For the determination of phase conductors
and phase sequence by using the accessible
electrode, the perceptibility of the display
may be impaired, e.g. when using protection
means against direct contact, in unfavourable
locations, for example on wooden ladders or
insulating floor coverings, as well as in
The voltage tester may only be dismantled by
authorised personnel.
Voltage testers must be clean and dry.
Particular notice for load tests
The connection line gets hot during extensive
load tests. Do not bend, wind up, knot or put it
around your neck. Tests with connected load may
be carried out within the voltage range up to
230 V, only. While doing several load tests in a
row, cool down intervals are necessary.
3. General information
The Prüfball ZAP is equipped with push-buttons on
both handles. With actuation of the push-buttons,
the measuring system and load are connected.
The double-switching probe below the display
is used for optional connection of the measuring
element with or without the load test.
Without pressing the push-buttons voltage is
indicated by LEDs and the LCD indicator. Without
pressing the push-buttons the instrument performs
high-resistance tests and while pressing them, low-
impedance tests are performed.
4. Testing
4.1 General Information
When the push-buttons are not pressed, voltage is
signalised by three LEDs and the LCD indicator.
You can also determine phase, phase sequence and
continuity. The measuring element is switched on
when you press both buttons. Consequently the
testing-current becomes low-resistive.
While pressing the double-switching probe on the
left side of the display, the measuring element is
activated. Load of 350 W is additionally activated by
pressing the double-switching probe on the right.
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4.2 Testing correct display and function (Self-test)
In accordance to DIN VDE 0105 part 1 voltage te-
sters must be tested if they function correctly just
before it is used for determining zero-potential.
Step 1 – Test of the measuring element
Press the button of the display without holding
the test electrodes togther, the resistance symbol
Ω must appear on the LCD indicator.
Step 2 – Checking the line
Both electrodes are held together without pres-
sing the switching probes,
the resistance symbol Ω
must appear on the LCD indicator.
Step 3 – Test of the indication
Check the function of the indication at a known
voltage source, e.g. a 230 V socket.
Attention!
If one of the displays fails during the self-test – even
if only partial failure occurs – or if the instrument
does not indicate a function standby, the voltage
tester may not be placed into operation!
