Title :
Optimizing the series connection of thermal converters for AC current step-up
Author :
Lind, K. ; Espedalen, J.H.
Author_Institution :
Justervesenet, Nat. Stand. Dept., Kjeller, Norway
Abstract :
When comparing AC-DC current differences of thermal converters connected in series, capacitive leakage currents from the interconnecting point to the surroundings, and the heater to thermocouple capacitance can become significant, particularly at high frequencies. A method of optimising the series connection, to reduce the leakage currents to less than 5/spl times/10/sup -6/ relative to the measured current, has been modelled and tested experimentally.
Keywords :
capacitance; circuit optimisation; circuit simulation; convertors; electric current measurement; heating elements; leakage currents; thermocouples; AC current step-up thermal converters; computer aided circuit simulation; converter AC-DC current differences; current measurement; heater/thermocouple capacitance; high frequency capacitance effects; interconnecting point capacitive leakage currents; leakage current reduction; series connected thermal converter optimization; Analog-digital conversion; Capacitance; Circuits; Frequency; Inductance; Leakage current; Resistance heating; Thermal resistance; Voltage; Voltmeters;
Conference_Titel :
Precision Electromagnetic Measurements, 2002. Conference Digest 2002 Conference on
Conference_Location :
Ottawa, Ontario, Canada
Print_ISBN :
0-7803-7242-5
DOI :
10.1109/CPEM.2002.1034703
