We did this: had arrays of 0.1 tp 1.0 pF ceramic caps on the substrate. Not many micro Coloumbs needed to charge. Used a Keithly instrument for measurement (don't remember what type, many years since test).

Inge

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Landman
Sent: onsdag 24 mars 2010 13:02
To: [log in to unmask]
Subject: Re: [TN] air or nitrogen for drying

Inge,

EDD check meters are crude field meters.  What Trek also makes are  
electrostatic voltmeters that can read very small static voltages.   
They have probes on cables connected to the meters.

Bob

Sent from my iPhone

On Mar 23, 2010, at 6:23 PM, Inge <[log in to unmask]> wrote:

> We have been using nylon nozzles for many years on hitech multichip 
> modules. Used our ESD check boxes and blew both dry nitrogen and air 
> on the samples for many minutes, not a single volt on the display. I 
> was afraid of surface charges in insulators, but could not register 
> any.  Think molecules with long distances between do not give same 
> effect as homogenous material which can offer electrons.  The only 
> danger I think is mutual electrostatic induction from too close a 
> charged nozzle tip, keep distance.
>
> Inge
>
> --------------------------------------------------
> From: "Thayer, Wayne - IIW" <[log in to unmask]>
> Sent: den 23 March 2010 14:50
> To: <[log in to unmask]>
> Subject: [TN] air or nitrogen for drying
>
>> We have a number of "airbrush" low pressure nozzles around here for  
>> spraying solvents on reworked boards and for drying them off.  I  
>> know that nozzles can create static, but I have had no problems to  
>> date and have had no problem with dust sticking to the boards when  
>> I dry them off this way.
>>
>> I haven't been able to find anything on trying to quantify static  
>> from nozzles used in this way.  Does anyone have data?  Moving to  
>> ionized blow-off for drying the boards would be painful, as that  
>> means yet more equipment in our small cleaning stations.
>>
>> Wayne Thayer
>>
>> ________________________________
>> This e-mail and any files transmitted with it may be proprietary  
>> and are intended solely for the use of the individual or entity to  
>> whom they are addressed. If you have received this e-mail in error  
>> please notify the sender.
>> Please note that any views or opinions presented in this e-mail are  
>> solely those of the author and do not necessarily represent those  
>> of ITT Corporation. The recipient should check this e-mail and any  
>> attachments for the presence of viruses. ITT accepts no liability  
>> for any damage caused by any virus transmitted by this e-mail.
>>
>> ______________________________________________________________________
 

>> This email has been scanned by the MessageLabs Email Security System.
>> For more information please contact helpdesk at x2960 or [log in to unmask]
>> ______________________________________________________________________
 

>>
>> ---------------------------------------------------
>> Technet Mail List provided as a service by IPC using LISTSERV 15.0
>> To unsubscribe, send a message to [log in to unmask] with following  
>> text in
>> the BODY (NOT the subject field): SIGNOFF Technet
>> To temporarily halt or (re-start) delivery of Technet send e-mail  
>> to [log in to unmask]: SET Technet NOMAIL or (MAIL)
>> To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask] 
>> : SET Technet Digest
>> Search the archives of previous posts at: http://listserv.ipc.org/archives
>> Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 
>>  for additional information, or contact Keach Sasamori at [log in to unmask] 
>>  or 847-615-7100 ext.2815
>> -----------------------------------------------------
>
>
> ______________________________________________________________________
> This email has been scanned by the MessageLabs Email Security System.
> For more information please contact helpdesk at x2960 or [log in to unmask] 
>   
> ______________________________________________________________________
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 15.0
> To unsubscribe, send a message to [log in to unmask] with following  
> text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask] 
> : SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask] 
> : SET Technet Digest
> Search the archives of previous posts at: http://listserv.ipc.org/archives
> Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 
>  for additional information, or contact Keach Sasamori at [log in to unmask] 
>  or 847-615-7100 ext.2815
> -----------------------------------------------------
>

______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------

______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------