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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