LM285-2.5 datasheet(8/13 Pages) NSC

8 / 13 page

LM385-2.5 Applications (Continued)

METER THERMOMETERS

0˚C–100˚C Thermomemter

00551926

Calibration

Short LM385-2.5, adjust R3 for I

OUT=temp at 1µA/˚K

Remove short, adjust R2 for correct reading in

centigrade

0˚F–50˚F Thermomemter

00551927

Calibration

Short LM385-2.5, adjust R3 for I

OUT=temp at 1.8 µA/˚K

Remove short, adjust R2 for correct reading in ˚F

Micropower Thermocouple Cold Junction

Compensator

00551906

Adjustment Procedure

Adjust TC ADJ pot until voltage across R1 equals Kelvin

temperature multiplied by the thermocouple Seebeck

coefficient.

Adjust zero ADJ pot until voltage across R2 equals the

thermocouple Seebeck coefficient multiplied by 273.2.

Seebeck

Voltage

Thermocouple

Co-

Across R1

Across R2

Type

efficient

(

Ω)(Ω)

@25˚C

(mV)

(

µV/˚C)

(mV)

52.3

523 1.24k

15.60

14.32

42.8

432

12.77

11.78

40.8

412 953

Ω

12.17

11.17

6.4

63.4 150

Ω

1.908

1.766

Typical supply current 50 µA

LM285-2.5 Datasheet(PDF) 8 Page - National Semiconductor (TI)

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