VT12
VOLTAGE TESTER
Instruction
Manual
ALWAYS READ THESE INSTRUCTIONS
BEFORE PROCEEDING
Thank you for buying one of our products. For
safety and full understanding of its benefi ts
please read this manual before use. Technical
support is available from 01923 441717 and
support@martindale-electric.co.uk.
CONTENTS
1 Safety Information 1
1.1 Meaning of Symbols and Markings 1
1.2 Precautions 2
1.3 Safety Advice 3
2 Introduction 5
2.1 Inspection 5
2.2 Description 5
2.3 Accessories 5
2.4 Battery Installation 5
3 Operation 6
3.1 Description of VT12 Elements and LED 6
Indicators
3.2 Low Battery Check 7
3.3 Operating Duty Ratio 7
3.4 Proving Check 8
3.5 Removable Probe Tip Covers 9
3.6 Testing for the Presence of Hazardous 9
Live Voltage
3.7 Interference (Phantom) Voltage 10
3.8 Single Pole Phase Test 10
3.9 Testing for Continuity 10
4 Maintenance 11
4.1 Battery Replacement 11
4.2 Periodic Testing 11
4.3 Cleaning 11
4.4 Repair & Service 11
4.5 Storage Conditions 11
5 Warranty 12
Specifi cations
1. SAFETY INFORMATION
REMEMBER: SAFETY IS NO ACCIDENT
These instructions contain both information
and warnings that are necessary for the safe
operation and maintenance of this product. It
is recommended that you read the instructions
carefully and ensure that the contents are
fully understood. Failure to understand and to
comply with the warnings and instructions can
result in serious injury, damage or even death.
Particular attention should be paid to the
Warnings, Precautions and Technical
Specifi cations.
Please keep these instructions for future
reference. Updated instructions and product
information are available at:
www.martindale-electric.co.uk
1.1 Meaning of Symbols and Markings
Caution - risk of danger & refer to
instructions
Caution - risk of electric shock
Equipment protected by double or
reinforced insulation (Class II)
Suitable for live working
Alternating current (AC)
CAT II (Measurement Category II) is applicable to
test and measuring equipment connected
directly to utilization points (socket outlets
and similar points) of the low-voltage MAINS
installation.
CAT III (Measurement Category III) is applicable
to test and measuring equipment connected
to the distribution part of the building’s low-
voltage MAINS installation.
CAT IV (Measurement Category IV) is applicable
to test and measuring equipment connected
at the source of the building’s low-voltage
MAINS installation.
For further information on measurement categories
visit www.martindale-electric.co.uk/measurement_
categories.php.
Equipment complies with relevant EU
Directives
End of life disposal of this equipment
should be in accordance with relevant
EU Directives
1
1.2 Precautions
This product has been designed with your
safety in mind, but please pay attention to
the following warnings and cautions before
use.
Warnings
In order to avoid the danger of electrical
shock, it is important that proper safety
measures are taken when working with
voltages exceeding 30V AC rms, 42V AC
peak or 60V DC.
Where applicable other safety measures
such as the use of protective gloves, goggles
etc. should be employed.
The voltage tester must only be used by a
skilled and competent person who is familiar
with the relevant regulations, the safety risks
involved and the consequent normal safe
working practices.
Before each use the voltage tester should
be examined for damage, cracks, cuts or
scratches to the housing, cable and prods.
The cable has black outer and contrasting
inner insulation, to allow damage to the
cable to be easily identifi ed. If there is any
doubt the voltage tester should not be
used.
Make sure the voltage tester is dry, clean
and free from dust, grease and moisture
while in use to avoid the danger from electric
shock due to surface leakage.
Before and after each use, the voltage tester
must be proven using a suitable proving
device or a known good voltage source. Do
not use the voltage tester if any expected
LED’s fail to illuminate correctly during
proving.
Testing for a voltage that exceeds the
specifi ed limits of the voltage tester may
damage the voltage tester and may expose
the operator to a shock hazard. Always
check the voltage tester’s specifi ed limits
before use.
The voltage tester must only be used in low
voltage systems of CAT IV up to 300V, of
CAT III and CAT II up to 690V, and within the
operating temperature and humidity range
specifi ed.
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If the probe tip shrouds are not fi tted, great
care must be taken when testing CAT III
and CAT IV installations to avoid the risk of
shorting high energy circuits and arc fl ash.
Do not use the voltage tester in damp
conditions.
Do not use the voltage tester if the battery
casing is not fi tted.
Always keep your fi ngers behind the fi nger
guards. Never touch the exposed metal prod
tips.
The different indicating signals of the voltage
tester (including the ELV limit indication) are
not to be used for measuring purposes.
The voltage tester must not be dismantled
or modifi ed in any way by unauthorized
persons. The safety of the voltage tester
cannot be guaranteed under such
circumstances and it must not be used.
Cautions
Avoid severe mechanical shock or vibration
and extreme temperature.
If the voltage tester has been stored or
transported in temperatures outside its
normal operating range it should be given
suffi cient time to stabilise in the environment
where it is to be used. An acclimatisation
time of at least 2 hours is required prior to
operation of the voltage tester.
To avoid possible corrosion from leaking
batteries, remove the batteries if discharged,
or when the unit is not in use for an
extended period.
1.3 Safety Advice
Depending on the internal impedance of
the voltage tester there will be a different
capability of indicating the presence or
absence of operating voltage in case of the
presence of interference voltage.
When the indication “voltage present”
does not appear, it is highly recommended
installing earthing equipment before work.
A voltage tester of relatively high internal
impedance, compared to the reference value
of 100k:, may not permit to clearly indicate
the absence of operating voltage in case of
the 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 confi rming by another means
(e.g. use of an adequate voltage detector,
visual check 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.
A voltage tester declaring two values
of internal impedance has passed a
performance test of managing interference
voltages and is (within technical limits)
able to distinguish operating voltage from
interference voltage and has a means to
directly or indirectly indicate which type of
voltage is present.
A voltage tester of relatively low internal
impedance, compared to the reference value
of 100k:, will not indicate all interference
voltages having an original voltage value
above the ELV level. 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.
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