原帖由 <i>dacong</i> 于 2008-12-10 18:53 发表<br />
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这个等级只够防防洒水,大雨是抗不住的
dacong兄，您的观点我恐怕不能苟同。
第一，IPX7 标准的设备不应该是“防洒水”而应该是“防浸水”，并且，应该是能抵抗在1米水深下30分钟的浸泡，“防洒水”应该是3-4而不是7；这一点您可以从 http://gpsinformation.net/iec529.htm 查到。俺英文不咋地，就粘在下边吧。
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The table below gives a summary of the requirements for IEC 529 for WATER PROTECTION PROVISIONS.
Test
Level Definition
0 Non protected, No special protection
1 Protected against falling water Equivalent to 3-5mm rainfall per minute for a duration of 10 minutes.
Unit is placed in its normal operating position.
2 Protected against falling water when tilted up to 15 degrees. Same as (1) above but unit is tested
in 4 fixed positions - tilted 15 degree in each direction from normal operating position.
3 Protected against spraying water, Water spraying up to 60 degrees from vertical at 10 liters/min at
a gage pressure of 80-100kN/m2 for 5 min.
4 Protected against splashing water. Same as level 3 but water is sprayed at all angles.
5 Protected against water jets Water projected at all angles through a 6.3mm nozzle at a flow rate of
12.5 liters/min at a gage pressure of 30kN/m2 for 3 minutes from a distance of 3 meters.
6 Protected against heavy seas. Water projected at all angles through a 12.5mm nozzle at a flow rate
of 100 liters/min at a gage pressure of 100kN/m2 for 3 minutes from a distance of 3 meters.
7 Protected against water immersion. Immersion for 30 minutes at a depth of 1 meter.
8 Protected against water submersion The equipment is suitable for continuos submersion in water
under conditions which are identified by the manufacturer.
*Note: IEC 529 level 7 is designated "IPX7" and is equivalent to JIS 7. The position of "X" being left blank indicates that the unit has no special mechanical protection.
*Note: Garmin typically uses the IEC-529 spec for the design spec for water protection level for their line of GPS equipment. Marine rated GPS equipment is usually tested to IPX7.
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第二，我不知道您是否亲自实践过证明 IPX7 的设备防不了“大雨”，反正我用过Garmin的至少10种IPX7防水GPS, 就和下面的照片那样挂在背带上，一年四季雨雪无阻，从未担心其防水问题，也确实就没有出现过问题。我的经验是IPX7防水的设备通常的户外活动不需要特意防水保护，除非您在水下活动。
这里有一篇Garmin MAP60CSx 1米水深的防水测试： http://www.mobile01.com/topicdetail.php?f=228&t=193933
当然，或许您说的“大雨”足够大，俺没有经历过，比把设备放在水下1米待半个小时还厉害也有可能；也或许您用的 IPX7 的设备太山寨了，根本只有IPX3 也未必不可能。
[ 本帖最后由 ski 于 2008-12-15 08:20 编辑 ] |
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发表于 2008-12-9 13:35
发表于 2008-12-9 16:08