Major tech MT876 Manual de usuario
MT876
600V AC/DC TRMS
MULTIMETER
INSTRUCTION MANUAL
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Contents Page no
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1. Introduction
• The meter measures AC/DC Voltage and Current, Resistance,
Diode Test, Continuity, Capacitance, Frequency, Duty Cycle and
Temperature.
• The meter also tests 1.5V and 9V batteries and offers a Non-
Contact AC Voltage detector.
• In addition, the meter detect Live/Neutral wire through a single test
lead by contact.
• Proper use and care of this meter will provide many years of
reliable service.
2. Safety
2.1. WARNINGS
• Read, understand and follow Safety Rules and Operating
Instructions in this manual before using this meter.
• The meter’s safety features may not protect the user if not used in
accordance with the manufacturer’s instructions.
• Keep fingers away from the metal probe tips when taking
measurements.
• Before changing functions using the selector switch, always
disconnect the test leads from the circuit under test.
• Comply with all applicable safety codes, Use approved personal
protective equipment when working near live electrical circuits -
particularly with regard to arc-flash potential.
• Use caution on live circuits, Voltages above 30V AC RMS, 42V AC
peak or 60V DC pose a shock hazard.
• Do not use if the meter or test leads appear damaged.
• Verify operation before using meter by measuring a known live
voltage.
• Do not use the meter in wet or damp environments or during
electrical storms.
• Do not use the meter near explosive vapors, dust or gasses.
• Do not use the meter if it operates incorrectly, protection may be
compromised.
• Do not operate meter while Low Battery warning is on, replace
batteries immediately.
• Do not apply voltage or current that exceeds the meter’s
maximum rated input limits.
2.3. International Safety Symbols
This symbol adjacent to another symbol, terminal or operating
device indicates that the operator must refer to an explanation in
the Operating Instructions to avoid personal injury or damage to
the meter.
This symbol adjacent to one or more terminals identifies them as
being associated with ranges that may, in normal use, be
subjected to particularly hazardous voltages. For maximum
safety, the meter and its test leads should not be handled when
these terminals are energized.
Double insulation
This symbol advises the user that the terminal(s) so marked must
not be connected to a circuit point at which the voltage exceeds
600 VAC or VDC
This WARNING symbol indicates a potentially hazardous
situation, which if not avoided, could result in death or serious
injury.
This CAUTION symbol indicates a potentially hazardous
situation, which if not avoided, may result in damage to the
product.
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2.1. Input Limits
Function Maximum Input
Voltage AC or DC 600V AC/DC
Frequency, Resistance,
Capacitance, 250V AC/DC
Continuity, Diode Test,
Temperature
10A Current AC or DC 10A/600V (6.3x32mm) fast acting Fuse
uA/mA Current AC or DC 500mA/600V (6.3x32mm) fast acting
Fuse
Battery Test 20V AC/DC
CAUTION: When the voltage is more than 600V, the current of uA is more
than 4000uA, the current of mA is more than 400mA, and the current of 10A
is more than 10A, the Buzzer will sound an alarm.
MAX
600V
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2.4. Safety Category Ratings
Category Rating Brief Description Typical Applications
Single phase
receptacles and
connected loads
Three phase circuits
and single phase
lighting circuits in
commercial buildings
CAT II
CAT III
• Household appliances, power
tools
• Outlets more than 30ft (10m)
from a Cat III source
• Outlets more than 60ft (20m)
from a Cat IV source
• Equipment in fixed installations
such as 3-phase motors, switch
gear and distribution panels
• Lighting circuits in commercial
buildings
• Feeder lines in industrial plants
• Any device or branch circuit that
is close to a Cat III source
• The measurement category (CAT) rating and voltage rating is determined by a
combination of the meter, test probes and any accessories connected to the
meter and test probes.
• The combination rating is the LOWEST of any individual component.
2.5. Test Leads
CAT IV 600V
CAT III 1000V
Insulated Tip On
Insulated Tip Removed
WARNING: Operation is limited to CAT II applications when the insulated tips
are removed from one or both test probes. Refer to Input Limits section in this
manual for maximum voltage ratings.
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3.1. Meter Description
1 - LCD Display
2 - Non-Contact Voltage Indicator
3 - MODE/RELATIVE Button
4 - RANGE Button
5 - MAX/MIN Button
6 - HOLD/Backlight Button
7 - Function Switch
8 - 10A Input Jack
9 - COM Input Jack
10 - Positive Input Jack
11 - Non-Contact Voltage
Detector
12 - Lanyard Hole
13 - Test Lead Holders
14 - Battery Cover Lock
15 - Tilt Stand
16 - Battery Cover
3. Description
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1 - Auto Power Off
2 - Auto Ranging
3 - Maximum
4 - Minimum
5 - Display Hold
6 - Diode Test
7 - Continuity
8 - Relative Mode
9 - Non-Contact AC Voltage Detection
10 - Live/Neutral Wire Measurement Function
11 - Degree Celsius/Degree Fahrenheit
12 - Units of Measure List
13 - Measurement Reading
14 - Low Battery
15 - Battery Test
16 - Minus Sign
17 - Direct Current
18 - Alternating Current
3.2. Symbols Used on LCD Display
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4. Button Function
4.1. MODE and REL Button
• Press the MODE Button to select AC/DC Voltage, AC/DC Current,
Frequency, Duty Cycle, Ohms, Diode Test, Continuity or Capacitance,
Temperature, NCV and Live.
• Press the REL Button for >2 second to turn on or off the Relative function.
• The Relative function zeros out the reading on the display and stores it as
a reference, subsequent readings will be displayed as the relative
difference between the actual measurement and the stored reference
value.
Note: REL does not work on Frequency, Diode Test, Continuity, NCV, Live.
4.2. RANGE Button
• When the meter is first turned on, it automatically goes into Auto Ranging.
• This automatically selects the best range for the measurements being
made and is generally the best mode for most measurements.
• For measurement situations requiring that a range be manually selected,
perform the following:
1. Press the RANGE Button, the “AUTO” display indicator will turn off.
2. Press the RANGE Button to step through the available ranges until you
select the range you want.
3. Press and hold the RANGE Button for 2 seconds to exit the Manual
Ranging mode and return to Auto Ranging.
4.3. MAX/MIN Button
1. Press the MAX/MIN Button to activate the MAX/MIN mode, the “MAX”
indicator will appear on the LCD display, the meter will display and hold the
maximum reading and will update when a higher “max” occurs.
2. Press the MAX/MIN Button again to view the lowest reading, the “MIN”
indicator meter will appear on the LCD display, the meter will display and
hold the minimum reading and will update when a lower “min” occurs.
3. Press and hold the MAX/MIN Button to end MAX/MIN and return to normal
operation.
Note: The meter does not auto range when the MAX/MIN mode is active, the
display will read OL if the range is exceeded. When this occurs, exit
MAX/MIN and use the RANGE button to select a high range. MAX/MIN does
not work on Frequency, Duty Cycle, Diode Test, Continuity and Capacitance.
4.4. HOLD/Backlight Button
• Press the HOLD/Backlight Button to turn on or off the HOLD
function.
• Press the HOLD/Backlight Button for >2 second to turn on or off
the Backlight function.
4.5. Auto Power Off
• The auto off feature will turn the meter off after 15 minutes.
• To disable the auto power off feature, hold down the MODE Button
and turn the meter on.
4.6. Low Battery Indication
• The “ ” icon will appear in the lower left corner of the display
when the battery voltage becomes low.
• Replace the battery when this appears.
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