Wien Robinson's frequency Bridge

•Pick up four resistances,two capacitors, a ac voltage source and a detector from the toolbox.

•Connect the elements as shown in the figure to form a Wien Robinson's frequency Bridge.

•After making the circuit click on check circuit button to check the connections

•Select the ratio (R4/R3) from the dropdown available (default value is 2)

•Now enter the values of resistors and capacitors such that first equation of balancing is satisfied i.e. (R4/R3)=(R2/R1) +(C1/C2). Enter AC voltage source value and click on the submit button. A blanck value of digital meter indicates that first balancing condition is not met.

•After entrering all values digital meter shows deviation from the actual frequency value where a negative value shows that calculated frequency is lesser than the actual frequency while a positive value refers to larger calculated value and a zero value represents balanced bridge.

•In order to fix negative value of digital meter decrease the resistance and capacitance values keeping the initial ratio constant and for fixing a positive value increase the resistance and capacitance value satisfying the first balancing condition.

•Repeat the experiment until the bridge gets balanced.

•After balancing the bridge, unknown frequency will be automatically added to the observation table.

•Take atleast 5-7 readings at different value of inputs and calculate the average of all values.

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Observation Table
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Wien Robinson's frequency Bridge
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