© PCE Instruments
4
5
Testing the earth pin
Testing the local earth employs the “ fault loop” principle. It applies to TT (EE) type installations.
After connecting the unit to a 2P+E socket the earth resistance value is displayed.
Standard NF C15-100 requires a value of earth resistance of less than 100
Ω.
If this value is obtained, the backlighting is in blue, if the value is above 100
Ω, the screen turns
red:
Fig.1; value OK, Fig.2: value not OK
Your instrument measures values up to 1999
Ω. Above that, the display indicates OL (overload =
value exceeded).
Fig.3: Earth resistance greater than 1999
Ω.
