bmen_305_lab_6

bmen_305_lab_6 - Introduction The purpose of this lab was...

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Introduction The purpose of this lab was to create a two staged instrumentation amplifier. This was done by creating a VI in LabView to acquire an ECG signal from one lab partner using lead 1 configuration of the bipolar lead system. The VI was also modified to include a heart rate monitor. Materials and Methods Materials: Instrumentation amplifier AD620 x 2 Resistors 499 x 1 5 k x 1 ECG Electrodes x 3 9 Volt Batteries x 2 NI ELVIS LabVIEW Methods: Part 1: For stage 1 of the amplifier, the circuit shown in Circuit Diagram 1 was built. This circuit’s gain was 10. The 9 volt batteries were used for the +Vs and –Vs connections. Rg for this circuit was 5.1kOhms. A 1 kHz sine wave of amplitude Vin = 100 mVp-p was the input from the ELVIS function generator. The output voltage was observed on the ELVIS oscilloscope. The gain was calculated by the formula Vo/Vin = gain. Stage 2 of the amplifier was built by replacing Rg with a 470 Ohm resistor. The 9 volt batteries were used again and positive and negative Vs. This circuit’s gain is 100. The same input as stage 1 was given, and the output was observed on the oscilloscope. The gain was calculated. Then, the output of stage 1 became the input to stage 2. The overall theoretical gain should be Ad1 X Ad2 = 10 X 100 = 1000. A 1 kHz sine wave with 100 mVp-p was used as the input to the 1 st stage. The output was observed on the ELVIS oscilloscope. The overall gain was measured by Ad = Vo/Vin. 1 Circuit Diagram 1
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Part 2: First, make sure the function generator is disconnected from the circuit. Three electrodes were given to us. The electrodes were connected in lead 1 configuration. The right and left arms were connected to the input of the circuit, while the right leg was grounded. The output was observed on the ELVIS oscilloscope.
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This note was uploaded on 11/03/2009 for the course BMEN 305 taught by Professor Meissner during the Spring '07 term at Texas A&M.

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bmen_305_lab_6 - Introduction The purpose of this lab was...

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