1
請教高手解釋一下電線的衰減測試具體內(nèi)容，以及相應(yīng)的標(biāo)準(zhǔn)是什么？
2
衰減測試?什么衰減?
是不是電容衰減?電容衰減測試按UL62中5.2.4.
5.2.4.1 Permittivity –²W² Type cords
5.2.4.1.1 When tested in accordance with CSA C22.2 No. 0.3, Clause 4.28.4; UL 1581, Section 1020; or
NMX-J-040-ANCE, the permittivity of the insulation shall be as follows:
(a) after 14 d of immersion the capacitance shall not be more than 10% greater than the
capacitance measured after the first day; and
(b) after 14 d of immersion the capacitance shall not be more than 3% greater than the
capacitance measured after 7 d.
5.2.4.1.2 Tests shall be made using three 5 m (16 ft) specimens of insulated conductor. Specimens shall
be
(a) tested without any polyester tape or similarly non-absorptive separator; and
(b) selected before assembly into finished cord.
The middle 3 m (10 ft) of each specimen shall be immersed continuously in tap water in a temperature of
50 °C ± 1 °C for thermoset insulation or 60 °C ± 1°C for thermoplastic insulations for 14 d. The 1 m (3 ft)
end portions of each specimen shall be kept dry above the water as leakage insulation. A cover for the
tank shall be placed directly above the surface of the water. The water level shall be kept constant.
［echoo 在 2008-10-10 16:57:40 編輯過］