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A measurement technique is described which enables a rapid determination of the current at which excessive internal heat generation takes place in a structure due to frequency sensitive factors.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
65% of the total text.
Page 1 of 1
Frequency Characterization Technique
A measurement technique is described which enables a rapid determination
of the current at which excessive internal heat generation takes place in a
structure due to frequency sensitive factors.
The measurement technique includes the step of generating a calibration
curve showing D.C. coil resistance vs. temperature. This can be done by the
apparatus shown in FIG. 1 which comprises a signal generator (current driver) 1,
a D.C. current supply 2, a low pass filter 3 and a Digital Voltmeter (DVM) 4. The
drive current from the signal generator 1 is A.C. coupled to the coil 5 by means of
a capacitor 6. A current is generated by supply 2, and this current is used to
measure the coil resistance. Low pass filter 3 filters the high frequency
components that energize the coil so that the DMV 4 measures the D.C. voltage
drop across the coil.
The D.C. coil resistance vs. temperature calibration curve is generated with
no signal from signal generator 1 and with the structure placed in a temperature-
controlled chamber. DMV voltage readings (corresponding to coil resistance
readings) are for different temperature settings of the chamber and this produces
a linear relationship of coil resistance vs. temperature.
Actual measurements of coil internal heating due to frequency sensitive
effects can then be made directly by the us the apparatus shown in FIG. 1.
Using this apparatus, the D.C. coil resistance as a function of signal generator 1