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Reply To: | TechNet E-Mail Forum. |
Date: | Fri, 27 Sep 2002 10:17:31 +0100 |
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Daan,
The document you are looking for is:
Materials Research Report 3-78, 29 August 1978, Naval Avionics Center,
Indianapolis, revised 17 Feb 1981.
Title: Review of data generated with instruments used to detect and measure
ionic contaminants on printed-wiring assemblies.
The figure of 3.1 you quote for the Ionograph is correct.
John Boocock
Radstone Technology
[log in to unmask]
-----Original Message-----
From: d. terstegge [mailto:[log in to unmask]]
Sent: 27 September 2002 07:37
To: [log in to unmask]
Subject: [TN] Ionograph measurements
Hi Technet,
One of our customers is complaining that the upper limit for our
ionograph test is set at 3.1 micrograms/cm2 instead of the 1.56
micrograms/cm2 that the IPC/EIA J-STD-001C prescribes is section 8.3.6.
I know there exists a document (probably an IPC or MIL-spec)
explaining how the 1.56 limit should be corrected for the exact type of
machine. For the Alpha Ionograph 500M the conversion factor is 2,
resulting in the 3.1 micrograms/cm2 limit.
However I can't remember where exactly this information can be found,
and I don't even know if it's still valid. Does anyone has a clue for me
?
Daan Terstegge
Unclassified mail
Personal Website: http://www.smtinfo.net
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