NAU EE 110 - Intro to Logic Probe and Oscilloscope

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NAME: _________________________________EXPERIMENT 2: Intro to Logic Probe and Oscilloscope (1 week)EE 110 Lab Experiment #2 Fall 2009NAME: _________________________________EXPERIMENT 2: Intro to Logic Probe and Oscilloscope (1 week)The purpose of this laboratory is to provide the student with an opportunity to become familiarwith two key instruments in the EE 110 laboratory that will be used to test digital logic networks.Students will work individually.Figure 1: Logic ProbePART 1 -- Logic ProbeProcedure:1) Get your IDL-800 Digital Trainer and a logic probe from the professor or teachingassistant. You will need to return this equipment to the storage cabinet before leaving the lab.As usual, make use of wires and tools as needed.2) Choose a bench that has a 54622 Mixed Signal Oscilloscope. You will probably need toshare this instrument with the other student who sits at your lab bench. We have 11 ofthese scopes and 12 benches.3) Connect the power leads of the logic probe to the +5V and GND sources on yourproto board. These leads have clips that can attach to the connection posts you may findon your proto board’s power bus. Be sure to connect the RED to +5V, and BLACK toGND.Without these power leads connected properly, your logic probe will not work.Be sure the “TTL/CMOS” switch on the logic probe is in the TTL position. Thisconfigures the probe to respond to TTL voltage levels properly for both HIGH and LOW.(The high and low voltage thresholds for CMOS are different than those for TTL.)The “MEM/PULSE” switch can generally be set according to your needs. The MEMposition invokes a memory function in the logic probe, making it easy to detect shortpulses that you may otherwise miss. For now, use the PULSE setting.4) Place the probe tip as described below and describe what happens.2-1EE 110 Lab Experiment #2 Fall 2009a) Touch the tip to a GND point. What happens? _________________________b) Touch the tip to a +5V point. What happens? _________________________c) Touch the tip to the switch SW 0 output. Operate the switch. What happens?_______________________________________________________________d) Make sure the switch is in the PULSE position. Hold the probe tip on the output ofthe pulse switch A. Operate the switch. Then move the probe to the A complementoutput and operate the switch. Describe what happens.__________________________________________________________________________________________________________________________________________________________________________________________e) Now move the switch to the MEM position and repeat part (d). Describe whathappens. (Hint: To clear the memory indicator, toggle back to PULSE mode and thenback to MEM.)__________________________________________________________________________________________________________________________________________________________________________________________5) Set the function generator on your digital trainer as follows:a) Set the function selector switch to square wave.b) Set the range to the X1 setting.c) Set the frequency knob to the lowest possible value.d) Touch the logic probe tip to the function generator output terminal. If nothinghappens, turn the amplitude knob to the right until something does.What happens? ______________________________________________e) Now gradually turn the frequency knob to the right.What happens? ______________________________________________f) Change the range switch to the X1K setting. Adjust the frequency knob.What happens? ______________________________________________From your observations, what are the advantages of the logic probe?2-2EE 110 Lab Experiment #2 Fall 2009What did you observe are the disadvantages of the logic probe?PART 2 -- Mixed-signal OscilloscopeProcedure1) Turn on the scope. Select source 1 as the only active channel (the “1” button is lit; the“2”, “D7 thru D0”, and “D15 thru D8” are dark).2) Connect the scope probe of channel 1 to the scope’s “probe comp” terminal. Connect theprobe’s ground tip to the ground terminal just above the “probe comp” terminal.3) Select the “Edge” function. Select source 1, rising edge using the buttons below thescreen. The function of each button is shown on the screen above it.4) Press “Autoscale”. You should see a square wave trace on the screen. Adjust thehorizontal scale knob to adjust the timebase. Adjust the source 1 vertical scale knob toadjust the voltage range. Make sure you can see a complete cycle of the waveform, withthe high and low portions shown on the screen. In answering the questions below, be sureto include units.To measure risetime and falltime, you’ll probably have to adjust the horizontal timebase tomagnify the view horizontally.Measure the voltage in the high state: _________ Measure the risetime: ________Measure the voltage in the low state: _________ Measure the falltime: ________Measure the high time, tH: __________________Measure the low time, tL: __________________Measure the period, T: __________________Measure the frequency, f: __________________ (Hint: f = 1/T )Sketch the waveform here: Sketch the magnified rising edge here:5) Now move the scope probe to the output of your trainer’s function generator. Attach theprobe’s ground clip to the GND connection on your proto board. Adjust the functiongenerator to produce a square wave of approximately 1 kHz. Adjust the scope to obtain agood view of a complete cycle of this waveform. Finally, adjust the function generatoramplitude so the high state produces a voltage of about 4 volts.2-3Horizontal Scale = /divVertical Scale = /divHorizontal Scale = /divVertical Scale = /divHorizontal Scale = /divVertical Scale = /divHorizontal Scale = /divVertical Scale = /divEE 110 Lab Experiment #2 Fall 2009Measure the voltage in the high state: _________ Measure the risetime: ________Measure the voltage in the low state: _________ Measure the falltime: ________Measure the high time, tH: __________________Measure the low time, tL: __________________Measure the period, T: __________________Measure the frequency, f: __________________ (Hint: f = 1/T )Sketch the waveform here: Sketch the magnified rising edge here: 6) Now adjust the function generator frequency as high as it will go. Use


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NAU EE 110 - Intro to Logic Probe and Oscilloscope

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