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Low-impedance voltage tester (impedance < 100 kΩ), inter-
ference voltage is suppressed or reduced:
A voltage tester of relatively low internal impedance, compared
to the reference value of 100 kΩ, will not indicate all interfer-
ence voltages having an original voltage value above the ELV
level (50 V AC/ 120 V DC). When in contact with the parts
to be tested, the voltage tester may discharge temporarily the
interference voltage to a level below the ELV, but it will be back
to the original value when the voltage tester is removed.
When the indication "voltage present" does not appear, it is
highly recommended to install earthing equipment before start-
ing work.
High-impedance voltage tester (impedance > 100 kΩ): Inter-
ference voltage will not be suppressed or reduced:
A voltage tester of relatively high internal impedance, com-
pared to the reference value of 100 kΩ, may not permit to
clearly indicate the absence of operating voltage in case of
presence of interference voltage. When the indication "voltage
present" appears on a part that is expected to be disconnected
from the installation, it is highly recommended to confirm by
another means (e.g. use of an adequate voltage tester capable
of distinguishing between operating voltages and interference
voltages, visual inspection of the disconnecting point of the
electric circuit, etc.) that there is no operating voltage on the
part to be tested and to conclude that the voltage indicated by
the voltage tester is an interference voltage.
Voltage testers capable of distinguishing between oper-
ating voltage and interference voltage by means of load
connection:
A voltage tester stating two values of internal impedance has
passed a performance test of managing interference voltages
and is (within technical limits) able to distinguish operating volt-
age from interference voltage and has a means to directly or
indirectly indicate which type of voltage is present.
Electrical symbols on the device:
Symbol
2.
Device description
1
Probe tip protector
2
Probe tip L1/-
3
Probe tip L2/+
4
LED measuring point illumination
5
Sensor of the cable break detector
6
LC display
7
Push-button
8
Handle L1
9
Display handle L2
J
LED step indicator
K
Red LED
L
Green LEDs ◄LR► of the phase sequence indication
(left/right)
M
Yellow LED Ω for continuity test (lights up)/cable break
detector (flashes)
N
Light sensor for LC display illumination
O
symbol for external conductor test (phase indication)
,
P
right)
Q
Display for voltage (V)/resistance (kΩ)
R
+/- of the polarity indication
V
/V
S
DC
AC
Frequency indication (Hz)
T
symbol for diode test
symbol for discharged battery
kΩ symbol for resistance measurement
3.
Functional test before use to ensure the absence of
voltage of an installation (figure A)
-
Check the voltage tester for correct functioning immedi-
ately before and after using it!
-
It must be possible to switch the voltage tester on as fol-
lows:
•
automatically, if a voltage of 6 V or more is applied to
the probe tips L1/-
•
by actuating the push-button
L2
•
by short-circuiting the probe tips L1/-
-
If the
battery must be replaced.
-
The device is switched off automatically after 10 seconds.
-
Activation of the self-test:
•
Short-circuit the probe tips L1/-
•
Press and hold the push-button
dle L2
•
The buzzer sounds and all segments of the LC dis-
play, all LEDs (running light) as well as the back-
10/2015
Meaning
Important documentation!
The symbol indicates that the guide described
in the manual, to avoid any risks
Device or equipment for working under voltage
Push-button
Alternating voltage (AC)
Direct voltage (DC)
Direct and alternating voltage (DC/AC)
Earth (voltage to ground)
Phase sequence indication; the phase se-
quence can be indicated only at 50 or 60 Hz
and in an earthed mains
This symbol shows the orientation of the batter-
ies for inserting them with correct polarity
for external conductor test (phase indication)
symbol of the phase sequence indication (left /
voltage type (direct/alternating voltage)
9
,
symbol
9
for approx. 3 seconds to start the self-test.
DUSPOL
2
and L2/+
7
is shown on the LC display
digital 1000
®
3
,
of the display handle
2
and L2/+
2
and L2/+
7
of the display han-
3
.
6
, the
3
.
8
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