HT instruments MACROTEST 5035 - Manual (Page 31)

MACROTEST 5035
EN - 30
4.4. LOOP : LINE/LOOP IMPEDANCE MEASUREMENT AND
PROSPECTIVE SHORT CIRCUIT CURRENT
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.
4.4.1. High resolution Impedance measurement (0.1m
Ω)
Macrotest5035 is connectable to an external optional accessory (IMP57) useful for high
resolution impedance measurement close to a power transformer.
The high Resolution impedance measurement is available inside the
LOOP P-P, P-N, P-PE
modes by mean
Un/I∆n key.
If You enable the High Resolution Impedance Measurement mode without connecting IMP57
the following screen will be displayed:
LOW Ω LOOP
o
!!
no
con ins
!
For further details regarding IMP57 use and technical characteristics please refer to IMP57
user's manual or HT web site
www. htitalia.com.
FUNC