Mastech MS6818 User manual

Operating instructions for Cable Detector, article 37270766
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Operating Instructions: Cable Detector
In order to be able to use the cable detector to the full, read the operating instructions attentively and
completely before taking the device into operation, and store this document where it is easily accessible

Operating instructions for Cable Detector, article 37270766
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Table of Contents
1. SCOPE OF DELIVERY 4
2. SAFETY INSTRUCTIONS 5
3. OVERVIEW 8
3.1 PRODUCT INTRODUCTION 8
3.2 CHARACTERISTICS OF THE CABLE DETECTOR 9
3.3 DESCRIPTION AND FUNCTION 10
3.3.1 TRANSMITTER ILLUSTRATION 10
3.3.2 TRANSMITTER DISPLAY 10
3.3.3 RECEIVER ILLUSTRATION 11
3.3.4 RECEIVER DISPLAY 11
3.3.5 RECEIVER DISPLAY IN SEARCH MODE 11
4. MEASURING PROCEDURE 12
4.1 SAFETY PROCEDURES DURING MEASURING 12
4.2 FUNCTIONAL PRINCIPLE 12
4.3 EXAMPLES OF TYPICAL APPLICATIONS 14
5. FIRST USE 14
5.1 SINGLE-POLE USE 14
5.1.1 IN OPEN CIRCUITS 14
16
5.1.3 DETECTING CABLE BREAKS 16
5.1.4 DETECTING LINE BREAKS WITH TWO TRANSMITTERS 17
5.1.5 FAULT DETECTION IN DEFECTIVE ELECTRIC UNDERFLOOR HEATING 18
5.1.6 LOCATING BLOCKAGES IN NON-CONDUCTIVE LINES 19
5.1.7 LOCATING METAL WATER AND HEATING PIPES 20
5.1.8 FINDING A CIRCUIT IN A STOREY 21
5.1.9 TRACKING LINES UNDER PLASTER 22
5.2 TWO-POLE USE 23
5.2.1 USE IN CLOSED CIRCUITS 23
5.2.2 DETECTING FUSES 24
5.2.3 LOCATING THE CAUSE OF A SHORT-CIRCUIT 25
5.2.4 LOCATING DEEPLY COVERED POWER CABLES 26
5.2.5 CLASSIFYING OR IDENTIFYING A COVERED CIRCUIT 27
5.3 METHOD TO INCREASE THE EFFECTIVE RADIUS WHEN DETECTING LIVE CIRCUITS 28
5.4 IDENTIFYING GRID VOLTAGE AND SEARCHING FOR BREAKS IN CIRCUITS 29
6. OTHER FUNCTIONS 30
6.1 VOLTMETER FUNCTION OF THE TRANSMITTER 30
6.2 FLASHLIGHT FUNCTION 30
6.3 BACKGROUND LIGHTING 30

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6.4 SILENT FUNCTION 30
6.5 AUTOMATIC SWITCH-OFF 30
7. TECHNICAL PARAMETERS 31
7.1 TECHNICAL PARAMETERS OF THE TRANSMITTER 31
7.2 TECHNICAL PARAMETERS OF THE RECEIVER 31
8. REPAIR AND MAINTENANCE 31
8.1 TROUBLESHOOTING 31
8.2 CHECK THE TRANSMITTER FUSE. 32
8.3 CLEANING 33
8.4 CHANGING THE BATTERY 33
8.5 CALIBRATION 33
9. ADDRESSES 34
10. LEGAL NOTICE 34

Operating instructions for Cable Detector, article 37270766
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1. Scope of delivery
Examine the cable detector carefully after opening the package and make sure that it was not damaged during
shipping. Thoroughly check the accessories, control switch and connections. If there is obvious damage or a
malfunction, contact the supplier immediately.

Operating instructions for Cable Detector, article 37270766
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2. Safety instructions
This cable detector has been manufactured in accordance with the applicable safety
requirements for electronic test and measurement instruments, and was completely checked
prior to packaging and shipping. Please read these operating instructions carefully before taking
the device into operation, and follow all instructions. Failure to follow the instructions or to
comply with the
warnings and safety instructions in this manual can lead to
damage to the equipment, severe injury, or death.
Definition of safety instructions
Table 1: Safety symbols
Important information that the user must read before first use of the equipment.
Shows that this connection can be hazardous.
Conformity mark
Table 2: Warnings
Improper use can lead to severe injury or death.
Improper use or negligence can lead to injury, damage to the
equipment, or false measurement results.
Notes and tips for use.

Operating instructions for Cable Detector, article 37270766
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Important!
Please follow these instructions in order to ensure safe operation and good performance.
1.) Pre-check
Before use, check to see that the cable detector functions properly and make sure that it was not damaged
during storage and transport. If there is damage, do not take the unit into use. Contact the vendor.
When using the cable detector always make sure to follow the
applicable electronic industry safety regulations.
2.) Storage
Operating temperature
0-40°C (32-104°F, <80%RH (no condensation)
Storage temperature
-20 - +60°C (-6 –140°F), <80%RH (no condensation)
To prevent defects and faults, never store the cable detector in the following environments:
3.) Operation
Follow these instructions to prevent shock, short-circuits and explosions:
1. This cable detector can be used directly with parts conducting current. However, take insulation
measures in accordance with industry safety regulations in order to prevent shocks and injury.
2. To prevent shocks the applicable safety and VDE rules relating to excess contact voltages must be followed
carefully when working with voltages over 120 V (60 V) DC of 50 V (25 V) effective AC. The amounts in
brackets apply for specific areas (such as medicine and agriculture).
3. Never try to make contact between the two battery terminals, for example with a cable connection. Never
throw the battery into a fire, as it may explode.
4. When replacing or changing the battery, make sure of correct polarity. Incorrect battery polarity can
destroy the device. There is also a risk of explosion and/or fire.

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1. Measurements in dangerous proximity to electrical systems may be made only under the direction of
a responsible electrician.
2. If the device is used to test a live wire, make sure that the test lead is removed from the component
under test before connecting or disconnecting the test lead of the transmitter, and tell people in the
vicinity to protect themselves well.
3. Never attempt to disassemble the batteries! The batteries contain very strongly alkaline chemicals.
They can cause chemical burns. If the contents of the battery come into contact with skin or clothing,
rinse immediately with water and remove contaminated clothing. If the contents of the battery come
into contact with the eyes, rinse immediately with water and get medical help.
4. Connecting the transmitter to the grid can generate a current in the milliampere range in the circuit in
live condition, so the transmitter can be grounded only on a neutral conductor. If the transmitter
connection is from the phase to the protective conductor, the functional safety of the protective
conductor must first be tested per DIN VDE 0100, because all components connected to ground when
the transmitter is connected from phase to ground can become live in the event of a fault (if the
grounding resistance is not in accordance with requirements).
5. If operator safety is no longer assured, the test device must be taken out of operation and secured
against further use. Safety is no longer assured if the device:
Has obvious damage;
Does not perform the desired measurements;
Was stored too long under unfavourable conditions;
Was mechanically stressed during transportation.
6. The test device may be used only for the intended purpose under the intended conditions. Operating
safety is no longer assured if the device is modified or altered.
1. The operating temperature of the cable detector is between 0 - 40 °C (32 -104 °F).
2. To avoid damage, the device should be protected from excessive mechanical vibration during use, and
especially against falling.
3. Only persons with the proper knowledge may calibrate and repair this instrument.
4. Before use, check the instrument and the test leads used for external damage. Make sure that the test
device and test leads are intact. The instrument may be used only after all of its functions have been
thoroughly prepared for the use.
5. When the device is in use, the rated voltage of the conductor under test may not be greater than the
rated voltages given in the technical specifications of this cable detector.
6. Protect the device from direct sunlight, to ensure proper functioning and long operating life.
7. If the test device is exposed to an extremely strong electromagnetic field, its functioning may be
impaired.
8. Use only the batteries named in the Technical Specifications section.
9. Protect the batteries from moisture. If a blinking battery symbol appears on the display, the batteries
need to be replaced.
1. If the cable detector has been stored or transported under extreme climate conditions, leave it in a
permissible (rated) environment for a while before using.
2. If the transmitter is connected to a live grid and the ground connection of the transmitter is connected
to a ground protective phase, the fault current (if present) in the power supply line can combine with
the current in the transmitter circuit to trip the fault-current circuit breaker i.e. trigger FI/RCD.
3. Please keep the original packaging for later shipping (for example, for calibration).

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3. Overview
3.1 Product introduction
When you cut a hole in a wall to install air conditioning, dig a hole in the ground to install a machine, or dig up a
road, you first have to check the location of cables, water pipes and gas lines, to avoid them and prevent
unnecessary problems and hazards. Up until now there was only one way to do this - examining the technical
drawings of the installations concerned. But often these drawings are impossible to find, so you have to hope for
the best and work blind. This can cut cables and pipelines, and lead to power outages, shocks, explosions and even
loss of life.
The cable detector 37270766 sold by our company helps users find cables and lines. You no longer have to just rely
on luck. This cable detector is portable and consists of a transmitter, receiver and some accessory components.
With its modern integrated components and digital circuitry, it is very stable and reliable. The transmitter sends to
the cable (or metal pipe) being searched for an alternating voltage modulated by digital signals. This voltage
generates an alternating field. If you hold the sensor head of the receiver near the field, the sensor generates an
induced voltage. The device amplifies the weak voltage signal several hundred times, and then based on the signal
changes, and after decoding the audio frequency, demodulation and digital processing, shows the position of
hidden cables and pipes as well as their defects on an LCD screen.
The cable detector is user friendly and features pushbutton operation with confirmation by a buzzer. It also has a
visual display, transmitter and receiver with LED lights. The transmitter doesn’t just transfer signals, but also acts as
an AC/DC voltage meter, so that the instrument can show the tested conductor, including AC/DC status and a
warning if a live conductor is tested. The transmitter also has a self-test function that shows on the display if the
transmitter is sending signals, giving the user more certainty when testing. The receiver display is backlit so that
users can see the test results in the dark as well. To improve testing efficiency, the receiver has a loudspeaker that
sounds different tones for different signal intensity levels, so that the user can assess the test results audially for
added convenience. The loudspeaker adapts to loud environments with increased volume. Naturally there is also a
soundless mode for transmitter and receiver to avoid disturbing others. This cable detector is intended for
construction work involving telephone, power and building lines, as well as for maintenance work on these cables
and pipelines.

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3.2 Characteristics of the cable detector
Detects cables, electric, water and gas supply lines in walls and in the ground.
Detects breaks and short-circuits in electric lines in walls and in the ground.
Locates fuses and maps them to circuits.
Locates plug sockets and junction boxes inadvertently plastered over.
Detects breaks and short-circuits in underfloor heating.
The transmitter has an integral AC/DC voltmeter function that can linearly measure direct and alternating
voltage from 12 to 400 V.
AC~: 12 to 400V (50 to 60 Hz) to 2.5%
DC=: 12 to 400V to 2.5%
The transmitter display can show the preset transmitter power, the codes sent, the energy remaining in the
unit’s battery, the grid voltage found, the AC/DC status of that voltage and a warning signal that grid voltage is
present.
The transmitter has a self-test function that detects its status and shows it to the user on the LCD display.
The receiver display can show the transmitter power, the codes sent, the energy remaining in its battery and
that of the transmitter, the AC signal found and a warning signal for grid voltage.
The receiver sensitivity can be set manually or automatically.
The receiver can determine the frequency automatically.
Both the transmitter and the receiver can be operated in silent mode.
The receiver is available with automatic switch-off (switches off automatically if no button is pressed for over
10 minutes).
The receiver LCD display is backlit for use in low light.
Both the transmitter and the receiver have a flashlight function for use in low light.
Additional transmitters are available to extend the system or differentiate multiple signals.
The cable detector is compact, robust and portable.

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3.3 Description and function
3.3.1 Transmitter illustration
3.3.2 Transmitter display

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3.3.3 Receiver illustration
3.3.4 Receiver display
3.3.5 Receiver display in search mode
(1) Automatic mode (2) Manual mode (3) Grid voltage detection

Operating instructions for Cable Detector, article 37270766
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4. Measuring procedure
4.1 Safety procedures during measuring
1. Connecting the transmitter to the grid supply can generate a current of a few milliamperes in the
circuit in live condition; accordingly, the transmitter can be grounded only on a neutral conductor. If
the transmitter connection is from the phase to the protective conductor, the functional safety of the
protective conductor must first be tested per DIN VDE 0100. Because all components connected to
ground are then connected to ground by the transmitter with the phase, meaning that they can
become live in the event of a fault (if the grounding resistance is not in accordance with
requirements).
2. If the transmitter is connected to a live grid and the ground connection of the transmitter is connected
to a ground phase, the fault current (if present) in the power supply line can combine with the current
in the transmitter circuit to trip the fault-current circuit breaker i.e. trigger FI/RCD.
1. When using the transmitter as a voltmeter to test grid voltage, there is often a small spark when the
measurement sensor touches grid voltage. This is a normal reaction.
2. If the Start/Stop, Code Set or Level Set key is active, the other two are inactive.
3. If the receiver is operating in automatic mode, it can be switched to manual mode or grid voltage
ident mode at any time; if the receiver is set to manual mode, the UAC or MANUAL key is reactivated
only after leaving manual mode.
4.2 Functional principle
This cable detector is portable and consists of a transmitter, receiver and some accessory components. To locate a
cable (or metal pipe) the transmitter sends an alternating voltage modulated by digital signals. This voltage
generates an alternating field (see Fig. 2-1). If you hold the sensor of the receiver near the field, the sensor
generates an induced voltage. This device amplifies this weak voltage signal several hundred times, and then based
on the signal changes, and after decoding the audio frequency, demodulation and digital processing, shows the
position of hidden cables and pipes as well as their defects on an LCD screen.
1. For all applications the transmitter connections must form a closed circuit.
2. This cable detector can only detect and locate lines that are connected correctly per the described
physical principles.

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Optional connection types
1. Single-pole use: Connect the transmitter with just one lead. The high frequency signal generated by
the transmitter can detect and track only one conductor. The second conductor is ground. This
configuration generates a high frequency current that flows through the conductor and on to
ground, similar to a radio or receiver.
2. Double-pole use: The transmitter is connected to the conductor by two test leads. This configuration
can detect live and voltage-free lines.
The transmitter is connected to live wires:
Connect the + terminal of the transmitter to the grid conductor phase and the ground terminal of the
transmitter to the grid neutral conductor. If the grid wire is not live, the modulated current from the
transmitter will pass through the distributed capacity in the grid line to the neutral wire and return to
the transmitter.
The transmitter is connected to voltage-free wires:
Connect the + terminal of the transmitter to a grid neutral connection. Connect the ground terminal to
another parallel grid wire and connect the two other grid connections to each other. In this case the
modulated current returns directly to the transmitter through the grid wire. Optionally, the two
transmitter test leads can be connected to the two ends of the conductor. The + terminal of the
transmitter can be connected to the grid line, and the ground terminal of the transmitter to the grid’s
protective ground lead.

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4.3 Examples of typical applications
For this example you will need a length of shielded cable with a 1.5 mm2cross section. Install 5 m of the cable
temporarily on a wall at eye level using nail clamps. The wall should be accessible from both sides. Make a
break in the line 1.5 m away from the transmitter connection. The wire connections must be open and
accessible. Cover up the interrupted wire strands at the break and connect the cable to the transmitter
terminal (10) using the supplied test leads. Connect the terminal 11 of the transmitter to a suitable ground
connection. All other strands in the cable should also be connected to the transmitter and the same ground.
(see Fig. 2-2).
Turn on the transmitter by pressing the key (2). When the transmitter LCD display shows the starting image the
buzzer will sound. Press key (3) on the transmitter to get to the display for setting transmission power, then
press “up” (7) or “down” (6) to select the power (level I, II or III). Once the power is set, press key (3) to exit the
display. To change the transmission code, press transmitter key (5) and hold it down for about a second, then
press “up” (7) or “down” (6) to select the transmission code (F, E, H. D. L. C. O or A, default F). Press key (5) to
exit. Then press key (4) to send the information. The LCD display will show concentric circles (7) gradually
spreading out. Symbol (8) shows the transmission code received from the transmitter, and (9) shows the signal
strength. Press receiver key (4) to switch it on. When the receiver LCD display shows the starting image the
buzzer will sound, and the receiver will go to automatic mode by default. Slowly move the receiver probe along
the cable until you reach the break. When the symbol (3) of the receiver shows the transmission power, (8) will
show the code sent by the transmitter and (9) the dynamic signal strength. The loudspeaker will change its
pitch to reflect the signal intensity change. When the receiver probe passes the break, the signal intensity
shown in (9) and (6) will show a sudden decline and disappear entirely. When this happens, press the
“MANUAL” key (8) on the receiver to switch to manual mode, then use keys (9) and (10) to reduce the
sensitivity as far as possible while making sure that (8) the code sent by the transmitter is visible on the
receiver display. This the area where the line break was detected.
5. First
use
5.1 Single-
pole use
5.1.1 In open
circuits
Detecting cable breaks in walls and floors;
Locating and tracking cables, sockets and plugs, switches etc. in home installations
Finding bottlenecks, kinks, bends and clogs in installed pipes with the help of a metal wire
For these applications make sure the ground conductor is functional.
1. There must be complete grounding.
2. Adjust the transmitter power
to fit the respective search radius. It is a good idea to mark the break on the other side of the wall. Press
the “MANUAL” key on the receiver to switch to manual mode. Press keys (9) and (10) to reduce the
sensitivity as far as possible so that the signal can barely be received. Follow the signal on the front of the
wall with the receiver until it is no longer displayed. The position of the break can be determined more
precisely with this kind of setting.

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1. Use in open circuits is suitable for locating sockets and switches that are not bearing current.
2. The tracking depth depends on the material and the conditions of use. The ideal tracking depth is 0 to
2 m. The protective conductor of a plug socket can be used to ground the transmitter.

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5.1.2 Locating and tracking wires and sockets
Requirements:
The circuit must not be live.
The neutral and protective leads must be
connected and fully functional.
Connect the transmitter to the phase and
protective ground per Fig. 3-1-2.
5.1.3 Detecting cable breaks
Requirements:
The circuit must not be live.
All leads not needed must be connected to auxiliary
ground per Fig. 3-1-3.
Connect the transmitter with a line connection and
auxiliary ground per Fig. 3-1-3.
1. The grounding connected to the transmitter can be an auxiliary ground, such as a grounded socket or
a properly grounded water pipe.
2. During tracking, at the break location there will be an abrupt decline in the signal shown at the
receiver.
3. Adjust the transmitter power to suit the different search radii.
4. The position you are searching for can be detected precisely by putting the receiver in manual mode
and setting the right sensitivity.
1. Make sure there is a complete ground connection.
2. With single-pole display it is also possible to track lateral
circuit junctions.
3. If the supply line getting signals from the transmitter is
directly parallel to other wires (e.g. cable slots of
channels) or if the wires cross, the signals will also be sent
to the other wires.
4. During search and tracking the signal will be shown
stronger as the receiver gets closer to the tracked leads.
5. Adjust the transmitter power to suit the different search
radii.
6. The position you are searching for can be detected
precisely by putting the receiver in manual mode and
setting the right sensitivity.
1. Make sure of complete grounding.
2. The transition resistance of a line break must be higher than 100 kOhm.
3. When finding breaks in multi-strand conductors, make sure that all the other wires in the shielded
cable or lead are properly grounded. This is necessary to avoid cross-coupling of the signals fed in
(through capacitive effect on the output connections). The tracking depth for shielded cables differs,
since the individual strands in the cable are twisted around each other.

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5.1.4 Detecting line breaks with two transmitters
When locating a line break with one transmitter supplied from one lead end, breaks cannot be precisely located
due to field interference in unfavourable conditions. These limitations can be ameliorated by connecting two
transmitters, one at each end. In this case each transmitter is set to a different lead code, e.g. Transmitter 1 to
Code F and Transmitter 2 to Code C. (A second transmitter with a different lead code is not included in the scope of
delivery, and must be ordered separately.)
Requirements:
The circuit must not be live.
All unused leads must be connected to ground as shown in Fig. 3-1-4.
Connect and use both transmitters per Fig. 3-1-4.
Proceed as in the example application.
If the transmitters are connected per Fig. 3-1-4, receiver C will show the line break on the left. If the receiver is
moved to the right over the break, it will show F. If you are directly on the break, due to the overlapping of both
transmitter signals no line code will be shown.
1. Adjust the transmitter power to suit the different
search radii.
2. The position you are searching for can be detected
precisely by switching the receiver to manual mode
and setting the right sensitivity.

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1. Make sure of complete grounding.
2. The transition resistance of a line break must be higher than 100 kOhm.
3. The grounding connected to the transmitter can the ground of a socket or a properly grounded water
pipe.
4. When finding breaks in multi-strand cables, make sure that all the other wires in the shielded cable or
lead are properly grounded. This is necessary to avoid cross-coupling of the signals fed in (through
capacitive effect on the output connections). The tracking depth for shielded cables and leads differs,
since the individual wires in the shielded cable are twisted around each other.
5.1.5 Fault detection in defective electric underfloor heating
Requirements:
The circuit must not be live.
All unused leads must be connected to auxiliary ground as shown in Fig. 3.1.5a.
Connect both transmitters (if two will be used) as shown in Fig. 3-1-5b.
Proceed as in the example application.
1. If a shielding mat is laid on heating wires, there must
be no ground connection. If necessary remove the
shielding from the ground connection.
2. Ensure that there is complete grounding and enough
distance between the ground connection of the
transmitter and the line being searched for. If the
distance is too small, the signal and the line cannot
be precisely located.

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5.1.6
Locating
blockages
in non-
conductive
lines
Requirements:
The pipeline must be of non-conductive material (such as plastic).
The pipeline must not be electrically charged.
The transmitter must be connected to a metallic pipe coil (metallic pipe or flexible protective pipe) and an
auxiliary ground as shown in Fig. 3-1-6.
Use the measurement procedure as shown in the example.
1. If the pipeline is carrying electrical current, the current must be switched off and the pipeline must be
grounded.
2. Connect the grounding wire in accordance with applicable regulations. The transmitter should have enough
distance to the pipeline being measured. If the distance is too small, the signal and the modelled circuit
cannot be precisely located.
1. During tracking, at the break location there will be an
abrupt decline in the signal shown at the receiver.
2. Adjust the transmitter power to suit the different
search radii.
3. The position you are searching for can be detected
precisely by switching the receiver to manual mode
and setting the right sensitivity.
4. A second transmitter is not absolutely necessary for
this application. For using just one transmitter, see
Fig. 3-5-1a.
1. If you find only a pipeline made of non-conductive
material (like glass fibre), we recommend inserting a
metal wire with about 1.5 mm² cross-section into the
non-conductive pipe and to the narrow or blocked
section.
2. The stronger the signal shown on the receiver, the
closer the receiver is to the pipeline under test.
3. When the signals to the receiver suddenly get
weaker during testing along the pipeline, the
problem area has been found.
4. Adjust the transmitter power to suit the different
search radii. Set the receiver to manual mode and set
the right sensitivity to precisely locate the problem
area.

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5.1.7 Locating metal water and heating pipes
Requirements:
The pipe must be of metal (e.g. galvanized steel pipe).
The pipeline must not be grounded. There should be relatively high resistance between pipe and floor
(otherwise the search range will be very small).
Use a wire to connect the grounding plug on the transmitter to ground.
Use a wire to connect the “+” plug on the transmitter with the pipeline under test.
Locating water and heating pipes is shown in Fig. 3-1-7a and Fig. 3-1-7b
For reasons of safety the power supply to electrical
components must be switched off.
1. The end of the transmitter ground conductor should be at a certain distance from the pipeline under test.
If the distance is too small, the signal and the circuit cannot be precisely located.
2. Adjust the transmitter power to suit the different search radii.
3. The stronger the signals shown on the receiver display, the closer the pipeline is.
4. Set the receiver to manual mode and set the right sensitivity to precisely locate the pipeline.
5. To find a pipeline made of non-conductive material, we recommend inserting a metallic wire into the
pipeline as described in 5.1.6.