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LM185BYH2.5-QV Fiches technique(PDF) 10 Page - Texas Instruments |
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LM185BYH2.5-QV Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 14 page Applications (Continued) Improving Regulation of Adjustable Regulators 20156207 Micropower Thermocouple Cold Junction Compensator 20156206 Adjustment Procedure 1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature multiplied by the thermocouple Seebeck coefficient. 2. Adjust zero ADJ pot until voltage across R2 equals the thermocouple Seebeck coefficient multiplied by 273.2. Seebeck Voltage Voltage Thermocouple Co- R1 R2 Across R1 Across R2 Type efficient ( Ω)(Ω) @25˚C (mV) ( µV/˚C) (mV) J 52.3 523 1.24k 15.60 14.32 T 42.8 432 1k 12.77 11.78 K 40.8 412 953 Ω 12.17 11.17 S 6.4 63.4 150 Ω 1.908 1.766 Typical supply current 50 µA www.national.com 9 |
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