By D. J. Dewhurst (Auth.)

ISBN-10: 0080187552

ISBN-13: 9780080187556

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The relative permeability (usually referred to simply as the permeability) of a magnetic material is represented by the symbol / A ; it is the factor by which the inductance is increased when that material is substituted for a vacuum in the core. Typical magnetic materials have permeabilities in the range from 500 to 5000, although it is possible to produce materials with permeabilities up to 100,000. A second property which must be considered in selecting a magnetic material is the ease with which it saturates.

28, 326 (1957). 36 AN INTRODUCTION TO BIOMEDICAL INSTRUMENTATION F I G . 7. Thermistor thermometer. 1 If a recording potentiometer with a range of 0-20 or 0-25 mV is available, set up a copper-constantan thermocouple, using wires of about 22 gauge SWG (20 gauge Β & S). Immerse one junction in a mixture of ice and water; immerse the other in boiling water, and note the deflection produced. Now use the hot junction to estimate the temperature of molten solder, and the temperature produced at distances of 5 cm, 2 cm, 1 cm and 0-5 cm along a copper wire as the result of a normal soldering operation.

1 I LÜ -ι WWWV BLACK 28 AN INTRODUCTION TO BIOMEDICAL INSTRUMENTATION F I G . 7. Front of completed multimeter. FIG. 8. Rear of completed multimeter. METERS TO POTENTIOMETER FIG. 9. Switch detail. 1 U S E OF POTENTIOMETER AND WHEATSTONE BRIDGE These two instruments are basically intended for high precision laboratory measurements of voltage and resistance. The potentiometer, developed by Kohlrausch in Germany, is a device for comparing an unknown with a standard voltage. The Wheatstone bridge, developed by Sir Charles Wheatstone in Britain, is a device for comparing an unknown with a standard resistance.

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An Introduction to Biomedical Instrumentation by D. J. Dewhurst (Auth.)


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