bs英國(guó)標(biāo)準(zhǔn)bsen50288-6-2-20xx用于模擬和數(shù)字通信和控制的多元件金屬電纜第6-2部分250mhz及以下的非屏蔽電纜的分規(guī)范工作區(qū)域和中繼電纜-免費(fèi)閱讀
【正文】 25 dB, 10 MHz f ? 20 MHz 。 — monitor related internation al and Europe an develo pm ents and promulga te them in the UK. A list of anizations repre sented on this submitt e e can be obtain ed on request to its secretary. Crossr efer e nces The British Standard s which implement internation al or Europea n public a tions referred to in this document may be found in the BSI Catalogue under the section entitle d ―International Stand ards Correspondence Index‖, or by using the ―Search‖ facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsib le for its correct applica tio n. Compliance with a British Standard does not of itself confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Commi tte e on 2 February 2020 169。 Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: copyrightbsiglob . 國(guó)內(nèi)外標(biāo)準(zhǔn) 大全 網(wǎng) 國(guó) 內(nèi) 外 標(biāo) 準(zhǔn) 下 載 地 址 。BRITISH STANDARD BS EN 5028862:2020 Multielement metallic cables used in analogue and digital munication and control — Part 62: Sectional specification for unscreened cables characterised up to 250 MHz — Work area and patch cord cables The Europe an Standard EN 5028862:2020 has the status of a British Standard ICS Amd. No. Date Comments BS EN 5028862:2020 National foreword This British Stand ard is the official English language version of EN 5028862:2020. The UK particip ation in its preparation was entrusted by Technical Committee EPL/46, Cables, wires, waveguid es, . connectors, . and microwa ve passive ponents and accessories, to Submitt ee EPL/46/1, Comm un ication cables, which has the responsibility to: — aid enquirers to understand the text。 . Nearen d unbal anc e attenu ati on ? 4010l o g(f) dB, 1 MHz ? f ? 250 MHz Coupli n g attenuati on ? 40 dB, 30 MHz ? f ? 100 MHz ? 4020l o g(f/100) dB, 100 MHz f ? 1 000 MHz 1) For hybrid and multiunit cables and cables, PSNEXT between all non fibre recognised cable units shall be 3 dB better than the specified pair to pair NEXT at all specified frequencies. 2) The values in the table are for information only. The formula given shall be used to determine pliance, rounded to one decimal place. 3) The attenuation shall meet values adjusted for temperature up to 40 ?C temperature coefficient of 0,4 % per degree rise and for temperatures from 40 ?C to 60 ?C with a temperature coefficient of 0,6 %, above 20 ?C. 4) Values between 1 MHz and 4 MHz are for information only. 5) For the measurement of return loss a test sample having a round trip loss ? 40 dB at any measured frequency should be used. EN 5028 8 6 2 :2 00 3 ? 8 ? Mechanical tests EN 502881 Subclause no Parameter Requirem ent Conductor elongation at break EN 5028932 ? 10 % Shrinkage of insulation EN 5028934 ? 5 % Crush resistance of the cable EN 5028935 1 000 N / 1 min / 100 mm Nearen d crosstal k , return loss and charac teris tic impedanc e shall remain within the specifi ed limits Impact resistance of the cable EN 5028936 12,5 mm radius / 1 J / 3 impacts at 1 m from the meas ure d end Nearen d crosstal k , return loss and charac teris tic impedanc e shall remain within the specifi ed limits Abrasi on resistanc e of the sheath marki ngs EN 5028938 Marki ng shall remain legible Simul ate d install ati on testing of the cable Simul ate d install ati on testing of the cable Single bend EN 5028939, Claus e 4, procedure 2 Single bend 4 ? dia / 4 cycles Nearend crosstalk, return loss, characteristic impedance and coupling attenuation (u/c) shall remain within the spec
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