What do these icons mean?

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The oscilloscope, or scope, is a very useful laboratory tool used to measure voltages as a function of time. The oscilloscope uses a cathode-ray tube (CRT) which can deflect a beam of electrons both vertically and horizontally. When the electron beam impacts the flourescent screen at the end of the tube, a bright spot appears on the screen.

The oscilloscope screen is typically divided into a grid made up of vertical and horizontal divisions. Here is a picture of a typical oscilloscope screen which is divided into xxx vertical and horizontal divisions, or squares. Each division is further divided with four tick-marks, making it easier to measure to 20% of a division.

When an ac voltage is input into the oscilloscope, the beam is deflected up and down depending on the amplitude of the input voltage. The oscilloscope operator can adjust the vertical (voltage) scale by turning the Volts/Division knob to the desired setting. In addition, the operator can adjust Time/Division knob which affects the speed at which the elecron beam sweeps left to right across the screen.

Here is a video of an oscilloscope tracing an ac voltage input. During the video, the operator will gradually turn the Time/Division knob to smaller and smaller time scale values. The input signal is not changing, but rather it is the scope's sampling rate that is increasing, making it appear that the signal frequency is increasing.

• two channels
• dc signals as well
• slow moving dot -- makes a clock
• knobs described
• function generator
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Figure xxx.

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