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LM185-1.2QML Datenblatt(PDF) 11 Page - Texas Instruments |
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LM185-1.2QML Datenblatt(HTML) 11 Page - Texas Instruments |
11 / 18 page LM185-1.2QML www.ti.com SNVS384B – OCTOBER 2005 – REVISED JANUARY 2014 Calibration 1. Adjust R1 so that V1 = temp at 1mV/°K 2. Adjust V2 to 273.2mV †IQ for 1.3V to 1.6V battery volt- age = 50 μA to 150μA Typical supply current 50 μA Figure 24. Centigrade Thermometer 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. Figure 25. Micropower Thermocouple Cold Junction Compensator Seebeck Voltage Voltage Thermocouple R1 R2 Coefficient Across R1 Across R2 Type ( Ω) ( Ω) ( μV/°C) @ 25°C (mV) (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 12.17 11.17 S 6.4 63.4 150 1.908 1.766 Copyright © 2005–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM185-1.2QML |
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