Test and Measure
Sections 1.1-1.3
Section 1.1
Simple Sine Waves
In this section of the lab it walks through how ton use the function generator and oscilloscope. To produce a 10kHz sine wave we set the amplitude to 2 Vpp and the offset to 0V. To produce the sine wave we wanted I also had to change the frequency on the function generator with a time scale of 40us/div. Given a 10kHz signal a good time scale would be 2.5 ms or 5ms.
Section 1.2
Amplitude Modulation
In this section of the lab signals received by an AM radio are amplitude-modulated which correlates that the intelligence signal is carried along via a carrier wave. A good time scale with a 1 kHz intelligence frequency and a 1 MHz carrier frequency would be 250 us. In 1.2a we created a amplitude modulated signal by selecting 50% modulation. In 1.2b we used the function generator to create an amplitude modulated signal but viewed using the Spectrum analyzer. After following the directions to create the signal Tables 1.1 and 1.2 needed to be filled out. Other usages for the spectrum analyzer would be to design, test and maintenance of radio frequency circuitry.
Section 1.3
AM Signal Frequency Spectrum
(FFT method)
In this section of the lab we used one of the built-in features that decomposes a signal into the frequencies that make it up. Just like in Section 1.2 I obtained the data and filled out tables 1.3 and 1.4. The values were not the same as using the spectrum analyzer because using the FFT method breaks down the signal for more accurate measurements.
Pictures
Test and Measure
1.1 Simple Sine Waves
Figure 1.3
A 10kHz sine wave generated by the oscilloscope
1.2 Amplitude Modulation
Figure 1.7
An amplitude modulated wave with 50% modulation
1.2a A Simple AM Signal
Figure 1.9
A waveform spectrum
1.2b AM Signal Frequency Spectrum
Outstanding Quality
In this picture I created an amplitude modulated signal which is being viewed on the oscilloscope using the Spectrum Analyzer.
1.3 AM Signal Frequency Spectrum(FFT method)
Fast Fourier Transform
We are looking at the AM signal with the use of the oscilloscope's built-in fast Fourier transform feature.
Tables 1.1-1.4
Spectrum information (50% modulation) and Spectrum information (100% modulation)
These four tables in the picture have data concerning the lower sideband, carrier and upper sideband.
Reflective Writing
While completing this lab I had trouble figuring out how to work the function generator and oscilloscope to give me the correct results. I often struggled to get the right time scale to be able to view my output signal. At the end of the day I worked through my struggles and headaches and managed to either get help or figure it out on my own.