ANSI TIA 455 104 B pdf free download

ANSI TIA 455 104 B pdf free download.FOTP-104 Fiber Optic Cable Cyclic Flexing Test.
3.4 Flexing Sheaves. (Note: The term, “sheaves” as used throughout this procedure shall be understood to mean any appropriate flexing plates, mandrels, etc. used to control the configuration of the cable bend, and is not intended to require the use of true sheaves or grooved wheels.) Attach pairs of sheaves at a definite distance from the flex arm clamp, positioned such that they will not prevent free movement of the cable. It is recommended that there be 1 to 3 mm of clearance on each side between the cable and the sheaves in order to prevent undue friction on the cable at the flexing point. Use sheaves as shown in Figure 1 and as listed in Table I. Unless otherwise specified in the Detail Specification, the following default maximum values apply, in cases where the exact sheave diameter is not available a suitable sheave may be used such that its diameter is smaller than the stated maximum: 3.4.1 For all except U.S. Military applications, use sheaves per Table I, Sheave Designation Letter B. 3.4.2 For U.S. Military applications only, use sheaves per Table I, Sheaf Designation Letter E.3.5 Force on the Cable or Load Weights (Mass). Apply sufficient force to the cable to keep it in contact with the sheaves while flexing. Manual force or weights may be used. If flexing under specific tensile load is required, it shall be specified in the Detail Specification. When used, weights (mass) shall be attached to or suspended from the cable under test. The minimum load to be applied is usually dependent upon the outside diameter (and, to some extent, the stiffness) of the cable under test. Increase the load if necessary to ensure full quadrant contact of the cable with the sheaves during testing. Unless otherwise specified in the Detail Specification.3.6 Environmental Chamber and Associated environmental chamber and/or associated equipment required for nonmilitary applications. For applications only, unless otherwise specified Specification. Use a suitable environmental chamber that has an operational range sufficient to provide the temperature extremes) specified in the Detail Specification. The chamber shall maintain the required temperature within士1 °C (土1.8 °F) throughout the duration of the test. The chamber inside dimensions shall be sufficient to accommodate the ‘physical test apparatus and the specimen under test, and to permit unrestricted air flow around the apparatus and specimen. The chamber shall be equipped with an access port (or stuffing box) through which the fiber or cable ends and instrument wires or other leads will exit the chamber. The access port shall adequately seal the chamber around the extended cables, fibers, etc. that are exiting the chamber. 3.7 Temperature Recording Devices. If temperature recording is required (mandatory for U.S. Military applications, unless otherwise specified in the Detail Specification), the following criterion applies: Use temperature recording devices to provide a record of the temperature throughout the test. It may be desirable to have a multi-channel recorder so that thermocouples can be placed around the specimen to record its temperature. The recorder shall have an accuracy of士1 °C (土1.8 °F) at the temperature(s) specified in the Detail Specification. 3.8 Other Equipment. All other necessary test and inspection equipment shall be available as required by FOTPs -13 and -20. Refer to the required FOTP for details.ANSI TIA 455 104 B pdf download.