Experiment An audio oscillator produces a voltage changing at a frequency which would be audible if it were sent to a speaker. Usually it can be adjusted throughout the range 20-20,000 hertz (cycles per second) or more, You can also adjust che amplicude and choose either sine or square waves, A11 three of these adjustments have some error which you will check in this experiment. The osciliator wili usually have a red and a black output. The black is ground or zero volts. It should be connected to any ground connection on the oscilloscope. The red is the wave which. you will display on the vertical inpur of the scppe. Frequency Start with a sine wave at 500 hertz and any amplitude you want. Count the distance across between peaks of the wave on the scope. Then multiply the distance times the time/cm seting to get the time (period) between peaks. The frequency is one divided by the period. The frequency from the scope will probably be different from the frequency you set on the oscillator. Calculate a percentage error . assuming the scope is correct. Repeat at these frequencies: 20;1500;20,000;50,000;1,000,000 hertz. Amplitude If you set a particular amplitude thien the oscillator should keep on sending out waves of that amplitude regardless of the fre . quency setting. Does it? Set the oscillator at one volt and 20hz. Record the peak to peak height (voltage) you see on the scope. Then measure the peak to peak height again at these frequencies: 1000; 10,000;1,000,000hz. Was the wave height the same at ali frequencies? Optional extra; Compare the voltage put out by the oscillator (one volt average RMS) with the average from the scope (.707 x half the peak to peak voltage). Wave Shape A square wave rises very fast then stays level then falls very fast. The quick rise and fall are hard to make electronically at high frequencies. Look at a very high frequency square wave and sketch the distorted shape.