The fundamental purpose of an oscilloscope is to measure and display voltages as a function of time. A plot of the voltages vs. time is provided in the main waveform window of the oscilloscope. The horizontal axis of the waveform window is time, and the vertical axis is voltage. The user can control the waveform display by adjusting these axes. We will provide basic ways to control these axes below.
Figure 1 shows the basic features on the Analog Discovery™ oscilloscope relative to the horizontal (or time) axis of the oscilloscope's waveform plot. On Fig. 1, controls that are not directly related to the time axis have been “grayed out” to de-emphasize them. The primary time axis controls consist of setting the sensitivity (the scale used on the horizontal axis) and the location of the trigger point on the time axis. Primary horizontal axis controls are as follows:
Figure 2 shows the basic features on the Analog Discovery oscilloscope relative to control of the vertical (or voltage) axis of the oscilloscope's waveform plot. As before, controls not related directly to control of the time axis have been “grayed out” to de-emphasize them. One important thing to note about the vertical axis settings is that each channel has its own vertical scale.
If multiple channels are displayed simultaneously, it is imperative that the user keep in mind the fact that the vertical scales on each channel can be different. The scale associated with the selected channel (chosen by clicking on the tabs at the upper left of the main oscilloscope window) is shown on the vertical axis. This scale may not be appropriate for any of the other channels displayed!
Primary vertical axis controls are as follows for each channel. (For clarity, these controls are illustrated for only channel 1 in Fig. 2. Similar controls will appear for any other enabled channel.)