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LM135AD 데이터시트(PDF) 9 Page - STMicroelectronics |
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LM135AD 데이터시트(HTML) 9 Page - STMicroelectronics |
9 / 11 page THERMOCOUPLE COLD JUNCTION COMPENSATION (compensation for grounded thermocouple) LM135 LM235 LM335 R1 10k Ω 4.7k Ω +15V 1N4568 R2 10 k Ω R3* 200k Ω 1M Ω 1% Thermocouple -15V 12k Ω 71.5k Ω 1% 1% * Select R3 for proper thermocouple type Adjustments : compensates for both sensor and resistor tolerances. 1. Short 1N4568. 2. Adjust R1 for SEEBEC K coefficient times ambient temperature (in degrees K) across R3. 3. Short LM135 and adjust R2 for voltage across R3 corresponding to thermocouple type. J 14.32mV K 11.17mV T 11.79mV S 1.768mV Thermo- couple R3 Seebeck Coefficient J T K S 377 Ω 308 Ω 293 Ω 45.8 Ω 52.3 µV/oC 42.8 µV/oC 40.8 µV/oC 6.4 µV/oC SINGLE POWER SUPPLY COLD JUNCTION COMPENSATION LM135 LM235 LM335 R1 10k Ω 10k Ω +15V +15V 1N4568 200k Ω 1M Ω R2 10 k Ω R4* Output Thermocouple R3* 200k Ω * Select R3 and R4 for proper thermocouple Adjustments : 1. Adjust R1 for the voltage across R3 equal to the SEEBECK coeffi cient times ambient temperature in degrees Kelvin. 2. Adjust R2 for voltage across R4 correspon- ding to thermocouple. J 14.32mV K 11.17mV T 11.79mV S 1.768mV Thermo- couple R3 R4 Seebeck Coefficient J T K S 1.05k Ω 856 Ω 816 Ω 128 Ω 365 Ω 315 Ω 300 Ω 46.3 Ω 52.3 µV/oC 42.8 µV/oC 40.8 µV/oC 6.4 µV/oC LM135-LM235-LM335,A 9/11 |
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