Motor Frequency Response

Manual

First, you will apply sinusoidal inputs to the motor, adjusting the frequency manually, and measuring the output amplitude and phase.

Procedure

  1. Set the function generator and oscilloscope.
    Set the function generator to sinusoidal waveform.
    Set the frequency to 0.2Hz
    Set the time scale on the oscilloscope so that one or two full periods of the sinusoid are on the screen.
    Use the cursors to measure the output amplitude.
    Use the time cursors to measure the time difference between a valley of the input sinusoid and the closest valley of the output sinusoid.

    Output will appear as shown below. Click to Enlarge

    Print this screen.

  2. Take the data in the following (just amplitude and delay), adjusting the input frequency and the time scale on the oscilloscope as appropriate. Print at least one more screen at a higher frequency, such as 10 or 20Hz as shown below. Click to Enlarge

    Freq. Output
    Amplitude    		 Delay
    Amplitude out

    /
    Amplitude in
    		(dB)
    		Phase
    0.2Hz
    0.3Hz
    0.5Hz
    1Hz
    2Hz
    3Hz
    5Hz
    10Hz
    20Hz
    30Hz
    50Hz
    100Hz
    200Hz

Next- Automated Spectrum Analyzer and Writeup

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