PURPOSE:To heat a dielectric sample continuously in high efficiency and thereby to enable measurement of a constant of a dielectric material in a short time by disposing the sample in a shield case, by injecting a power of a high frequency being the same with a resonance frequency and by heating the sample in a resonance mode. CONSTITUTION:A control device 45 measures a temperature T1 of a dielectric sample 16 before heating by a temperature sensor 44 and stores it. A switch 58 being closed, subsequently, a dielectric resonator 12 is made to resonate and a frequency F1 is measured and stored. The switch 58 being opened, thereafter, the frequency F1 is generated from a signal generator 46 and the sample 16 is heated. The temperature thereof is measured after a prescribed time and high-frequency heating is repeated until a prescribed temperature T2 is reached, with the switch 58 opened and closed and with the resonance frequency checked. When the resonance frequency at the temperature T2 is stored as F2, a temperature coefficient eta1 of the frequency of the sample can be calculated from the F2 and the resonance frequency F1 at the temperature T1, as (1/F1)(F2 - F1)/(T2 - T1).
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