Major tech MT915 User manual

MT915
2-in-1 Cable Identifier & DMM

Thank you for purchase of the 2-in-1 Cable Identifier & DMM.
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 test cables
installed far distances away either on wall plate or patch panel.
The digital multimeter function makes it easy to measure
DC/AC voltage, DC/AC current, Resistance, continuity & diode.
INTRODUCTION
Features
ŸCuts out “Bell-Out” time
ŸCable resistance 30kΩ max
ŸMeasures AC/DC V 600V
ŸAC/DC A to 200mA
ŸResistance 20MΩ
ŸDiode check
Ÿ2000 Count LCD
ŸContinuity
5
4
2
1
2
6
OP
ON
CABLE TESTER
CABLE IDENTIFIER
Transmitter Description
1. OFF/ON switch
4.3 Voltage check
2. Low battery indicator
3. Operation indicator
4. Cable plug
5. Crocodile clips with cables
(CH1 to CH16 & reference
cable)
6. Battery cover &
compartment

Receiver Description
7. Crocodile clips with cables
(CH1 & reference cable)
8. LED display (Blue 2 bit)
9. Low battery indicator
10. Operation indicator
11. Tester switch for receiver
test or test cable of put
through and cable
disconnection & identify
12. Voltage check switch for
on cable voltage check
13. OFF/ON switch
CABLE TESTER
CABLE IDENTIFIER
7
8
12
14
15
17
20
21
9
10
11
13
16
18
Vcheck
19
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, Ω input jack
21. Battery cover &
compartment (Receiver &
DMM)
Digital Multimeter
Description
Measuring Procedure
Transmitter & Receiver operation
1. At one end of the cable, connect the transmitter terminals
marked “CH1 to CH16” to each core of the cable under
tester. Connect the “COM” reference lead (black crocodile)
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 crocodile) of the receiver.
When the “input terminal” (red crocodile) of the receiver is
successively touched on the cores of the cable under test,
the relevant number indicating the core 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 have a protection
circuit built in, however do not apply voltage over 50V (AC
or DCV) to any crocodile clips of transmitter or receiver.
Otherwise the instruments may defect permanently.
Beep alarm test
Depress the “R TEST” button down on the receiver, using
the 2 Croc clips connect to the cables under test for
continuity. If beep sounds there is continuity, if no sound
then either there is a break in the cable or the wrong cable
is connected.
CAUTION: Beep if less than 100Ω
Voltage check
Depress the “V check” button down on the receiver.
Connect the black crocodile to “COM” reference and the red
crocodile connect to the cable port. If the two digit blue
LED display's “UU ”, it indicates there is voltage on the
cable. This check is used for mains voltage indication only.
CAUTION: Check voltage range at 5V to 16V DC

Digital Multimeter test
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.
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.
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 the
display.
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

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.
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.
WARNING: To avoid electric shock, never measure
continuity on circuits or wires that have voltage on them.
Diode Test
1. Set the function switch to the position.
2. Press the MODE button to Touch the test probes to the
diode indicate 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
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.
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.
Auto Power Off
The auto off feature will turn the meter off after 15
minutes.
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 the
battery.
4. Remove the four “A” screws securing the rear cover.
5. Lift the center circuit board straight up from the
connectors to 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.
WARNING: To avoid electric shock, disconnect the test
leads from any source of voltage before removing the fuse
cover.
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.

MAJOR TECH (PTY) LTD
T9 Industrial Village, Sam Green Road, 7
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]
www.major-tech.com
Specifications
Dimensions (mm)
DC Voltage
DC Voltage
DC Current
AC Current
Resistance
Continuity Check
Max Input Voltage
Diode Test
Display
Over range Indication
Polarity
Low Battery Indication
Input Impedance
AC Response
Weight
ACV Bandwidth
Auto Power Off
Operating Temp
Storage Temp
Batteries
Fuse
FUNCTION RANGE
0.1mV ~ 600V (1.0% + 3)
0.001V ~ 600V (1.0% + 5)
0.1µA ~ 200mA (1.5% + 3)
0.1µA ~ 200mA (1.8% + 8)
0.1Ω ~ 20mΩ
Audible signal if the resistance is <150
600V AC/DC
Test current 1mA max.,
open circuit voltage of 1.5V typical
2000 count 3 - 1/2 digit LCD
LCD displays “OL”
Minus (-) sign for negative polarity.
“BAT” symbol indicates low battery condition.
>7.5MΩ (VDC & VAC)
Average responding
162(L) x 75(W) x 44(D) (DMM)
130(L) x 69(W) x 32(D) (Transmitter)
308g
50Hz to 60Hz
15 minutes (approximately)
0°C to 40°C
-10°C to 50°C
9V battery & 2 “AAA” batteries
mA, µA ranges; 0.2A/250V fast acting Fuse