Calibration
of Galvanometer
The calibration of the
galvanometer is the process of determining its constant value by the help of
the practical experiments. The following are
the methods used for determining the constant of the ballistic galvanometer.
Using
a Capacitor
The charging and discharging of the capacitor gives the values of the ballistic galvanometer constant. The circuit arrangement for the calibration of a ballistic galvanometer using the capacitor is shown in the figure below.
The circuit uses
two pole switch S and the unknown EMF source E. When the switch S connects to
terminal 2 then the capacitor becomes charged. Similarly, when the switch
connects to terminal 1, then the capacitor becomes discharges through the
resistor R, connected in series with the ballistic galvanometer.
The discharge current of the capacitor deflects
the coil of ballistic galvanometer through an angle θ. The formula
calculates constant of the galvanometer.
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