Adjust the potentiometers R11 and R13 to obtain VA = VB = -1 VDC. Record the DMM

Question

Adjust the potentiometers R11 and R13 to obtain VA = VB = -1 VDC. Record the DMM measurements for these voltages in Table 11 on the worksheet.

6. Calculate the output voltage VOUT using the formula in step IV.B.4. Record both the calculated value and DMM measurement of VOUT in Table 12 on the worksheet. Also determine the difference between the measured value and calculated value.

Explanation / Answer

Va=(15+15)/(10 k) * R11 -15 so Va=-1 ==>R11=4.667 kilo ohms Vb=(15+15)/(10 k) * R13 -15 so Vb=-1 ==>R13=4.667 kilo ohms b. Vout=((R4/(R4+R3))*Va+(R3/(R3+R4))*Vb)*(1+(R2/R1)) so Vout=Va+2*Vb=-3 volts

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