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在 2011-7-18，22:35，"Leesha \"Lixia\" PENG" <[log in to unmask]> 写到：

> http://www.esdjournal.com/techpapr/sfowler/wireless.htm
> We Challenge Wireless Wrist Strap Manufacturers!!!!!!
> October 27, 2005
> Send in yours for evaluation if you dare!
> Go ahead, Make our Day!
> If we are Wrong, we will put up an apology and a free advertisement for one year.
> New reports of another wireless wrist strap being sold brings up a question from our readers: "Do they work?" The article listed below was published a few years ago when our labs evaluated one style of wireless wrist strap. We found no evidence that they do or ever could significantly reduce the charges on a person. This new one reports it works on the "Selglard" principle. To quote: "It operates "Selglard' electric halo principles, making body's static electricity to discharge through discharge box." Does anyone know what that is? A few prepositions in the statement might help us understand.
> Most wireless wrist straps try to use passive ionization even if they do not recognize what they are stating. The problem with passive ionization is that it is distance and potential related. We have never seen a passive ionizer reduce a charged body below 1000 Volts in the best of conditions. The new strap even states that it is not for use in dry climates. We do not believe it is for use in any climates.
> 
> At the ESD Journal, we have developed a new more effective personnel neutralization system. It operates on the Fowler Halo Principle. Price for this device starts at $15 depending on head size. Note the stylishness of the device. It comes with an optional "pony tail" addition for higher efficiency at an additonal price.
> We will soon have our version of the wireless wrist strap,which will sell for $5 and also comes with the high efficiency "pony tail" addition.
> 
> 
> The following is an artice we published a few years ago. We stand by it now.
> Evaluation of Wireless Wrist Straps
> by: ESD Journal Lab
> We have been asked many times over the past few years about the viability of wireless wrist straps. The following is our evaluation of one wireless wrist strap.
> We used a wireless wrist strap that is advertised as:
> "It operates using a combination of several physics phenomena like "Ion Neutralization, Skin Effect, Point Discharge and Corona Discharge Effect" combined with the principle of differential potential to collect and dissipate static electricity.
> It is a combination of bio-industrial and electronic technologies.
> In effect, the wireless wrist strap neutralizes over 80% of the static electricity on a human body and maintains the potential of a human body below 150V which is low enough to protect electronic components."
> 
> The following is a summary of our evaluation of the strap:
> The wrist strap came with a conventional cord for use at the workbench. However, it is claimed to neutralize the static on a person without the cord attached "after 15 seconds."
> 
> *   Our tests showed that the wrist strap when connected by it cord had a resistance from the wearer's hand to ground of 1.3 MegOhms.
> 
> 
> *   Our technician wore insulative shoes (> 10,000 MegOhms) and walked on an insulative floor.
> *   We charged the technician to 2,000 volts.
> *   When and he walked around with the uncorded wrist strap on, we saw a decay of the static charge to about 1,000 Volts in 90 seconds.
> *   When and he walked around without the wrist strap, we saw a decay of the static charge to about 1,000 Volts in 90 seconds.
> *   There was no difference in the time to decay to 1,000 with or without the wrist strap in place.
> *   With the wrist strap on the walking technician, his potential never went below 700 volts for over 3 minutes.
> We dissected the wrist strap to see what inside would account for the claimed neutralization. We found only a 1 MegOhm resistor. This supports our findings that the wireless wrist strap no method for neutralizing a person not connected to ground by a conventional cord.
> 
> 
> 
> It is our opinion that no currently available methods or devices exist which will effectively ground a person without a tethered cord to ground or at least a large capacitance.
> 
> Sorry! Something that sounds too good to be true probably is.
> 
> Thanks and Best Regards
> 
> Leesha PENG 彭丽霞
> GM IPC China
> IPC中国总经理
> 18616593891
> 
> 
> 发件人: TGAsia [mailto:[log in to unmask]] 代表 Jim Wang
> 发送时间: 2011年7月18日 12:02
> 收件人: TGAsia
> 主题: [TGAsia] FW: [TGAsia] 答复: [TGAsia] Esd 静电手环
> 
> 
> All
> 
> 
> 
> 无线静电手环中仍然有一个1MΩ的电阻，其原理是主要依靠外壳上的全属导体向空气中放电，因此，当环境空气的湿度越大时，其静电释放的效果才会越好，否则，一点作用都没有。目前绝大多数的PCBA工厂，都不采用。
> 
> 
> 
> Best Regards,
> 
> 
> 
> Jim.Wang | QA Officer | Season Components Co., Ltd.
> 
> 
> 
> Email address: [log in to unmask]<mailto:[log in to unmask]>
> 
> Website address: http://www.seasongroup.com
> 
> Tel:  (86) 769-8338-8030  Ext. 8018 or 13652594880
> 
> Fax: (86) 769-8338-7427
> 
> -----Original Message-----
> From: TGAsia [mailto:[log in to unmask]] On Behalf Of Charles Lee(DD&TT)
> Sent: Monday, July 18, 2011 10:01 AM
> To: [log in to unmask]
> Subject: Re: [TGAsia] 答复: [TGAsia] Esd 静电手环
> 
> 
> 
> Dear All,
> 
> 
> 
> Why we don't recommend to use ESD wireless wrist strap is that the working
> 
> mechanism of its electrostatic discharge is not so convinced.
> 
> 
> 
> 
> 
> Best Regards
> 
> Charles Lee
> 
> 
> 
> -----Original Message-----
> 
> From: TGAsia [mailto:[log in to unmask]] On Behalf Of Mark Yang
> 
> Sent: Monday, July 18, 2011 9:50 AM
> 
> To: [log in to unmask]
> 
> Subject: Re: [TGAsia] 答复: [TGAsia] Esd 静电手环
> 
> 
> 
> 期待了解这个信息，我们公司也有同样的问题，有很多客户都怀疑无绳的静电手环，我
> 
> 们需要足够的证据向客户说明，谢谢！
> 
> 
> 
> Best regards!
> 
> Mark
> 
> 
> 
> ----- Original Message -----
> 
> From: "Leesha "Lixia" PENG" <[log in to unmask]>
> 
> To: <[log in to unmask]>
> 
> Sent: Saturday, July 16, 2011 10:06 AM
> 
> Subject: Re: [TGAsia] 答复: [TGAsia] Esd 静电手环
> 
> 
> 
> 
> 
>> 静电是不可移动的电荷，停留在某个物体上。遇到导体时，会快速移动。如果静电敏
> 
> 感物体在这个静电荷快速移动的通路上，就会被损坏。
> 
>> 接地的防静电的用具为静电荷提供一个电的通路，串联了一个兆欧级电阻，降低静电
> 
> 荷移动的速度，大大降低了静电敏感物体被损伤的机会。立鹤说的快速应该理解为随时
> 
> 的意思。我不懂无线手环的原理，但是根据立鹤的说明，我的理解是无线手环不能随时
> 
> 排走静电荷，静电荷必须积累到一定程度时才能通过尖端放电排走。
> 
>> 我会查找IPC的技术文献，然后向大家报告。
> 
>> 
> 
>> Leesha Peng
> 
>> 彭丽霞
> 
>> IPC中国总经理
> 
>> 18616593891
> 
>> 
> 
>> 
> 
>> 在 2011-7-16，上午8:26，"郑立鹤"
> 
> <[log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]:[log in to unmask]>>> 写道：
> 
>> 
> 
>> 无线静电手环应是采用尖端放电的原理来释放电荷， 只有当电荷积累
> 
>> 到一定的程度时（有书上说是人体静电压2000V以上时）才会发生静
> 
>> 电荷的释放，有线的手环静电释放速度就很快且较为彻底，用CPM来做
> 
>> 一个对比测试，效果很明显，但是具体是否适用，还是要根据每个公司
> 
>> 的具体情况（如器件的静电敏感等级）来判定。
> 
>> 以上仅个人见解，不正确的地方还请指正！
> 
>> 
> 
>> 
> 
>> 电子工程：郑立鹤
> 
>> 伊戈尔电气股份有限公司
> 
>> 佛山市南海区简平路桂城科技园A3号
> 
>> MP：18666577208      zip code:528200
> 
>> Tel：0757-86256771
> 
>> E-mail：[log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]:[log in to unmask]>>
> 
>> Website：www.eaglerise.com<http://www.eaglerise.com<http://www.eaglerise.com%3chttp:/www.eaglerise.com>>
> 
>> ________________________________
> 
>> 发件人: TGAsia [mailto:[log in to unmask]] 代表 Dh
> 
>> 发送时间: 2011年7月15日 10:07
> 
>> 收件人: <mailto:[log in to unmask]> [log in to unmask]<mailto:[log in to unmask]>
> 
>> 主题: [TGAsia] Esd 静电手环
> 
>> 
> 
>> 大家好，请教各位，那种无线式静电环可以用吗？有些客户不赞成用，我们公司是组
> 
> 装厂，机器都比较大，用有线环不太方便。
> 
>> 谢谢！
> 
>> 
> 
>> Edmund Liu
> 
>> 
> 
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