HT instruments HT712 User Manual
Page 12
HT712
EN - 11
8. Disconnect the test probe to the L1 phase cable (at this point the “PH” disappears).
The symbol "
L2
" means that the instrument is waiting for the second phase to be
measured.
For the phase rotation test:
9. Connect the test probe to the L2 phase cable or simply lean it to the insulated cable
under test.
For the phase concordance test:
9. Connect the test probe to the L1 phase cable of the second three phase system or
simply lean it to the insulated cable under test.
10. When an input voltage higher than 100V is detected, the buzzer beeps and the
message “
PH
” is displayed. In this case do not press any key and keep the test probe
connected to the phase cable.
11. After about one second the symbol “MEAS“ appears on the display indicating that the
instrument is performing the second measurement.
CAUTION
Be quick. If you wait more than 10 seconds between the first and the second
measurement the instrument displays the message “
SEC
” and it’s necessary
to repeat all measurements again. In this case press the “
” function key
and restart from step 1.
12. The test result is displayed. If the phases to which the probe is connected
• belong to the same phase, the instrument displays “
1.1.-.
”, and lights the green LED
• follow the correct sequence, the instrument displays “
1.2.3.
” and lights the green LED
• follow the incorrect sequence, the instrument displays “
2.1.3.
” and lights the red LED
13. To perform a new test press “
” and restart from point 1.
CAUTION
• The detected voltage is NOT the phase to neutral voltage, but the voltage
between the conductor and the operator who is holding the instrument. This
value can be lower than the phase to neutral voltage. DO NOT TOUCH
THE PHASE CABLE IF YOU ARE NOT SURE WHETHER VOLTAGE IS
PRESENT OR NOT
.
• If the operator is insulated from the ground (e.g. insulated floors, shoes with
rubber soles etc.) the instrument may not measure correctly.
• We recommend to repeat the test at least twice to make sure that the
detected value is correct.