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Electric and Magnetic Measurements and Measuring Instruments

Electric and Magnetic Measurements and Measuring Instruments


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ...is of the cable type in which the primary winding is a straight section of the conductor carrying the current to be measured, while the secondary winding is formed of several turns of finer wire laid parallel to it. In the second form of transformer, the primary winding incloses the secondary, while in the third, the structure is similar to that of the ordinary lighting transformer, but instead of having the primary windings make sev Fig. 144. eral turns about one side of the iron core, it passes straight through it, being thus in effect a half turn, although this is, of course, completed to make a full turn by the return circuit from the load as formed by the other bus-bar. All have a transformation ratio that varies somewhat with the varying frequencies, and hence, all must be calibrated for the number of alterations on which they are to be used. SHUNTS FOR ALTERNATING CURRENT INSTRUMENTS. As mentioned above, shunts are sometimes used in connection with alternating current ammeters, this being done when there is no necessity for interposing a high insulation between the instrument winding, and the current carrying conductors, and when the instrument is of a type sufficiently sensitive to be actuated by the drop across a shunt of commercial dimensions. As instruments sufficiently sensitive to use on these drops are usually of the hot wire pattern in which the inductance is low, it is a matter of small difficulty to make the design such that the ratio of the inductance to the resistance of the shunt and the instrument are equal so that the frequency of the current being measured introduces no error, and the apparatus may be used on either direct or alternating current without its being necessary to employ correction factors, or draw in additional scales. Ve...


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Product Details
  • ISBN-13: 9781152756212
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 104
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1152756214
  • Publisher Date: 14 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 200 gr


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