In this lab you will use

• Here are the links to the actual lab sheets.
• Rectifying an AC Tachometer Signal - The original lab
• Rectifying an AC Tachometer Signal - Rectifying the Situation
• Diode detector.
• Here is a link to basic information about diodes.
• Diodes
• Note the following:
• Decay can be the percentage that the voltage "droops" from the peak to the time when the diode again begins to conduct (each cycle).  The original lab sheet asks you to measure decay.

• Supporting data - including:
• Scope data that shows the decay transients from cycle to cycle in the applied sinusoid.
• Scope data that shows the difference between the input signal and the output signal during the time when the capacitor is charging.
• Scope data that shows the change in the input signal due to loading the tachometer.
•   You can get all of the scope data using Benchlink, and you should get both pictorial data and data that can be used in a spreadsheet.
• The circuit diagram(s) of the circuit(s) used to gather data.
• From your data, prepare a short report that addresses these questions.
• If there is significant loading of the tachometer, explain what happens.
• Does using an isolation amplifier cure the loading?  Identify that amplifier on your circuit digaram and explain
• Determine if there is a decrease in the output wave shape due to diode threshold.  Identify on you plots where that occurs.
• Does using an isolation amplifier cure the diode threshold problem.  Explain.
• Explain the signal you see at the output during the transients.
• Hand it in as a lab report.  (i.e., do it as a lab group and clearly indicate the members of the group.)
• Hand in one lab report for each lab group.
• The report is due one week from the date on which the lab was performed.

• Diodes, Capacitors, Resistors, OpAmps (741s)
• Motor Units
• Voltmeters
• Oscilloscopes