1_230 Lab Manual Winter2016.pdf

Close the welcome screen press no when asked to

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Close the welcome screen. Press No when asked to enable automatic checking for software update. Wait for the program to complete its routine and to identify the oscilloscope. Double click on the oscilloscope image and wait for the application to be launched. Select the appropriate bench layout so that only a single, maximized bench application is shown. You can now control the oscilloscope entirely from your PC. If a button is pressed on the instrument, PC control pauses. By pressing Resume , control is regained. Select Screen Image from the top left.
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18 Select the option “Invert Colors” (so that your printouts have a white background) and press Get Current Screen. Select “Save screen image or instrument state” from the bottom right and then select “Save image”. Select an appropriate name for your image, browse to C:/Users/XX/Download (where XX is your uniqname) and press OK twice. The selected folder will pop up and the recorded image will be in it. Back this file up by sending it to your lab partners, as it might not appear on other CAEN computers. 7 . Change the frequency of the signal source to f 2 = 75 MHz . Press Frequency followed by 75 MHz/mV 8. Adjust the oscilloscope display so that two periods are shown for both the input and output signals . Record the signal amplitudes v 1 , v 2 and the delay. Attach the display capture. 12 " BNC Cable 1. Replace the 180 BNC coNaxial cable with a 12 BNC coNaxial cable. 2 . Change the frequency of the signal source to f 1 = 75 kHz . Adjust the oscilloscope display so that two periods are shown for both the input and output signals . Record the signal amplitudes v 1 and v 2 and the time delay. You do not need to capture the display again, since the waveforms will be similar to the ones for the 180” cable. 3 . Change the frequency of the signal source to f 2 = 75 MHz . Adjust the oscilloscope display so that two periods are shown for both the input and output signals . Record the signal amplitudes v 1 and v 2 and the time delay. No capture of the display is required here either. Measured Data Copy the following chart into your lab book and fill in the measured data . If you are missing any data, please repeat the necessary parts of this experiment before proceeding. R 1 = ______ (Ω) R 2 = ______ (Ω)
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19 Frequency Cable v 1 (V) v 2 (V) Time delay, Δ T (ns) Phase diff., Δφ ( ) f 1 = 75 kHz 180” 12” f 2 = 75 MHz 180” 12” Analysis 1. (PreNLab) Compute the wavelength for frequencies f 1 and f 2 . Assume the relative permittivity ε r of the cable is 1.9. Tabulate the results . 2 . (PreNLab) Compute the ratio of ! to λ for the 12" BNC cable and the 180” BNC cable for frequencies f 1 and f 2 . Tabulate the results. 3 . If we were to ignore the cables in Fig. 1N2(c), then v out would be the same as v 2 measured by the scope . The output of the voltage divider is given by: !
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  • Winter '08
  • RAND
  • BNC

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