HT instruments HT712 - Manual (Page 11)

HT712
EN - 10
4.4.4. Phase sequence test and phase conformity test
CAUTION
The maximum input for AC voltage is 600V. Don’t try to measure higher
voltages to avoid risks of electrical shocks or serious damages to the
instrument.
L1
Fig. 6: Phase sequence test
and phase conformity test
1. Turn the selector on .
2. Keep the instrument gripped correctly (Fig. 6) by
touching the metallic pad with a finger.
3. The symbol " L1 " appearing on the display means that
the instrument is ready to perform the first
measurement.
CAUTION
During this measurement:
• the instrument must always be gripped by
the operator.
• owing to the instrument’s sensitivity, the
test probe must not get in touch with (or
simply must not be close to) any voltage
source that can affect or abort the
measurement.
For the phase rotation test:
4. Connect the built in probe to the L1 phase cable or
simply lean it to the insulated cable under test.
For the phase concordance test:
4. Connect the built in probe to the L1 phase cable of the
first three phase system or simply lean it to the
insulated cable under test.
5. 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 L1 phase cable.
CAUTION
If the input voltage value is lower than 100V the instrument doesn’t show
“
PH ” and it’s not possible to perform the phase sequence measurement.
6. After about one second the symbol “MEAS“ appears on the display indicating that the
instrument is performing the first measurement.
7. Once finishing the first measurement (which the operator performs without doing
anything) the green LED blinks and the buzzer emits an intermittent sound.