HT instruments HT9 - Manual (Page 8)

HT6-HT8-HT9
EN - 7
5. INSTRUMENT FUNCTIONS
5.1. VOLTAGE MEASUREMENT AND POLARITY INDICATION
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.
 The Dangerous voltage led (see Fig. 2 – no. 5) lights up and the buzzer
sounds, in case of voltage between terminals >50V AC or >50V DC,
even in case of low battery charge or when no batteries are installed
(without batteries the buzzer does not sound).
 After a lamp test it is necessary to wait 5 seconds before being able to
perform a voltage measurement.
Fig. : 3: Voltage measurement
1. Connect the measuring leads L1 and L2 to
the object to be tested. Measurement is only
carried out by contact between the leads
and the metal parts of the conductors
.
2. The instrument automatically switches on and
the measured voltage value is indicated when
the leds turn on and, for models HT8 and
HT9, also on the LCD display (see Fig. 2 –
nos. 1 and 8).
3. While measuring, the instrument could also
show leds or on. This is no indication
of malfunction.
Polarity is indicated as follows (see Fig. 2 – no.
7) :
 AC: leds + and – 12V are on;
 +DC: led +12V is on (lead L2 connected to
positive pole);
 -DC: led -12V is on (lead L2 connected to
negative pole).
In case of measurements in environments with
poor light, press the Torch button (see Fig. : 1 –
no. 7) to activate the white LED pointer.