measuring FOP with simpson

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electricalperson

Senior Member
Location
massachusetts
i guess im just crazy or something. if i measure 120v i will blow the meter but if i measure across a breaker each side is the same potential pretty much and will measure millivolts
 

LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
Start with the above-the-line-voltage setting on the meter, and lower the range one click at a time as far as you dare.

As for actual damage, you'd have to see if maximum voltage inputs are specified in the meter's documentation.
 

Speedskater

Senior Member
Location
Cleveland, Ohio
Occupation
retired broadcast, audio and industrial R&D engineering
Now, if the breaker decides to trip just as you are making a measurement, the meter will see the full line voltage.
 
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