Core Practical: Using an Oscilloscope

Lesson 1 of 1

Finding frequency from the time base

A tuning fork hands you a sound of pure, known-shape frequency. Display it on an oscilloscope, count the divisions spanned by one complete cycle, convert with the time-base scale to get the time period, and the frequency follows from f = 1/T — then repeat for forks of different frequency.

What you know already

This core practical turns the oscilloscope from a display into a measuring instrument. A tuning fork supplies a pure note, the time base supplies the ruler, and one counted cycle plus f = 1/T supplies the frequency — repeated across forks to map period against frequency.

Key points of understanding

• The independent variable is the frequency of the tuning fork used and the dependent variable is the measured time period.
• The microphone detects the fork’s note and the oscilloscope displays the wave electronically.
• The time base is adjusted until multiple complete waves fit on the screen.
• One complete cycle is measured in divisions and converted to seconds with the time-base scale.
• Frequency is calculated from f = 1/T and the measurement is repeated for a variety of forks.