How to Test PCB Continuity: Simple Steps for Beginners

To test PCB continuity, use a multimeter set to continuity mode and place the probes on two points of the circuit. If the multimeter beeps or shows zero resistance, the connection is continuous; otherwise, it is broken.

Syntax

Testing PCB continuity involves using a multimeter in continuity mode. The basic steps are:

• Set multimeter to continuity mode (usually marked with a sound wave or diode symbol)
• Place probes on two points of the PCB trace or component leads
• Observe the multimeter for a beep or low resistance reading

This confirms if the electrical path is complete.

pseudo

Multimeter.setMode('continuity')
Multimeter.placeProbe('point1')
Multimeter.placeProbe('point2')
if (Multimeter.beep() || Multimeter.readResistance() < threshold) {
  print('Continuity confirmed')
} else {
  print('No continuity')
}

Output

Continuity confirmed

Example

This example shows how to test continuity between two points on a PCB trace using a digital multimeter.

steps

1. Turn on the multimeter and set it to continuity mode.
2. Touch the black probe to one end of the PCB trace.
3. Touch the red probe to the other end of the trace.
4. Listen for a beep or look for a reading close to zero ohms.
5. If beep or low resistance, the trace is continuous; if not, it is broken.

Output

Beep sound or 0.0 Ω reading indicates continuity

Common Pitfalls

• Not setting the multimeter to continuity mode can give wrong readings.
• Probes not touching clean copper pads or leads may cause false no continuity.
• Testing on powered circuits can damage the multimeter or give incorrect results.
• Ignoring solder bridges or shorts that cause false continuity.

pseudo

Wrong way:
Multimeter.setMode('voltage')
Multimeter.placeProbe('point1')
Multimeter.placeProbe('point2')
// No beep, wrong mode

Right way:
Multimeter.setMode('continuity')
Multimeter.placeProbe('point1')
Multimeter.placeProbe('point2')
// Beep confirms continuity

Quick Reference

Step	Action	Expected Result
1	Set multimeter to continuity mode	Multimeter ready to test
2	Place probes on two PCB points	Probes contact clean pads or leads
3	Listen for beep or check resistance	Beep or near zero ohms means continuity
4	If no beep, check connections or trace	No continuity detected
5	Avoid testing powered circuits	Protects multimeter and ensures accuracy

Key Takeaways

Always use a multimeter in continuity mode to test PCB connections.

A beep or near zero resistance means the circuit path is continuous.

Ensure probes touch clean, exposed copper for accurate results.

Never test continuity on a powered PCB to avoid damage.

Watch out for solder bridges that can cause false continuity readings.