A Flux Voltmeter for Magnetic Tests

A voltmeter is described for a-c. circuits the voltage indications of which are directly proportional to the maximum flux density, regardless of the wave shape of the voltage. While the instrument is suitable for many varieties of magnetic tests, its most important application is to the reduction of transformer coreloss measurements to sine-wave basis. Test data indicate excellent accuracy for the meter in this application in comparison with other schemes or outfits used at the present time for that purpose. Losses determined by this new meter are, in general, appreciably larger than those determined by the older methods. The new meter makes it unnecessary to use, for reliable results, large generators to reduce the wave distortion caused by transformer excitation loads, and permits the use of any generator that will carry the load thermally.