Hi Doug: Microsiemens-cm is simply the inverse of megohm-cm, i.e. 2 megohm =
0.5 microsiemens = 1,000,000/2,000,000 ohms.
Also a reminder to all, when water is heated the specific resistance drops
dramatically. When 18 megohm-cm water at 23C is heated to 70C it drops to 3
megohm-cm.



Regards

Michael Barmuta

Staff Engineer

Fluke Corp.

Everett Wa

425-356-6076

-----Original Message-----
From: Douglas Pauls [mailto:[log in to unmask]]
Sent: Monday, April 10, 2000 5:36 AM
To: [log in to unmask]
Subject: Re: [TN] Cleanliness of boards


In a message dated 04/10/2000 7:06:42 AM US Eastern Standard Time,
[log in to unmask] writes:

>
>  What level of conductivity in water do you accept if you use water to
rinse
> boards in an inline cleaner? In IPC-AC-62A p 12 the recommended level is 1
> microsiemens/Cm if one is to conformally coat the boards afterwards.

We recommend the use of deionized water in all aqueous cleaning operations.
For us, deionized water is 2.0 megohm-centimeters of resistivity or higher.
Being metrically challenged, I am not sure what that is in microsiemens per
centimeter.

Doug Pauls
CSL

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