On an oscilloscope, which control is used to scale the vertical axis so that the graticule's major/minor divisions can be read directly as a signal's amplitude?

Introduction:
Reading amplitude on an oscilloscope requires the correct vertical scale. Knowing which control sets that scale is essential for accurate, repeatable measurements in the lab or field.

Given Data / Assumptions:

• A standard analog or digital scope with graticule.
• Vertical sensitivity adjustable in steps (e.g., 1 V/div, 2 V/div, 5 V/div).
• We want to convert divisions to volts directly.

Concept / Approach:
The volts-per-division (volts/cm) control sets how many volts correspond to one major vertical division. Multiplying the observed number of divisions by this setting yields the signal amplitude. Other controls do not change the scale in volts per division.

Step-by-Step Solution:
1) Choose a volts/div setting that fits the waveform on screen.2) Count the divisions from zero reference to peak.3) Multiply by volts/div to get peak voltage; apply conversion to RMS if needed.4) Record or compare as required.

Verification / Alternative check:
Scopes often display the current volts/div setting on-screen; changing it rescales the vertical axis immediately—confirming that this control governs amplitude scaling.

Why Other Options Are Wrong:
Time/cm control: sets horizontal time base, not amplitude scale.Position control: shifts the trace vertically; does not change scaling.Intensity control: adjusts brightness only.

Common Pitfalls:
Failing to note the volts/div applied to each channel, leading to misread amplitudes when comparing traces.

Final Answer:
volts/cm control