q:>10)
Schering’s Bridge
Measure small capacitors with low voltage
Wien’s Bridge
Measure frequency
Measure capacitance
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