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Reply To: | TechNet E-Mail Forum. |
Date: | Mon, 28 Aug 2000 11:23:38 -0400 |
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I've taken electrostatic field readings after blowing dry nitrogen on
various board substrates, at various pressures and under different
conditions of relative humidity, and never found any appreciable charging.
Because de-ionizing nozzles are available, our customers seem to raise this
issue with some frequency. What I've found useful is to document my
findings in a project memo that I can pull out and display when challenged.
By the way, I don't think that grounding the nozzle has any appreciable
effect. If the wire running down the hose is a nuisance, try disconnecting
it when you take the readings with your electrostatic field meter.
> ----------
> From: [log in to unmask][SMTP:[log in to unmask]]
> Reply To: TechNet E-Mail Forum.;[log in to unmask]
> Sent: Monday, August 28, 2000 10:41 AM
> To: [log in to unmask]
> Subject: [TN] Another ESD question
>
> How do you folks feel about using compressed nitrogen to dry printed
> circuit
> boards? One of our customers will not allow aqueous cleaning of their
> hardware.
> As a result we clean all of their hardware in alcohol and dry by blowing
> it off
> with compressed nitrogen with the regulator at about 100 PSI. The nozzle
> is
> grounded at the tip. Please note that this is not related to my earlier
> quetion
> as this is done in a different area and only used on our space flight
> hardware.
> Thanks again,
> Charles Caswell
>
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