Portable Wheatstone Bridge
This Bridge is fully portable with a built in sensitive Galvanometer and a dry battery. This is extremely useful for resistance measurements with a fair degree of precision. Series Arm : There are 4 decades of 10×1, 10×10, 10×100 and 10×1000 ohms Range Multimeter : A single rotary switch furnishes 7 range multipliers of X1000, X100, X10, X1, X0.1, X0.01 and X0.001. Range of Measurement : 0.001 ohm & 11.1 mega ohm. Battery : A built-in dry battery of 4.5 volts. There is a provision for using external battery for measuring high resistances. Galvanometer : Galvanometer of Model MO 65 with sensitivity 10 microamperes/ div. is used. Push Botton : Two push buttons for battery and galvanometer are provided. Accuracy : Both series and ratio coils are adjusted to an accuracy of
better than 0.05%. Overall Accuracy of measurements is better than ±0.1%.
a) Constantan Coil Accuracy ±0.1%.
b) Manganin Coil Accuracy ±0.02%.