User:Jared A. Booth/Notebook/Physics 307L/2009/08/24: Difference between revisions

Revision as of 10:28, 13 September 2009

Project name

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Equipment

Tektronix TDS 1002 Digital Storage Oscilloscope BK Precision 4017A 10MHz Sweep/Function Generator BNC Cable

Setup

Plug both the oscilloscope and the function generator into a 120V AC wall outlet and connect the BNC cable to the output of the function generator and the CH1 lead on the oscilloscope. Turn on both the generator and oscilloscope.

Waveform Measurments

Wave 1

Set the generator to a sine wave at 200Hz. Measure the peak-peak voltage:
7.52V --measured by grid
7.52V --measured by cursors
7.52V --measured by oscilloscope

Wave 2

Set the generator to a sine wave at 75Hz. Adjust the output level slightly. Measure the peak to peak voltage:
9.90V --measured by grid
9.84V --measured by cursors
9.84V --measured by oscilloscope

Wave 3

Set the generator to a sine wave at about 7kHz. Adjust the output to a high level. Set the oscilloscope to acquire an average of 64 samples to remove the fluctuations in the wave towards the peaks. Measure the peak to peak voltage:
19.52V --measured by grid
19.56V --measured by cursors
19.5V --measured by oscilloscope.

Wave 4

Set the generator to a sine wave at 500Hz. Adjust the output to a low level.
3.72V --measured by grid
3.76V --measured by cursors
3.76V --measured by oscilloscope.

Wave 5

Leave the generator at 500Hz. Adjust the output to an high level. Set the generator to a large positive DC offset. Note that with sufficiently high DC offset the waveform seems to be displayed improperly. Specifically, it appears that the oscilloscope does not measure above 13V. As the DC offset is lowered, the waveform returns to a sinusoidal wave.

Triggering

According to Wikipedia, modern oscilloscopes use triggered sweep "to display events with unchanging or slowly changing waveforms, ...[which] may or may not be evenly spaced." There are four types of triggering on the TDS 1002 Digital Storage Oscilloscope: Edge, Pulse, Video, and External.

Edge Triggering

Edge triggering occurs "when the input signal crosses a specified threshold voltage in a specified direction." The TdS 1002 allows you to adjust between rising and falling voltage and to change the level of the threshold.

Pulse Triggering

Pulse triggering occurs

AC Coupling

Set the generator to a 5Hz square wave and adjust the output to an 8.5V amplitude. The fall time was measured to be 59.00ms measured from the peak to 10% voltage using the cursors. Using this value, the calculated RC constant of the oscilloscope is t=26.85.

Acknowledgments

T. Mahony's Oscilloscope Lab Book for page format.
Wikipedia for information on triggered sweeps.

Links

Physics307L
My OWW Page
My 307L Page

@@ Line 37: / Line 37: @@
 ==AC Coupling==
-Set the generator to a 5Hz square wave and adjust the output to an 8.5V amplitude.  The fall time was measured to be 59.00ms measured from the peak to 10% voltage using the cursors. Using the measure function, the fall time was 95ms.
+Set the generator to a 5Hz square wave and adjust the output to an 8.5V amplitude.  The fall time was measured to be 59.00ms measured from the peak to 10% voltage using the cursors. Using this value, the calculated RC constant of the oscilloscope is t=26.85.
 ==Acknowledgments==