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Although much work has been done on the breakdown strength of oil, comparatively little has been done with impulse, or lightning-like, voltages. Most of this has been with sharp-edged electrodes resulting in indeterminate maximum stresses.
Measurement of the temperature coefficient of capacitance involves the measurement of very small changes of relatively large capacitors. Hence a prime requisite for the measuring equipment is a high sensitivity. The “double heterodyne” method illustrated in the attached figure, has a very high sensitivity and can detect changes of 0,001 micromicrofarads in a 1000 micromicrofarad capacitor.
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