Portable Wheatstone Bridge
Model ETK0020
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.
Series Arm :
• There are 4 decades of 10 x 1, 10 x 10, 10 x 100 and 10 x 1000 ohms.
Range Multiplier :
• A single rotary switch furnishes 7 range multipliers of x 1000, x100, x10, x1, x0.1, 0.01 and 0.001.
Range of Measurement :
• Ohm to 1.11 mega ohms.
Battery :
• A dry battery of 4.5 volts is built-in provision is there for using external battery for measuring high resistances.
Galvanometer :
The bridge can be supplied with types of built-in galvanometer.Student galvanometer of M.O. 65 model, and of sensitivity 10 microamperes/mm.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.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.
Resistance Coil :
• Manganin coil which are non inductivity wound, aged and properly varnished are used.
Push Button :
• 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%
• With Students galvanometer of M.O. 65 model
• With Taut suspension galvanometer.
