EET221L_Wk2_Lab _4_Instrumentation_Amplifiers_Multisim

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Lab 4: Instrumentation Amplifiers - Multisim I. Objectives : After completing this lab experiment using Multisim, you should be able to: 1. Build and verify the operation of Wheatstone bridge for differential measurement. 2. Build and verify the behavior of Instrumentation amplifiers. II. Parts List : 1. (1) Instrumentation Amp: AD620AN 2. Resistors: (4) 10kΩ, (1) 15kΩ, (1) 5.6kΩ, (1) 4.7kΩ, (1) 2.2kΩ. 3. Capacitors: (2) 1µF III. Procedures : Wheatstone bridge: 1. Build the following Wheatstone bridge circuit using Multisim. R1 10kΩ R3 10kΩ R2 10kΩ R4 10kΩ VCC 12V A B Figure 1: Wheatstone bridge 1

2. Calculate the voltage at point A, at point B and between point A and B for various values of R 4 shown in table 2 below. Record the result in table 2 below under calculated values. R 4 Calculated values Measured value V A = R 4 R 3 + R 4 * V CC V B = R 2 R 1 + R 2 * V CC V AB = V A - V B V AB 10kΩ 15kΩ 5.6kΩ 4.7kΩ Table 2: Calculated and measured values 3. Measure the voltage between the points A & B using DMM. Record the result in the table 2 above under measured value. 4. Replace the resistor R 4 with the listed values shown in the table 2 above and repeat step 3. 5. Once completed, replace the R 4 back with 10kΩ. Wheatstone bridge with Instrumentation Amplifier: 6. Build the following Instrumentation amplifier (IA) circuit. Observe the output of the Wheatstone bridge (at point A & B) are connected to the inputs of the IA’s. U1 AD620AN 3 2 4 7 6 1 5 8 R1 10kΩ R3 10kΩ R2 10kΩ R4 10kΩ VCC 12V VEE -12.0V RG 15kΩ A B VOUT C1 1µF C2 1µF Figure 2: Instrumentation Amplifier 2

7. Referring to the data sheet of the AD620AN Instrumentation amp, the gain formula is Voltage gain (Av) = 1 + 49.4 k RG 8. Calculate the voltage gain value for various values of R G shown in table 3 below. Record the results under calculated Gain Av. Calculated Gain Av Measured R G R 4 V+ (at pin 3) V- (at pin 2) V OUT (at pin 6) 15kΩ 10kΩ 10kΩ 5.6kΩ 2.2kΩ 9.5kΩ Table 3: Calculated and measured values 9. Measure the voltage at pin 3 of AD620AN. Record the result in table 3 above under V+. 10. Measure the voltage at pin 2 of AD620AN. Record the result in table 3 above under V-. 11. Measure the voltage at pin 6 of AD620AN. Record the result in table 3 above under V OUT . 12. Change the resistors R G and R 4 to the list of the values shown in table 3 above and repeat the steps from 9 through 11. Lab Questions: 1. Referring from the table 2 above, what value of R 4 make the bridge balanced and why? State your reasons clearly below. 2. Provide at least two advantages of Wheatstone bridge are as supposed to a simple voltage divider? 3

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3. Remember that, an instrumentation amplifier, amplifies the difference between two input voltage levels V+ and V- by a gain (Av) set by a single resistor R G . i. Referring to table 3, Calculate the output voltage for all the combinations using the formula V OUT = (V+ - V-) * Av. Use measured V+, V- and calculated Av. ii. How it is compared to measured V OUT ? 4. In general, internally how many op-amps are needed to build an instrumentation amplifier? _________. 5. Provide at least two advantages of Instrumentation amplifiers over traditional inverting or non-inverting amplifiers? 4

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