Datasheet LM185-1.2, LM285-1.2, LM385-1.2 (Texas Instruments) - 9

LM185-1.2-N , LM285-1.2-N, LM385-1.2-N www.ti.com
SNVS742E – JANUARY 2000 – REVISED APRIL 2013
Calibration
1. Short LM385-1.2-N, adjust R3 for IOUT= temp at 1.8μA/°K 2. Remove short, adjust R2 for correct reading in °F
Figure 24. 0°F−50°F 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
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