Oscilloscope basics: The horizontal (X-axis) of a standard oscilloscope display is normally calibrated in units of ________.
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Atime
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Bvoltage
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Ccurrent
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Dfrequency
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Epower
Answer
Correct Answer: time
Explanation
Introduction / Context:Oscilloscopes visualize how electrical quantities vary over time. Recognizing what each axis represents is essential to correctly reading waveforms and timing relationships.
Given Data / Assumptions:
- Standard time-domain operation is assumed (X–Y mode not engaged).
- Vertical axis displays voltage (or scaled quantity via probes).
- Horizontal axis advances at a rate set by the timebase/trigger system.
Concept / Approach:In normal mode, the timebase sweeps a spot from left to right, mapping elapsed time to horizontal position. Triggering repeatedly stabilizes periodic waveforms on the screen for measurement of period, frequency, duty cycle, and delays.
Step-by-Step Solution:
Set timebase (e.g., 1 ms/div).Apply a signal and trigger on an edge.Note divisions along X: each division represents the chosen time increment.Measure intervals (period = divisions * time/div).Verification / Alternative check:Consult any oscilloscope front panel: “SEC/DIV” or “TIME/DIV” controls belong to the horizontal system, confirming the unit is time.
Why Other Options Are Wrong:
Voltage/current/frequency/power: Voltage is vertical in standard mode; current and power require transducers; frequency is derived from the inverse of measured period.Common Pitfalls:Confusing X–Y mode (special case) with normal timebase operation; misreading time/div due to variable persistence or zoom settings.
Final Answer:time