If you have a reason to believe that testing will degrade your assembly, then you may want to perform some confirming tests and make use of a provision of the test section that requires electrical tests on good assemblies to not degrade reliability. Will these test voltages damage them? Further details of these changes can be found at the bottom of this page. This means that the measured resistance starts lower and trends higher over time. The same maximum-allowable current threshold is used throughout the test time. These activities offer seemingly endless education and networking opportunities that impact your career and company by providing you the knowledge, technical skills and best practices to address any challenge you face. The User has the ultimate responsibility for identifying the Class to which the assembly is evaluated.
If the User and Manufacturer do not establish and document the acceptance class, the Manufacturer may do so. Coverage is given to adhesion, material qualification, resistances to solvents, and electrical requirements. The control device includes a device for detecting the actual winding diameter of the collection reel and a device for adjusting the rotation speed of the collection reel according to the actual winding diameter of the collection reel. In addition, the energy levels are very low test current is measured in mA and performed under room temperature conditions. These are rather small creepage distances. What changes were made between A-620 Rev A and A-620 Rev B? Changes in the mechanical structure and various hardware options are available even on small quantities to meet the customer applications. .
Establishes the requirements for the evaluation of liquid and dry film solder mask material and for the determination of the acceptability of use on a standard printed board system. Use of this standard requires agreement on the classes to which the product belongs. Shouldn't they both be minimum times? Class 3 - High Performance Electronic Products Includes products where continued performance or performance-on-demand is critical, equipment downtime cannot be tolerated, end-use environment may be uncommonly harsh, and the equipment must function when required, such as life support systems and other critical systems. Typically, the end-use environment would not cause failures. In Class 2, just as in Class 3, small creepage distances can justify a reduction in the voltage applied for the high voltage test. Defining Cable Tests and Test Level requirements The Test Section uses three product classes, as defined in section 1.
The costs of the testing should not increase when the voltage needs to be reduced. The device for rotationally driving the still empty reel and the device for feeding the still empty reel to the contact roller can act simultaneously on the still empty reel. The A-620 describes requirements for assemblies based on visual criteria. Professionals from around the world come together to participate in the Technical Conference, Exhibition, and Professional Development, Standards Development and Certification programs. An apparatus for winding an elongated element onto a collection reel with the interposition of a service fabric, includes a device for feeding the elongated element toward the collection reel, a device for feeding the service fabric toward the collection reel, a device for. This test must continue for some minimum time. Revision C also has over 700 full color pictures and illustrations.
It also sets expectations between customers and suppliers for the level of quality expected. In this way it provides a way to train factory floor people. You can purchase the current version A-620 Rev B at or What Has Happened with Cable Testing in A-620? Typically, the end-use environment would not cause failures. Class 2 - Dedicated Service Electronic Products Includes products where continued performance and extended life is required, and for which uninterrupted service is desired but not critical. In 2011, Cirris helped propose changes to the test section for the next edition of the A-620 standard Rev B released in October of 2012. It is an important piece to the process, materials, and inspections standard for the cable and wire harness industry. Professionals from around the world come together to participate in the Technical Conference, Exhibition, and Professional Development, Standards Development and Certification programs.
Detailed pictures communicate acceptable and unacceptable features of an assembly. If you become aware of research that supports the fear of degrading insulation in wiring or connectors with the short-term application of high-voltage, we would deeply appreciate knowing of it. Any method that produces an assembly conforming to the acceptability requirements described in this standard may be used. I have insulated wires or connectors with a specified maximum working voltage that is lower than those required in the A-620 test specification. The solid steel housing meets industrial environmental requirements.
This question most often arises from those doing work under military contracts where interpretations for different requirements may conflict. When tested, the voltage used is in the thousands of volts. If the User does not establish and document the acceptance Class, the Manufacturer may do so. This information is intended to help guide you in understanding why specific tests and their required parameters are needed. Revision E incorporates requirements for flexible cover materials used as a flexible dielectric protective layer over etched conductors and other conductive features. None of the information on this page is a substitute for having a copy of the A-620 Rev B standard. These activities offer seemingly endless education and networking opportunities that impact your career and company by providing you the knowledge, technical skills and best practices to address any challenge you face.
Changes in the mechanical structure and various hardware options are available even on small quantities to meet the customer applications. Am I caught in a double bind where these required test voltages are considered destructive and render the assembly unusable for service? Conductive connector shells and unused contact positions shall be included where a risk of a short exists. Even wire for industrial and commercial applications is usually tested in the manufacturing process. Longer times have better chances of detecting faults. The A-620 requirements specify that electrical tests should operate at such levels as not to degrade the electrical properties. As a guide, you can see what problems you might encounter with your particular creepage distance using the.