PASCO EM-8656 AC_DC ELECTRONICS LABORATORY - Manual (Page 58)

54
AC/DC Electronics Laboratory 012-05892A
®
c. Click the “MON” button to begin monitoring data again. Adjust the frequency in the Signal
Generator window as needed to reach the resonant frequency. Record the resonant frequency.
• When the two inputs are in phase, the Scope display in “X-Y” mode will show a diagonal line.
Any phase difference will cause an oval trace.
• XY mode at 40 Hz • XY mode at resonant frequency
11
Click the “STOP” button. Turn off the switch on the back of the power amplifier.
12
Use the LCR meter to measure the inductance of the inductor coil with core, and the capacitance
of the 100
µ
F capacitor. Record these values in the Data Table.
Analyzing the Data
➀
Graph the current (or voltage across the resistor divided by output voltage: V
R
/V
o
) versus the
linear frequency on separate graph paper. (NOTE: The frequency in the Signal Generator window
is the linear frequency.)
➁ Using the resonant frequency found from the Scope display, calculate the resonant angular
freqeuncy and record the value in the Data Table:
ω
res
=
2
πν
res
➂ Calculate the theoretical resonant angular frequency using the following:
ω
res
=
1
LC