Fluke Fluke 4325162 User Manual

27 

As all four pylon stubs are connected to the foundation earth of the pylon, the measuring 
current I

meas

 is divided into five components according to the present resistances 

involved. 

One part flows via pylon construction to the overhead earth wire and further to the 
parallel circuited pylon earthing resistances.  

The other four current components (I

1

4

) flow via each individual pylon foot. 

The addition of all currents result in a current I

E

 going through the earthing resistance, for 

example, the resistance of the "composite" earth electrode to the soil. 

If the current transformer is fixed to each pylon stub, one after the other, four resistances 
have to be measured which show a behavior inversely proportional to the corresponding 
current components I

1

4

. The feeding point of the measuring current is to be left 

unchanged to avoid a change in the current distribution. 

Accordingly, these equivalent resistances are displayed as: 

=

 

Therefore the earthing resistance R

E

 of the pylon is determined as a parallel circuit of the 

individual equivalent resistances: 

4

3

2

1

1

1

1

1

1

+

+

+

=

 

1.  Turn central rotary switch to position “R

E

 3pole" or R

E

 4pole". The instrument 

is wired according Figure 7 and messages on the display. 

A flashing of the sockets symbols  or , points to an incorrect or 
incomplete connection of the measuring lead. 

2.  Apply current transformer to the pylon stub. Make sure that the transformation ratio 

set on the instrument corresponds to the current transformer used. Change settings if 
necessary (see “Changing of All Data Settings with Personalized CODE”). 

3.  Press “START TEST” button.  

Now a fully automated test sequence of all relevant parameters like auxiliary earth 
electrode, probe and earth electrode resistances, is implemented and finishes with 
the display of the result R

E

.  

4.  Read out measured value R

E

.  

5. Call 

R

S

 and R

H

 with “DISPLAY MENU”.