Circuit Lab.

Experiment-3

Operating the function generator and digital

oscilloscope

Quiz

• A(t)=5.sin(100t)

–Draw the graphic of A(t) signal

–Calculate amplitude, frequency and time period.

FUNCTION GENERATORGW INSTEK SFG-2120

-Generation of Test Signals

-Square Wave

-Sine Wave

-Triangular Wave

-Digitally Controlled Frequency (0.1 Hz ... 20 MHz)

-Manually Controlled Amplitude (0...10V (pp))

-50 ohm BNC output

-TTL/CMOS BNC output

-Counter BNC input for frequency counter

-Amplitude, Frequency Modulation, Variable Mod. index

FUNCTION GENERATORGW INSTEK SFG-2120

FUNCTION GENERATORGW INSTEK SFG-2120

How can we see the signal?

• Oscilloscope GW Instek GDS 1102

100 MHz 2 channels 1 M ohm input impedance FFT, A*B, A+B, A-B Digital Measurements (Vpp, Vdc, Frequency...) Saving Graphical Data (SD Card Interface)

DIGITAL OSCILLOSCOPEGW Instek GDS-1102

Connection

• BNC Connectors (RF Connector) (British Naval Connector)

Cable• RG-58/U Coaxial Cable

• Low-power signal and RF connections

• Characteristic impedance: 50 ohm

A: outer plastic sheath

B: woven copper shield

C: inner dielectric insulator

D: copper core

Oscilloscope Probe

Equivalent Circuits1x Probe

R1=1M ohm

C1=1-10 pF

10x Probe

R1=9M ohm

C1=1-10pF

Oscilloscope

Input

R2=1M ohm

C2=20 pF

Osilloscope Probe Test

• Check the probe set : 1x or 10x

• Connect the BNC connector of the Oscilloscope Probe to CH1

• Connect the test connector of the oscilloscope probe to Test Output

• Press Run/Stop Key

• Measure the frequency and the amplitude of the test signal

Osilloscope Probe Compensation

Volt Division

of CH1

Volt Division

of CH2Time

Division

1st Job:

• A(t)=5.sin(100t)

– Amplitude? • peak (p)• peak-to-peak (pp)

– Time period? (seconds)

– Frequency? (Hertz)

2nd Job

• Derive the sine signal using

function generator and oscilloscope

3rd Job

• Generate

–4 V (p-p)

–10 kHz

–Square Wave

4th Job

• Generate

–100 mV (p-p)

–1 kHz

–Sine Wave

Cursors