9

LT1025

1025fb

TYPICAL APPLICATIO S

+

–

°C) TO BE SET

INDEPENDENTLY FROM AN ARBITRARY HIGH TEMPERATURE CENTER POINT (1000

°C). THIS IS

REQUIRED BECAUSE THE SLOPE OF TYPE “S” THERMOCOUPLES VARIES RAPIDLY WITH

TEMPERATURE, INCREASING FROM 6

µV/°C AT 25°C to 11µV/°C AT 1000°C. NONLINEARITY LIMITS

ACCURACY TO

≈3°C OVER THE 800°C TO 1200°C RANGE EVEN WITH OFFSET CORRECTION

V

+

V

+

V

–

TYPE S

R7

750k

R6

12k

–15V

LT1009

2.5V

R4

1.37M

1%

R1

1k

1%

R2**

100

Ω

FULL-SCALE

TRIM

R3

909k

1%

0.1

µF

0.1

µF

1

4

8

6

7

3

5

2

R5*

10k

OFFSET

TRIM

R4

2.7k

1

µF

0.1

µF

15V

10mV/

°C

800

°C TO 1200°C

LT1025

LT1052

GND

R

–

R,S

–+

LT1025 • TA06