English: A graph of PCI pulses transmitted from the Panel switch at the Museum of Communications in Seattle. The positive and negative pulses occur on physically separate leads, but are overlaid on the same graph for simplicity, so the values of the Y axis are not absolute.
This graph was taken with a digital storage oscilloscope. Channel 1 was Tip to ground, and Channel 2 was Ring to ground. It was saved to CSV format, and then graphed using Plot2 for OS X.
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