User:Randy Jay Lafler/Notebook/Physics 307L/2010/08/30

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Oscilloscope Lab

 * In this lab we used a signal generator to produce a signal, and analized the signal with an oscilloscope. Our goal was to learn how the oscilloscope functions.

Procedure

 * We connected the signal generator to the oscilloscope with a BNC cable.
 * Set the signal generator to 200Hz. Measure the voltage and frequency of the signal using the grid, the cursor, and the measure function at high, medium, and low output.

Measurements
1) Measurments for medium output Using oscilloscope grid Amplitude = 6V Frequency = 200Hz Using the cursor Amplitude = 6.12V Frequency = 200Hz Using measure function on oscilloscope Amplitude = 6.20V Frequency = 200.8Hz 2) Measurements for high output Using the cursor Amplitude = 22.2V Frequency = 200.0Hz Using measure function on oscilloscope Amplitude = 22.4V Frequency = 200.4Hz 3) Measurements for low output Using the cursor Amplitude = 2.10V Frequency = 196.1Hz Using measure function on oscilloscope Amplitude = 2.08V Frequency = 200.4Hz 4) Measurements with the DC offset on full and with the same low output Using cursor Amplitude = 2.00v Frequency = 192.3Hz Using measure function on oscilloscope Amplitude = 2.20v Frequency = 200Hz
 * But the frequency is fluctuating between about 150-300Hz.

Triggering

 * Edge triggering shows the wave as an image on the display by assigning a point on the wave to t=0 with the trigger arrow.
 * Rising edge triggering catches the wave at a point where the slope of the wave is positive, and Falling edge triggering catches the wave at a point where the slope is negative and falling.

Fall time



 * We created a square wave at 10Hz and 7V and using AC coupling.
 * We measured the fall time as the time change during the dip in the wave.
 * Using the cursor we found a fall time of 45.20ms.
 * Using the measure function we got a fall time of 39.99ms.
 * The RC constant is the fall time divided by 2.197.
 * RC=18.20ms


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