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Oscilloscope basics: The horizontal (X-axis) of a standard oscilloscope display is normally calibrated in units of ________.

Difficulty: Easy

time
voltage
current
frequency
power

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.

Oscilloscope basics: The horizontal (X-axis) of a standard oscilloscope display is normally calibrated in units of ________.

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