Precision Kelvin Double Bridge

Precision Kelvin Double Bridge

Precision Kelvin Double Bridge

Category: Physics

Model No:P-672A

  • Usage- It is a precision bridge for the measurement of low resistance.
  • Basic Structure- A Bakelite panel enclosed in a teak wood box is used. Separate current and potential terminals, push buttons for battery and galvanometer terminals.
  • Objective: Kelvin's double bridge may be used for precision mesurement of four-terminal low resistances. Four terminal resistors have two current leading terminals and two potential terminals across which the resistance equals the marked nominal value. This is because, the current must enter and leave the resistor in a fashion that there is same or equivalent distribution of current density between the particular equipotent surfaces used to define the resistance. The additional points also eliminated any contact resistance at the current lead-in terminals.

Product Description

  • Range of Measurement-  1.1 to0.00002 ohms.
  • Maximum Current-  2 Amperes.
  • Accuracy- + 0.1%
  • Multiplying Ratios- A single rotary switch furnishes 3 multiplying ratios of x1, x0.1 and x0.01
  • Standard Resistance- 10 coils of 0.1 ohm each are arranged on a rotary dial and a circular slide wire of total resistance 0.1 ohm and of 500 sub-divisionsis equal to 0.0002 ohm on the normal range.

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