Archive for September, 2011

Guidance Issued on GR-1089-CORE Issue 6 Variance from Issue 5

by on Sep.21, 2011, under EMC, NEBS

Now that Verizon has accepted GR-1089-CORE Issue 6 with exceptions, MET Labs’ Electromagnetic Compatibility (EMC) Department has issued a guidance document that details the variances from Issue 5.  See highlights, following.

(Want a handy cheat sheet that details what can and cannot be grandfathered from Issue 5?  Contact MET and ask for the “Issue 6 Cheat Sheet.”) 

The following tests were removed as part of the revision:

  • Conducted Emission Requirements for Analog Voiceband Leads
  • Equipment Providing or Receiving Remote Power O4-3 and O4-4
  • First Level AC Power Fault – 600V 2.2A, 600V 3A and 1000V 5A Test
  • Second Level AC Power Fault – 600V 2.2A and 600V 60A Test
  • Criteria for Equipment Interfacing With Coaxial Cable Port
  • Voltage Cutoff and Recovery Criteria
  • Singe Voltage Transient
  • Voice Frequency Noise Emission
  • Broadband Noise Emission

Sections 2-3
The following changes were made in Sections 2-3:

  • Radiated emissions e-field (REE) and radiated emissions magnetic field (REH) below 30MHz have been removed
  • Not applicable to wireless devices with the antennas inside the facility
  • Guidelines for changes, GR 209
  • Electrostatic discharge (ESD) warning label is always required
  • Electrical fast transient (EFT) method clarified for racks with cables located on top
  • ANSI C63.4 – 2009 referenced – American National Standard for Methods of Measurement of Radio-Noise
  • Emissions from Low-Voltage Electrical and Electronic Equipment in the Range of 9 kHz to 40 GHz
  • Consolidated testing encouraged, i.e. FCC and ETSI, etc.
  • Include measurement uncertainty in GR1089
  • Additional restrictions on the use of ferrites

Section 5
The following modifications were made to Steady State Power Induction:

  • Specifies loop lengths for xDSL and other OSP interface types
  • Specifies Criteria for Span or Line Powered equipment

Section 7
The following modifications were made to Electrical Safety Criteria Induction:

New Test Criteria Section 7.8  Laser Safety and Labeling Criteria

  • All optical equipment must comply with GR-499, 21 CFR 1040.10, ANSI Z136.1, IEC 60825.2 and local regulations
  • All optical products that contain lasers must contain cautionary labeling

Section 9
The following modifications were made to Grounding and Bonding:

All equipment certified by an NRTL are exempt from the short-circuit test criteria under section 9.10

Customer is to provide full NRTL listed report detailing short-circuit tests performed

  • Embedded Power Sources <15VA are exempt from testing
  • Embedded Power Sources not NRTL Listed and >15VA shall be evaluated to section 9.10

Section 10
The following modifications were made to Criteria for DC Power Sources of the Telecommunication Load equipment:

10.3 Overvoltage (Steady State) as Per ATIS 0600315.2007

  • The EUT shall continue to operate normally with an overvoltage condition at maximum operation voltage for 30 min.

10.4 Overvoltage Transient

  • The EUT must continue to operate normally with a -75V Overvoltage transient that consist of a 10V/ms with a 10ms duration.

10.5 Protective Device Transient

  • This test criterion combines all individual test transients into one section as in ATT TP76200 Document. All test criteria for Overvoltage, Undervoltage and Impulse Transients are the same as previous edition.

10.6 Noise Returned by Telecommunication Load Equipment

  • Changed minimum current requirements from 1A minimum to a 10A minimum.  Equipment <10A will use the new minimum 10A for limit calculation.
  • Changed test setup to add High Impedance Transducer for emission readings

10.8 Marking and Documentation

  • Equipment shall be marked to show intended nominal voltage or voltage range. The marking shall be non-removable and located in a general area where it can be easily visible without moving faceplate, covers or cables.

New Port Types
New port type lists were added:

  • Type 3a/5a Inter Cell Site Cable Port (I.E T1 or Ethernet)
  • Type 3b/5b Short Reach OSP (I.E Ethernet or POE) for definition
  • Type 4a Customer Side ONT and iNIDS  (I.E POTS or Ethernet)
  • Type 8a DC Power to Antenna
  • Type 8b Intra-Cell site DC Power

See Appendix B for definition of the new port types.

Read more about the requirements of NEBS testing or register for complimentary NEBS seminars in Austin, Texas on November 1, or Baltimore, Maryland on November 8.

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ENERGY STAR Undergoes Specification Updates for Televisions, Computers, Displays & Imaging Equipment

by on Sep.14, 2011, under ENERGY STAR

The U.S. Environmental Protection Agency (EPA) is in the midst of updating many ENERGY STAR specifications.  Here is the status of a few key categories:

The effective date of Version 5.3 ENERGY STAR Program Requirements for Televisions is September 30, 2011. Version 5.3 was finalized on January 24, 2011. These requirements establish challenging On Mode power consumption levels, take steps to ensure a TV is viewed in the mode in which it qualified for ENERGY STAR, and curb energy associated with downloading program guide data.

In light of efforts to develop a test method for televisions that implement Automatic Brightness Control (ABC), an energy-savings feature, EPA delayed the release of the Draft 2 Version 6.0 Televisions specification until Fall 2011, with the aim of finalizing the specification by the end of 2011 and having it take effect in Fall 2012.

For ABC, EPA is factoring into the test method the findings from the Consumer Electronic Association’s study of average room illuminance levels in consumer homes. Additionally, EPA is harmonizing its ENERGY STAR television testing requirements with those under development by the U.S. Department of Energy (DOE).

The current ENERGY STAR requirement for computers is Version 5.2.

The ENERGY STAR specification for computers is currently under revision. EPA is kicking off the dataset assembly effort for development of the ENERGY STAR Version 6.0 Computer Specification.  For consideration, data must be forwarded to using the appropriate form by Wednesday, September 14, 2011.

The current ENERGY STAR requirement for displays is Version 5.1.

The ENERGY STAR displays product specification is currently under revision. EPA hosted a webinar on June 22, 2011 to discuss proposed changes to the test method and receive comments on applying IEC 62087 to test all display products. Incorporating stakeholder feedback, EPA released a revised test method, and accompanying documents, for Draft 1 of the Version 6.0 ENERGY STAR Display Product Specification.  

EPA is now considering all test data and comments on the proposed edits in the Draft 1 specification and test method in its analysis for Draft 2. EPA will also propose performance levels for all product types/sizes in Draft 2.

Imaging Equipment
The current ENERGY STAR requirement for imaging equipment is Version 1.1.

The ENERGY STAR specification for imaging equipment is currently under revision. The revised test method is Version 2.0.

There are many other revisions to existing specifications as well as new product specifications in development.

More about ENERGY STAR testing and certification.

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Top 10 Tips for Designing Safety into Electrical Products

by on Sep.01, 2011, under Product Safety

Electrical Source Magazine features an article in its July/August 2011 issue that gives an overview on how to design electrical products to comply with safety standards including UL 60950-1, the safety standard for IT Equipment. “Working by Electrical Standards” was written recently by MET Laboratories Product Safety Engineer Tim Su.

The article describes the safety hazards, and provides preventive actions for each of these hazards. These design tips include:

  1. Own and read applicable standards
  2. Identify the potential hazards: electrical shock, electrical energy, risk of fire, mechanical, heat, radiation or chemical
  3. Choose properly certified and rated components
  4. Design in proper spacing and insulation
  5. Design enclosures taking those hazards into account
  6. Minimize openings
  7. Apply proper markings
  8. Develop a user manual and installation manual that include the proper safety precautions
  9. Maintain a file of data sheets and evidence of safety compliance of critical components
  10. Have your proposed design reviewed by a safety compliance specialist

Preventive design not only protects the end user, but also saves time and money for the manufacturer during the safety certification process.

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