HT7
EN - 10
4.8. PHASE SEQUENCE INDICATION
CAUTION
The maximum input for AC voltage is 690V. Do not measure higher
voltages to avoid risks of electrical shocks or serious damages to the
instrument.
symbol is lighted up whenever the voltage between the probes
exceeds 50V, even if the batteries are low or have been removed.
Fig. 6: Phase sequence test
1. Perform the preliminary Autotest (see § 4.3).
2. Connect the L1 probe to phase 1 and the L2
probe to phase 2 of the three-phase system
under test (see Fig. 6). The measurement is
performed
only when probes are in
contact to live conductors.
3. The instrument turns automatically on and
the measured AC voltage value is displayed
both in numerical and bargraph modes
.
4. AC symbol is displayed. LEDs
and
are lighted up for AC voltage measurements
from 100V to 690V, 50/60Hz
.
5.
symbol (clockwise) and
symbol
(counterclockwise) are displayed according
to the phase sequence detected.
6. Connect the L1 probe to phase 2 and the L2
probe to phase 3 of the three-phase system
under test.
symbol (clockwise) and
symbol (counterclockwise) are displayed
according to the phase sequence detected.
7. Connect the L1 probe to phase 2 and the L2
probe to phase 3 of the three-phase system
under test.
symbol (clockwise) and
symbol (counterclockwise) are displayed
according to the phase sequence detected.
8. Press the
key to switch on the white
LED illuminator to perform measurements in
dark environments.
