Signal Analysis

  We will now examine the output of each stage in the controller circuit. The goal is to describe the waveforms as precisely as possible. To do this we will measure two quantities, peak-to-peak voltage and frequency, of each signal. Connect the ground lead of the scope's probe to the ground lead at the bottom of the board (identified on the side of the board).

1.   Connect the scope probe to lead 1. This is the output of the 555 Timer. Measure the peak-to-peak voltage and frequency of the signal. Obtain a hard copy of the scope trace from the printer.

2. Connect the probe to lead 2. This is the output of the J-K flip flop. Measure the peak-to-peak voltage and frequency of the signal. Obtain a hard copy of the scope trace from the printer.

3.   Connect the probe to lead 3. This is the output of the Level Shifting Comparator (comparator 1). Measure the peak-to-peak voltage and frequency of the signal. Obtain a hard copy of the scope trace from the printer.

4. Connect the probe to lead 4, the output of the integrator. Measure the peak-to-peak voltage and frequency of the signal. Obtain a hard copy of the scope trace from the printer.

5. Connect the probe to lead 5, the output of comparator 2. Measure the peak-to-peak voltage and frequency of the signal. Obtain a hard copy of the scope trace from the printer. Measure the duty-cycle of the signal. Now vary the DC Signal voltage and observe the changes in the duty-cycle. Record the duty-cycle and rotor position for several DC input voltages.