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Testing guides - ECE3820 Principles and Practice of...

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ECE3820 Principles and Practice of Biomedical Engineering Laboratory Lab Fall’11 1 of 3 Fig. 2 Circuit schematic Fig. 3 Input voltages Fig. 4 Connection diagram for time domain test In class: Building and testing the circuit. You will need: 1. Breadboard 2. Three Opamps (example: LM741) 3. Resistors 4. One 10kΩ potentiometer Testing the Circuit a) Offset Null for LM741: a) Adjust the 10K potentiometer to its center position. b) Connect the potentiometer outside leads between pins 1 and 5 of the op-amp. c) Make sure that the power is on. d) Connect the wiper of the potentiometer to the negative supply voltage (-15 V). e) Adjust the potentiometer to its center position b) Time domain test a) Use NI ELVIS function generator to generate a 10Hz 10mv sine wave signal. b) Build a simple voltage divider circuit to obtain a 10 Hz sine wave signal with amplitude of 5 mV c) Connect the output of the function generator to the positive input of the instrumentation amplifier and ACH0+ on the ELVIS board as shown in Fig. 3 & 4 d)
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