Measurement Journal Issue 6

Frequency spectrum versus time 60 40 20 0 dBv -20 -40 -60 -80 -100 -120 0 60 120 180 240 300 360 420 Hz Figure 3. A THD signal, showing its variation of distortion with time Series 1 Series 6 40 to 60 20 to 40 0 to 20 -20 to 0 -40 to -20 -60 to -40 -80 to -60 -100 to -80 -12 to -100 480 540 600 660 720 780 840 900 Conclusion The Agilent 34411A enhanced-performance DMM provides users with the ability to monitor the testing of remote sites from a central location. It can be used to not only calculate THD, but also to display the waveform, its frequency spectrum and the amplitudes of the individual harmonics. The development of this type of application is an innovative use of networking and measurement automation in the deployment and maintenance of widely-distributed, electrical-power generation and transmission systems. It also demonstrates the true ﬂexibility of modern LAN-based (LXI) instrumentation. When coupled with application-speciﬁc software, such instrumentation provides a powerful solution for the monitoring and control of electricalpower requirements. This solution goes beyond simply providing the proper voltage and sufﬁcient current to also providing the proper shape of the voltage waveform — a critical speciﬁcation in verifying that power quality is within an acceptable range. References 1. IEEE Std519-1992, IEEE Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems, June 2004. Powering the 2008 Olympic Games As China prepared for the Summer Olympics, it had to ensure a safe and stable supply of electricity to stadiums and arenas. Prior to the Games, Beijing Municipal Electric Power Corporation projected record power consumption of 14.6 million kilowatts when event demand added onto the city’s summertime peak in electric consumption. The problem was that Beijing had a maximum power supply of just 52 million kilo-volt amperes (KVA). To address the shortfall, Beijing invested roughly US$3.05 billion (22.1 billion yuan) in network upgrades. Completed on January 1, 2008, the 18-month Beijing State Grid’s “0811” project encompassed, among other things, an Olympic project, a state-grid safety project and a stategrid emergency contingency project. Existing equipment and technology were employed in the state grid to safely, and in a stable manner, handle extreme heat and humidity, rainstorms and other severe weather conditions. The “0811” project added 70 additional 110-KV transformer substations to the power grid, bringing the total to 337 and increasing power-supply capacity by 33 percent. The grid reached a reliability rate of 99.9382 percent in the city and 99.795 percent in the countryside. With a maximum power supply of 68.9 million KVA, the city was able to reliably supply enough power to meet total demand during the Olympic Games. Agilent Measurement Journal 50

Table of Contents Feed for the Digital Edition of Measurement Journal Issue 6

Measurement Journal Issue 6 Using a Few Words to Convey a Deeply-Held Spirit Charting a Unique Path to Technology Innovation Contents Announcing First Commercial GC/MS Metabolites Library Assessing Nonlinear Behavior Testing Combines Form and Function Testing Multiplay Networks Higher Sensitivity LC/MS Easing Military Radio Test Stepping Up Calibration Accuracy Increasing Spectrum Analyzer Bandwidth 3GPP Tool Supports TS 36 Standards The Olympic Story Spotlights Agilent's Continuing Contribution to Technology Innovation Ensuring a Level Playing Field in Competitive Sports GPS: Coming of Age Resolving Design Issues in HSPA Mobile Devices Achieving Accurate Results with Oscilloscope-Based Jitter-Analysis Software RF Handheld Testers Guarantee Traffic Stability Under Olympic-Sized Stress Conditions Utilizing LAN-Based Instrumentation to Measure Total Harmonic Distortion in Remote Facilities IMT-Advanced: 4G Wireless Takes Shape in an Olympic Year EPO Doping: A Speed Engine, Turbo-Charged by Chemistry

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