Major tech MT900 User manual

INSTRUCTION MANUAL
CABLE LENGTH METER
MT900

MT900 is a precision cable length meter by using TDR (Time
Domain Reflectometer) technology to measure cable length.
The meter can be used for any cable consisting of at least two
insulated metallic elements, one of which may be the sheath or
shield of the cable. The meter has automatic internal matching
networks to allow testing with automatic selection range, which
correspond to power, telephone, CAT V and LAN, cables etc.
The meter can be closely matched to the cable under test using
the function selection keys. The velocity of propagation (V.O.P.)
value can be similarly adjusted to match the cable under test,
thus ensuring an accurate distance measurement.
INTRODUCTION
Features
ŸHigh accuracy and fast reflection
ŸEasy to use
Ÿ2.4 inch TFT color screen
ŸUser friendly menu on screen
ŸAuto-Zero and Auto Range, Auto adjust sensitivity, can
measure various cables
ŸBuilt-in 20 groups of standard cable V.O.P. value
ŸOptional auto power off time
ŸAuto-Sensitivity allows for closer matching to a wide range of
cables under test. Only V.O.P. Settings required
ŸMeasuring capability of the V.O.P. of a sample cable
Ÿ99 internal memory locations store up to 99 traces for future
analysis

Ÿ 2 x 1.5V AA LR6 battery
Ÿ Belt (S2C)
Ÿ User manual
Ÿ Transfer parts (X2)
Accessories
Instrument Parts Introduction
1. Coaxial cable connection (BNC socket)
2. Network cable connection (RJ-45 socket)
3. LCD display
4. MEAS/OK button
5. COAX/DATA switch button
6. SET button
7. button(move up/ increase button)
8. button(move down/ decrease button)
9. EXIT/POWER button

OPERATING INSTRUCTIONS
Power On: Press and hold the button
Power Off: Press and hold the button for 3 seconds
(The instrument will automatically turn off after 10min after
being inactive.)
After turning on the instrument, the default interface is data
cable length measurement. If you want to enter the functions
menu, press the button once. Press the button once again
to return to the measurement interface.
After enter functions menu, you can use the or button to
select any function you need. After you have chosen the function,
press the button to enter next display.
Inserting/Replacing Batteries
Power On and Off
1. Remove battery compartment lid.
2. Insert batteries according to the mark of battery box
3. Close the battery compartment again.
Function menus
ŸReplace the batteries when the battery symbol flashes red
in the display
ŸUse alkaline batteries only.
ŸRemove the batteries before any long period of non-use to
avoid the danger of corrosion.

Cable measurement
Ÿ Connect the cable to MT900 cable socket. (If the cable is a
network cable, connect the network cable to the MT900 RJ45
cable socket. If the cable is a coaxial cable, connect the
coaxial cable to the MT900 BNC socket.)
Ÿ Set the instrument to the cable measurement mode,
there are two ways to enter the cable measuring
interface:
The boot default interface is network cable measurement.
Press the button once to select network cable measurement,
coaxial cable measurement, or single-wire cable measurement.
1. Enter functions menu, press the or button to
select , then press the button once to enter El
the cable selection interface.
2. Then press the or button again to select the cable
measurement mode.
The second:
The first:

1. Select the V.O.P. of the network to be tested from the library.
Press the button once to enter the library. Press the or
button to select the corresponding network cable. Press the
button once to complete the V.O.P. settings.
2. Adjust the current V.O.P. slightly.
Press and hold the button until the V.O.P. value shows the
anti black state. Press the or button to increase or
decrease the V.O.P. value, Press the button once to
complete the V.O.P. settings.
Ÿ Select the V.O.P. of the network to be tested from the library,
or adjust the current V.O.P. slightly.
ŸPress the button once to complete a measurement. LCD
displays the length of cable to be measured.
ŸPress the button once to clear the measurement
Ÿ Press the button to enter the cable measurement

ŸAfter entering the function menu, press the or button to
select . Press the button once to enter V.O.P.
function selection interface.
Ÿ After entering the cable selection, press the or button to
select . Press the button once to enter the cable
database selection interface.
Ÿ After entering the cable database selection, press the or
button to select the appropriate database.
Ÿ Press the button once to enter the cable database.
ŸPress the or button to select the corresponding cable
name. Press the button once to enter the corresponding
cable measurement. Press the button once to enter the
current cable details.
Cable Library V.O.P.

ŸIn the current cable details interface, press the button to
return to the database. Press the button, this will show
indication whether to delete the current data information. To
delete, press the button. If you do not want to delete,
press the button once to return to the database.
Measurement and storage of V.O.P. values
1. Insert the known length cable (greater than 10 meters) into
the instrument.
2. After entering the function menu, press the or button to
select , press the button to enter the V.O.P.
function selection interface.
3. After entering the cable selection, press the or button to
select , press the button to enter the V.O.P. TEST
interface.
In the case that the V.O.P. is unknown of the cable measured, the
V.O.P. can be detected by the length of a known cable.

4. In the V.O.P. TEST interface, press the or button to
select , press the button once then the length
display becomes anti-black.
5. Press the or button to adjust the value and the actual
length to be the same, then press the button once to
measure the V.O.P. of the cable.
6. Name storage. Press the or button to select ,
press the button once to enter the name storage.
Ÿ Press the or button to select , press the
button once to enter the cable type selection. Press the or
button to select 51Ω, 75Ω or 100Ω. Press the button once
to complete the cable impedance storage.
Ÿ Press the button once to complete the measurement and
storage of V.O.P. value.
Cable impedance type selection
Press the or button to select , press the button
once to enter the manufacturers information storage. The mode
of operation is the same as name storage.
Manufacturer 's information storage
Press the or button to select , press the button
once to enter the cable type selection. Press the or button to
select data, coaxial, single-wire. Press the button once to
complete the cable type selection.
Cable type selection
Ÿ Select the character, starting with "A"
Press the button, characters change from 9 to 0
Press the button, characters change from A to Z.
Ÿ Press the button once to store the selected characters,
the maximum number of stored characters is 6.
Press the button once to clear the selected character
Press the button to move a character behind.
Ÿ Press the button to complete the name storage.

In the case of V.O.P. known cable, the V.O.P. value of the cable
can be stored directly.
3. Repeat step 6-10 in Measurement and storage of V.O.P.
to complete the V.O.P. storage.
1. After enter the function menu, press the or button to
select , Press the button to enter the history
interface.
Edit and storage of V.O.P. value
1. After enter the function menu, press the or button to
select , press the button once to enter the V.O.P.
function selection interface.
2. After enter the cable selection, press the or button to
select , press the button to enter the V.O.P. Edit
interface.
History

After eater the function menu, press the or button to select
. Press the button once to enter setting.
Press the or button to select . Press the
button once to enter the date of the year. Press the or button
to set the current year.
System settings
Unit setting
Time setting
Date setting
After entering the function setting, press the or button to
select . Press the button to enter unit setting. Press
the or button to select the measurement unit, ft or m (1m =
3.281ft), press the button once to complete the unit setting.
Press the or button to select . Press the
button to enter time of hour setting. Press the or button to
set current time. Press the button again to set the minutes.
Press the or button to set current time. Press the button
to complete the time setting.

1. Do not operate with electricity
2. When the battery symbol turns red, you need to replace the
battery. Otherwise the key operation will cause the screen to
blink and it may affect the accuracy of the measurement.
Press the button once to set month, press the or button to
set current month. Press the button to set date, press or
button to set current date. Press the button once to complete
the date setting.
Auto power off time setting
Press the or button to select . Press the
button once to enter the auto power off time setting. Press the
or button to select auto power off time. Press the button
once to complete the auto power off time setting.
Measurement conditions

Minimum distance: Pair cable, Coaxial Cable or
Cable Tester >5m
Maximum distance: Depends upon the V.O.P of the
cables under test.
3.0km @ V.O.P. ≤99.9%
2.4km @ V.O.P. ≤80.0%
2.0km @ V.O.P. ≤66.0%
1.5km @ V.O.P. ≤50.0%
Range Selection: Automatic range control
Resolution: 0.1m
Accuracy: ± [2% of reading ±0.2m] < 100m
± [2% of reading ±0.5m] ≥ 100m
Impedance Selection: Automatic output impedance
control
Velocity Factor: Adjustable from 1.0% to 99.9%
Cable Library: 20 standard cable types
Memory Location: 99 for custom cable types
Connector Type: BNC, RJ45
Batteries: 2 LR6 (AA) type 1.5V alkaline
Operating Temperature: 0°C to 40°C (32°F to 104°F)
Storage Temperature: -10°C to 50°C (14°F to 140°F)
Relative Humidity: 0% to 80%RH
Size (H X W X D): 152 X 61 X 34mm
Weight: 227,9g
General Specifications
Function Range

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