How to Troubleshoot Circuits Using Oscilloscopes

Electric and electronic circuits can be found in many devices used in everyday life. However, when an electric or electronic circuit fails, it can be difficult to determine what caused the failure, especially if the circuit is complex.

An electronic device known as the oscilloscope is a handy tool for troubleshooting problems with electric and electronic circuits. This device measures voltage and frequency, which allows a user to test both AC and DC circuits.

Things You'll Need

• Electric or electronic circuit
• Oscilloscope

Instructions

1. Calibrate the oscilloscope by placing the test lead on the ground coupling (a small metal ring on the front of the oscilloscope). Adjust the vertical position knob so the line on the display screen is centered on zero volts. Adjust the voltage division knob to display voltage in proper increments, such as one division equals five volts. Remove the probe from the ground coupling.

2. Apply electrical power to the circuit. Place the probe at each component electrical connection and read the oscilloscope output screen to verify proper voltage and frequency, if troubleshooting an AC circuit. Continue probing along the circuit until the problem component is found. Turn off the power to the circuit and replace the problem component.

3. Recalibrate the oscilloscope as in Step 1. Reapply power to the circuit. Test each electrical connection to verify proper circuit operation.

References

• Oscilloscope Tutorial and Introduction
• Digital Storage Oscilloscopes: TDS1000B and TDS2000B Series