When connected to all conductors of a three phase system, the instrument
automatically displays the sequence of phase rotation.
To determine phase sequence
1. Connect the Installation Testers as follows:-
Line 1 Red lead to Red phase
Line 2 Green lead to Yellow phase
Line 3 Black lead to Blue phase
2. The symbol is displayed will show the phase sequence:
indicates R – B – Y sequence (or 1:2:3)
indicates R – Y – B sequence (or 1:3:2)
NOTE: If one of the lines is faulty, neither of the symbols is displayed and
just the normal ‘neon’ polarity indication is shown.
16
FREQUENCY HZ (LT320 and LT330) PHASE SEQUENCE (LT320 and LT330)
To measure the frequency of the electrical supply:
1. Set the instrument to the [Hz] range.
2. Connect the GREEN or (L0) lead to the protective Earth (PE) and the
RED or (L1) lead to the phase to be measured.
3. The instrument will display the frequency in Hz.
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