Thermocouple_cold_junction_compensation_grounded_thermocouple

Published:2009/7/24 3:06:00 Author:Jessie | From:SeekIC

Fig.13-39 This circuit is preferable to that of Fig．13-38, but it requires dualsupplies. To trim, short out the LM329B and adjust R5 so that VO(across R1)equals the Seebeck coefficient(in μV/℃)times the absolute temperature. Remove the short and adjust R4 so that VO, equals the thermocouple output voltage at ambient. This circuit requires good grounding because any ground differential will appear in series with the thermocouple output, National Semiconductor Linear Applications Handbook, 1991, p. 524.



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