Electrical Bridges

1. Industrial Kelvin Double Bridge : A very useful instrument for accurate measurement of low resistance such as shunts and specific resistances determinations. The bridge comprises of variable standard resistances, five multiplying ratios and galvo key. The standard resistances consists of 10 steps of (10x.01) ohms and a circular slide wire divided into 200 equal parts. The resistance of slide wire is 0.02 ohms. Provision is made for the corrections of the Zero of the bridges. The multiplying ratios are x100, x10, x1, x0.1 and x.01. The total range is 2 micro ohms to 11 ohms. All the coils are made of Constantan wire.Accuracy:0.05%


2. Conductivity Attachment: For use with above Kelvin bridges.


3. D.C.SourceForKelvin:


4. Spot Reflecting Galvo For Kelvin:


5. Industrial Kelvin Double Bridge: complete set consisting of conductivity attachment, DC Source, Spot Reflecting Galvo andTesting Certificate from Govt. Lab.


6. Portable Wheatstone Bridge : This instrument gives an accurate measurement of resistance and also locates faults in cables by adopting the Murray and Varley loop circuits tests. Complete with Galvanometer. The instrument is provided with another switch controlling the sensitivity on short circuiting the Galvanometer. Arrangements are provided to use an external galvo or high voltage source. Ratio arms of the bridge are capable of selecting and multiplying factors of .001, .01, .1, 1,10,100 and 1000 for conductive resistance measurements and for Varley loops tests and capable of selecting multiplying factors of 10, 100, 1000 for Murray test. Coils are of Constantan Wire. Accuracy of coils : 0.5%


7. Routine Quality with Metal Film Resistances:


8. Same as above but without Murray and Varley Loop Arrangement.


9. Schering Bridge: For measurement of capacitance. Made with metal film resistances of 1%Accuracy.


10. Desaughty Bridge: For comparison of capacities of condensers. Made with metal film resistances of 1%Accuracy.