BS/EN 61300-2-37-2016 pdf download.Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 2-37: Tests — Cable bending for fibre optic closures.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for Its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 61300-1, Fibre optic interconnecting devices and passive components — Basic test and measurements procedures — Part 1: General and guidance
IEC 61300-2-38, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 2-38: Tests — Sealing for pressurized fibre optic closures
IEC 61300-3-1, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 3-1: Examinations and measurements — Visual examination
IEC 6 1300-3-28. Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 3-28: Examinations and measurements — Transient loss
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
closure
enclosure intended to provide protection to splices and joints against water and dust ingress
Note 1 to entry: Protection Is provided by an overpressure/under-pressure sealing of at least 20 kPa or complete inner filling or tree-breathing method,
3.2
climatic chamber
chamber needed for conditioning the device under test
3.3
holding fixture
fixture for mounting the DUT
3.4
bending device
device for applying a controlled bending moment to the cable
4 General description
4.1 Device under test (DUT)
The DUT is defined as an assembled closure with cable comprising all necessary parts for the required function. Separate DUTs for sealing performance and optical evaluation may be used.
The sealing performance DUT shall be provided with an air pressure test access valve. The length of the cables extending from the OUT shall be at least 1 m. The open ends of the cables shall be sealed. Each applicable cable type with minimum and maximum cable dimensions shall be represented in the test program. Multiple DUTs may be required to accommodate these cables.
The optical evaluation DUT shall be constructed in such a way that it represents all allowed functions of the product. This shall be realised by building optical circuits for each fibre separation level. Each applicable cable type with minimum and maximum cable dimensions shall be represented in the test program.
4.2 Test procedure
The DUT shall be securely fixed and placed in a conditioning chamber. The cable shall be subjected to a specified number of bending cycles. A bending cycle shall consist of a bend in one direction followed by an equal bend in the opposite direction and a return to the original position. A force adequate to produce the specified bending shall be applied smoothly and in a controlled manner to the cable at the specified distance from the closure outlet. Examinations and measurements for damage of the cable, the closure, and the cable-toclosure seal as well as hardware failure inside closure shall be made after the test.
5 Apparatus
An example of the test apparatus is given in Figure 1.
At room temperature, assemble a number of closure DUTs as defined in the relevant specification, using the smallest and largest diameter of the cable(s) for which the closure is designed, following the manufacturer’s instructions. More OUTs than the minimum cited in the specification may be required to accommodate all applicable cable types and sizes and fibre separation levels. Mount the DUT to the holding fixture. Attach the cable to the device for applying the bending moment, Unless otherwise specified, clamp the cable at 400 mm from the end of the cable seal. For cables with outside diameter larger than 25 mm the length shall be increased to 1 000 mm from the end of the cable seal. Connect the fibres of the device under test to the optical circuit (if required). The number of the ports of the DUT to be used and the configuration of the optical circuit shall be specified in the relevant specification.
6.2 Pre-conditlonlng
Place the device under test with the holding fixture in a climatic chamber and pre-condition it for 4 h at the standard test conditions specified in IEC 61300-1 unless otherwise specified in the relevant specification.
6.3 Initial measurements
Complete initial examinations and measurements on the DUT as required by the relevant specification.
6.4 Conditioning
The following procedure shall be accomplished:
— condition the sample at the test temperature for either 4 h or as otherwise specified in the relevant specification:
— pressurize the closure to the specified pressure, if required:
— measure the pressure according to the test method B of IEC 61 300-2-38.
Conditioning of the DUT at other lower and/or higher temperatures shall be specified in the relevant specification.
6.5 Bending procedure
Move the clamp to the specified angle. The applied bending force shall not exceed 500 N. If rio angle is specified, bending to an angle of 30° is recommended. When applying the bends, change from one extreme position to another within 15 s. Maintain the cable bend for a specified time in each direction. If duration is not specified, maintain the cable bend position for 5 mm in each direction. Apply the specified number of bending cycles. Repeat bending at the axis perpendicular to the initially tested axis. Repeat at other axes if specified.BS/EN 61300-2-37-2016 pdf download.
BS/EN 61300-2-37-2016 pdf download
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