An ohmmeter is a device that measures electrical resistance in a circuit. When you have an unknown crossover inductor in the circuit, part of the circuit's energy is being stored in a magnetic field. If you don't know how much energy is being stored in the inductor, you won't be able to get an accurate reading for the circuit's resistance. You can determine the measurement for an unknown inductor by using a mathematical equation for the time constant of a circuit: time constant = R*C, where R is the resistor and C is the capacitor.
- Ohmmeter
- A resistor-capacitor (RC) circuit
- Oscilloscope
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Instructions
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1
Measure the resistor's value with the ohmmeter.
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2
Connect the resistor to the ohmmeter in the circuit.
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3
Measure the time constant of the circuit using the oscilloscope.
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4
Insert your readings into the following equation and then calculate the unknown capacitor's ohms: time constant/R = C. For example, if your time constant is 100 and your resistor's ohm measurement is 20, 100/20 = 5 ohms.
