HT Instruments HT10 Bedienungsanleitung Seite 32

5.4. AC VOLTAGE WITH LOW IMPEDANCE VALUE
•
The maximum input for AC Voltage is 1000V. Do not
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
installations. Due to the lowered internal impedance,
capacitive
reading shows the actual voltage applied. Similarly,
measuring phase (L1) on earth wire (PE) may trigger
fault-current circuit breakers (RCD)
1. Perform the preliminary Autotest function (see § 5.1)
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
turn on. This is not a device problem
7. Press the H/ key to activate/deactivate the HOLD function at
display. Press
activate/deactivate the display backlight
8. Press the / key to activate/deactivate the white LED torch
32
CAUTION
is particularly
voltage effects
and hold the H/
HT10
useful for testing
are suppressed. The
or can
key in order to