Automotive Electronics Practice Test

In a discussion about oscilloscopes, who is correct if Technician A states that an analog scope can store the waveform for later viewing, while Technician B says the trigger level must be set to view a changing waveform?

1. Technician A only

2. Technician B only

3. Both Technicians A and B

4. Neither Technician A nor B

The correct answer is: Technician B only

In this scenario, Technician B is correct because to effectively view a changing waveform on an oscilloscope, it is essential to set a trigger level. The trigger allows the oscilloscope to stabilize the waveform display by determining when to capture the signal based on a specific voltage level. This means that without proper triggering, the waveform will appear unstable or drifting, making it difficult for the technician to analyze the signal correctly. On the other hand, Technician A's assertion that an analog scope can store the waveform for later viewing is not accurate. Traditional analog oscilloscopes do not have the capability to store waveforms; this feature is characteristic of digital oscilloscopes. Digital scopes can capture, store, and display waveforms after they have been acquired, enabling more detailed analysis and manipulation of the data. Therefore, Technician B is correct in emphasizing the importance of setting the trigger level to effectively observe dynamic changes in waveforms.