You are deciding between using a 5000 ohm thermistor, Material System 1, or a class A RTD for measuring the temperature of a critical circuit board of a smart phone near 30°C. The accuracy must be within 0.25°C throughout the range of measurement. Neither speed of response nor component cost is an issue. The 5000-ohm thermistor is defined in the table below.

R25 Ω Material System B Value 25/85 °C/K Max Operaturing Temp° F (°C)

Code R25 °C + 1%

500 2 3540+/-1% 257 (125)

500 2A 3627+/-1% 257 (125)

1000 2 3540+/-1% 257 (125)

1000 2A 3627+/-1% 257 (125)

1800 2 3540+/-1% 257 (125)

2000 2 3540+/-1% 257 (125)

2000 2A 3627+/-1% 257 (125)

2200 1 3977+/-1% 311 (155) NK222C1*1

2700 1 3977+/-1% 311 (155) NK272C1*1

3000 1 3977+/-1% 311 (155) NK302C1*1

5000 1 3977+/-1% 311 (155) NK502C1*1

5000 4A 3436+/-1% 311 (155) NK502C4A1*1

10000 1 3977+/-1% 311 (155) NK103C1*1

You are deciding between using a 5000 ohm thermistor, Material System 1, or a class A RTD for measuring the temperature of a critical circuit board of a smart phone near 30°C. The accuracy must be within 0.25°C throughout the range of measurement. Neither speed of response nor component cost is an issue.

The 5000-ohm thermistor is defined in the table below.

Given the tolerance on β for the thermistor, what is the absolute value of the accuracy of the reading in °C that you will get on the thermistor at 30°C? (Type in a three-decimal number)

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