This file is raw output from pdftotext and may not be ideal for distribution. If you are a maintainer for Hackipedia, please sit down when you have time and clean this text version up. Source PDF: /mnt/main/jmc-storage/docs/SCTE/ANSI SCTE 031 Test Method for Measuring Diameter Over Core (2007).pdf Like all conversions the text below should be fully readable as UTF-8 unicode text. --------------------------------------------------------------- ENGINEERING COMMITTEE Interface Practices Subcommittee AMERICAN NATIONAL STANDARD ANSI/SCTE 31 2007 Test Method for Measuring Diameter Over Core NOTICE The Society of Cable Telecommunications Engineers (SCTE) Standards are intended to serve the public interest by providing specifications, test methods and procedures that promote uniformity of product, interchangeability and ultimately the long term reliability of broadband communications facilities. These documents shall not in any way preclude any member or non- member of SCTE from manufacturing or selling products not conforming to such documents, nor shall the existence of such standards preclude their voluntary use by those other than SCTE members, whether used domestically or internationally. SCTE assumes no obligations or liability whatsoever to any party who may adopt the Standards. Such adopting party assumes all risks associated with adoption of these Standards, and accepts full responsibility for any damage and/or claims arising from the adoption of such Standards. Attention is called to the possibility that implementation of this standard may require the use of subject matter covered by patent rights. By publication of this standard, no position is taken with respect to the existence or validity of any patent rights in connection therewith. SCTE shall not be responsible for identifying patents for which a license may be required or for conducting inquiries into the legal validity or scope of those patents that are brought to its attention. Patent holders who believe that they hold patents which are essential to the implementation of this standard have been requested to provide information about those patents and any related licensing terms and conditions. Any such declarations made before or after publication of this document are available on the SCTE web site at http://www.scte.org. All Rights Reserved © Society of Cable Telecommunications Engineers, Inc. 2007 140 Philips Road Exton, PA 19341 i TABLE OF CONTENTS 1.0 SCOPE .........................................................................................................1 2.0 COMPLIANCE NOTATION ......................................................................1 3.0 DEFINITIONS .............................................................................................1 4.0 EQUIPMENT...............................................................................................2 5.0 TEST SAMPLES .........................................................................................3 6.0 MEASUREMENT OR TEST METHOD ………………………………..3 LIST OF FIGURES FIGURE 1 – TEST SET-UP 2 ii 1.0 SCOPE 1.1 To document sample preparation, sample testing and test procedure for measurement of core diameter and core ovality of coaxial cables. 2.0 COMPLIANCE NOTATION “SHALL” This word or the adjective “REQUIRED” means that the item is an absolute requirement of this specification. “SHALL NOT” This phrase means that the item is an absolute prohibition of this specification. “SHOULD” This word or the adjective “RECOMMENDED” means that there may exist valid reasons in particular circumstances to ignore this item, but the full implications should be understood and the case carefully weighted before choosing a different course. “SHOULD NOT” This phrase means that there may exist valid reasons in particular circumstances when the listed behavior is acceptable or even useful, but the full implications should be understood and the case carefully weighed before implementing any behavior described with this label. “MAY” This word or the adjective “OPTIONAL” means that this item is truly optional. One vendor may choose to include the item because a particular marketplace requires it or because it enhances the product, for example; another vendor may omit the same item. 1 3.0 DEFINITIONS 3.1 CORE DIAMETER: The outside diameter of the laminated tape, as-measured after the jacket and braid have been removed from the coaxial cable. 3.2 CORE OVALITY: The difference between the maximum core diameter and the minimum core diameter. This is the commonly used measurement in SCTE standards. However it may also be expressed in other ways such as a percentage variation. 4.0 EQUIPMENT 4.1 Optical micrometer. Optical micrometer make: LaserMike Model 182 or equivalent. 4.2 Printer (optional). 4.3 Wire cutters. 4.4 Rotating chuck, large O.D. chuck. Figure 1 – Test Set-up 2 5.0 TEST SAMPLES 5.1 Cut a 6” sample of finished product. 5.2 Strip jacket and braid off five inches (5”) of the sample, while retaining the tape, dielectric and conductor. Special care must be exercised during removal of jacket and braid to avoid deforming the tape. Apply adhesive tape over the sample loose end to keep the tape on the core. 6.0 MEASUREMENT OR TEST METHOD 6.1 Test Equipment Setup. See Figure 1. 6.1.1. At the beginning of the test, set the optical micrometer to reach eight (8) readings per 360 degrees rotation. Refer to the optical micrometer operation manual for details. 6.1.2. Verify that the printer is connected to the optical micrometer printer ports, if available. 6.1.3. Verify the optical micrometer is set to display and/or output the average, standard deviation, maximum, minimum, and the difference between the maximum & minimum readings. Refer to optical micrometer operation manual for details. 6.2 Test Procedure 6.2.1. Insert the test specimen or sample jacketed-end inside the rotating chuck as far as possible. 6.2.2. Tighten the chuck jaws on the sample until the sample is firmly held in- place. 6.2.3. Verify that the sample is centered between the chuck jaws and is not cocked. 6.2.4. Verify the test sample and the laser beam intersect. 6.2.5. Push the “start” button or its equivalent. 6.2.6. The rotating chuck shall rotate through at least one full 360 degree rotation cycle at any user-defined rpm, in order to obtain the required 8 readings per 360 degree rotation. Let the sample come to a complete stop. 6.2.7. Test result should appear on the optical micrometer display. Record the average, maximum, minimum and difference, if available, or obtain a printout of the test results. Refer to the optical micrometer operation manual. 3