Electrical Measurement And the Galvanometer Its Construction And Uses
The book Electrical Measurement And the Galvanometer Its Construction And Uses was written by author Thomas Dixon Lockwood Here you can read free online of Electrical Measurement And the Galvanometer Its Construction And Uses book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Electrical Measurement And the Galvanometer Its Construction And Uses a good or bad book?
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Find first the constant of the galvanometer: that is, ascer- tain what deflection the galvanometer gives with a standard battery, through a standard resistance. Refer to the table for the tangent of the constant. Then connect the galvanometer in circuit with the line whose insulation resistance is to be measured, and with the same battery that was used to take the constant. One pole of the battery must be connected to earth and the other to galvanometer terminals. The other galvanometer termina...l must be attached to the line, and the distant end of the line left open. Note the deflection. Find its tangent, by reference to the table. Then the tangent of the latter deflec- 115 tion is to the tangent of the former as the standard resistance is to the insulation resistance required. For example : With a tangent galvanometer, connected in circuit with ten cells of battery and a standard resistance of 5,000 ohms, we get a deflec- tion of 40 degrees. This we call the constant. Referring to the table of tangents, we find the tan- gent of that deflection to be .839.
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