Major tech MT473 User manual

2018
User Manual
Voltage Tester
MT473

Index
Page no
3

Warning of a potential danger, comply with instruction manual.
Caution! Dangerous voltage. Danger of electrical shock.
Double insulation.
Important information. Consult the instruction sheet
Hazardous Voltage.
Suitable for live working.
This product complies with the WEEE Directive (2012/19/EU)
Conforms to European Union Directives.
TUV Association for Electrical, Electronic & Information Technologies;
following rules of "Geprüfte Sicherheit
Measurement Category Ill is applicable to lest and measuring circuits
connected to the distribution part of the building's low- voltage MAINS
installation.
Measurement Category IV is applicable to test and measuring circuits
connected at the source ol the building's low-voltage MAINS installation.
1. Safety
1.1 International Safety Symbols
CAT III
CAT IV
1.2 Safety Notes
• Reference. Please use utmost attention.
• Do not exceed the maximum allowable input range of any function
• Insulated personnel body protective equipment up to 1000V.
• The unauthorized persons are not to be allowed to disassemble the voltage
detector 4

In order to avoid electrical shock, the valid safety and VDE regulations
regarding excessive contact voltages must receive utmost attention,
when working with voltages exceeding 120V (60V) DC or
50V (25V) rms AC. The values in brackets are valid for limited ranges
(as for example medicine and agriculture).
1. Safety
1.3 Warnings
Prior to measurement ensure that the test leads and the lest instrument
are in perfect condition.
When using this instrument only the handles of the probes may be
touched - do not touch the probe lips.
This instrument may only be used within the ranges specified and
within low voltage systems up to 1 000V.
Prior to usage ensure perfect instrument function (e.g. on
known voltage source).
The voltage detector is not to be used if the battery box is open.
The voltage detectors have to be kept dry and clean.
The voltage testers may no longer be used if one or several
functions fail or if no functionality is indicated.
Do not use this instrument under damp conditions.
Perfect display is only guaranteed within a temperature range of
-10°C up to +55°C, at relative humidity question <85%.
If the operator's safety cannot be guaranteed, the instrument must
be removed from service and protected against use.
5

1. Safety
1.4 The safely can no longer be insured if the instrument:
• Shows obvious damage
• does not carry out the desired measurements
• has been stored for too long under unfavorable conditions
• has been subjected lo mechanical stress during transport.
All relevant statutory regulations must be adhered to when using this
instrument
1.5 Safety Advices
• Depending on the internal impedance of the voltage detector there will
be a different capability of indicating the presence or absence of
operating voltage in case of the presence of interference voltage.
• A voltage detector of relatively low internal impedance, compared to the
reference value of 100kΩ, 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 detector may discharge
temporarily the interference voltage lo a level below the ELV, but it will
be back to the original value when the voltage detector is removed.
• When the indication "voltage present" does not appear, it is highly
recommended installing earthing equipment before work.
• A voltage detector of relatively high internal impedance, compared lo !he
reference value of 100kΩ, 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 of 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 conclude
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
6

2. Appropriate Usage
The instrument may only be used under those conditions and for those
purposes for which it was designed. For this reason, in particular the
safety references, the technical data including environmental conditions
and the usage in dry environments must be followed,
When modifying or changing the instrument, the operational safety is no
longer ensured.
The instrument may only be opened by an authorized service technician.
The voltage detectors are designed to be used by skilled persons and in
accordance with safe methods of work.
3. Specifications
7
LEDS
LED voltage range 12V to 1000V AC/DC
LED resolution ± 12,24,50,120,230, 400, 690,1000V AC/DC
Tolerances Complies with EN 61243-3:2014
Frequency range 40Hz to 400Hz
Response times ≤1 second
Auto power on Auto power on ≥12V AC/DC
Voltage detection automatic
Polarity detection Full range
Range detection Automatic
Internal basic load Maximum 3.5 mA at 1000 V
impedance Peak current 350 kΩ / ls<3.5 mA (no RCD tripping)
Operation lime Duration Time = 30 seconds
Recovery time Recovery Time = 240 seconds
Continuity Test 0 to 400 kΩ
Accuracy nominal resistance +50 %
Test current ≤5 µA

3. Specifications
Switchable Load ~7KΩ
Peak current Is (load)=150mA
RCD tripping ~30mA@230V
Single-pole Phase Test 100V to 1000V AC
Frequency range 50 Hz to 60 Hz
Rotary Field Indication
Voltage range (LEDs) 100... 1000V
Frequency range 50/60Hz
Measurement principle Double-pole and contact electrode
Safety standards EN61243-3:2014
Agency approvals TÜV-GS
Overvoltage protection 1000V AC/DC
Measurement category CATIII 1000V/CATIV 600V
Protection degree IP64
Power supply 2x1.5V "AAA" Batteries
Power consumption max.30mA / approx. 250mW
Temperature range -10°C up to 55°C
Humidity max.85 % relative humidity
8

4. Voltage Tester Description
9

5. Operation
5.1 Preparing the test
• Prior to every test, please ensure that the instrument is in perfect
condition:
• For example, keep an eye out for a broken housing or leaking batteries.
• Always carry out a function test before using the voltage tester, see
below.
• Check that the instrument is functioning properly(for example at a known
voltage source)before and after every test.
• If the safety of the user can not be guaranteed, switch off the instrument
and secure it to prevent unintentional usage.
• Carrying out a function test
•When press "Autotest" button, with the exception of the LED for low
impedance test, all LEDs should light up. If the battery voltage is too low,
all leds will blink, please replace the battery
5.2 Preparing the test
• Connect both test probes with power source.
• As from a voltage of > 6V the voltage tester
switches on automatically.
• The voltage is displayed via LEDs.
• The different indicating signals of the voltage
detector (including the ELV lim indication)are not
to be used for measuring purposes.
• For AC voltage, the "AC" is illuminated.
• For positive voltage, the "+" is illuminated.
• For negative voltage, the "-" is illuminated.
• In the case of DC voltage, the polarity of the
indicated voltage relates to the voltage tester probe tip
• Once the safety extra-low voltage (50V AC /120V DC) is reached or
exceeded, the " " is illuminated, in the event of no battery power or
main circuit failure, an acoustic signal is emitted.
10

5. Operation
5.3 Single-pole phase Test
• The single-pole phase test is only possible when batteries are installed
and in good condition.
• The single-polephase test starts at an AC voltage of approx.100V
(pole>100V AC).
• When using single-pole phase tests to determine external conductors the
display function may be impaired under certain conditions (e.g. for
insulating body protective equipment on insulation locations).
• The single-pole phase testing is not appropriate to determine whether a
line is live or not. For this purpose, the double-pole voltage test is always
required.
• Connect both test probes with power source.
• A signal sound indicates the phase.
• The " " LED is illuminated in the display
5.4 Continuity Test
• The continuity test is only possible when batteries are installed and in
good condition. A signal sound is audible for continuity and the LED for
continuity LED (6) is illuminated.
5.5 Voltage Test with Switched Load, RCD Trip Test
• During voltage tests, you can decrease the interference voltages from
inductive or capacitive coupling by loading the UUT with a lower
impedance than the Tester has in normal mode. In systems with RCD
circuit breakers, you can trip an RCD switch with the same low
impedance as when you measure voltage between L and PE.
• To do an RCD trip test during voltage measurement, push the two low
impedance buttons (14)at the same time. If you have 10 mA or 30 mA
RCDs between L and PE in a 230 V system, it will trip.
• During load current, the indicator probe side vibrates and the low
impedance LED is the indication for the flowing load current. This
indication is not to be used for voltage test or measurement.
• If the two pushbuttons are not used, the RCDs will not trip, even in
measurements between L and PE.
11

5. Operation
5.6 Rotary Field Indication
• The voltage testers are equipped with a double-pole rotary field indicator.
• The rotary phase indication is always active. The symbols "R"or " I.:' are
always displayed. However, the rotary direction can only be determined
within a three-phase system. Here, the instrument indicates the voltage
between two external conductors.
• Connect the instrument test probe with the supposed phase L2 and the
handle test probe with the supposed phase L1.
The voltage and the rotary field direction are displayed. "R" signifies that
the supposed phase L1 is the actual phase L1 and the supposed phase
L2 is the actual phase L2.
12
"L" signifies that the supposed phase L1 is the actual phase L2 and the
supposed phase L2 is the actual phase L1.
When re-testing with exchanged test probes the opposite symbol has to
be illuminated.

5. Operation
5.9 Cleaning
Prior to cleaning, remove voltage test from all measurement circuits. If the
instruments are dirty after daily usage, it is advisable clean them by using
a damp cloth and a mild household detergent. Never use acid detergents
or dissolvents for cleaning.
After cleaning, do not use the voltage tester for a period of approx. 5
hours.
5.8 Maintenance
When using voltage testers in compliance with the instruction manual, no
particular maintenance is required. If functional errors occur during normal
operating, our service department will check your instrument without delay.
5.7 Measurement Point Illumination
Voltage testers are equipped with a measurement point illumination
feature. Thus, working under bad lighting conditions (e.g. division switch
cabinets) is made easier. Press button for measurement point illumination
(15) on instrument rear.
13
5.11 Battery Replacement
• If no signal sound is audible when short-circuiting the test probes or
display battery symbols on the screen, proceed with the battery
replacement.
• Completely disconnect voltage tester from the measurement circuit.
• Remove discharged screw , battery cover and batteries.
• Replace by new batteries, two type "AAA" by respecting correct polarity.
• Close the battery cover and re-screw the screw.

Rev. 160523
2018
T9 Industrial Village,
Sam Green Road, Tunney Ext. 9,
Elandsfontein, South Africa
P.O. Box 888, Isando 1600
South Africa
Telephone: [phone]
National Contact Number: 08 61 62 5678
Sales Facsimile: [phone]
Admin Facsimile: [phone]
E-mail: [email protected]