Instrumentation amplifier

The purpose of this section is to combine the advantages of a difference input with the high input resistance of the voltage follower in a complete instrumentation amplifier.

Wire up the instrumentation amplifier as shown (add the input voltage followers to the existing circuit).

to 2.5in

Check the offset of the instrumentation amplifier and adjust the difference amplifier offset potentiometer if needed. Measure $V_{\rm out}$ for various values of $V_1$ and $V_2$ so that you will be able to determine the difference gain and the common mode rejection ratio of the instrumentation amplifier. Be sure you have taken sufficient data to perform your calculations.

Describe the reasoning you used in selecting the values for $V_{1}$ and $V_{2}$. From these data, determine the gain and the CMRR. Explain your interpretation of the data. Compare your results with the expected values.