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Embedded Wireless Systems - Laboratory 1 | ECGR 6090, Lab Reports of Electrical and Electronics Engineering

University of North Carolina (UNC) - CharlotteElectrical and Electronics Engineering
Prof. Ivan Howitt

Material Type: Lab; Professor: Howitt; Class: Special Topics: Dyn. and Cont. AC Drives; Subject: Electrical and Computer Engr; University: University of North Carolina - Charlotte; Term: Spring 2009;

Typology: Lab Reports

Pre 2010

Uploaded on 07/29/2009

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Embedded Wireless Systems-
ECGR 3090/6090 Spring 2009
Laboratory I: Equipment Overview
Jan 26, 2009
Pre-Lab Due: 1/29/09
Laboratory Report Due: 2/5/09 at 11:59 PM
LAB PRE-READING:
1. General Notes on the Laboratory Procedure
2. Spectrum Analyzer Overview (SpectrumAnalyzerDoc_v1.pdf)
3. Spectrum Analysis (An Introduction to RF Signal, Noise and Distortion
Measurements in the Frequency Domain) (AgilentLabonSpectrumAnalysis.pdf)
4. Agilent Documentation – available online at http://www.home.agilent.com
Agilent CSA Specifications Guide
Agilent CSA Spectrum Analyzer Demonstration Guide
(AgilentSpectrumAnalyzerOverview.pdf)
GOALS:
Become fluent with the operation of the Spectrum Analyzer and Function Generator
in the Embedded Wireless Lab including:
1. Display and comprehend signals on the spectrum analyzer
2. Understand the resolution bandwidth and its effect on measuring signals
3. General knowledge of markers and using them to assist in making measurements
4. Understand zero span and using it to evaluate signals in the time domain
5. Understand how to setup a test in order to evaluate a signal’s characteristics
PRE-LAB PROCEDURE:
1. Read the pre-reading material carefully
2. Read the lab procedure material carefully & understand terminology. Prior to
performing the lab you should be very confident in the results you will obtain
when performing each experiment. If there is terminology or procedures you do
not understand, reexamine the pre-reading and also look at the Agilent
documentation. (Agilent Documentation is available online at
http://www.home.agilent.com)
3. Provide brief write up concerning the following questions:
a. What is RWB?
b. What is shape factor and provide formula for evaluating?
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Embedded Wireless Systems-

ECGR 3090/6090 Spring 2009

Laboratory I: Equipment Overview

Jan 26, 2009

Pre-Lab Due: 1/29/ Laboratory Report Due: 2/5/09 at 11:59 PM LAB PRE-READING:

  1. General Notes on the Laboratory Procedure
  2. Spectrum Analyzer Overview (SpectrumAnalyzerDoc_v1.pdf)
  3. Spectrum Analysis (An Introduction to RF Signal, Noise and Distortion Measurements in the Frequency Domain) (AgilentLabonSpectrumAnalysis.pdf)
  4. Agilent Documentation – available online at http://www.home.agilent.com Agilent CSA Specifications Guide Agilent CSA Spectrum Analyzer Demonstration Guide (AgilentSpectrumAnalyzerOverview.pdf) GOALS: Become fluent with the operation of the Spectrum Analyzer and Function Generator in the Embedded Wireless Lab including:
  5. Display and comprehend signals on the spectrum analyzer
  6. Understand the resolution bandwidth and its effect on measuring signals
  7. General knowledge of markers and using them to assist in making measurements
  8. Understand zero span and using it to evaluate signals in the time domain
  9. Understand how to setup a test in order to evaluate a signal’s characteristics PRE-LAB PROCEDURE:
  10. Read the pre-reading material carefully
  11. Read the lab procedure material carefully & understand terminology. Prior to performing the lab you should be very confident in the results you will obtain when performing each experiment. If there is terminology or procedures you do not understand, reexamine the pre-reading and also look at the Agilent documentation. (Agilent Documentation is available online at http://www.home.agilent.com)
  12. Provide brief write up concerning the following questions: a. What is RWB? b. What is shape factor and provide formula for evaluating?

c. Sketch the anticipate Spectrum Analyzer display for the following setup – Spectrum Analyzer set up: zero span; RWB = 50Hz; Center frequency 100kHz. Signal into the spectrum analyzer is 90kHz unmodulated carrier. d. Sketch the anticipate Spectrum Analyzer display for the following setup – Spectrum Analyzer set up: zero span; RWB = 50Hz; Center frequency 100kHz. Signal into the spectrum analyzer is on-off keyed (OOK) with a 50% duty cycle with 10ms on time. The carrier frequency is 100kHz. LAB PROCEDURE:

1. Evaluate Spectrum Analyzer’s Reference Signal Key Issues: Resolution Bandwidth (RWB); Measurement Accuracy; Spurious Signals; Harmonics a. Connect the Spectrum Analyzer’s reference signal to the RF input of the Spectrum Analyzer. b. Set the Spectrum Analyzer as follows: Center Frequency to 10 MHz, Span to 1kHz and RBW to 10Hz. c. Place a marker on the peak signal and record the frequency and power of the peak. d. Investigate the following three methods for evaluating the signal displayed on the trace – Average, Min Hold, and Max Hold. Note: Clear Write will return the Spectrum Analyzer back to “normal” mode. Comment on each method. e. Vary the RBW, what is the effect on the signal’s spectrum and on the sweep time. A critical component of understanding how to use a spectrum analyzer well is understanding the trade off on setting the RBW and the impact on the sweep time. f. Reset the Spectrum Analyzer, this is a quick method to set the Spectrum Analyzer to the factory settings. Set the start frequency to 10MHz and the stop frequency to 50 MHz. Observe the harmonics and spurious signals generated by the reference signal. Investigate using different RBW, number of points, etc. in order to characterize the signal’s harmonics and spurious signals. Provide two screen captures: one with the visible

Make sure to explain. Second, turn on the RF Output on the SigGen, make observation. e. Setup the Spectrum Analyzer to provide the best capability of resolving two signals. Then find the minimum frequency separation at which the signals are resolvable. Note: on the SigGen, setting up and using the “Incr Set” key is useful. f. Develop and carry out an experiment for evaluating the shape factor for the 10Hz RBW filter. Provide the details for your experiment (THIS SHOULD BE DONE PRIOR to the LAB) and your results.

4. Zero Span Key Issues: Resolution Bandwidth (RWB); Spectrum Analyzer in Zero Span a. Use the same setup as in Part 3 step c, i.e., two identical signals being combined. Set the Spectrum Analyzer to center frequency of 10MHz and the span to zero, i.e., zero span button. Zero span is a special mode of the spectrum analyzer to evaluate signals in the time domain. b. On the SigGen turn RF off. Observe the output on the Spectrum Analyzer, explain. c. Turn of the SigGen RF signal. Observe the signal. Set the sweep time to capture two to three cycles of the waveform. d. Set the RBW to 3kHz (lowest setting),vary the SigGen frequency from 10MHz to 10MHz + 4kHz in 1kHz steps. Provide screen captures and assessment. Provide mathematical model of what is happening.