Major tech MT1880IV User manual

2
Introduction
This meter measures VGB ，AC/DC Voltage, AC/DC Current,
Resistance, Capacitance, Frequency (electrical & electronic), Diode
Test, and Continuity plus. Proper use and care of this meter will
provide many years of reliable service.
Safety 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 WARNING symbol indicates a potentially
hazardous situation, which if not avoided, could
result in death or serious injury.
This CAUTION symbol indicates a potentially haza
rdous situation, which if not avoided, may result
damage to the product.
This symbol advises the user that the terminal(s)
so marked must not be connected to a circuit point
at which the voltage with respect to earth ground
exceeds (in this case) 1000 VAC or VDC.
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.
This symbol indicates that a device is protected
throughout by double insulation or reinforced
insulation.
WARNING
CAUTION
MAX
1000V

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PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY I
Equipment of OVERVOLTAGE CATEGORY I is equipment for
connection to circuits in which measures are taken to limit the
transient overvoltages to an appropriate low level.
Note –Examples include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY II is energy-consuming
equipment to be supplied from the fixed installation.
Note –Examples include household, office, and laboratory appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in fixed
installations.
Note –Examples include switches in the fixed installation and some
equipment for industrial use with permanent connection to the fixed
installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for use at the
origin of the installation.
Note –Examples include electricity meters and primary over-
current protection equipment

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SAFETY INSTRUCTIONS
This meter has been designed for safe use, but must be operated with
caution. The rules listed below must be carefully followed for safe
operation.
1. NEVER apply voltage or current to the meter that exceeds the
specified maximum:
Input Protection Limits
Function
Maximum Input
V DC or V AC
1000VDC/750VAC rms
mAAC/DC
500mA 1000V fast acting fuse
AAC/DC
10A 1000V fast acting fuse (20A
for 30 seconds max every 15
minutes)
Frequency, Resistance,
Capacitance, Duty Cycle,
Diode Test, Continuity
1000VDC/750VAC rms
2. USE EXTREME CAUTION when working with high voltages.
3. DO NOT measure voltage if the voltage on the "COM" input jack
exceeds 1000V above earth ground.
4. NEVER connect the meter leads across a voltage source while
the function switch is in the current, resistance, or diode mode.
Doing so can damage the meter.
5. ALWAYS discharge filter capacitors in power supplies and
disconnect the power when making resistance or diode tests.
6. ALWAYS turn off the power and disconnect the test leads before
opening the covers to replace the fuse or batteries.

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7. NEVER operate the meter unless the back cover and the battery
and fuse covers are in place and fastened securely.
If the equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be
impaired.

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Controls and Jacks
REL MIN
1. 4,000 count LCD display
2. RANGE button
3. Backlight and Hold button
4. MODE button
5. Function switch
6. mA, µA and 10A input jacks
7. COM input jack
8. Positive input jack
9. VGB
10. REL button
11. MAX/MIN button
Note: Tilt stand and battery compartment are on rear of unit.

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Symbols and Annunciators
•))) Continuity
Diode test
Battery status
n nano (10-9) (capacitance) 
µ micro (10-6) (amps, cap)
m milli (10-3) (volts, amps)
A Amps
k kilo (103) (ohms)
F Farads (capacitance)
M mega (106) (ohms)
 Ohms
Hz Hertz (frequency) V Volts
REL Relative
AC Alternating current AUTO Autoranging
DC Direct current HOLD Display hold
ºF Degrees Fahrenheit ºC Degrees Centigrade
MAX Maximum MIN Minimum
AUTO Auto Range
Timing symbol
Backlight
bargraph

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Operating Instructions
WARNING: Risk of electrocution. High-voltage circuits, both AC and
DC, are very dangerous and should be measured with great care.
1.ALWAYS turn the function switch to the OFF position when the
meter is not in use.
2.If “OL”appears in the display during a measurement, the value
exceeds the range you have selected. Change to a higher range.
DC VOLTAGE MEASUREMENTS
CAUTION: Do not measure DC voltages if a motor on the circuit
is being switched ON or OFF. Large voltage surges may occur
that can damage the meter.
1. Set the function switch to the “DC”position(V== or VDC-AC ).
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive Vjack.
3. 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.
4. Read the voltage in the display.

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VGB （VAC ONLY）
“Ghost” voltage means voltage that appears on a conductor that
is not actually energized. This often occurs on spare conductors in
a conduit or cable. The spare conductors are very close to the live
conductors. The capacitance between the live and spare conductors
causes the “ghost” voltage to appear when the measurement is made
with a high impedance meter. A DMM with 10 MΩ input impedance is
one example of a high impedance meter. The VGB network is connected
across the input terminals to provide low input impedance. Low
input impedance is used to reduce any “ghost” voltage to very small levels,
about 2 to 5 volts.
By engaging the VGB (a bleep will sound every 3 seconds to
confirm VGB is engaged) mode your DMM can distinguish a ghost
voltage by effectively ‘Killing’it. If the voltage being measured is a
true (hard) voltage(10-15 Vac) the multimeter will automatically switch
to true voltage measurement mode .
AC VOLTAGE MEASUREMENTS
CAUTION: Do not measure AC voltages if a motor on the circuit
is being switched ON or OFF. Large voltage surges may occur
that can damage the meter.
1. Set the function switch to “AC”position(V~ or VDC-AC).
2. Insert the black test lead banana plug into the negative COM jack.
Insert red test lead banana plug into the positive Vjack.
3. Touch the black test probe tip to the neutral side of the circuit.
Touch the red test probe tip to the “hot” side of the circuit.
4. Read the voltage in the display

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AC/DC CURRENT MEASUREMENTS
CAUTION: Do not make 10A current measurements for longer
than 30 seconds. Exceeding 30 seconds may cause damage to
the meter and/or the test leads.
1. Insert the black test lead banana plug into the negative COM jack.
2. For current measurements up to 4000µA AC/DC, set the function
switch to the µA position and insert the red test lead banana plug
into the µA/mA jack,press mode button
to select AC or DC.
3. For current measurements up to 400mA DC, set the function
switch to the mA position and insert the red test lead banana plug
into the µA/mA jack ,press mode button to select AC or DC.
4. For current measurements up to 10A DC, set the function switch
to the 10A position and insert the red test lead banana plug into
the 10A jack, press mode button to select AC or DC.
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.

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RESISTANCE MEASUREMENTS
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.
1. Set the function switch to the ΩCAP position.
2. Insert the black test lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive jack.
3. Press the MODE button to indicate “”on the display.
4. 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.
5. Read the resistance in the display.
CONTINUITY CHECK
WARNING: To avoid electric shock, never measure continuity on
circuits or wires that have voltage on them.
1. Set the function switch to the
ΩCAP position.
2. Insert the black lead banana plug into the negative COM jack.
Insert the red test lead banana plug into the positive jack.
3. Press the MODE button to indicate“ Ω” 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 30, the audible
signal will sound. If the circuit is open, the display will indicate
“OL”.

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DIODE TEST
1. Set the function switch to the
ΩCAP position.
2. Insert the black test lead banana plug into the negative COM jack
and the red test lead banana plug into the positive Vjack.
3. Press the MODE button to indicate“ “and “V” display.
4. Touch the test probes to the diode 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.
CAPACITANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect power to the unit
under test and discharge all capacitors before taking any
capacitance measurements. Remove the batteries and unplug the
line cords.
1. Set the rotary function switch to the
Ω CAP position.
2. Insert the black test lead banana plug into the negative COM jack.
3. Insert the red test lead banana plug into the positive Vjack.
4. Touch the test leads to the capacitor to be tested.
Read the capacitance value in the
Display

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FREQUENCY MEASUREMENT
1. Set the function switch to the Hz/Duty position.
2. Insert the black test lead banana plug into the negative
( - ) jack (COM) and the red test lead banana plug into
the positive ( + ) jack ( F ).
3. Touch the test probe tips to the circuit under test.
4. Read the frequency in the display. The digital reading will
indicate the proper decimal point, symbols (Hz, kHz,
MHz ) and value.
NOTE: Press the mode key to select the frequency or the duty
cycle measuring.
SELECT BUTTON
1. To select DC/AC current or voltage or resistance/capacitance
Diode/Continuity or Hz/duty
DATA 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 reading on the
indicator. The indicator “HOLD” will be appear in the display.
2. Press the DATA HOLD button to return to normal
operation.
3. Press the DATA HOLD button to last 2 second, the blue back
light function is enabled or disenabled.

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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.
MAX/MIN BUTTON
The meter displays the maximum or minimum value of input in the
Max/Min mode. When Max/Min is pressed for the first time, the meter
displays the maximum value. The meter displays the minimum value
when it is pressed again. When Max/Min is pressed for the third time,
the meter displays current value. The meter returns to normal
operation when Max/Min is pressed and held for longer than one
second. Press HOLD key in Max/Min mode makes the meter stop
updating the maximum or the minimum value.

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LOW BATTERY INDICATION
When the icon appears alone in the display ,
the battery should be replaced.
Maintenance
WARNING: To avoid electric shock, disconnect the test leads from
any source of voltage before removing the back cover or the battery
or fuse covers.
WARNING: To avoid electric shock, do not operate your meter until
the battery and fuse covers are in place and fastened securely.
This MultiMeter is designed to provide years of dependable service, if
the following care instructions are performed:
1.KEEP THE METER DRY. If it gets wet, wipe it off.
2.USE AND STORE THE METER IN NORMAL TEMPERATURES.
Temperature extremes can shorten the life of the electronic parts
and distort or melt plastic parts.
3.HANDLE THE METER GENTLY AND CAREFULLY. Dropping it
can damage the electronic parts or the case.
4.KEEP THE METER CLEAN. Wipe the case occasionally with a
damp cloth. DO NOT use chemicals, cleaning solvents, or
detergents.
5.USE ONLY FRESH BATTERIES OF THE RECOMMENDED
SIZE AND TYPE. Remove old or weak batteries so they do not
leak and damage the unit.
6.IF THE METER IS TO BE STORED FOR A LONG PERIOD OF
TIME, the batteries should be removed to prevent damage to the
unit.

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BATTERY INSTALLATION
WARNING: To avoid electric shock, disconnect the test leads from
any source of voltage before removing the battery cover.
1.Turn power off and disconnect the test leads from the meter.
2.Open the rear battery cover by removing two screws (B) using a
Phillips head screwdriver.
3.Insert the battery into battery holder, observing the correct polarity.
4.Put the battery cover back in place. Secure with the screws.
WARNING: To avoid electric shock, do not operate the meter until
the battery cover is in place and fastened securely.
NOTE: If your meter does not work properly, check the fuses and
batteries to make sure that they are still good and that they are
properly inserted.

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Specifications
DC Voltage (VDC)
Range
Resolution
Accuracy
400.0mV
0.1mV
+1.0% of rdg + 4 digits
4.000V
1mV
40.00V
10mV
400.0V
100mV
1000V
1V
+1.2% of rdg + 4 digits
Input Impedance: 10MΩ.
Maximum Input: 1000V dc or 750V ac rms.
AC Voltage (VAC)
Range
Resolution
Accuracy
4.000V
1mV
+1.2%of rdg + 6digits
40.00V
10mV
400.0V
100mV
750V
1V
+1.5%of rdg + 6 digits
All AC voltage ranges are specified from 5% of range to 100%
of range
Input Impedance: 10MΩ.
AC Response: 50 Hz to 400Hz
Maximum Input: 1000V dc or 750V ac rms.
DC Voltage (VDC-AC)
Range
Resol
ution
Accuracy
0-400.0mV
0.1m
V
+1.0% of rdg + 4 digits
4.000V
1mV
40.00V
10mV
400.0V
100m
V

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1000V
1V
+1.2% of rdg + 4 digits
Input Impedance: 10MΩ.
Maximum Input: 1000V dc or 750V ac rms.
AC Voltage (VDC-AC)
Range
Resol
ution
Accuracy
0.15V-4.000V
1mV
+1.0%of rdg + 6digits
40.00V
10mV
400.0V
100m
V
750V
1V
+1.2%of rdg + 6 digits
All AC voltage ranges are specified from 5% of range to 100%
of range
Input Impedance: 10MΩ.
AC Response: 50 Hz to 400Hz
Maximum Input: 1000V dc or 750V ac rms.
DC Current (Auto-ranging)
Range
Resolution
Accuracy
400.0uA
0.1uA
+1.0% of rdg + 5digits
4000uA
1uA
40.00mA
10uA
400.0mA
100uA
+1.2% of rdg + 5digits
10A
10mA
+1.8% of rdg + 5digits
Overload Protection: FF500mA / 1000V and F10A / 1000V
Fuse.
Maximum Input: 4000uA dc on uA range
500mA dc on mA range
10A dc on 10A range.

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AC Current (Auto-ranging)
Range
Resolution
Accuracy
400.0uA
0.1uA
+1.2% of rdg + 6 digits
4000uA
1uA
40.00mA
10uA
400.0mA
100uA
+1.5% of rdg + 6digits
10A
10mA
+2.0% of rdg + 6 digits
All AC Current ranges are specified from 5% of range to 100%
of range
Overload Protection: FF500mA/1000V and F10A/1000V Fuse.
AC Response: 50 Hz to 400 Hz
Maximum Input: 4000uA ac rms on uA
500mA ac rms on mA
10A ac rms on 10Arange
Resistance [Ω] (Auto-ranging)
Range
Resolution
Accuracy
400.0Ω
0.1Ω
+1.2% of rdg + 4 digits
4.000kΩ
1Ω
+1.2% of rdg + 2 digits
40.00kΩ
10Ω
400.0kΩ
100Ω
4.000MΩ
1kΩ
+1.5% of rdg +8digits
40.00MΩ
10kΩ
Input Protection: 1000V dc or 750V ac rms.
Capacitance (Auto-ranging)
Range
Resolution
Accuracy
40.00nF
10pF
+5.0% of rdg + 20 dgts
400.0nF
0.1nF
+3.0% of rdg + 5 dgts
4.000uF
1nF
40.00uF
10nF
400.0uF
0.1uF
4000uF
1 uF
+5.0% of rdg + 10 dgts
Input Protection: 1000V dc or 750V ac rms.

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Frequency (Auto-ranging)
Range
Resolution
Accuracy
9.999Hz
0.001Hz
+1.2% of rdg + 3 dgts
99.99 Hz
0.01Hz
999.9 Hz
0.1Hz
9.999KHz
1 Hz
99.99kHz
10Hz
999.9kHz
100Hz
9.999MHz
1kHz
+1.5% of rdg + 4 dgts
Sensitivity: >0.5V RMS while ≤1MHz ;
Sensitivity: >3V RMS while >1MHz ;
Input Protection: 1000V dc or 750V ac rms.
Diode Test
Test current
Resolution
Accuracy
0.3mA typica
1 mV
+10% of rdg + 5
digits
Open circuit voltage: MAX. 2V dc
Overload protection: 1000V dc or 750V Ac rms.
Audible continuity
Audible threshold: Less than 30Ω Test current MAX. 0.3mA
Overload protection: 1000V dc or 750V Ac rms.