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News

Overview of High-Reliability Cables

Author: Date:12/15/2019 5:59:57 PM
   As industrial and aerospace applications increasingly rely on electronic equipment, manufacturers of RF / microwave cable assemblies must expand cable products capable of meeting high reliability standards under a variety of environmental and operating conditions. Areas involved in such high-reliability components include space technology, test and measurement, wireless mobile communications, automotive, medical, and industrial applications. Unfortunately, the definition of high-reliability coaxial cables varies widely in different industries: there are also differences in the judgment of reliability standards and the range of acceptance conditions for reliability in the commercial sector, the automotive industry, the United States and the European Union, which causes When you need to compare cables or equipment from a "high reliability" perspective, it can be overwhelming.

 

Industry Standard

 

   The benchmarks written by industry standards point to the "minimum specifications" of components and the "minimum level of performance" that the system can provide for cable assemblies. On this basis, manufacturers must produce high-quality cables due to industry competition considerations, in order to surpass the current industry standards in performance indicators, so as to obtain relative product advantages. In other words, on the one hand, industry standards help to ensure that the cables provided by manufacturers are compatible with similar products, and on the other hand, they urge manufacturers to show advantages in terms of performance, installation method or cost. In many people's opinion, the industry standard is compulsory, but strictly following the industry standard in the design and manufacture of coaxial cables should be a spontaneous, rational and win-win move in essence. Better promote interoperability, scalability and more efficient cost savings of communication systems.

 

What is high reliability?

 

   When it comes to "high reliability", the common understanding is the judgment conclusions obtained through reliability measurements, and the conclusion of this conclusion also needs to take actual equipment and applications into consideration. However, for high-reliability coaxial cables, the reliability of the cables can also be determined by comparing the cable parameters with relevant standards. Reliability is used to measure consistency and reusability. Therefore, when using high-reliability coaxial cable, users not only require the cable assembly to operate normally in a preset way, but also need to achieve stable operation from beginning to end . In the RF industry, "reliability" can be described as the typical performance of the cable, maintaining the proper level of performance during the product's life cycle, without performance degradation or performance loss. In actual use, one or more performance indicators involved in determining the reliability of a cable assembly will fluctuate with changes in the application scenario-a single parameter performs well in one application, but may be in another application Poor performance. Even so, reliability remains a vital part of ensuring proper operations in communications networks, emergency services, and even defense. In test and measurement applications, high-reliability cable assemblies are mostly used in the process of verifying the performance of the device under test. In this verification process, accuracy and reliability are just one of the verification indicators.

 

What are the components of high reliability?

 

Operating environment

 

   Whether the reliability of the RF cable assembly can be best reflected largely depends on its actual operating environment. Cable assemblies without proper EMI shielding can cause additional interference and should not be used for security surveillance and radar applications. The use of high-quality materials such as low-loss dielectrics and precious metal plating does not guarantee the reliability of the product. In the product development stage, it is critical to take the actual application into consideration and carry out targeted design. At the same time, the design must be tested.

 

   High-reliability cable assemblies are designed for applications where extreme temperatures, harsh environments, and excessive stress conditions exist, with performance as a necessary indicator. Because of this, the manufacturing process of high-reliability components involves meticulous and strictly controlled operating procedures, and specific testing and inspection of product qualification is required to ensure the best performance of the product and the high performance under extreme environments. Survival rate.

 

   In order to test the ability to withstand harsh environments, high-reliability cable assemblies must undergo thermal and mechanical shock tests, water and moisture exposure tests, and high temperature tests.

 

test

 

   Testing and measurement are vital to the evaluation and determination of product reliability. To make a competitive product, manufacturers of high-reliability cable assemblies must tolerate new concepts in product design and test the completed design in order to bring innovative products to market.

 

   Test parameters include insertion loss, return loss, phase stability, and hot and cold alternation. In the product development process, iterative measurement and test result analysis are also important. Among them, computer simulation software can provide a new foundation for the development of new products and high-performance test systems, which can further optimize the development process through reliable (accurate and repeatable) test data feedback. Finally, it is important to note that depending on the test method, certain cable assemblies or parts of such assemblies can be named "high reliability" without a comparison test with quality standards.

 

ROHO solution

 

The ROHO high-reliability cable series is divided into 124 basic configurations consisting of 6 different cable models, with a total of more than 700 product numbers, all of which can be shipped the same day.

 

   ROHO high-reliability cables can provide operating frequencies up to 12.4 GHz and voltage standing wave ratio (VSWR) as low as 1.3: 1, depending on the type of connector used. In addition, each cable assembly uses MIL-DTL-17-compliant cables, MIL-PRF-39012-compliant connectors, AS23053-compliant heat-shrinkable sleeves, and J-STD-standard soldering technology.

 

   In the past, engineers had to endure weeks or months of waiting periods to build cables with the above specifications and allow material traceability. Today, customers can choose from hundreds of different Pasternack cable products in stock, and one of the selected products is shipped and shipped the same day, 100% tested, with a test report and a batch of materials in the package Information for retrospectives.