Conformity Magazine - November 2007 - (Page 19)

under less frequently encountered severe lightning and ac power fault stress. Lightning and AC power fault tests are conducted in Level I and performed according to applicable criteria in GR-1089-CORE. System-Level Electrostatic Discharge (ESD) and Electrical Fast Transients (EFT) The ESD and EFT tests reference applicable GR-1089-CORE electrostatic discharge and electrical fast transient criteria. Electrostatic discharges and electrical fast transients can cause battery management system errors and physical damage to system devices. ESD and EFT testing is critical to assessing overall battery safety. ESD is a Level II test and EFT is an objective. Section 4.6 Mechanical Criteria Lithium battery mechanical safety tests are described here. There is one mechanical safety test in Level I, two mechanical safety tests in Level II, and three mechanical safety tests in Level III, as detailed below. Section 4.6.1 Handling Resistance Criteria The Level I handling resistance testing evaluates a battery’s ability to resist damage and operate following GR-63-CORE packaged and nonpackaged shocks. For compliance, any damage or physical deterioration is required to be limited to that which would not impair proper installation or operation of the battery. When tested, batteries are charged to the manufacturer’s normal shipping state of charge (SoC). Section 4.6.3.1 Earthquake and Section 4.6.3.2 Transportation Vibration Level II earthquake and transportation vibration testing analyze the equipment’s operational robustness during Zone 4 severity earthquakes, normal central office vibrations, and following vibrations that may be encountered during transportation. For compliance, the battery is required to meet the physical performance and functional criteria detailed in GR-63-CORE. Section 4.6.1.2.2 - 16-Foot Free-Fall Shock The Level III 16-foot free-fall shock test is an attempt to simulate batteries accidentally dropped during CEV installation or maintenance. During installation or maintenance, network personnel can be at the bottom of the CEV awaiting the controlled lowering of new or replacement batteries. There can be situations where control is lost and the battery falls. The impact of the fall can shift internal components and cause the battery to become unsafe to network personnel and the infrastructure. Batteries under test are unpackaged and charged to the manufacturer’s normal shipping SoC. Batteries are required to not explode or ignite but are permitted to vent or leak. The 16-foot drop test setup is shown in Figure 4. Section 4.6.2 Crush The Level III crush test simulates abuse that can take place during battery transportation to, from, or within an enduser’s facility. Crushing is typically caused when warehouse personnel operate vehicles, such as forklifts or other powered industrial trucks to transport batteries. At times, either due to inadequate lighting or warehouse noise, the battery can be slowly crushed against a wall until the forklift or truck operator realizes the situation. Figure 4: An illustration of the 16-foot free-fall shock test NOVEMBER 2007 CONfORMity 19 http://www.amphenol-aerospace.com http://www.amphenol-aerospace.com/filtercatalogs http://www.amphenol-aerospace.com http://www.amphenolcanada.com

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Conformity - November 2007 Contents Editor’s Note Commission Sets Date, Terms for 700 MHz Auction FCC Reaffirms Roaming Obligations Commission Moves to Improve USF Management FCC Proposes Fines for Violations of E911 Handset Requirements Commission Levies $1 Million Plus Fines for Unsolicited Fax Advertisements GR-3150 - Lithium Battery Certification Levels Based on Criteria for General Product, Safety, and Performance, Part 2 ESD Open Forum Machinery Field Evaluation for the United States Validation, Verification, and Immunity Testing Techniques for EMC for Functional Safety Thermal/EMC Simulation Addresses New Mechanical Design Challenges Product Safety Equipment Buyer’s Guide FCC Releases Report on Telephone Numbering Resource Utilization Canada Still Has PCS Spectrum to Assign Updated Standards List for the EU’s Medical Devices Directive Updated Standards List for EU Directive on Active Implantable Medical Devices Call for Papers for the 2008 EOS/ESD Symposium Announced Mobile Phone Use in Hospitals May Be Dangerous CPSC Actions in the News IEC Standards Update UL Standards Update Telcordia Standards Update From Our “You Can’t Make This Stuff Up” Department Product Reviews Looking Back: Items from Past Issues of Conformity Upcoming Events Advertisers

Conformity Magazine - November 2007

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