Iso-Tech IPM 138 Instruction Manual page 19

a. If it displays " 1.2.3 ", then the phase sequence is a forward
sequence, which means the supposed phase 1 is ahead of
the supposed phase 2.
b. If it displays " 3.2.1 ", then the phase sequence is reversed
sequence, which means the supposed phase 2 is ahead of
the supposed phase 1.
c. If the display shows "－－－－" means it is unable to judge.
d. If the display shows "Lo V", it is possible the test leads
were removed before the instrument could determine the
correct sequence. Repeat the test.
6. Press Blue button to repeat the test.
5. °C/°F Measurement
EN-19