HT EQUITEST 5071 User Manual page 30

At the end of the test,
the instrument gives out
a double sound to
indicate that test has
been
performed and
following
appears on the display.
Operating mode
N.B. In TT systems, the value of overall earth resistance may be considered similar to
the value of Phase-Earth fault loop impedance, measured by the instrument.
Therefore, in compliance with standards, the measured value may be taken as the
value of the system's earth resistance.
Formula used for calculating the assumed short-circuit current:
where:
100< V
6. The results can be saved by pressing the SAVE key twice (see § 7.1).
LOOP
correctly
the
Freq=50.0HZ
screen
VP-N=231V

R
A
FUNC
I
 150
mis
Z = measured Phase-Earth impedance
PE
30.11.12
1.07

215A
Vp-PE=231V
U

N
CC
Z
PE
U = Phase-Earth voltage 127 if
N
230 if 150V< V
EN - 28
EQUITEST 5071
Value of Phase-Earth
resistance expressed in 
Value of the assumed Phase-
Earth short-circuit
calculated using the formula
reported below
 260
mis
current