Kelley,

To accurately determine an appropriate test time, one would have to plot
the amount of contamination removal over the course of time. The
appropriate test time would then be approximately 90 percent of where
the curve begins to flatten out. The automatic modes count the
extraction rate and approximate the flattening of the curve.

Regards,

Gary Ferrari
FTG Circuits
Director, Technical Support
860-350-9300

Kelly Morris wrote:
> Just wanted to do a poll to see how others are determining their test time for
> Ionic testing.
>
> Test Method IPC-TM-650 number 2.3.25, section 5.3.3, says "The test time
> should be in accordance with the monitoring plan criteria (set time or auto-
> shutoff).
>
> We are using an Ionograph 500M, to monitor the effectivity of our cleaning
> after soldering processes.  The software gives the option of doing a set time
> or auto-shutoff.
>
> I'd like to hear how others have determined what test time method to use, and
> if a set time, how long that time is, and why.
>
> Thanks in advance for your input.
>
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