by

Guillermo Rico

gurico@nmsu.edu

Department of Engineering Technology

New Mexico State University

This method requires the use of a signal generator and an analog or digital multimeter.

1. Measure the wire resistance of the inductor under measurement; call it r.

2. Assemble the following circuit using a known resistance R between 100 S and 1 KS. Adjust the generator to a frequency of 2 to 10 KHz, sine wave, and 1.00 volt rms. The voltmeter must be connected across points A and B, that is, reading the voltage from the generator.

3. Move the voltmeter test leads across points C and B and take down the reading; call it x.

4. Substitute your values into the following formula to determine the inductance L.

**CIRCUIT ANALYSIS**

Using voltage division, the output voltage can be expressed as

Let x be the magnitude of the transfer ratio. Then,

If we use a source voltage of 1.00 V, then x will be equivalent in magnitude to the output voltage V

Square root both sides and replace X