Major tech MT933 User manual

INSTRUCTION MANUAL
CABLE LENGTH TESTER
MT933

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Contents Page no
1. Description.......................................................................................4
2. Safety Instructions............................................................................4
3. General Description...........................................................................4
4. Meter Description..............................................................................5
4.1. Instrument Description..............................................................5
4.2. Symbols and Annunciators.........................................................6
4.3. Accessories Provided.................................................................6
5. Description of Function Keys...............................................................6
5.1. Backlight Button.......................................................................6
5.2. Hold Button..............................................................................6
5.3. MEM Button..............................................................................7
5.4. CAL Button...............................................................................7
5.5. FT/M Button.............................................................................7
5.6. Cu/AI Button............................................................................7
5.7. Up/Down Button.......................................................................7
6. Operating.........................................................................................8
6.1. Calibration Procedure................................................................8
6.2. Measuring Length of Wire..........................................................9
6.3. User Select Mode.....................................................................11
6.4. How to save the resistance of a user wire....................................11
6.5. Measure the length of cable in user-defined mode.......................12
6.6. Clear memory locations in user select mode................................13
6.7. Measuring Resistance..............................................................13
6.8. Measuring Temperature...........................................................13
7. Maintenance...................................................................................14
8. Battery Installation..........................................................................14
9. Specifications.................................................................................15
9.1. Technical Specifications...........................................................15
9.2. General Specifications.............................................................15

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3. GENERAL DESCRIPTION
The instrument carries out the following measurements:
1. Twenty measurement gears in line with industry standards: 0.15, 0.25,
0.5, 0.75, 1, 1.5, 2.5, 4, 6, 10, 25, 35, 50, 70, 95, 120, 150, 185,
240mm².
1. DESCRIPTION
• The Cable Length Meter is a hand-held testing device with the following
measurement capabilities: resistance, temperature and length.
• They can be used as mΩ meters to measure precise bonding
resistances.
• The primary function of these meters is to calculate the length of cable
based upon its material, temperature, and cable gauge, Cable material
type can be either uncoated copper or aluminum.
• There are 20 pre-programmed and eight programmable cable gauges.
(There are no strands per cable specification for the eight programmable
switch positions.)
WARNING: observe the instructions given in this manual;
improper use could damage the instrument or its components.
2. SAFETY INSTRUCTIONS
Double-insulated meter
• Do not connect this unit to live voltage.
• Do not expose this unit to rain or moisture.
• Do not use the unit if it is wet or damaged.
• Do not operate with the case open.
• Do not attempt to repair this unit. it contains no user serviceable parts.
• Do not expose the unit to extremes in temperature or high humidity,
Refer to "Specifications."
• Before opening the case, remove the test leads from the circuit and shut
off the unit.
• Using this unit near equipment that generates electromagnetic
interference can result in unstable or inaccuratereadings.
• Inspect the test leads or accessory before use, they must be clean and
dry, and the insulation must be in good condition.
• Use this unit for the manufacturer's intended purpose only, as described
in this manual, any other use can impair the protection provided by the
unit.
• Failure to observe these warnings could result in severe injury or death.

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2. Eight memory locations in user select mode.
3. mΩ resistance test mode.
4. Measures copper and aluminum cables.
5. Ambient temperature testing provides automatic compensation for
measurements.
4. METER DESCRIPTION
4.1. Instrument Description
1 - LCD Display
2 - MEM Button
3 - CAL Button
4 - FT/M Button
5 - HOLD Button
6 - UP Button
7 - Cu/ Al Button
8 - DOWN Button
9 - Backlight Button
10 - Rotary Selector Switch
11 - Test Lead Holders
12 - Lanyard Hole
13 - Battery Cover
14 - Tilt Stand
15 - Black Input Terminal
16 - Red Input Terminal
17 - NTC

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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℃ to 40℃ (32℉ to 104℉)
Storage temperature –10℃ to 50℃ (14℉ to 122℉)
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℃ to 40℃(32℉ to 104℉)
Storage temperature –10℃ to 50℃(14℉ to 122℉)
Continuity test Beep if less than 100Ω
Cable voltage check 5V to 16V DC
Function Range
4.3. Accessories Provided
• Carrying Bag
• User Manual
• Copper Rod
• Kelvin Clips x 2
4.2. Symbols and Annunciators
1 - Used to save data or for confirmation
2 - Temperature
3 - Celsius and Fahrenheit units
4 - Low Resistance
5 - Copper
6 - Aluminum
7 - Calibrate
8 - Measurement display digits
9 - milliohms (Resistance)
10 - ln user select mode
11 - kilo meter foot
12 - Data Hold
13 - ERROR
14 - Auto Power Off
15 - Low battery
16 - Negative reading display
17 - NTC
5. DESCRIPTION OF FUNCTION KEYS
5.1. Backlight Button
• Press the Backlight Button to turn on the backlight.
• Press the Backlight Button again to turn off the backlight.
5.2. HOLD Button
• Press the HOLD Button, the present reading on the bottom line of the
display will be held on the display.
• To exit Data Hold mode, press the HOLD Button again.

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5.3. MEM Button
• The MEM Button is used for the user-selected programming function.
• Refer to "Operation" for a complete description of the programming
process.
• Press and hold the MEM Button to cancel the auto-shutdown function.
5.4. CAL Button
• The meter must be calibrated each time it is turned ON.
• Refer to "Operation" for a complete description of the calibration
process.
• Used to enter/exit sample wire length setting mode.
5.5. FT/M Button
• Press momentarily to select length measurement units.
• On the LCD, "ff indicates feet and "m" indicates meters.
5.6. Cu/AI Button
• Press the Cu/Al Button to select copper or aluminum wire
measurement.
• Press and hold the Cu/Al Button to select °C/°F.
5.7. Up/Down Button
• Used during the user-selected programming process.
• Refer to "Operation" for a complete description of the programming
process.

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WARNING: Do not connect the unit to live voltage.
6. 0PERATING
6.1. Calibration Procedure
1. Each time the meter is turned ON, it should be calibrated before use.
2. Set the rotary switch from the OFF to O Position.
3. Connect the two leads for the red set of Kelvin clips are plugged into
the red terminals on the meter; Connect the two leads for the black set
of Kelvin clips are plugged into the black terminals on the meter.
Note: Make sure the calibration bar and Kelvin clips jaws are clean.
4. Connect the two alligator clips to the supplied copper rod, move the
clips as close together as possible.
Make sure that the clips are as close together as
possible in order to improve calibration accuracy.

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5. Press the CAL Button, the display alternately shows " " and
" "; flash twice each time. Press the MEM Button, if the display
briefly shows " " and then the meter returns to resistance
measurement mode, the calibration succeeds.
6.lf the display show " " after you press the MEM Button, the
calibration fails and you need to check whether the connections and
contacts an correct and good. If you press the CAL Button again, the
meter will cancel calibrating and return to resistance measurement
mode.
6.2. Measuring Length of Wire
1. Set the rotary switch from the OFF to Ω Position.
2. Calibrate the meter as described in "Calibration Procedure".
3. For best results, allow the meter and the wire to be measured to attain
the same ambient temperature. Typically, it will take about 30 minutes.
4. Strip the insulation back on each end of the wire to be measured.
Note: make sure both ends of the wire are clean and the conductor is
fully exposed. Use abrasive paper to remove oxide layer on each end if
necessary.
5. Set the rotary switch from the OFF to Wire Gauge Position according to
the wire gauge of the wire to bemeasured; for example If the wire
gauge of the wire is 1 mm1 , you must set the rotary switch in the "1"
Position.
6. lf the wire to be measured is a copper wire, press the Cu/Al Button until
"Cu" appear on the display: If the wire is an aluminum wire, press the
Cu/Al Button until "Al" appears on the display.
7. Press the FT/M Button to select desired unit.
8. Connect an alligator clip to one end of the wire to be measured and
the other alligator clip to the other end of this wire.
WARNING: Do not connect this unit to live voltage.

9 . The display shows the length of the wire.
10. When the measurements finishes, remove the alligator clips from the
wire.
Typical Configuration
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6.3. User Select Mode
• The use select mode allows user to save the resistance parameter of a
user wire for length measurements of the wires of the same kind(Same
gauge and same conductor material).
• In addition, it enables user to accurately measure the length of standard
gauge wires.
• In this mode, user can measure the length of any metal wires (including
copper or aluminum wires).
Note: The sample length of user wires must be between 4m and 100m in
METER mode or between 13.1ft and 320ft in FEET mode.
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6.4. How to save the resistance of a user wire
Note: Prepare a 4-100m(or 13. 1ft-320ft in FEET MODE) Sample length of
the wire to be programed into the meter
so that the meter can correctly measure the resistance of this sample wire
and store it in lengths of the same kind
wire when you want. Make sure the sample wire to be measured is not
energized or live.
1. Set the rotary switch from the OFF to Ω Position.
2. Calibrate the meter as described in "Calibration Procedure".
3. For best results, allow the meter and the sample wire to be measured to
attain the same ambient temperature.
4. Remove the insulation at both ends of the cable under test.
Note: Make sure that the two conductors of the cable under test are clean
and fully exposed, and that the insulation must be removed to make it
easier for the test rod to fully clamp the cable. If desired, use an abrasive
paper to clean the exposed wire head.
5. The rotary knob selects the user-defined mode gear, and there are 1 to
8 (8) user-defined mode gears on the meter, the selected gear is
displayed in the upper left corner of the screen.
6. For example, when the user selects the knob, " " will be displayed
on the screen if the selected gear already has a cable parameter, the
screen will display "OL".
7. Press the FT/M Buttons to select feet or meters.
8. Press the CAL Button, The meter enters sample wire length setting
mode; in this mode, the display alternately show " " and
" " among them "MEM" and "TCAL" flash twice each time.

9. Press the upper end of the Up/Down Button to increase or the lower
end of this button to decrease the reading on the display in 0.1
increments or decrements, adjust the reading until it equals the length
of the sample wire to measured.
10. Connect an alligator clip to one end of the sample wire and the other
alligator clip to the other end of this wire.
11. Press the MEM Button once, if the display shows " " briefly and
then the meter returns to measurement mode, the setting was
accepted.
Note: If the display shows " ", and "ERROR", the setting fails and
you should check whether the connections and contacts are correct and
good. Press the CAL Button again, the meter will return to measurement
mode.
12. When the setting finishes, remove the two alligator clips from the
sample wire.
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6.5. Measure the length of the cable in user-defined mode
1. Set the rotary switch from the OFF to Ω Position.
2. Calibrate the meter as described in "Calibration Procedure".
3. For best results, allow the meter and the sample wire to be measured
to attain the same ambient temperature.
4. Remove the insulation at both ends of the cable under test.
Note: Make sure that the two conductors of the cable under test are
clean and fully exposed, and that the insulation must be removed to
make it easier for the test rod to fully clamp the cable. If desired, use
abrasive paper to clean the exposed wire head.
4. With the knob, select the appropriate user-defined gear measurement.
5. Press the FT/M Button to select feet or meters.
6. Connect the Kelvin Clips to the metal ends of the cable under test.
7. The cable length is read directly from the screen.
8. When the measurement is complete, disconnect the Kelvin Clips.

6.6. Clear memory locations in user select mode
1. Disconnect the Kelvin Clips from the cable under test.
2. The knob selects the user-custom gear that needs to be cleared.
3. Press CAL Button to display " ". Press the MEM Button again,
the meter will erase the stored data in the selected memory location
and the meter will return to measurement mode and the selected
memory location is empty.
4. The symbol " " means that pressing the MEM Button will
erase the stored data in the selected memory location, the symbol
" " means that pressing the CAL Button will cause the meter
to return to measurement mode.
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6.7. Measuring Resistance
1. Set the rotary switch from the OFF to Ω Position.
2. Calibrate the meter as described in "Calibration Procedure".
3. For best results, allow the meter and the sample wire to be measured
to attain the same ambient temperature.
4. Remove the insulation at both ends of the cable under test.
Note: Make sure that the two conductors of the cable under test are
clean and fully exposed, and that the insulation must be removed to make
it easier for the Kelvin Clips to fully clamp the cable. If desired, use
abrasive paper to clean the exposed wire head.
5. Connect the two leads for the red set of Kelvin clips are plugged into
the red terminals on the meter; Connect the two leads for the black set
of Kelvin clips are plugged into the black terminals on the meter.
6. The screen shows the impedance value read directly.
6.8. Measuring Temperature
1. The temperature reading shown on the display.
2. When the temperature is lower the -5°C or 23°F, the display will show
"-OL".
3. When the temperature is higher the 50°C or 122°F, the display will
show "OL".
4. Press and hold Cu/Al Button to select °C/°F.

7. MAINTENANCE
• Keep the meter dry. If it gets wet, wipe it off.
• Use and store the meter in normal temperatures, temperature extremes
can shorten the life of the electronic parts and distort or melt plastic
parts.
• Handle the meter gently and carefully, dropping it can damage the
electronic parts or the case.
• Keep the meter clean, wipe the case occasionally with a damp cloth, do
not use chemicals, cleaning solvents or detergents.
• Use only fresh batteries of the recommended size and type, remove old
or weak batteries so they do not leak and damage the unit.
• If the meter is to be stored for a long period of time, the batteries
should be removed to prevent damage to the unit.
WARNING: Before opening the case, remove the test leads from the
circuit and shut off the unit. This Meter is designed to provide years of
dependable service, if the instructions below are followed:
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8. BATTERY INSTALLATION
• Keep the meter dry, if it gets wet. wipe it off.
• Use and store the meter in normal temperatures, temperature extremes
can shorten the life of the electronic parts and distort or melt plastic
parts.
• Handle the meter gently and carefully, dropping it can damage the
electronic parts or the case.
• Keep the meter clean, wipe the case occasionally with a damp cloth, do
not use chemicals, cleaning solvents or detergents.
• Use only fresh batteries of the recommended size and type, remove old
or weak batteries so they do not leak and damage the unit.
• If the meter is to be stored for a long period of time, the batteries
should be removed to prevent damage to the unit.
WARNING: To avoid electric shock, disconnect the test leads from any
source of voltage before removing the battery cover.

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Function Range Resolution Accuracy Protection
against
overcharge
Length 1 000m 0.1m ±(1% reading+1ml)
Max 60V
Measurement 10 000m 1m ±(1% reading+1ml)
Overload
Range 30km 0.01km ±(1.2% reading+1ml)
Protection
1 000ft 0.1ft ±(1% reading+3ft)
10 000ft 1ft ±(1% reading+1ft)
100kft 0.01ft ±(1.2%reading+1ft)
Resistance 1999.9mΩ 0 0.1mΩ ±(1.0%reading+3 digits)
Max 60V
Measurement 19.999Ω 0.001Ω ±(1.0%reading+0.5mΩ) Overload
Range 199.99Ω 0.01Ω ±(1.0%reading+50mΩ) Protection
1999.9Ω 0.1Ω ±(1.0%reading+6 digits)
Temperature -5 to 50°C 0.1°C ±(2.0%+1.8°C)
Measurement 23 to 122°F 0.1°F ±(2.0%+3.5°C)
9. SPECIFICATIONS
9.1. Technical Specifications
9.2. General Specifications
Display (19999 counts) LCD display
Low Battery Indication " " is displayed
Overrange Indication "OL" display
Operating Temperature 0 to 40°C (32 to 104°F)
Storage Temperature -20 to 60°C (-4 to 140°F)
Operating Humidity Max 80% up to 31°C (87°F) decreasing linearly
to 50% at 40°C (104°F)
Storage Humidity <80%
Operating Altitude 2000 meters (7000ft.) maximum.
Drop Protection 1m (3.3ft)
Battery 6 x 1.5V AA Batteries
Low Battery Indicator Approximately 7.2V
Battery Life Capacity - 900mAh
Auto Power Off After approx. 15 minutes
Dimensions 210 x 97 x 68mm
Weight 634g
RangeFunction

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