ECE 206Lab: Oscilloscope and Signal Generator Use

ECE 206Lab: Oscilloscope and Signal Generator Use

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Laboratory Goals

 Familiarize students with the oscilloscope

 Familiarize students with the function generator

 Apply a signal to a resistive circuit and measure both input and output signals

 Save a digital copy of the oscilloscope screen to a diskette/file or thumb-drive.

Pre-lab / lab reading

 Agilent 33220A 20 MHz Function/Arbitary Waveform Generator User Guide

From this page select the Manuals(8) Link on the left under By Type of Content.

It should be the third item in the list.

 3000X- Series Oscilloscopes User’s Guide, English (or language you want) published by Agilent Technologies,. (Copies of this reference book are available in the lab, or at the website)

Second Link under Manuals on left column under Key Product Information.

for the user guide of the DSOX3052A

 For the DSOX3032T user manual, User’s Guide for InfinitVision 3000T X-Series Oscilloscopes, find the second link under Manuals about 1/2 way down the left side of the page.

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Equipment needed

 Lab notebook, pen

 Agilent/Keysight DSOX3052A Digital Storage Oscilloscope or

 Agilent/Keysight DSOX3032T Digital Storage Oscilloscope

 Agilent/Keysight 33220A Function/Arbitrary Waveform Generator

 2 oscilloscope probes

 1 BNC/EZ Hook test lead

Parts needed

 Circuit Prototyping breadboard/ELVIS

 Resistors (2), 1.5k Ohm, ¼ Watt

Lab safety concerns

 Make sure before you apply an input signal to a circuit, all connections are correct, and no shorted wires exist.

 Do not short the function generator signal and ground connections together.

 Do not touch the circuit wiring while power is applied to it.

1. Exploring the Oscilloscope

 Locate the Digital Oscilloscope and obtain two scope probes.

 Press the white POWER button to turn on the oscilloscope on the lower left of the front panel. See 1 in Figure 1: Oscilloscope Controls.

 Press the [Help] button. Familiarize yourself with how the controls are changed using the dials, buttons, or softkeys. The [Help] button is in the lower right of the manual controls area. See 2 in Figure 1: Oscilloscope Controls.

 Press the Default Setup to return the oscilloscope to the default state (Always use the default before you begin using the oscilloscope!) See 3 in Figure 1: Oscilloscope Controls

 Connect the two probes to their input connectors, marked as 1 or X and 2 or Y on the Scope. See 4 in Figure 1: Oscilloscope Controls.

 Clip the channel 1 (CH 1) probe to the Probe Comp test point at the lower right below the display. The probe tip goes to the Probe Comp (5). See 5 in Figure 1: Oscilloscope Controls.

 Clip the probe’s ground clip to the oscilloscope ground connection to the right of the Probe Comp test point. The ground clip goes to the horizontal grounding strip (6). See 6 in Figure 1: Oscilloscope Controls.

 Press the Auto-Scale button to acquire the test waveform (i.e., a square wave). See 7 in Figure 1: Oscilloscope Controls.

 Change the vertical scale of the waveform using the CH 1 Volts/Division knob that is just above the 1, illuminated channel activation button. See 8 in Figure 1: Oscilloscope Controls.

 Note the Vertical Scale Readout changing in the upper left of the screen and the displayed waveform changing size as the knob is adjusted. See 1 in Figure 2: Oscilloscope Screen.

 Change the horizontal scale of the waveform using the Sec/Division knob, left most, top most knob. See 9 in Figure 1: Oscilloscope Controls.

 Note the Horizontal Scale Readout changing as the knob is adjusted. See 3 in Figure 2: Oscilloscope Screen

 Press the Auto-Scale button again to resize the waveform

 Press the [Meas] button.{ See 10 in Figure 1: Oscilloscope Controls.} The Frequency and peak to peak voltage of channel 1 automatically appears in the window to the right of the signal window on the display.{ See 4 in Figure 2: Oscilloscope Screen.} Additional measurements for selection can be found using the lower soft keys under the Screen. The [TYPE] button .{ See 5 in Figure 2: Oscilloscope Screen.} will produce measurements window on the display, it has a scroll control knob on the right of the screen for selection {See 6 in Figure 2: Oscilloscope Screen}

 To remove a measurement from the Meas window, use the [Clear Meas], {See 7 in Figure 2: Oscilloscope Screen} Follow the other soft keys that appear.

 Record the frequency and peak-to-peak voltage (Vpp) of the square wave in your lab notebook

 Unclip the CH 1 probe and ground clip from the oscilloscope test point and set them aside

 Clip the channel 2 (CH 2) probe and ground clip to the Probe Comp and ground connections respectively

 Repeat the frequency and amplitude measurements for the CH 2 waveform

 Clear the screen measurements as before.

 Unclip the CH 2 probe and ground clip from the oscilloscope, and set them aside

Always test both probes before taking measurements with them! The test signal from the oscilloscope should appear square and symmetrical, with no rounding.

Figure 1: Oscilloscope Controls

Figure 2: Oscilloscope Screen

2. Exploring the Function Generator

Putting the Function Generator in a known configuration state:

Refer to Figure 3: Function Generator Controls.

 Locate the Agilent 33220A 20 MHz Function Generator

 Press the white Power button to turn ON the generator. See 2 in Figure 3: Function Generator Controls.

 Press the [Store/Recall] button to select a stored setup. See 4 in Figure 3: Function Generator Controls.

 Press the [Set to Defaults] soft-key, then the [Yes] soft-key that appears. See 1 in Figure 3: Function Generator Controls.

Selecting an output waveform:

 You can select a waveform by pressing the button with the corresponding symbol and text button, (sine, square, triangle, or ramp):

• Press the [Square] wave button (notice the square wave symbol appears on the right side of the display at the Waveform Indicator) See 3 in Figure 3: Function Generator Controls.

 You can set the frequency two ways:

• Direct entry for 33220A, See 1 and 9 in Figure 3: Function Generator Controls.
• Press the Freq/Period softkey until the desired function is in reverse video(white background dark letters)
• Then press the number buttons for digit entry
• Press the (units) multiplier prefix softkey along the bottom of the display.

• Dial entry for 33220A, See 1, 6, & 8 in Figure 3: Function Generator Controls.
• Press the Freq/Period softkey until the desired function is in reverse video(white background dark letters)
• Highlight the digit to be changed with the unmarked right left keys below the adjusting knob on the right side of the front panel.
• Turn the Adjusting Knob until the desired number appears on the Display.

 On the 33220A, you select the amplitude by pressing the Ampl softkey until highlighted, then use the above described method for Frequency selection to set the value.

 Set the function generator to output a sine wave having a frequency of 455kHz and an amplitude of 1.2Vpp

 Press [Output] button to turn on and off the generator output – Button toggles. See 5 in Figure 3: Function Generator Controls.

 If the signal output is not measured at 1.2 Vpp but closer to 2.4 Vpp then the output circuit of the function generator must be setup.

• See 10 & 1 in Figure 3: Function Generator Controls.
• On the Agilent 33220A Function Generator
• Press [Utility]
• Press 3rd soft key “Output Setup”
• Press 1st soft key “Load/High Z” If in High Z the display box is empty. If output resistance is set to 50 Ohms (or other) this value appears in the display box.
• Press [Done]
• If the output displayed is now 2.4 Vpp then readjust to 1.2 Vpp.

Figure 3: Function Generator Controls

 Connect the BNC end of the BNC/EZ Hook test lead to the function generator OUTPUT. (The BNC connector requires you to push, then gently twist the connector clockwise to lock it on the generator’s connector)

 Connect the red EZ Hook ends of the test lead to the channel 1 Scope probe input.

 Connect the black EZ Hook ends of the test lead to the channel 1 Scope probe Ground.

 Press the Output button on the Function Generator.

 Press the Auto Scale button on the oscilloscope.

 Check that the sine wave is 1.2 Volts Peak to Peak on the oscilloscope screen.

3. Circuit Construction and Signal Measurement

 Construct the two-resistor circuit as shown below in Figure 4: Voltage Divider Circuit with the Input Signal Connected. Be sure to construct a schematic of the circuit for the lab report. Use Multisim.

 Connect the BNC end of the BNC/EZ Hook test lead to the function generator OUTPUT. (The BNC connector requires you to push, then gently twist the connector clockwise to lock it on the generator’s connector)

 Connect the red and black EZ Hook ends of the test lead to the circuit input and ground connections respectively as shown below in Figure 4.

Figure 4: Voltage Divider Circuit with the Input Signal Connected

 Clip the CH 1 oscilloscope probe to the circuit input

 Clip the CH 1 ground clip to the circuit ground

 Clip the CH 2 oscilloscope probe to the circuit output

 Clip the CH 2 ground clip to the circuit ground

 Press the Auto-Scale button to acquire the two waveforms

 To display Measurement data from both channels, you must first:

• For the 3032T
• Press the [Meas] (3032T/52A) button as described earlier.
• Channel 1’s Vpp automatically appears in the “Measurement” window on the right side of the display
• To display channel 2’s Vpp, Press the Source 1 soft-key button at the bottom left of the display and select “2” from the popup menu with the Select knob.
• Press the [Type] soft-key button and “Peak-Peak” under Voltage from the pop up menu. The Channel 2 Peak to Peak Voltage measurement should appear below the Channel 1 Peak to Peak Voltage.

 Record the Peak to Peak values in your lab notebook

 Create a copy of the oscilloscope screen and system settings using the Save/Recall button

• On the 3032T/3052A
• Insert a Thumb-drive (Flash-drive, or memory stick) in the USB connector to the left of the Probe Comp terminal. A “USB device installed” message will appear at the top of the screen. See 11 in Figure 1.
• Press Save/Recall Button. See 12 in Figure 1.
• Press the Save soft button on the bottom-left of the display
• To change to “Format PNG image”, press it again to activate the selection menu. Select ‘PNG-24 bit image (*.png)” from menu.
• To change the name of the file, press the File Name soft button, third button from the bottom-left. Then the File Name button (different button same name. The Select Knob selects letters from the onscreen keyboard)
• Press the “Press to Save” soft button on the bottom-right of the display. Wait for the File Saved Successfully message.
• Remove the USB drive.

 Insert the USB into a computer and view the image. Note all the information that is available in the image.

 Experiment with any other features of the oscilloscope you choose!

 Record your observations in your lab notebook

 Turn off the equipment, then unclip all connections to the circuit.

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Before leaving the lab, take a few minutes to make sure all equipment and test leads are returned to your cabinet, and that you have cleaned up your work space.

4. Analysis

The summary report for this lab is written after completing both Oscilloscope Labs. Organize you notes, calculations, and measurements from this lab so they will be available for the report after the next lab.

Updated: DR Modisette, 09-28-2017, for new scopes (DSOX3000 series)