At 25C, an RTD has a resistance of 500 2 and a dissipation constant of PD=...

 

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At 25°C, an RTD has a resistance of 500 2 and a dissipation constant of PD= 50 mW/°C. Temperature coefficient of resistance of RTD is a 0.0039/C. This RTD is used in a bridge circuit as shown in the Figure Q. 3, with R₁ = R₂ = 500 and R3 a variable resistor used to balance the bridge. If the supply is 12 V and the RTD is placed in a bath at 0°C, find the value of R3 to null the bridge - [5] (a) Without the self-heating effect, (b) With the self-heating effect. ww R2 R1 wy RTD R= F3 At 25°C, an RTD has a resistance of 500 2 and a dissipation constant of PD= 50 mW/°C. Temperature coefficient of resistance of RTD is a 0.0039/C. This RTD is used in a bridge circuit as shown in the Figure Q. 3, with R₁ = R₂ = 500 and R3 a variable resistor used to balance the bridge. If the supply is 12 V and the RTD is placed in a bath at 0°C, find the value of R3 to null the bridge - [5] (a) Without the self-heating effect, (b) With the self-heating effect. ww R2 R1 wy RTD R= F3

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