26-02-2013, 10:57 AM
To Measure Inductance by CRO.
To Measure Inductance.docx (Size: 11.89 KB / Downloads: 25)
APPARATUS:
•Ammeter 1
•Function Generator 1
•Inductor Coil 1
•CRO 1
•Connecting wires
THEORY:
The characteristics of an inductor are dependent on the current and voltage source
excitation signal, wave shape, and frequency of operation, which may vary in real time
operating conditions. Inductance measuring devices typically utilize simulation
techniques, such as subjecting the inductor to a known excitation signal having a
controlled current and voltage source, wave shape, and frequency of operation to measure
the inductance.
One technique for measuring inductance is by oscilloscope. In this method voltage
waveform is obtained on CRO and calculations are performed to find Z. Inductance is
then calculated using following relation.
PROCEDURE:
1. Connect the circuit as shown in circuit diagram.
2. Set the function generator to produce sine wave at a frequency of, say 200 Hz.
3. Note corresponding readings of current and Vp-p in table.
4. Calculate Vmax, Vrms, f, Z and L using formulae.
5. R is obtained by using ohmmeter or multimeter.
6. Repeat the above procedure using different coils.