Abstract
Six types of planar thermal converters from TC 1 to TC 6 were designed and fabricated for the purpose of being used as practical standards to alternating current. The respective voltage responses in air and in a vacuum of TC 6, which has the smallest thermal loss, were about 4.03mV/mW and about 6.38 mV/mW. Thermal time constant of TC 6, which has also the smallest heater thermal inertia, was about 8 ms. The respective variations of AC-DC voltage and current transfer errors from sample to sample, which were measured by FRDC(fast reversed DC) method, were about $\pm$0.41 ~$\pm$0.85 ppm and about $\pm$0.15~$\pm$1.16 ppm in the frequent range of 40 Hz~10 KHz with appling 1 V and 5 mA rms sine waves to the converters. All converters investigated exhibited sufficiently low AC-DC transfer errors to be used as practical standards.
교류의 실용 표준기로 사용하기 위해 TC 1에서 TC 6까지 6개의 평면형 열전변환기를 설계 및 제작하였다. 공기중 및 진공중의 전압 감응도는 TC 6의 경우 열손실이 가장 작아 약 4.03 mV/mW 및 약 6.38 mV/mW의 가장 큰 값을 나타내었다. 열시정수는 히터의 열관성이 가장 부족한 TC 6을 측정하여 약 8 ms를 얻었다. FRDC(fast reversed DC) 방법에 의한 교류-직류 전압 및 전류 변환오차는 40 Hz∼10 ㎑ 주파수 범위에서 1 V 및 5 mA의 정현파 실효전압 및 실효전류를 인가하였을 때 약 ±0.41∼±0.85 ppm 및 약 ±0.15∼±1.16 ppm으로서 실용표준으로 사용하기에 적합하였다.