HT instruments HT9 - Manual (Page 10)

HT6-HT8-HT9
EN - 9
5.3. PHASE SEQUENCE
WARNING
 The maximum input AC and DC voltage is 690V. Do not measure
voltages exceeding the limits given in this manual. Exceeding these
limits could result in electrical shocks to the user and damage to the
instrument.
 Correct indication is only guaranteed for AC voltage in a range between
100V and 690V and with a frequency between 50Hz and 60Hz on three-
phase 4-wire electrical systems.
 The quality of the indication cannot be reliable if you work under
unfavourable conditions such as, for example, on wooden ladders, in
rooms with insulated floors, etc.
Fig. : 5: Phase sequence function
1. Touch the contact “Electrode” with a finger
(see Fig. : 1– no. 6).
2. Connect the measuring lead L1 onto
Phase L1 and the measuring lead L2 onto
Phase L2 of the three-phase system being
tested. The test is only carried out by
contact between the lead and the metal
part of the conductor.
3. The instrument turns on automatically and
the led (clockwise rotation) turns on in
case of correct sequence.
The
led (counterclockwise rotation)
turns on in case of incorrect sequence.
In case of measurements in environments with
poor light, press the Torch button (see Fig. : 1
– no. 7) to activate the white LED pointer.