PC/CP200 Electronics Lab I

Measuring Continuity

Measuring continuity
with DMM
(continuity test mode)

 caution If the component to be measured is in a circuit, turn off the power to the circuit and discharge any capacitors. Any voltage in the circuit will cause inaccurate readings.
ddm resistance mode
  1. Connect the meter's Red lead to V Ω input.
  2. Connect the meter's Black lead to COM input.
  3. Set the function switch to audible continuity mode, audible continuity test mode, located immediately above the ohmmeter range. After selecting the continuity test mode, touching the two probe tips together should produce a tone.
  4. Place probe tips at either end of the component to be tested. Do not touch the component or the probe tip with your hands as your body's resistance will affect the measurement.
  5. Continuity is indicated by an audible tone.*
  6. Turn the meter off when measurements are complete.

* Meter specifications indicate an audible tone when resistance is ≤ 75Ω.
Measuring continuity
with DMM
(ohmmeter mode)
caution If the component to be measured is in a circuit, turn off the power to the circuit and discharge any capacitors. Any voltage in the circuit will cause inaccurate readings.

dmm resistance mode
  1. Connect the meter's Red lead to V Ω input.
  2. Connect the meter's Black lead to COM input.
  3. Set the function/range switch to Ω (ohmmeter) and select the lowest measurement range, i.e. 200 Ohms.
  4. Place probe tips at either end of the component to be measured. Do not touch the component or the probe tip with your hands as your body's resistance will affect the measurement.
  5. Read the resistance on the display.
    • Open circuits (no continuity) are shown as an overload.
    • Short circuits (continuity) will show as essentially zero resistance.
    • Overload indication is normal in the Ω range.
  6. Turn the meter off when measurements are complete.

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