Benning DUTEST Mode D'emploi page 5

Instruction manual
DUTEST
Before you use the continuity and circuit tester
®
DUTEST : Please read the instruction man u a l and
make sure that you follow the safety in s truc t ions!
Index of contents:
1. Safety instructions
2. Mode of operation
3. Operating check/ commissioning
4. H ow to test an electrically conductive circuit
(continuity test)
4.1 H ow to test the continuity and reverse direc-
tion of semiconductors
5. Pocket torch function
6. Lamp replacement
7. Technical data
8. General maintenance
9. Environmental notice
1. Safety instructions
On the unit there are shown international electrical
sym bols with the following meanings:

Attention, read documentation!

Direct- or alternative current (DC/ AC).
Continuous double or strengthened isolation

(pro tection II, IEC 60536).
- This unit is built and tested in accordance with
DIN VDE 0403/ DIN VDE 0411- / EN 61010 part
1 and supplied in a sound condition. In order to
main tain this condition and to ensure a safe
opera tion, the user has to follow the instructions
and warnings which are included in this instruc tion
manual.
- This unit is provided for the use in accordance
with IEC 60664, category II. It is suitable for the
use in circuits up to 400 V
- The unit must only be used for the continuity
tes ting of electrical wiring, networks, systems,
equipment, components up to a nominal voltage
of 400 V and for the polarity determination of

se miconductors.
Max voltage from earth 300 V
- Handle the instrument only by the insulated grips
 and do not touch the test probes !
- A continuity and semiconductor test must not be
per formed on live equipment.
- Before opening the battery cover , the test grips
must be disconnected from all voltage sources
and measuring circuits.
The battery compartment cover underneath the
unit can be opened (by a 5,5 mm screwdriver).
To do this put the screwdriver in the slot at the
small side and remove the cover by a slight rotary
mo tion. Always insert the batteries with the correct
poles!
If the unit is not used for a long time, re move the
batteries from the unit!
Do not throw away used batteries, dispose these
as toxic waste!
- Please note that working on live circuits and
systems is always dangerous. Voltages from 30 V
AC and 60 V DC can be extremely dangerous to
the human body.
- Avoid getting the instrument wet or moist. It is al so
important to keep the continuity tester
clean!
- Avoid the development of water condensation.
This occurs if the unit is brought from the cold into
a warm environment. This can cause the in su la-
08/ 2010

®
.

!

ting strength to be reduced inside the unit and
errors in measurement can arise. If this happens,
the unit has to be kept for approx. 1 hour at a
higher temperature in a suitable place.
- If it is assumed that safe operation is no longer
pos sible, the unit has to be switched off and secu-
red against unintentional use.
It has to be assumed that a safe operation is no
lon ger possible,
- if the unit shows visible damages (housing,
ca ble, test grips),
- if the function of one or several displays fails
or the unit fails to function correctly,
- after long storage in unfavourable conditions,
- after stress due to transportation.
- For cleaning the unit use a cloth moistened with a
small amount of washing-up liquid. If battery elec-
trolyte has run out, thoroughly clean battery com-
partment and contacts!
Attention:
Immediately before use, ensure that the equipment is
not live! Please use a two-pole voltage tester for this
check, not the Dutest.
2. Mode of operation
The Dutest is a continuity and circuit tester in
ac cordance with VDE 0403, with visual and acoustic
test indication. The unit is designed for continuity tes -
ting of electrical wiring, networks, systems, equip ment
and components up to a measuring resistor value of
90 k. With this unit the polarity of semi conductor
components such as diodes, transistors, etc. can be
determined.
For operation 3 Mignon-batteries 1,5 V (IEC/ DIN R6/
LR6) are needed.
The unit has a visual indication with two LEDs 
and  and an acoustic indication by means of a test
buzzer.
The unit has two test leads  attached.
Each test grips  has an uninsulated test electrode
(test probe)  with a hole for the connection of single
wires up to 2,5 mm²  .
Different crocodile clips can be used on the test elec-
tro des (test probes) . The diameter of the test elec-
trodes is 4 mm. Via a switch  the unit can also be
operated as pocket torch.
Visual and acoustic indication
In the display window there is a torch reflector with a
bulb  on the right and two circular light lenses with
LEDs  and  on the left. The LED indications are
marked with the symbols "" and "k" and signal the
respective testing range. A test buzzer, which is inte-
grated in the unit, serves for the acoustic indication.
3. Operating check/ commissioning
- The unit may be only used for continuity test-
ing of dead electrical wiring, networks, systems,
equip ment and components as well as for po la ri ty
determination of semiconductor components!
- Before the commissioning of the unit, 3 Mignon-
batteries 1,5 V (IEC/ DIN R6/ LR6) have to be put
into the battery compartment. The battery com-
partment is behind the housing cover at the rear
of the unit. The housing cover has an opening
slot at both housing sides of the unit and can be
opened with a tool e. g. screwdriver.
- When putting in the 3 Mignon-batteries, pay atten-
tion to the correct polarity!
- Check the internal voltage supply of the tester and
with it the function of the LED-indications and the
test buzzer by touching together the two test elec-
trodes .
- Do not use the continuity tester unless all func-
tions are operating correctly!
DUTEST
®

3