What is non-intrusive way of testing & intrusive way of testing in DFT?

[sathishkas]

Hi,

There are two types of testing in DFT. 1) non-intrusive way of testing and other is 2)intrusive way of testing the system.

Can anyone explain what is the meaning of those testing in DFT?

Thanks in advance.

 

[reidintransit]

Intrusive means you have to modify the board or solder down leads to get the signal and it impacts the board's final usability. Non-intrusive means the board can be tested without damaging or changing the board. If the circuit is in use then intrusive means that it has to be taken out of service to be tested.