Portable Wheatstone Bridge Laboratory Equipments Supplies

a) General : This bridge is fully portable with a built in sensitive Galvanometer and a dry battery. The bridge is extremely useful for resistance measurements with a fair degree of precision. b) Series Arm : There are 4 decades of 10 x 1, 10 x 10, 10 x 100 and 10 x 1000 ohms. c) Range Multiplier : A single rotary switch furnishes 7 range multipliers of x 1000, x100, x10, x1, x0.1, 0.01 and 0.001. d) Range of Measurement : 0.01 Ohm to 1.11 mega ohms. e) Battery : A dry battery of 4.5 volts is built-in provision is there for using external battery for measuring high resistances. f) Galvanometer : The bridge can be supplied with types of built-in galvanometer. 1) Student galvanometer of M.O. 65 model, and of sensitivity 10 microamperes/mm. 2) Taut suspension galvanometer of coil resistance 100 ohmsand sensitivity of 0-5 microampere per mm and with a mechanical coil locking device and a zero adjuster. 3) In both models, external more sensitive galvanometer such as our spot reflecting galvanometer as above can be use for greater discrimination and accurate null point. g) Resistance Coil : Manganin coil which are non inductivity wound, aged and properly varnished are used. h) Push Button : Two push buttons for battery and galvanometer are provided. i) Accuracy : Both series and ratio coils are adjusted to an accuracy of better than 0.05% 1) Overall Accuracy of measurements is better than + 0.1% 2) With Students galvanometer of M.O. 65 model 3) With Taut suspension galvanometer.