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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