Download lab 1 - filters

WLS 501
NAME:
lab 01
Winter 2011
Student Number:
Introduction to low pass and high pass filters
Objective:
To study the characteristics of passive low pass filters and passive
high pass filters.
Equipment and components required:
Signal generator
Capacitors with different range of values
Resistors with range of values
Connecting cables
Oscilloscope and connecting leads
a)
Low Pass Filter with cut-off frequency of 30 KHz
Draw RC circuit to show low pass filter
Select an appropriate capacitor value between 1 nF and
20 nF
Value of Capacitor Selected:
Calculate the Value of Resistor required so that cut-off
frequency for the low pass filter is 30 KHz
Use the formula:
fc = 1/(2RC)
Calculated value of the Resistor:
Select the closest value of the resistor (make sure that
the calculated value is practical value like 300 Ohms or 1
KOhms or 10 KOhms etc.:
Connect the RC Low Pass Filter Circuit
Turn the Signal Generator On and set the frequency to 1000
Hz. Set the peak-to-peak voltage as 1 Volt. For all values of
WLS 501
NAME:
lab 01
Winter 2011
Student Number:
frequencies given below, make sure that the voltage is kept
at 1 Volt peak-to-peak.
Fill in the following table:
Frequency
1000 Hz
10000 Hz
20000 Hz
22000 Hz
23000 Hz
24000 Hz
25000 Hz
26000 Hz
28000 Hz
29000 Hz
29200 Hz
29400 Hz
29600 Hz
29800 Hz
30000 Hz
31000 Hz
32000 Hz
33000 Hz
b)
Vin
Vout
Vout/Vin
dB
RC High Pass Filter with cut-off frequency of 1 KHz
Draw RC circuit to represent high pass filter
Select an appropriate capacitor value between 1 nF and
20 nF
Value of Capacitor Selected:
WLS 501
NAME:
lab 01
Winter 2011
Student Number:
Calculate the value of Resistor so that cut-off frequency for
the high pass filter is 1 KHz
Use the formula:
fc = 1/(2RC)
Calculated value of the Resistor:
Select the resistor having closest practical value:
Connect the RC High Pass Filter Circuit
Turn on the Signal Generator and set the frequency to 100
Hz. Set the peak-to-peak voltage as 1 Volt. For all values of
frequencies given below, make sure that the voltage is kept
at 1 Volt peak-to-peak.
Fill in the following table:
Frequency
50 Hz
100 Hz
200 Hz
300 Hz
400 Hz
500 Hz
600 Hz
700 Hz
800 Hz
900 Hz
950 Hz
960 Hz
970 Hz
980 Hz
990 Hz
1000 Hz
1100 Hz
1200 Hz
Vin
Vout
Vout/Vin
dB
WLS 501
NAME:
lab 01
Winter 2011
Student Number: