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Expt_29

Expt_29 - Lab-in-a-Box Experiment 29 Electromagnetic...

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Lab-in-a-Box Experiment 29: Electromagnetic Interference Name: ______________________ Pledge: _____________________ ID: ______________________ Date: ______________________ Procedure R 1 3 1 0 k - 9 V O p - A m p 2 0 A n t e n n a V o A n t e n n a 0 0 R 1 2 1 0 k 1 : 1 1 0 k 1 M L F 3 5 6 6 3 2 7 4 O U T + - V + V - + 9 V L F 3 5 6 6 3 2 7 4 O U T + - V + V - 0 V 2 V 1 1 M 0 1 0 k L F 3 5 6 6 3 2 7 4 O U T + - V + V - I n s t u m e n t a t i o n A m p l i f i e r V i n F R E Q = 2 0 0 V A M P L = 0 . 1 v + 9 V - 9 V 1 0 k R 1 4 1 0 K 1 0 k - 9 V + 9 V O p - A m p 1 Figure 2: Circuit diagram for an EMI experiment. Analysis (Extra Credit): 1. Provide a detailed derivation of Eq (1)in the text. Measurements: Part A: Build and test instrument amplifier 2. Construct the instrumentation amplifier shown inside the dotted box in Figure 2 and connect the 10 kΩ trim pot across the inverting pins of the two input op amps (op amp 1 and op amp 2). It is suggested that you start the circuit in column 20 of the breadboard in order to leave space for the transformer circuit. 3. Install the transformer circuit on the breadboard and connect the function generator across the primary side as shown in Figure 2. 1 of 3

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4. Using two short pieces of wire, connect the secondary side of the transformer (you may use either coil) to the non-inverting inputs of op amp 1 and op amp 2. Be sure to use the 1:1 terminals of the transformer as identified in Experiment 26. 5. Connect the function generator output to the x1 attenuator of Channel 1 and the output of op amp 3 to the x1 attenuator of Channel 2. 6. Set the function generator to 0.2 V peak-to-peak and the frequency to 200 Hz.
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