EE RC Project

8/20/2019 EE RC Project

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SS iimm pp llee RR CC PP r r oo j jee cc tt f f oo r r tt hh ee EE llee cc tt r r oo nn iicc ss EE xx pp lloo r r ee r r BB oo aa r r dd Revision: March 11, 2011Note: This document applies to REV D&E of the board.

1300 NE Henley Court, Suite 3Pullman, WA 99163

(509) 334 6306 Voice | (509) 334 6300 Fax

www.digilentinc.com page 1 of 8

Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.

This project demonstrates some basic features of the Digilent Electronics Explorer Board. Using just aresistor and a capacitor, the project introduces the Arbitrary Waveforms Generator and Scopeinstruments in the WaveForms software as well as the Bode Transfer Function. To keep the projectsimple for new users, only a few features of the software are used.

To generate an RC circuit step response showing the time domain:

1. Build the schematic above.2. Connect the EE Board to the PC with a USB micro AB cable.3. Connect the board power supply.4. Turn the On-Off switch ON.5. Launch the WaveForms software.


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Simple RC Project for the Electronics Explorer Board



6. When closing, WaveForms stores the last configuration (by default). To restore the factorydefault settings, click Options in the WaveForms main window, then click Erase Configurationin the Options window. Close the Options window.

7. Launch the Arbitrary Waveform Generator (AWG).8. Launch the Scope.9. In the AWG window, set the excitation signal for the RC circuit: Shape = rectangular,

Frequency = 1kHz, Amplitude = 5V, Offset = 5V, Symmetry = 50%, Phase = 0. Click Run All orRun AWG1.

1. openOptions

4. launchAWG

5. launchScope

2. Eraseconfiguration

3. Closeoptions

4. Frequency range Min and Max

1. Basic,Standard

15. Run/Stop

2. enable all

5. Frequency

3. rectangle

slider, drop list, type in,mouse wheel

drop list, type in7. Amplitude6. Amplitude range Min and Max

9. Offset8. Offset range Min and Max

11. Symmetry10. Symmetry range Min and Max

13. Phase12. Phase range Min and Max

14. signal preview


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10. Set the scope for a good view of the excitation and output signals: Trigger Mode = Auto,Trigger Source = Channel 1, Trigger Cond. = Falling, Trigger Level = 5V, Time Position =20us, Time Base = 5us/div, Channel and Channel 2 Offset = -6V, Range = 2V/div. Disableunused channels 3 and 4. Click Run.

11. Note the signals.

Channel 1:

00

0100t for V

t for V V V C in

Channel 2 :

RC t

inC inC eV V V t V 0)(

1. trigger mode 2. trigger source 3. trigger cond. 4. trigger level12. Run/Stop

left-click and drag

left-click and drag

left-click and drag

right-clickand drag

left-clickand drag

right-clickand drag

5. time base

6. time position

8. channel 1 offset

7. channel 1 range

11. disableC3 and C4

9. C2range

10. C2offset


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12. Estimate s RC 7 time constant: a tangent to Vc(t) at t=0 would reach inV at t .


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To generate an RC circuit sine response showing the time domain:

1. Set the excitation signal: Shape = sine, Frequency = 20kHz, Amplitude = 8V, Offset = 0V,Symmetry = 50%, Phase = 0. Click Run All or Run AWG1.

2. Set the scope for a good view of the excitation and output signals: Trigger Mode = Auto,Trigger Source = Channel 1, Trigger Cond. = Rising, Trigger Level = 0V, Time Position = 0s,Time Base = 10us/div, Channel and Channel 2 Offset = 0V, Range = 2V/div. Disable unusedchannels 3 and 4. Click Run.

1. open Measure window

2. add parameter

7. repeat toadd more

parameters

8. open Zoom menu

9. select view type

11. drag bottomcursor up/down

19. time atleft cursor

10. bottomcursor C1 units

16. C2 atright cursor

15. drag leftcursor to C1˜ 0

17. drag rightcursor to C2˜ 0

21. undockmeasurements

window

AmplitudeC AmplitudeC

V V

in

C

12

[deg]3601 Period C

DeltaTime Horizontal

14. C1 at leftcursor

3. select channel

4. expand category

5. select parameter

6. add parameter in list


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3. Note the signals.4. Measure the signal parameters, using the Measurement window and Zoom View.5. Close the Measurement and Zoom windows.6. Open an XY view of Channel 2 versus Channel 1. Open a Spectrum view. Adjust the view

size. In the Spectrum View, change Zoom = 50X

7. Export a View.

zoom

50X

X: channel 1Y: channel 2

right-click and drag

left-click and drag

5. Spectrumview zoom

4. view size

1. XY view 3. Spectrum view

2. select channels

7. choose viewto export

9. formatto export

8. Image

clipboard

11. export to either:

file name

and location

file

10. preview


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8. Measure the amplitudes and compute the phase shift on the XY view:

)2sin()()(

)2sin()()(

ft At V t y

ft At V t x

C C

inin

sin)0()0( C C AV y

C C A y

A y

2)0(2

arcsin)0(

arcsin

2

y ( 0 )

2 A c

2A in


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To generate an RC circuit sine response showing the frequency domain:

1. Launch the Bode Transfer Function.2. Set the Bode Transfer Function for a good view of the RC circuit amplitude characteristic:

Logarithmic 10 mode, End Frequency = 230kHz. Resize the window to get frequency values

for all major grid lines. Click Run.

3. Note the amplitude characteristic.

launchBode

TransferFunction

Bode Transfer Function

21

1

1

1

0

jf

f jf V

V

in

C

3. resize the window

1. mode Logarithmic 10

2. end frequencytype in

4. Run/Stop

kHz f f for dB

f jf V

V

in

C 23

2

13

1

10

0

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EE RC Project

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