ICS Schneider Messtechnik HT10, Руководство пользователя

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HT10
EN - 10
5.3. AC VOLTAGE MEASUREMENT WITH LOW IMPEDANCE VALUE
CAUTION

The maximum input for AC Voltage is 1000V. Do not try to measure
higher voltages to avoid risks of electrical shocks or serious damages to
the instrument

Warning LED turns ON and the buzzer sound for voltage between
probes over 50V

This function is particularly useful for testing installations. Due to the
lowered internal impedance, capacitive voltage effects are suppressed.
The reading shows the actual voltage applied. Similarly, measuring
phase (L1) on earth wire (PE) may trigger fault-current circuit
breakers (RCD)
Fig. 6: AC Voltage measurement with low impedance value
1. Perform the preliminary Autotest function (see § 4.4)
2. Connect the
L1 and L2 probes to the object under test (see Fig. 6). The measurement
is performed only with contact of probes directly on metal parts of conductors
3. The LED and the “AC“ indication switch on, the AC voltage measurement is
displayed and an acoustic signal is emitted
4. Press the two switches (see Fig.1 - part 6) simultaneously. The applied voltage is
displayed both through red LEDs switching on and on the display. AC symbol is
displayed. The LED for low impedance test (see Fig.2 – part 2) switches on
5. The instrument turns automatically OFF as soon as probes are disconnected from the
object under test
6. For measurements in single-phase plants the LEDs or can turn on. This is not a
device problem
7. Press the H/ key to activate/deactivate the HOLD function at display. Press and hold
the H/ key in order to activate/deactivate the display backlight
8. Press the /

key to activate/deactivate the white LED torch