Megger TPT420 User manual

TPT420
Two pole
voltage tester
User guide
Test Equipment Depot - 800.517.8431 -
5 Commonwealth Ave, MA 01801
TestEquipmentDepot.com

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References marked on
tester or in instruction
manual
GWarning of a potential danger, comply with
instruction manual.
FCaution! Dangerous voltage. Danger of
electrical shock.
Continuous double or reinforced insulation
complies with category II DIN EN 61140.
Equipment for working under live voltage
GSafety Warnings
GBefore commencing any testing, short the
prods together to check the batteries.
FThe TPT420 is designed to offer a high degree
of safety. It conforms to standards DIN VDE
0682-401 and IEC/EN 61243-3. To ensure
that the unit is operated safely, please read
the following instructions before using the
device.
■Do not use the instrument in a humid
environment.
■Before testing a live circuit the voltage
tester should be checked by connecting
to a known voltage source (e.g. a suitable
120 / 230 V outlet or a suitable proving unit)
before and after use.
■Tests for voltage should be made with both
poles.
■Extreme care must be taken when testing
voltages above 50 V AC / 120 V DC.
■Ensure the tester is only used within the
stated measurement ranges, in low voltage
installations up to 1000 V AC and 1500 V DC
and in the measuring category it has been
designed for.
■When testing, ensure hands are behind the
barriers on the main body and remote probe.
Avoid touching the tips.
■The instrument must be in good working
order and be clean and dry, with no broken
or damage to the leads, probes or case.
■Do not use the unit with the battery cap
removed and ensure when changing the
batteries no probe is connected to any
circuits.
■Do not use the instrument if one or more
functions are not working correctly.
■When testing, the warning triangle “F“
LED will illuminate, even in the event of the

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batteries being exhausted. This must not be
used for measuring purposes.
■The audible indication may not be heard in
noisy environments.
■Remove the batteries if the tester is not to be
used for a long period of time.
■The voltage tester must not be used with
exhausted or leaked batteries. Danger of
electric shock!
SAFETY ADVICE
■A voltage detector of relatively low internal
impedance, compared to the reference value
of 100 kΩ, will not indicate all interference
voltages or noise having an original voltage
value above the ELV level. When in contact
with the parts to be tested, the voltage
detector may reduce the interference voltage
or noise by discharging temporarily to a level
below the ELV, but it will go back to the
original value when the voltage detector is
removed.
■A voltage detector declaring two values
of internal impedance has passed a
performance test of managing interference
voltages or noice 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.
■When there is no indication of “voltage
present”, it is still recommended to earth
equipment before commencing work.
■A voltage detector of relatively high internal
impedance, compared 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
isolated from the installation, it is highly
recommended confirming 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
ensure that the voltage indicated by the
voltage detector is an interference voltage.
■A voltage detector 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.
General point: Voltage tests have priority on
the TPT420. That means that if life voltage is
detected this will be indicated. If no voltage is
detected at the probe tip (<6 V), the device is in
continuity mode.

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Introduction
The Megger TPT420 voltage tester provides
electricians and electrical engineers with voltage
indication and has additional functions / features
that makes the instrument more versatile.
The TPT420 features both LCD and LED displays
that provide AC and DC voltage measurement
from 12 to 1000 V AC and 1500 V DC and in
addition, a continuity function ranging from 0 to
500 kW. Continuity and voltage measurements
are accompanied by an acoustic sounder.
A bright LED torch feature allows safe working in
poorly lit environments.
When conducting a test between phase and
earth on a circuit protected by an RCD, RCBO
and Safety Breaker, the TPT420 will not trip
these devices.
The phase rotation indication function is
simplified which avoids the crossing of the test
probes adopted by some 2 pole testers.
With safety in mind, the TPT420 is CAT IV 1000 V
with an IP64 rated housing that provides an easy
and comfortable grip. GS38 shrouds are provided
as standard.
The unit has a feature that will warn the operator
of dangerous test voltages even when the
batteries have become exhausted.
Please note: To comply with GS38 (minimum
exposed tip) the metal caps on each prod must
be unscrewed and replaced with the supplied
plastic tip shrouds.
TPT420 Display
Voltage
LEDs
12 V &
polarity
LEDs
Low
battery
indicator
Digital
display
Sounder /
buzzer
Phase
rotation
LEDs
Voltage
warning
LED
Continuity
LED

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TPT420 Feature
Operating instructions
Auto-power-on / switching on
The tester switches on when it detects continuity,
an AC or DC voltage above approx. 10 V or a
live phase on L2 (single pole test). It can also be
switched on with the torch light button.
Auto-power off
The tester is automatically powered off after
5 sec when there is no signal detected by the
probes. The torch light switches off after approx.
10 sec.
TPT420 Voltage tester
CAT IV 1000V CAT IV 1000V CAT IV 1000V
GS38
UK tip
Hand
barrier
Remote
probe
1.2 metre probe lead
Battery
cap
Torch
button
Hand
barrier
Display
LED torch
Euro tip

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Self test
Before commencing any measurements with
the TPT420 a self test should be made. Short
the probes tips together; the continuity LED will
illuminate and a continuous audible tone will be
heard. This procedure checks the batteries have
sufficient power to operate the voltage tester
correctly.
CAUTION: This test does not indicate the tester
is capable of indicating correct supply voltage;
a known live supply or a dedicated proving unit
should be utilised to check the voltage measuring
capability of the unit before and after testing.
If only the voltage warning LED illuminates
(>50 VAC / >120 VDC) and the LCD display is
blank then check the batteries.
(This feature must not be used as a means
of continuing voltage indications.)
If the low battery indicator appears in the LCD
window then change the batteries.
Continuity test
Ensure the circuit under test is not energised.
Connect both test probes to the circuit. The
continuity LED illuminates and buzzer sounds
continuously to indicate continuity < 500 kW.
Note: No continuity measurement is available on
the LCD display.
Diode test
Connect the L1 - probe to the anode of the
diode and the L2 + probe to the cathode. The
continuity LED will illuminate and the buzzer will
sound. Reversing the connections, the continuity
LED will not illuminate and no sound will be
present.

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AC/DC Voltage test
Connect both probes to the circuit under test.
The voltage is indicated by LEDs and the LCD
display.
The buzzer sounds when a threshold voltage of
approximately 38 VAC or approximately 100 VDC
is exceeded.
Voltage polarity is indicated in following
manner.
AC: Both + and – 12 V LEDs are on.
+DC: +12 V LED is on.
-DC: -12 V LED is on.
When the L2 probe + is the positive (negative)
potential, the Polarity indication LED indicates
“+DC” (“-DC”).
During a voltage test, L or R LEDs may illuminate.
For voltages over 1000 V AC and 1500 V DC the
LCD will display ‘OL’.
Single-pole phase test
Hold the tester securely in your hand. Connect
the “L2 +” probe to the object under test.
Voltage warning LED lights up and buzzer sounds
when a voltage of approximately 100 V AC or
more exists in the object under test.
Function of this test may not be fully achieved if the
insulation condition / grounding conditions of user or
of the equipment under test are not good enough.
Note: Verification of live-circuits should not be
dependent on a Single-pole phase test only.

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Phase rotation test
L LED and R LED’s for the Phase rotation test
may operate on various wiring systems, but an
effective test result can only be obtained on
three-phase 4-wire systems.
Hold the tester and remote probe firmly in each
hand, ensuring hands are behind the hand
barriers, and connect the probes to the object
under test, each probe to one of the phases
that should be tested. Phase-to-phase voltage is
indicated by voltage LEDs and LCD display.
R LED lights up for Right rotary field. (L1, L2, L3)
L LED lights up for Left rotary field. (L1, L3, L2)
Measurement principle: The instrument detects
the phase rising order referencing the user as
earth. The function of this test may not be fully
achieved if the insulation condition/ grounding
conditions of user or of the equipment under
test are not good enough.
Torch light
Pressing the torch light button will turn on the
light and after approximately 10s it will turn
itself off.
Battery Replacement
Remove the probes from any testing point, when
opening the battery cap. Batteries are exhausted
when the “continuity/self” test with both test
probes connected cannot be achieved anymore.
A battery symbol + 1.5 V AAA - in the LCD display
indicates low battery.
Follow the procedure below and replace batteries
with new ones (type AAA / IEC R03 1.5 V).
Unscrew the battery cap, e.g. with a screwdriver.
Pull out the battery cap and replace the batteries.
Insert new batteries according to the engraving
on the battery cap and re-assemble battery cap.
Confirm that the battery cap is properly locked
prior to measurements.
- Conformity symbol, the instrument
complies with the valid directives. It complies with
the EMV Directive (2014/30/EU), Standard EN
61326-1 are fulfilled. It also complies with the
Low Voltage Directive (2014/35/EU),
Standard EN61243-3 is fulfilled.

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CAT IV - Measurement category IV: Equipment
connected between the origin of the low-voltage
mains supply outside the building and the
consumer unit.
CAT III - Measurement category III: Equipment
connected between the consumer unit and the
electrical outlets.
CAT II - Measurement category II: Equipment
connected between the electrical outlets and the
user’s equipment.
WEEE Directive
The crossed out wheeled bin symbol on the
instrument and on the batteries is a reminder not
to dispose of them with general waste at the end
of their life.
Megger is registered in the UK as a Producer
of Electrical and Electronic equipment. The
registration no is; WEE/DJ2235XR.
Users of Megger products in the UK may
dispose of them at the end of their useful
life by contacting B2B Compliance at www.
b2bcompliance.org.uk or by telephone on 01691
676124.
Users of Megger products in other parts of the
EU should contact their local Megger company or
distributor.
Battery Disposal
Batteries in this product are classified as Portable
Batteries under the Batteries Directive. Please
contact Megger Ltd for instructions on the safe
disposal of these batteries.
For disposal of batteries in other parts of the EU
contact your local distributor.
Megger is registered in the UK as a producer of
batteries.
The registration number is BPRN01235.
For Further information see www.megger.com

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Specifications
Voltage range: 12…1000 V AC
1500 V DC (40…400 Hz),
DC(±)
LED Nominal voltage: 12 / 24 / 50 / 120 / 230 /
400 / 690 / 1000 V, AC
(40…400 Hz), DC(±)
LED tolerances: According to EN61243-3
Voltage warning
indication LED <50 VAC, <120 VDC
Response time: < 1s at 100% of each
nominal voltage
LCD Range: 12…1000 V AC
1500 V DC (40…400 Hz),
DC(±)
LCD Resolution: 0.1 V
LCD Accuracy: ±3%±5dgt
LCD Over range
indication: “OL”
Peak current: Is<3.5 mA (at 1000 V)
Measurement Duty: 30 s ON (operation time),
240 s OFF (recovery time)
Internal battery
consumption: Approx. 80 mA
Single-pole phase
test voltage range: 100...1000 V AC
(50/60 Hz)
Phase rotation test: 120…400 V earth-to-
phase, AC 50/60 Hz
Continuity test: 0…500 kW+ 50%
Battery: 2 x 1,5V AAA, IEC R03
Temperature: -5…40 °C operation;
-20…70 °C storage,
No condensation
Humidity: Max 85 % RH
Altitude: Up to 2000 m
Over voltage: CAT IV / 1000 V
Safety Standard: EN61243-3
Pollution degree: 2
Protection: IP64
Dimensions: 67(W)x205(L)x19mm(D)
Weight: 180 g

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Repair and warranty
The instrument contains static sensitive devices,
and care must be taken in handling the printed
circuit board. If an instrument’s protection has
been impaired it should not be used, but sent for
repair by suitably trained and qualified personnel.
The protection is likely to be impaired if for
example; it shows visible damage; fails to perform
the intended measurements; has been subjected
to prolonged storage under unfavourable
conditions, or has been subjected to severe
transport stresses.
Note: Any unauthorised prior repair or
adjustment will automatically invalidate the
warranty.
Returning an Instrument for
Repair
If it is necessary to return an instrument for repair,
a Returns Authorisation number must first be
obtained by contacting one of the addresses
shown. You will be asked to provide key
information, such as the instrument serial number
and fault reported when the number is issued.
This will enable the Service Department to
prepare in advance for the receipt of your
instrument, and to provide the best possible
service to you.
The Returns Authorisation number should be
clearly marked on the outside of the product
packaging, and on any related correspondence.
The instrument should be sent, freight paid to the
appropriate address. If appropriate a copies of
the original purchase invoice and of the packing
note, should be sent simultaneously by airmail to
expedite clearance through customs.
For instruments requiring repair outside the
warranty period a repair estimate will be
submitted to the sender, if required, before work
on the instrument commences.

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Declaration of Conformity
Hereby, Megger Instruments Limited declares
that radio equipment manufactured by Megger
Instruments Limited described in this user guide is
in compliance with Directive 2014/53/EU.
Other equipment manufactured by Megger
Instruments Limited described in this user guide
is in compliance with Directives 2014/30/EU and
2014/35/EU where they apply.
The full text of Megger Instruments EU
declarations of conformity are available at the
following internet address: megger.com/eu-dofc.

M
Test Equipment Depot - 800.517.8431 -
5 Commonwealth Ave, MA 01801
TestEquipmentDepot.com