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Measuring voltage at a circuit point

This is an important action when checking the circuit performance for analysis or when you repair a circuit/electronic device.

When testing circuits you often need to find the voltages at various points, for example the voltage at pin 2 of a 555 timer chip. This can seem confusing – where should you connect the second multimeter lead?

measure circuit point
Measuring voltage at a point

  • Connect the black (negative -) lead to 0V, normally the negative terminal of the battery or power supply.
  • Connect the red (positive +) lead to the point you where you need to measure the voltage.
  • The black lead can be left permanently connected to 0V while you use the red lead as a probe to measure voltages at various points.
  • You may wish to fit a crocodile clip to the black lead of your multimeter to hold it in place while doing testing like this.
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