Why do you need to null the test leads on an instrument?

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urim";p="1211826 said:
Hi there.

could anybody help me.

I am doing an electrician course, and at the moment i am stuck on one question,

maybe anybody could explain the answer for me.
the question is :

Why do you need to null the test leads on an instrument?


sorry for seeming a bit despondant but my advice is wait to the end of the course and if this question has not been answered take up a course in scone making or animal husbandry
 
The O/P was made last May, hopefully the OP has figured it out by now! ;)
 
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