Major tech MT195 User manual

INSTRUCTION MANUAL
CABLE LOCATOR
MT195

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Contents Page no Open-case Inspection ................................................................................................. 5
Safety Instructions ....................................................................................................... 6
1. Overview ................................................................................................................ 10
1.1 Product introduction ........................................................................................ 10
1.2 Characteristics of Cable Locator .................................................................... 11
1.3 Names and functions of parts ......................................................................... 12
1.3.1 Sketch of transmitter ............................................................................. 12
1.3.2 Transmitter display ................................................................................ 12
1.3.3 Sketch of receiver .................................................................................. 13
1.3.4 Receiver display .................................................................................... 14
1.3.5 Display of receiver under cable locating mode .................................... 14
2. Carrying out measurement .................................................................................... 15
2.1 Measurement precautions ............................................................................. 15
2.2 Functional principle ........................................................................................ 15
2.3 Examples of typical application ..................................................................... 17
3. Details of application ............................................................................................. 18
3.1 One-pole application ....................................................................................... 18
3.1.1 In open circuit ....................................................................................... 18
3.1.2 Locating and tracing of lines and sockets ........................................... 19
3.1.3 Locating of line interruptions ................................................................ 20
3.1.4 Locating of line interruptions using two transmitters .......................... 21
3.1.5 Error detection for an electrical floor heating ...................................... 22
3.1.6 Detect the narrow (blocked) part of the laid non-metallic pipeline ....... 24
3.1. 7 Detect the laid metal tap water pipe and metal heating pipe .............. 25
3.1.8 Detect the power supply circuit on the same floor .............................. 26
3.1.9 Track an underground circuit .............................................................. 27
3.2 Dual-pole applications .................................................................................... 28
3.2.1 Applications in closed circuits .............................................................. 28
3.2.2 Search for the fuses.............................................................................. 29
3.2.3 Search for short circuit in the circuit...................................................... 30
3.2.4 Detect circuits laid relatively deep ....................................................... 30
3.2.5 Classify or determine the laid circuit..................................................... 32
3.3 Method to increase the effective radius of detecting charged circuits............. 33
3.4 Identify voltage in the grid and search for breakages in the circuit.................. 34
4. Other functions....................................................................................................... 35
4.1 Voltmeter function of the transmitter............................................................... 35
4.2 Flashlight function........................................................................................... 35
4.3 Backlight function............................................................................................ 35
4.4 Buzzer function................................................................................................ 35
4.5 Automatic shutdown function........................................................................... 35
5. Technical parameters............................................................................................. 36
5.1 Technical parameters of transmitter ............................................................... 36
5.2 Technical parameters of receiver .................................................................... 36
6. Repair and maintenance ....................................................................................... 37
6.1 Troubleshooting .............................................................................................. 37
6.2 Checking of the fuse of the transmitter ........................................................... 37
6.3 Cleaning .......................................................................................................... 38
6.4 Replace the battery ......................................................................................... 38
6.5 Interval of calibration ....................................................................................... 39
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Contents Page no

Open-Case Inspection
When receiving this Cable Locator, please inspect it carefully to ensure no
damage has occurred during transport. Generally accessories, control
switches and connectors need to be checked. If there is any obvious
damage or functional failure, please contact your supplier.
Main parts:
1 - CD Bag
2 - Receiver: 1 pcs
3 - Transmitter: 1 pcs
Accessories:
4 - Crocodile clamps:
2 pcs (respectively
red and black)
5 - Battery: 1 pcs
(9V alkaline battery,
GL6F22A 1604A)
6 - Battery: 6 pcs
(1.5V AAA alkaline
battery, LR03 SIZE)
7 - User's manual:
1 pcs
8 - Test leads: 2 pcs
(1.5m long,
respectively red
and black)
9 - Test probe: 2 pcs
(respectively red
and black)
10 - Grounding rod
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Safety Information
This Cable Locator is produced in accordance with the safety
specifications for electronic meters and testing instruments and
has been completely tested before packing and transport.
Before using this device, please read this Manual carefully and
follow all of the instructions. Failure to adhere to these
instructions or ignoring the warnings and cautions herein may
lead to injury, threat to life or damage of equipment.
Definition Of Safety Symbols
This Manual includes the basic elements for safe operation and
maintenance of the cable locator. Before using the product, please read the
following safety instructions carefully.
Important information that users must read before using the
product.
lndicating that this terminal may be live.
Conformity symbol.
Table 1 : Safety Instructions
Incorrect operation may cause serious hurt or death.
Incorrect operation or carelessness may lead to personal
hurt, damage of this cable locator or error in the measured
results
Suggestions or tips for operation.
Table 2 : Warning Instructions

Attention!
Please observe the following instructions to ensure safe operation
and optimal performance.
1. Preliminary Inspection
Before the first use, please check whether the cable locator can function
normally and ensure it is not damaged during storage and transport. If there
is any damage, please contact the supplier.
Whenever you use the Cable Locator, the related safety
specifications in electronics industry must be abided by.
Temperature range for operation 0-40°C (32-104°C), <80%RH
(non-condensation)
Temperature range for storage -20-+60°C(-6-140°C F), <80%RH
(non-condensation)
2. Placement
To avoid failures or incidents, please don't place the cable locator
under the following environments:
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3. Use
The following instructions should be followed to avoid electric shock, short
circuit or explosion:
1. This cable locator can be directly used for live parts, but do take insulation
measures in accordance with industrial safety codes to avoid electric shock
and hurt.
2. To avoid electrical shock, the valid safety and VOE 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 (such as medicine and agriculture).
3. Never try to make contact between both battery cell poles, for example, by
using a wire connection. Never throw the batteries into fire, otherwise there
may be an explosion.
4. When replacing or changing the battery, make certain of correct polarity.
Batteries with reversed polarity can lead to instrument destruction.
Furthermore, they may explode or ignite.
1. Measurements in dangerous proximity of electrical installations
only under the direction of a responsible electrician.
2. When the product is used for testing a live line, do ensure the
test lead has been disconnected from the tested object before
connecting or disconnected the test lead of the transmitter.
3. Never try to disassemble battery cells! The battery contains
very strong base chemicals. If the battery contents come in
contact with skin or clothing, rinse immediately with water. If
the battery contents come in contact with the eyes,
immediately flush by using pure water and consult a doctor.
4. As the connection of the transmitter with the mains may
generate a circuit current of milliampere levels, in live condition
the Earth terminal of the transmitter can be only connected
with a neutral conductor. If transmitter connection is from the
phase towards the protective conductor, the functional safety of
the protective conductor must be tested first, in compliance
with DIN VDE 0100. The reason is that when connecting the
transmitter from phase towards earth, all parts being
connected to the earth may be live in the event of an error (if
the earth resistance does not comply with the regulations).
5. lf the operator's safety is no longer ensured, the instrument is
to be put out of service and protected against use. The safety
is no longer ensured, if the instrument:
♦ shows obvious damage.
♦ does not carry out the desired measurements.
♦ has been stored for too long under unfavorable conditions.
♦ has been subject to mechanical stress during transport.
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6. The instrument may only be used under those conditions and
for those purposes for which it was conceived. When modifying
or changing the instrument, the operational safety is no longer
ensured.
1. The working temperature of this Cable Locator is 0-40°C (32-
104°F).
2. To avoid damage, this device should be protected against
excessive mechanical vibration during handling or use,
especially dropping.
3. Only qualified Technicians are allowed to calibrate and repair
this instrument.
4. Prior to usage, inspect the instrument and the test lead in use
for external damage. Please ensure that the instrument and
the test lead in use are intact. The instrument should not be
used unless all the functions of the instrument are well
prepared for work.
5. When using the instrument, the rated voltage of the tested line
should not exceed the rated voltage specified in the technical
specifications of this Cable Locator.
6. Keep the instrument out of direct sunlight to ensure perfect
functioning and long service life.
7. If the instrument is subject to an extremely high
electromagnetic field, its functioning ability may be impaired.
8. Only use batteries as described in the technical data section.
9. Try to keep the battery away from humidity. If the display
shows a flickering battery symbol, the batteries must be
changed into new ones.
1. Before using a locator that has been placed or transported
under extreme climate conditions, please place it under a new
favorable environment for a certain period.
2. When the transmitter is connected with live mains, if the earth
terminal of the transmitter is connected with protective earth
phase, the current leakage (if any) in the power supply line
may join the circuit current of the transmitter, leading to
tripping of the leakage circuit breaker, i.e. tripping of FI/RCD.
3. Please maintain the original package well for later mailing
(such as for calibration of the instrument).
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1. OVERVIEW
1.1. Product Introduction
When you are making a hole in the wall for installation of an air conditioner
or on the floor for installation of a machine, or excavating a road, you have
to know the layout of the cables, water pipelines or gas pipelines in the
wall or ground to keep away from these facilities and avoid unnecessary
troubles and even dangers. In the past, there is only one solution for this
issue, that is, to find the construction drawings of these embedded
facilities. However, in most cases, these drawings cannot be found and you
have to take your chance, which may result in interruption of cables or
pipelines, bringing about the danger of power failure, electric shock,
explosion or threat to life.
This Cable Locator will effectively assist users to locate and detect cables,
accurately without having to guess the location.
This Cable Locator is a portable instrument consisting of a transmitter, a
receiver and some accessories. With advanced integrated parts and digital
circuit technologies, it is characterized by
highly stable and reliable electrical performance. The transmitter sends to
the target cable (or metal pipes) an AC voltage modulated by digital
signals, which generates an alternating electric field; Put the sensor head
of the receiver close to this electric field, and the sensor will generate
induced voltage. This instrument can magnify this weak voltage signal by
hundreds of times and then display it via an LCD screen after audio
frequency decoding, demodulation and digital processing, so that the
position of the buried cables or pipes, as well as their faults, can be
detected based on the change of the signal.
This Cable Locator is easy to use and provides convenient operation by
means of push buttons, which indicate effective pressing through a buzzer.
The display is visualized and the transmitter and receiver are equipped with
LED lamps. The transmitter not only transmits signals but also acts as an
AC/DC voltmeter, so that the instrument can display the voltage of the
tested line, including the AC/DC status, in addition to a warning symbol
when testing a live line.
The transmitter has a self check function which is shown in the display to
show whether the transmitter is transmitting signals. The display of the
receiver has backlights, so that users can see the testing results even in
dark areas. To improve the testing efficiency, the receiver is equipped with
a loudspeaker, which will give changing tones at the time of changed signal
intensity, so that users can judge the testing effects simply by sound. In
mute mode for both the transmitter and the receiver is provided to prevent
them from disturbing others when the instrument is used.
This Cable Locator is applicable for construction involving
telecommunication cables, power cables and building pipelines, as well as
maintenance of such cables and pipelines.
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1.2. Characteristics of This Cable Locator
ŸDetecting cables, electrical lines, water/gas supply pipelines in walls or
underground;
ŸDetecting interruptions and short circuit in cables and electrical lines in
walls or underground;
ŸDetecting fuses and assigning current circuits;
ŸTracing sockets and distribution sockets that have accidentally been
covered by plastering;
ŸDetecting interruptions and short-circuits under floor heating;
ŸThe transmitter is integrated with the function of AC/DC voltmeter, which
can measure 12 to 400V
AC/DC voltage on a linear basis:
AC ~ : 12 to 400V (50 to 60 Hz)± 2.5%
DC : 12 to 400V ± 2.5%
ŸThe screen of the transmitter can display preset transmitting power,
transmitted codes, its own battery energy, mains voltage detected, AC/DC
status of mains voltage detected, and warning symbol for mains voltage.
ŸThe transmitter has a self check function to detect its own working status
and to display it on the LCD screen for user's reference.
ŸThe screen of the receiver can display the transmitting power of the
transmitter, transmitted codes, energy of the transmitter's and its own
batteries, AC voltage induced signal detected and warning symbol for
mains voltage.
ŸThe sensitivity of the receiver can be adjusted either manually or
automatically.
ŸThe receiver can sweep frequency automatically.
ŸBoth the transmitter and the receiver can work under mute mode.
ŸThe receiver is available with auto power off (It is powered off
automatically over 10 minutes of if there are no buttons pressed).
ŸThe receiver's LCD screen is provided with backlight for application in
poor light.
ŸBoth the transmitter and the receiver is provided with flashlight function
when working in dark areas.
ŸAdditional transmitters are available to extend or distinguish several
signals.
ŸCompact, durable and portable.
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1.3. Names And Functions Of Parts
1.3.1. Sketch of transmitter
1 - LCD screen.
2 - Power on/off key.
3 - Key for setting/confirming transmitting
power level (Level I, II or lll)
4 - Key for transmitting or stopping to
transmit code information.
5 - Key for setting/confirming code
information to be transmitted. Press this
key for 1 second to enter code setting
and press it briefly to exit setting
(Code F, E, H, D, L, C, 0 or A can be
selected, with default as F).
6 - Down key. When setting power level or
code, press it to go down.
7 - Up key. When setting power level or code,
press it to go up.
8 - Key for enabling or disabling mute mode
(no keypad tone under mute mode).
9 - Key for turning on/off flashlight.
10 - "+" hole, input/output hole of the
transmitter. The transmitter is connected
to external cables with the test lead
through this hole to send out signals and
receive detected voltage signals.
11 - Earth Terminal. The transmitter is
grounded with the test lead through this
hole.
1.3.2. Transmitter display
1 - Symbol to indicate voltage/energy of the
transmitters battery.
2 - Transmitting power level (Level I, II or
111)
3 - Transmitting code (default as F).
4 - Mains AC voltage
5 - Mains DC voltage
6 - Mains voltage value (can be used as
an ordinary voltmeter;
range: 12 to 400v DC/AC)
7 - Transmitting status.
8 - Code being transmitted.
9 - Intensity of signal being transmitted.
10 - Symbol to indicate mains voltage.
11 - Symbol to indicate mute mode.
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1.3.3. Sketch of receiver
1 - Flashlight.
2 - Probe head
3 - LCD screen
4 - Power on-off key
5 - Composite key for
backlight and mute mode.
Press briefly to
enable/disable backlight
and press for 1 second to
enable/disable mute
mode (under mute mode,
both the keypad tone and
the speaker are silent).
6 - Key for turning on/off the
flashlight.
7 - UAC key for switchover
between cable locating
mode and mains voltage.
8 - MANUAL key for
switchover between
manual and automatic
cable locating.
9 - Key for adjusting
sensitivity down under
manual mode.
10 - Key for adjusting
sensitivity up under
manual mode.
11 - Loudspeaker.
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1.3.5. Display of receiver under cable locating mode
1.3.4. Receiver display
1 - Symbol to indicate voltage/energy of the receiver's battery.
2 - Symbol to indicate voltage/energy of the transmitter's battery.
3 - Transmitting power level received (Level I, II or 111)
4 - Symbol of manual mode.
5 - Symbol of automatic mode.
6 - Automatic mode, this number
indicates signal intensity; under
manual mode, this place
displays SEL to indicate no
signal or displays a number
indicating the signal intensity;
under UAC mode, this place
displays "UAC'.
7 - Concentric circles indicating the
preset sensitivity in graphics.
More circles indicate higher
sensitivity, while fewer circles
indicate lower sensitivity.
8 - Code received.
9 - Intensity of signals.
10 - Symbol to indicate mains voltage.
11 - Symbol to indicate mute mode.
1. Automatic mode 2. Manual mode
3. Mains voltage identification mode
3

2. Measuring Method
2.1. Measurement Precautions
1. As the connection of the transmitter with the mains supply
may generate circuit current of milliamperes, in a live
condition the earthing of the transmitter can be only
connected with a neutral conductor. If transmitter
connection is connected from the phase towards the
protective conductor, the functional safety of the protective
conductor must be tested first, in compliance with DIN
VDE 0100. The reason is that when connecting the
transmitter from phase towards earth, all parts being
connected to the earth may be live in the event of an error
(if the earth resistance does not comply with the
regulations).
2. When the transmitter is connected with live mains, if the
earth of the transmitter is connected with protective earth,
the current leakage (if any) in the power supply line may
increase the circuit current of the transmitter, leading to
tripping of the leakage circuit breaker, i.e. tripping of
FI/RCD.
1. When the transmitter as a voltage tester to test the mains
voltage,it may arc when the probes touch the mains voltage,
this is normal phenomenon.
2. lf any one of the "Start/Stop" button, the "Code Set" button
and the "Level Set" button is effective, the other two are
ineffective.
3. lf the receiver is under automatic mode, it can be switched
to manual mode or mains voltage identification mode at any
time; if the receiver is under manual mode, either UAC
button or MANUAL button will be effective only upon quitting
from the manual mode.
2.2. Functional principle
This Cable Locator consists of a transmitter, a receiver and accessories.
The transmitter sends an AC voltage modulated by digital signals,
which generates an alternating electric field to the target cable (or
metal pipes) (see Fig. 2-1 ); Put the probe of the receiver close to this
electric field, and the sensor will generate induced voltage. This
instrument can magnify this weak voltage signal by hundreds of limes
and then display it via a LCD screen after digital processing, so that
the position of the buried cables or pipes, as well as their faults, can
be detected based on the change of the signal. 15

16
Alternate connections of this Cable Locator
1. One-pole application: Connect the transmitter to only
one conductor. Due to the high-frequency signal
generated by the transmitter, only one single conductor
can be located and traced. The second conductor is the
earth. This arrangement causes a high frequency
current to flow through the conductor and to be
transmitted to the earth, similar to a radio or a receiver.
2. Double-pole application: The transmitter is connected
to the conductor by two test leads. This application
includes live mains and disconnected mains.
Ÿ The transmitter connected to live mains:
Connect the "+" terminal of the transmitter to the phase
line of mains and the Earth terminal of the transmitter to
the neutral line of the mains. Under this circumstance, if
there is no load in the mains, the modulated current
from the transmitter will go to the neutral line via
coupling through the distributed capacitance in the
mains and then return to the transmitter.
Ÿ The transmitter connected to disconnected mains:
Connect the "+" terminal of the transmitter to a terminal
of a line in the mains, connect the Earth terminal to the
terminal of another parallel line in the mains, and then
For any application, the connections of the transmitter
should ensure a closed circuit. £ll 2.This Cable Locator can
only detect or locate lines correctly connected in accordance
CAUTIONS to the physical principle described.

connect the other two terminals in the mains with each
other. Under such circumstance, the modulated current
will directly return to the transmitter through the mains.
Optionally, the two test leads of the transmitter can be
respectively connected to the two ends of the conductor.
Besides, the "+" terminal of the transmitter can be
connected to a terminal in the mains while the Grounding
hole of the transmitter can be connected to the protective
earth terminal of the mains.
2.3 Examples of Typical Application
In this example, please take a piece of a shielded cable with a cross
sectional area of 1.5mm². Provisionally install 5m of this cable along
the wall with nail clips at eye level as surface mounting. Make sure
that the wall is accessible from both sides. Create an artificial
interruption at a distance of 1.5m before the line terminal. The line
terminals must be open. Strip the interrupted lead at the beginning of
the light shielded cable and connect it via the test leads (provided)
with terminal 10 of the transmitter. Connect terminal 11 of the
transmitter to a suitable earth. All other cable leads must also be
connected to the transmitter and the same earth(See Fig. 2-2).
Switch on the transmitter via button 2 , when the LCD screen of the
transmitter displays the initial screen the buzzer will buzz. Press
button 3 of the transmitter to enter the screen for setting transmitting
level and then press up button 7 or down button 6 to select
transmitting power level (Level I, II or Ill). After this level is set, press
button 3 to exit. If you want to change the transmitting code, press
button 5 of the transmitter for about 1 second and then press up
button 7 or down button 6 to select transmitting code (F, E, H, D, L,
C, 0 or A, with default F). Press button 5 to exit. Then, press button 4
to send information. At this moment, the concentric circles 7 on the
LCD display will be gradually spread, and symbol 8 will display the
transmitting code received by the transmitter itself, and symbol 9 will
display the signal intensity. Press key 4 of the receiver to power on
the receiver, when the LCD screen of the receiver displays the initial
screen, the buzzer will buzz, and the receiver will enter the default
"Automatic Mode'. Move the probe of the receiver slowly along the
cable to the interruption position, the symbol 3 of the receiver will
display transmitting power level, 8 will display the code transmitted by
the transmitter, 9 will display the dynamic signal intensity, and the
speaker will change tone with the change in signal intensity. 17

When the probe of the receiver passes the interruption position, the
signal intensity as displayed by 9 and 6 will have an obvious drop till
it completely disappears. At this moment, press MANUAL button 8 of
the receiver to switch it to manual mode and then use button 9 and
10 to reduce the sensitivity as much as possible while ensuring
that 8 the receiver's screen can display the code transmitted by the
transmitter. Then, this area is where the interruption is located.
3. DETAILS OF APPLICATION
3.1. One-Pole Application
3.1.1. In Open Circuit
Ÿ Detecting line interruptions in wall or floor;
Ÿ Finding and tracing lines, sockets, junction boxes, switches, etc.
for house installations;
Ÿ Finding bottlenecks, kinking and buckling and obstructions in
installation pipes by means of a metal wire.
When using this application, please ensure the you have a
proper or good earth.
1. Application in open circuit is suitable for finding sockets
and switches in disconnected equipment.
2. The tracing depth is depending on the medium and
application. A typical tracing depth is D to 2m. The
protective terminal of an electrical outlet can be used as
the earth connection of the transmitter.
1. Proper or good earth should
be ensured.
2. Adjust the transmitting power
level of the transmitter to adapt
it to different detection radiuses.
The best practice for testing is
to mark the interruption position
on the other side of the wall.
PressMANUAL key of the
receiver to switch it to manual
mode. Press button 9 and 10 to
reduce the sensitivity to make
sure that the signal is just
receivable. Trace the signal in
front of the wall with the
receiver till it is no longer
indicated
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3.1.2. Locating and tracing of lines and sockets
Preconditions:
Ÿ The circuit must be dead or disconnected.
Ÿ Neutral line and protective earth wire must be connected and
fully operational.
Ÿ Connect transmitter to phase line and protective earth wire
according to Fig. 3-1-2.
1. Proper or good earth should be ensured.
2. With the one-pole indication, also parallel circuit branches
can be traced (The breaker must be removed in this
example).
3. lf the supply cable fed with the signals via the transmitter
is located, e.g. directly in parallel to other conductors
(e.g. cable groove o duct), or these conductors are
crossed, the signals are also input into the other
conductors.
4. During locating and tracing, the stronger the signal
displayed, the closer the locator is to the lines to be
traced.
5. Adjust the transmitting power level of the transmitter to
adapt it to different detection radiuses.
6. The target position can be precisely located by your
setting of the manual mode of the receiver and selecting
of proper sensitivity. 19

3.1.3. Locating of line interruptions
Preconditions:
Ÿ The circuit must be dead or disconnected.
Ÿ All lines which are not required must be connected to the
auxiliary earth in accordance with Fig. 3-1-3.
Ÿ Connect the transmitter to one lead and to an auxiliary earth
according to Fig. 3-1-3.
1. Proper or good earth should be ensured.
2. The transition resistance of a line interruption must be
higher than 100kOhm.
3. When tracing line interruptions in multi-core cables, note
that all remaining leads in the shielded cable or conductor
must be earthed in accordance with the regulations. This
is required to avoid cross-coupling of the fed signals (by a
capacitive effect to the source terminals). The tracing
depth for shielded cables and conductors are different, as
the individual leads in the shielded cables are twisted
around themselves.
1. The earth connected to the transmitter can be an
auxiliary earth, earth from an earthed socket or a water
pipe which is properly earthed.
2. During tracing along the line, the position at which the
signal received by the receiver has an abrupt decline is
the position of the interruption.
3. Adjust the transmitting power level of the transmitter to
adapt it to different detection radiuses.
4. The target position can be precisely located by your
setting of the manual mode of the receiver and selecting
of the proper sensitivity.
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