The unknown resistance Ru of a resistance thermometer is measured by a deflectiontype bridge circuit of the form shown in Fig. 6.2, where the parameters have the following values: R1 ¼ 100 U ; R2 ¼ R3...

The unknown resistance Ru of a resistance thermometer is measured by a deflectiontype bridge circuit of the form shown in Fig. 6.2, where the parameters have the

following values:

R1 ¼ 100 U ; R2 ¼ R3 ¼ 1000 U ; Vi ¼ 20V

The thermometer has a resistance of 100 U at 0C and the resistance varies with temperature at the rate of 0.4 U/

C for small temperature changes around 0C.

(a) Calculate the bridge sensitivity in units of volts/ohm.

(b) Calculate the sensitivity of the total measurement system in units of volts/C for

small temperature changes around 0C