Screening and Screening Rational

S

shiptowns

#1
Hello All:

I have an interesting situation I am facing at my company right now. We order a camera for our microscope we build in house and we have determined that certain cameras trip our internal watchdog circuit at 60mA. Of course when we measure the standby current for a microscope camera after resetting the system, it measures either below or above the 60mA threshold, mostly below. We know when a camera hits the 60mA threshold it will trip the hardware alarm, however we can't be sure when it will do it. The microscopes that did trip the hardware alarm, when remeasured, measured around 45mA plus or minus 10mA. We decided to perform a screening of cameras once they get inhouse and say 35mA was the cut off, thinking anything above that could trip the hardware alarm due to fluctuations in current. How can I rationalize that 35mA cut off and is there a quantitative way to develop a number for screening? Unfortunately we buy the cameras off-the-shelf so we get what we get and i don't know how much we will get in terms of root cause for the variance.
 
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