Potentiometer - Cum Kelvin Bridge (EE - 523)

It is an improvement over standard potentiometer. A press button type sliding jockey moves along the graduated scale on a metallic rod. The dial has fourteen resistance coils connected in series. Each coils having its resistance equal to the resistance stretched wire. When connected with a Double Ratio Box the unit works a Kelvin Bridge. A tapping key is provided in the Galvano-meter circut, without double ration box. ohms. All coils are calibrated on imported testing bridge