Major tech MT915 Manuel utilisateur
INSTRUCTION MANUAL
2-IN-1 CABLE IDENTIFIER &
DIGITAL MULTIMETER
MT915
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Contents Page no
1. Applications General..........................................................................4
2. Front Panel Description......................................................................4
2.1. Transmitter Description.............................................................4
2.2. Receiver Description..................................................................4
2.3. Digital Multimeter Description.....................................................4
3. Specifications & Technical Data...........................................................5
3.1. DMM........................................................................................5
3.2. Transmitter...............................................................................6
3.3. Receiver...................................................................................6
4. Measuring Procedure.........................................................................6
4.1. Transmitter & Receiver Operation................................................6
4.2. Beep Alarm Test........................................................................7
4.3. Voltage Check...........................................................................7
4.4. Digital Multimeter Test...............................................................7
4.5. AC/DC Current Measurements....................................................7
4.6. Resistance Measurements..........................................................7
4.7. Continuity Check.......................................................................8
4.8. Diode Test................................................................................8
4.9. Max Hold Button.......................................................................8
4.10. Hold Button..............................................................................8
4.11. Auto Power Off..........................................................................8
4.12. Replacing the Fuses...................................................................9
4.13. Battery Replacement.................................................................9
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1. APPLICATIONS GENERAL
The MT915 is a transmitter/receiver device which enables one person to
instantly match up ends of individual cores at either end of a multi-core
cable. With the remote kit it can tester cables installed far away either on
wall plate or patch panel. Digital multimeter function make it easy to
measure DC/AC voltage, DC/AC current , Resistance, Continuity & Diode.
2.FRONT PANEL DESCRIPTION
2.1. Transmitter Description
1 - OFF/ON switch (Transmitter) 4.3
Voltage check
2 - Low battery indicator
(Transmitter)
3 - Operation indicator (Transmitter)
4 - Cable plug (Transmitter)
5 - Alligator clips with cables of
transmitter (CHl to CH16&
reference cable)
6 - Battery cover & compartment
(Transmitter)
2.2. Receiver Description
7 - Alligator clips of receiver (CH1
& reference cable)
8 - LED diplay (blue 2bit)
(Receiver)
9 - Low battery indicator
(Receiver)
10 - Operation indicator (Receiver)
11 - Tester switch for receiver test
or test cable of put through
and cable disconnetion &
identify
12 - Voltage check switch for on
cable voltage check
13 - OFF/ON switch (Receiver)
2.3 Digital
Multimeter
Description
14 - Function switch
15 - 3 1/2 digit (2000
count) LCD
display for DMM
functions
16 - Max hold button
17 - Mode button
18 - Data hold button
19 - COM input jack
20 - V, uA, mA, Q
input jack
21 - Battery cover
&compartmen
(Receiver&DMM)
OP
ON
CABLE TESTER
CABLE IDENTIFIER
CABLE TESTER
CABLE IDENTIFIER
Vcheck
1
2
3
4
5
6
8
12
14
15
17
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9
10
11
13
16
18
DC Voltage 200mV, ±(0.5% rdg + 3d)
2.000V, 20.00V, ±(1.0% rdg + 3d)
200.0V, 600V ±(1.0% rdg + 3d)
AC Voltage 2.000V, 20.00V ±(1.0% rdg + 5d)
50-60Hz 200.0V, 600V ±(1.5% rdg + 10d)
DC Current 200.0μA, 2000μA ±(1.5% rdg + 3d)
20.00mA, 200.0mA ±(2.0% rdg + 3d)
AC Current 200.0μA, 2000μA ±(1.8% rdg + 8d)
20.00mA, 200.0mA ±(2.5% rdg + 8d)
Resistance 200.0Ω ±(0.8% rdg + 5d)
2.000kΩ, 20.00kΩ ±(1.2% rdg + 3d)
200.0kΩ
2.000MΩ ±(2.0% rdg + 5d)
20.00MΩ ±(5.0% rdg + 8d)
Function Range
3. SPECIFICATIONS & TECHNICAL DATA
3.1. DMM
Accuracy
Max input voltage 600V AC/DC
Diode Test Test current 1mA max., open circuit voltage of
1.5V typical
Continuity Check Audible signal if the resistance is <150Ω
Display 2000 count 3 -1/2 digit LCD
Over range indication LCD displays “OL”
Polarity Minus (-) sign for negative polarity.
Low Battery Indication “BAT” symbol indicates low battery condition.
Input Impedance >7.5MΩ (VDC & VAC)
AC Response Average responding
ACV Bandwidth 50Hz to 60Hz
Auto Power Off 15 minutes (approximately)
Fuse mA, μA ranges; 0.2A/250V fast acting Fuse
Batteries 9V battery and two “AAA” batteries
Operating Temperature 0°C to 40°C (32°F to 104°F)
Storage Temperature -10°C to 50°C (14°F to 122°F)
Weight 308g
Size 162 x 74.5 x 44.0mm
Standard IEC61010-1 CAT III-600V Pollution degree II,
CE Approved
Function Range
5
6
3.2. TRANSMITTER
Display Two red LED lamps
Aligators 17 Croc clips-red*16,black*1
Cable resistance 30K Ohm max
Power 9V battery
Power current 1.8mA
Operating temperature 0°C to 40°C (32°F to 104°F)
Storage temperature –10°C to 50°C (14°F to 122°F)
Function Range
3.2. RECEIVER
Display Two digit blue LED display
Aligators 2 Croc clips-red*1,black*1
Power 9V battery
Power current 23mA
Operating temperature 0°C to 40°C (32°F to 104°F)
Storage temperature –10°C to 50°C (14°F to 122°F)
Continuity test Beep if less than 100Ω
Cable voltage check 5V to 16V DC
Function Range
4. MEASURING PROCEDURE
4.1. Transmitter & Receiver Operation
1. At one end of the cable, connect one of the transmitter terminals
marked “CH1 to CH16” to each core of the cable under tester. Connect
the “COM”reference lead (black alligator) of the transmitter to a core
which is the only known one.
2. At the other end of the cable, connect the “COM terminal”(black
alligator) of the receiver. When the “input terminal” (red alligator) of
the receiver is successively touched on the cores of the cable under
test, the relevant number of the way is indicated on the display of the
receiver (1-16).
Operation example 1: Cable trace test
Operation example 2: Metal water pipe trace test
CAUTION: Though the units already build in the protection
circuit, do not apply voltage that is over 50V (AC or DCV) to
any alligator clips of the transmitter & receiver. Otherwise
the instruments may be permanently damaged.
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4.2. Beep alarm test
1. Press the “TEST” button in on the Cable Identifier.
2. Connect the 2 Croc Clips to both sides of a cable to check the
continuity. If the cable is fine a beep sound will be heard.
4.3. Voltage Check
1. Press the “V check” button to down use receiver of 2 Croc clips.
2. Connect the Black alligator to the “COM” reference and connect the Red
alligator to the cable port, if two digit blue LED display is “ UU ” this
proves the cable has voltage. Only check is mainly voltage.
4.4. Digital Multimeter Test
4.4.1. AC/DC Voltage Measurements
1. Insert the black test lead into the negative COM terminal and
the red test lead into the positive V terminal.
2. Set the function switch to VAC or VDC position.
3. Connect the test leads in parallel to the circuit under test.
4. Read the voltage measurement on the LCD display.
4.5. AC/DC Current Measurements
1. Set the function switch to the μA/mA position.
2. Insert the black test lead into the negative COM terminal and the red
test lead into the positive μA/mA terminal.
3. For current measurements up to 2000μA DC/AC, set the function switch
to the mA position
4. Press the MODE button to indicate “DC” / “AC” on thedisplay.
5. Remove power from the circuit under test, then open up the circuit at
the point where you wish to measure current.
6.Touch the black test probe tip to the negative side of the circuit. Touch
the red test probe tip to the positive side of the circuit.
7. Apply power to the circuit.
8. Read the current in the display
4.6. Resistance Measurement
1. Set the function switch to the Ω position.
2. Insert the black test lead into the negative COM terminal and the red
test lead into the positive Ω terminal.
CAUTION: Beep if less than 100Ω.
CAUTION: Check voltage range at 5V to 16V DC.
CAUTION: Do not measure AC/ DC voltages if a motor on the
circuit is being switched ON or OFF. Large voltage surges may
occur that can damage the meter.
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3. Touch the test probe tips across the circuit or part under test. It is best
to disconnect one side of the part under test so the rest of the circuit
will not interfere with the resistance reading.
4. Read the resistance in the display
4.7. Continuity Check
1. Set the function switch to the position.
2. Insert the black test lead into the negative COM terminal and the red
test lead into the positive Ω terminal.
3. Press the MODE button to indicate on the display
4. Touch the test probe tips to the circuit or wire you wish to check.
5. If the resistance is less than approximately 150Ω, the audible signal will
sound. If the circuit is open, the display will indicate “OL”.
4.8 Diode Test
1. Set the function switch to the position.
2. Press the MODE button to touch the test probes to the diode indicate
the on the display. under test. Forward voltage will typically indicate
0.400 to 0.700V. Reverse voltage will indicate “OL”. Shorted devices will
indicate near 0V and an open device will indicate “OL” in both polarities
4.9. MAX Hold Button
To hold the highest reading on the LCD
1. Press the MAX hold button. The meter reading will not change as
readings change
2. Press the MAX hold button again to return to normal operation.
4.10. Hold Button
The Data Hold function allows the meter to “freeze” a
measurement for later reference
1. Press the “DATA HOLD” button to “freeze” the display, the “HOLD”
indicator will appear.
2. Press the “DATA HOLD” button to return to normal operation.
4.11. Auto Power Off
The auto off feature will turn the meter off after 15 minutes.
WARNING: To avoid electric shock, disconnect power to the
unit under test and discharge all capacitors before taking any
resistance measurements. Remove the batteries and unplug
the line cords.
WARNING: To avoid electric shock, never measure Continuity
on circuits or wires that have voltage on them.
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4.12. Replacing the Fuses
1. Disconnect the test leads from the meter.
2. Remove the protective rubber holster.
3. Remove the battery cover (two “B” screws) and thebattery.
4. Remove the four “A” screws securing the rear cover.
5. Lift the center circuit board straight up from the connectorsto gain
access to the fuse holders.
6. Gently remove the old fuse and install the new fuse into the holder.
7. Always use a fuse of the proper size and value (0.2A/250V fast blow for
the 200mA range).
8. Align the center board with the connectors and gently press into place.
9. Replace and secure the rear cover, battery and battery cover.
4.13. Battery Replacement
1. Both for the transmitter or receiver, when the “Low battery indicator” is
lit, it is necessary to replace the battery. Measurements may still be
made several hours after the low battery indicator
2. Remove the bottom cover and secure the screw.
3. Replace old battery with fresh two 1.5V AAA or 9V type battery.
4. Replace the bottom cover and secure the screw.
WARNING: To avoid electric shock, disconnect the test leads
from any source of voltage before removing the fuse cover.
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