HT instruments SIRIUS87 - Manual (Page 35)

SIRIUS 87
EN - 33
4.4. LOOP : LOOP IMPEDANCE, FAULT CURRENT AND PHASE
SEQUENCE TEST
Turn the
switch on LOOP
position.
Switch on the instrument.
The key FUNC permits to select one of the following measuring modes
(which can be shown cyclically when pressing the key):
 Mode “
P-N” (the instrument measures the resistance between the phase
and neutral conductors and calculates the phase to neutral prospective
short circuit current).
 Mode “ P-P” (the instrument measures the resistance between two phase
conductors and calculates the phase to phase prospective short circuit
current).
 Mode “ P-PE” (the instrument measures the resistance between the
phase and protective conductors and calculates the phase to earth
prospective short circuit current).
 Mode “
” (the instrument detects the phase sequence and measures
the three delta voltages: L1-2, L2-3, L3-1).
CAUTION
The display of “Measuring” means that the instrument is measuring. During
this phase never disconnect test leads.
FUNC