HT instruments SIRIUS87 - Manual (Page 48)

SIRIUS 87
EN - 46
3. The
key
U
L
t permits to select one of the following limit values for the
contact voltage (which can be shown cyclically when pressing the key):
 50V (default)
 25V.
4. Press
the START/STOP key. The instrument starts the test.
 At the end of the test the instrument
emits a
double sound signal
indicating that the test is correctly
terminated and displays the values
alongside.
RCD LOOP

49

P-PE

223
V

4
A
Note: The test permits to effect the measurement of Global Earth Resistance without
causing RCD tripping in case of RCD with rated I N higher than or equal to 0.03A.
Formula for the calculation of the prospective short circuit current:
A
N
CC
R
U
I

where U
N
= phase to earth voltage 127V if 100V < V
meas
 150V
230V if 150V < V
meas
 265V
R
A
= global earth resistance
CAUTION
The display of
“Measuring” indicates that the instrument is effecting the
measurement. During this phase do not disconnect the test leads from the
instrument.
SAVING: The tests can be stored pressing the SAVE key twice
(according to § 5.1).
Value of Global
Earth Resistance
expressed in
.
Resolution is 1
.
Value of phase to
earth voltage
detected during
the measurement.
Resolution is 1V.
Effective value of the phase to earth prospective
short circuit current expressed in Ampere
calculated according to the following formula.
Resolution is 1A.
SAVE
START
STOP
U
L
▼