Rick:
Use of ion generator air flow over the components is very helpful.
AC ion generators are simple and do not need to be calibrated, DC ones need
to be.
Regards,
Ramon
> -----Original Message-----
> From: Rick Thompson [SMTP:[log in to unmask]]
> Sent: Friday, February 06, 2004 10:31 AM
> To: [log in to unmask]
> Subject: Re: [TN] Facility Humidity control
>
> While on the subject of ESD and humidity control, I'm curious as to what
additional precautions are currently being used when required to operate
below 30% RH? Beyond the standard wrist and foot straps, conductive
flooring, etc. what additional precautions need to be mandated to operate in
lower humidity?
>
> Thanks for any feedback.
>
>
> Rick Thompson
>
> Sr. SMT Process Engineer
> SMTEK International, Inc.
> +1 (805) 532-2800
> [log in to unmask]
>
>
>
>
> -----Original Message-----
> From: Morse, Carrie [mailto:[log in to unmask]]
> Sent: Thursday, February 05, 2004 5:26 AM
> To: [log in to unmask]
> Subject: Re: [TN] Facility Humidity control
>
>
> J-STD-001C Paragraph 3.6.2 outlines the specifications. In summary, if
the humidity falls below 30%, then proper ESD control needs to be in place.
It also specifies a max of 70%. We are in the east and find our humidity
ranges from as low as 10% in the winter up to 50% or so in the summer. Even
with humidity controls in place we have difficulty maintaining the 30% min
in the winter.
>
> Although the spec states a range, other considerations need to be kept in
mind. These include the affect of humidity of MSD's, paste processes,
assembly processes, and even reflow. If paste dries out or absorbs
moisture, variation in these processes will be evident.
>
> -Carrie
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Peter L.
> Sent: Wednesday, February 04, 2004 5:46 PM
> To: [log in to unmask]
> Subject: [TN] Facility Humidity control
>
>
> Technet,
>
> What is the typical humidity/ temperture (nominal and +/-) for a CEM
> production environment?
>
> Is there an industry "acceptable" range?
>
> We are located here in the west coast and have seen relative humidity
level
> varied from low 30s% (winter) to high 60s in the summer. Under what
> conditions should a HVAC control system be introduced and without that,
> what would be the potential impact on the overall manufacturing process?
>
>
> Rgds,
> Peter
>
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