The Effect of Frequency on the Amplitude of a Square Wave

1. Turn in printouts of the following tables and screencaps.  Printouts should be clearly labeled or described; do not assume that your TA will recognize any recordings.

Manual calibration of known weights Screencap

Unknown weights being measured after two-point calibration Screencap

A table showing Unknown weights as measured using the manual calibration, 2-point calibration, and the balance

A Screencap  of Single stimulation sweep

Sweep with 4 stimuli Screencap

A table showing Duration, amplitude, and rate measurements from the 4 pulses

2.    

a. How does the weight of your unknowns compare to measurement taken using the scale and the automatic 2-point calibration method?  Why might these values differ?

3. For the nerve chamber experiment, create a table of the mean duration of all peaks, amplitude of each peak as well as mean amplitude of all peaks, and the calculation of rates of peaks per second and in Hertz.

a. Did your recorded frequency match the output stimulus frequency?

Yes, it remained to be 6428 peaks/min

4. What was the initial concentration of the sucrose solution used in the mini-experiment?   Give a step-by-step explanation of how you arrived at this value.

5. Draw what the recording window would look like if you saw a 1 volt, 5 second square wave when the recording screen is set to each of the following settings:

Range (y-axis)

Screen Display Time (x-axis)

1 volt

1 minute

100 volts

1 minute

100 millivolts

1 minute

1 volt

5 seconds

1 volt

60 minutes

6. Your lab partner is trying to record the mass of something relatively small using a force transducer and is convinced that it is broken because the output always appears to be zero grams.  You notice that the vertical range of the graph window is set from -100 to 100 grams.  What suggestion might help your lab partner?

Answer

I would advise my friend to consider reducing the range of the values in the vertical axis from current -100 to 100 grams to a smaller range of say 0 grams to 40 grams.