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LM385BXZ-2.5 Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LM385BXZ-2.5 Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 13 page LM385-2.5 Applications (Continued) METER THERMOMETERS 0˚C–100˚C Thermomemter 00551926 Calibration 1. Short LM385-2.5, adjust R3 for I OUT=temp at 1µA/˚K 2. Remove short, adjust R2 for correct reading in centigrade 0˚F–50˚F Thermomemter 00551927 Calibration 1. Short LM385-2.5, adjust R3 for I OUT=temp at 1.8 µA/˚K 2. Remove short, adjust R2 for correct reading in ˚F Micropower Thermocouple Cold Junction Compensator 00551906 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 8 |
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