Fluke Fluke 4325162 User Manual

23 

This measuring method has been created to measure single earth electrodes in 
permanently wired or mesh-operated systems (for example, a lightning protection system 
with several electrodes or high voltage pylons with earth cabling). By measuring the 
actual current flow through the earth electrode, this special measuring method provides 
the unique possibility to measure selectively only this particular resistance by means of a 
clip-on transformer (accessory). See Figure 5. Other parallel resistances applied are not 
taken into account and do not distort the measuring result.  

A disconnection of the earth electrode before the measurement is therefore no longer 
necessary. 

 

G

I

I

Z

tr

V

A

Aux. Earth
Electrode

Probe

I

3

U

meas.

R

E1

R

E2

R

E3

R

S

R

H

R

E3

 = 

U

meas.

I

3

= 

U

meas.

tr

. I

Z

 

edw014.eps 

Errors of the current transformer can be corrected as described in Clip-On Transformer 
Errors Correction.