1270	Laboratory Project 1b: Electromyogram Circuit
	Laboratory Notebook Contents and Grading

 

  30            Communication

      4          Work recorded in notebook (rather than pasted in)

      8          Complete information: task descriptions, diagrams, data, reproducible one year later

      4          Written in Ink

      4          Student Signed every page

      4          Student Dated every page

      6          TA Signature for every lab session (-3 each session missed)

    6   VI.    Construction and Testing of Pre-Amps [Lab 1a (last section)]

                  A.    Construction

      1                  Explanation of task (constructed pre-amps circuits on breadboard)

      1                  Schematic of pre-amps

      1                  Explanation of testing (1 V 1 kHz sinusoid in, oscilloscope measure output)

                  B.    Drawing of Waveforms

      3                  Careful drawing of oscilloscope screen

    6    V.    Demonstrating the need for Pre-amps [Lab 1b]

                  B.    Procedure

      1                  Explanation of task (measured voltages for electrode model v-divider)

      2                  Table II-A filled in with measured values

      1                  Explanation of task (measured voltages for pre-amp model v-divider)

      2                  Table II-B filled in with measured values

  22   VI.    Deriving an Expression for the Differential Amplifier Output

                  A.    Deriving the Expression for v3

      1                  Explanation of task (deriving expression for output of diff-amp)

      1                  Schematic of differential-amp

    15                  Derivations: v+, v–, and v3

                  B.    Differential Gain

      5                  Derivation of v3 in terms of ¬

  24 VII.    Designing, Building, and Testing the Differential Amplifier

                  A.    Resistor values for a gain of 500

      4                  Explanation of how R1, R2, R3, and R4 chosen

      2                  List of values for R1, R2, R3, and R4

                  B.    Building and Testing the Differential Amplifier

      1                  Schematic (for circuit in Fig. 6 or for own circuit layout)

      1                  Explanation of test procedure including 6 V power supply and v-divider

      3                  Table of values of measured diff-amp output vs input 1 voltage

      3                  Table of values of measured diff-amp output vs input 2 voltage

                  C.    Measuring the Gain of the Differential Amplifier

      4                  Plot of v3 vs v2 – v1

      4                  polyfit() straight line fit of data

      2                  Calculation of gain of differential amplifier

  12 VIII.   Measuring and Analyzing EMG's

                  A.    Measuring EMG's

      1                  Explanation of task (used electrodes on biceps to measure EMG)

      5                  Printout of EMG waveform on oscilloscope

                  B.    Power versus Weight for EMG signals

      1                  Explanation of task (Matlab® calculation of power in EMG waveform)

                  C.    Plot of EMG Power versus Weight

      5                  Matlab® plot of power vs weight