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Ionic Contaminate Testing (time or auto terminate)


K

#30361

Ionic Contaminate Testing (time or auto terminate) | 2 September, 2004

Hi: I am wondering what others are doing that use a Static Ionic contaminate test (e.g. Ionograph/Alphametals) in relation to time. Our Ionograph has the option of setting a test time, or setting it to auto-terminate when there is no change in resistivity within X time. I do not see anything in the J-STD-001 that specifies a time to use, but the IPC-TM-650 section 6.1, could be interpreted to say the the test option of auto-termination should be used.

What are others doing & what are your thoughts.

-K

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#30369

Ionic Contaminate Testing (time or auto terminate) | 2 September, 2004

Hi -K

We are a manufacturer of ionic contamination testers (not yours). In most cases, automatic mode is appropriate. In some instances however, you may need extra time to �release� entrapped contamination from the sample.

Automatic mode is not appropriate if the contamination does not begin to register on the device for several seconds. The testing device may prematurely determine that no contamination exists on the sample and terminate the test. In this case, a fixed time test is justified.

If operating in a fixed time mode, it is imperative that the device be given enough time to extract and detect all of the contamination on the sample. Most cleanliness testers allow the device�s printer to produce a real-time graph. If a fixed time is programmed, check the printed graph to ensure that the level of contamination �flat-lined� before the termination of the test. If, after the termination of the fixed time test, the graph indicates that the contamination was still rising, then the test result is not complete.

I hope this helps.

Regards,

Mike Konrad Aqueous Technologies www.aqueoustech.com konrad@aqueoustech.com

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