HT instruments HT4022 - Manual (Page 52)

HT4020 - HT4022
EN - 19
4.3.10.1. Detection of phase coincidence with 1 wire method
CAUTION
 The purpose of this measurement is to verify the correct phase between 2
conductors before executing a parallel connection
 The maximum Voltage input is 600V. Do not attempt to take any voltage
measurements exceeding the limits indicated in this manual. Exceeding
the limits could cause electrical shock or damage to the instrument
 During this measurement the instrument must be always held in the
operator’s hand and the test lead cable must not be in contact with or near
to any voltage source that, due to instrument sensitivity, can abort the
measurement
Fig. 14: Use of instrument for phase coincidence indication with 1 wire
1. Select the “ ” position. The symbol “ 1
PH ” is shown on the secondary display
2. Insert the red plug into V/
 jack
3. Connect the red terminal to the L1 phase conductor of the first 3-phase system (see
Fig. 14 – left part). If necessary use the rubber cup to insert red test lead
4. When an input voltage >80V is detected the buzzer sounds and the symbol “PH” is
shown on the main display. Don’t press any key and keep the test lead connected to L1
phase cable
CAUTION
If the input voltage value is < 80V the instrument doesn’t show “PH” symbol
and it’s not possible to execute the phase rotation detection.
5. After about one second “MEASURING“ appears on the display indicating that the
instrument is ready to execute the first measurement (see Fig. 14 – left part)