Uniks M12 User manual

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Multifunctional Digital Multimeter
M12
User Manual
V1.0 29.11.2022

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Index
Statement ......................................................................................5
Summary ........................................................................................7
Safety Instructions.........................................................................7
Safety symbol .................................................................................7
Safe operation specifications ........................................................8
1. Instrument instructions ................................................10
2. LCD symbol instructions................................................12
3. Measurement instructions ............................................14
3.1 AC voltage measurement................................................15
3.2 DC voltage measurement................................................16
3.3 mV gear voltage measurement.......................................17
3.4 Resistance/Continuity/diode/capacitance ....................18
3.4 Non-contact electricity verification (NCV) / Live wire
detection (Live).....................................................................19
3.5 Frequency / Duty ratio....................................................21
3.6 uA current .......................................................................22
3.7 mA current......................................................................23
3.8 10A current.....................................................................24
4. General technical index .................................................25
5. Accuracy index ...............................................................26
Instrument maintenance......................................................30
General maintenance............................................................31
Replacement of the battery and fuse tube............................31
6. WARRANTY CONDITIONS ..............................................34
7. ASSISTANCE ....................................................................35

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Statement
According to the Universal Copyright Convention,
without permission and written consent, no content of this
manual may be reproduced in any form (including storage
and retrieval or translation into the languages of other
countries or regions). This manual is subject to change in
future versionswithout extra notice .
Caution
The "caution" sign indicates the condition and
operation that will cause damage to the instrument or
equipment.
It requires that care must be taken when performing
this operation. If it is not performed correctly or this
operation step is not followed, the instrument or equipment
may be damaged. Do not continue to perform any
operation indicated by the caution sign unless these
conditions are met or fully understood.

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Please read the manual carefully and pay
attention to the relevant safety warning
information before using the instrument.

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Summary
This instrument is a compact hand-held 6000 count digital
multimeter with high performance and high reliability. It is
equipped with overload protection circuit, which can be used to
measure AC and DC voltage and current, resistance, diode, circuit
connectivity test, non-contact electricity verification and live wire
detection. AC voltage is also equipped with VFD low-pass filter, can
be used to measure inverter voltage, filter attenuation
-0,94dB@1kHz
Safety Instructions
This instrument is designed and produced in strict accordance
with the Safety Standard IEC61010, and meets the safety standard
of Overvoltage Standard 600V CAT III and Pollution level 2.
Please use the instrument as this manual, otherwise the
protection function provided by the instrument may be reduced or
invalid.
Safety symbol
Please refer to the instructions for important
safetyinformation,
AC high voltage danger
Non-recyclable
The fuse must be replaced according to the
designated specification in the manual.

Safe operation specifications
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Safe operation specifications
Warning
To avoid possible electric shock or physical injury, please
comply with the following specifications:
• Before using the instrument, please read the manual
carefully and use the instrument in strict accordance with
it, otherwise the protection provided by the instrument
may be reduced or invalid.
• Check the shell before using the instrument. Check
whether there is crack or plastic part defect. Please
carefully check the insulator near the input terminal. If
the instrument works abnormally or is damaged, do not
use it.
• It is forbidden to touch live conductors whose voltage
exceeds 30V RMS AC, 42 V AC peak or 60V DC.
• The instrument should be used according to the specified
measurement category, voltage or current rating.
• When the indication of insufficient battery power is
displayed, please replace the battery in time to prevent
measurement errors.
• Please comply with local and national safety
specifications. Wear personal protective
equipment(approved rubber gloves, masks, flame
retardant clothing, etc.) to prevent injury caused by
electric shock and arc when dangerous live conductors
are exposed.
• Do not use the HOLD function to measure unknown voltage.
After HOLD is turned on, the display screen will not change
when different voltages are measured.
• Measure a known voltage to determine whether the
instrument operates normally.

Safe operation specifications
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• When measuring, the correct function and range gear must
be used.
• Do not use the instrument around explosive gas and steam
or in humid environment.
• Do not use damaged probes. Check whether the
insulation of the probe is damaged, whether there is
exposed metal or signs of wear. Check the continuity of
the probes.
• When measuring, please connect the neutral wire or ground
wire first, and then the live wire; when disconnecting,
please cut off the live wire first, and then disconnect the
neutral wire and ground wire.
• When measuring, please hold your fingers behind the probe
finger protector.
• Please disconnect the probe from the measured object
before opening the back cover of the instrument.
• Do not use the instrument in an environment that
exceeds the measurement category (CAT) rating of the
lowest rated single element in the instrument, probe or
accessories.

Instrument instructions
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1. Instrument instructions
①. LCD display ：
It is with 4 digit 7-segment nixie tube display, 6000 counts, and
analog bar indication function.
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3
5
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Instrument instructions
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②. Key area ：
Function selection key ：
Briefly press the key to switch gear function, and long press the
key for about 2 seconds to turn on or turn off VFD low-pass filter.
Attention: VFD low-pass filter only works at AC voltage gear ( ).
Maximum and minimum value key ：
Briefly press the key to start the maximum or minimum value
measurement, and long press the key for about 2 seconds to exit
the maximum or minimum value measurement.
Relative value measurement / Lighting key ：
Briefly press the key to turn on or turn off the relative
value measurement, and long press the key for about 2 seconds to
turn on or turn off the light.
Data retention / LCD backlight key ：
Briefly press the key to turn on or turn off the data retention
display, and long press the key for about 2 seconds to turn on or
turn off the LCD backlight.
③ . Input jack area ：
jack ：
The positive input terminal of 10A current measurement
(connected with the red probe).
jack ：
Common input terminal for voltage, resistance, diode, capacitance,
connectivity and current measurement (connected with the black
probe).

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jack ：
Positive input terminal for voltage, resistance, diode, capacitance,
connectivity, live wire detection, current measurement within
600mA (connected with the red probe).
④ . NCV sensing area
It is used for non-contact voltage verification.
⑤ . Function rotary switch:
It is used to select the measurement function.
2. LCD symbol instructions

LCD symbol instructions
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Automatic shutdown indicator
Capacitance unit
Diode measurement indicator
Current unit
Connectivity measurement
indicator
Voltage unit
AC indicator
Data display area
Data minus indicator
Display retention key
DC indicator
Analog bar indication
VFD low pass filter indicator
Battery low voltage
indicator
Relative measurement indicator
Contact live wire
electricity verification
indicator
Positive duty ratio percentage
indicator
Non-contact electricity
verification
indicator
Frequency gear
Minimum value
indicator
Invalid symbol
Maximum value
indicator
Resistance unit
AC high voltage
indication

Measurement instructions
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3. Measurement instructions
Precautions before operation:
1. Turn on the power and check whether the battery is under
voltage. If " " is displayed on the screen, you need to replace
the battery before operation. If not, please follow the steps
below.
2. The " " warning symbol next to the jack of the measurement
probe indicates that the input voltage or current should not
exceed the indicated value, which is to protect the internal circuit
of the instrument from damage.
3. The instrument has the function of automatic shutdown, that is,
the display shows " " and itwill shut down automatically about
10 minutes after no operation. Cancel the automatic shutdown
function: press and hold the " " key to start the machine,
after hearing the beep sound for about 5 times, release the key,
and the " " is not displayed on the display screen, which can
prevent the instrument from entering the sleep state during the
measurementprocess.
4. The backlight function turns off automatically after about 15
seconds.
5. The lighting function will turn off automatically about 15 seconds
after it is turned on.

Measurement instructions
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3.1 AC voltage measurement
1. Insert the red probe into the " " jack and the black probe
into the jack.
2. Turn the knob switch to the " " position, and connect the probe
to the power supply or load to be measured, and the measured
value will be displayed on the screen.
3. Press " " key to switch frequency and duty ratio, and long
press it to turn on or turn off VFD function.
Attention ：
1. Before turning the function rotary switch, leave the
measurement probe from the circuit under measurement.
2. When the screen only displays "OL", it means that the range
has been exceeded and the measurement should be
terminated.
3. Do not input AC voltage with effective value higher than 600V,
otherwise there is a risk of damaging the instrument.
4. Pay special attention to avoid electric shock when measuring
high voltage.

Measurement instructions
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3.2 DC voltage measurement
1. Insert the red probe into the " " jack and the black probe
into the jack.
2. Turn the knob switch to the " " position,and connectthe probe
to the power supply or load to be measured. The polarity and
measured value of the contact terminal of the red probe will be
displayed on the screen.
Attention ：
1. Before turning the function rotary switch, leave the
measurement probe from the circuit under measurement.
2. When the screen only displays "OL", it means that the range
has been exceeded and the measurement should be
terminated.
3. Do not input AC voltage with effective value higher than
600V, otherwise there is a risk of damaging the instrument.
4. Pay special attention to avoid electric shock when measuring
high voltage.

Measurement instructions
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3.3 mV voltage measurement
1. Insert the red probe into the " " jack and the black probe into
the jack.
2. Turn the knob switch to the " " position, and connect the probe
to the power supply or load to be measured. The polarity and
measured value of the contact terminal of the red probe will be
displayed on the screen.
3. Press the key to switch DC voltage, AC voltage and
frequency measurement.
Attention
：
1. Before turning the function rotary switch, leave the
measurement probe from the circuit under measurement.
2. When the screen only displays "OL", it means that the range
has been exceeded and the measurement should be
terminated.
3. Do not input AC voltage with effective value higher than 600V,
otherwise there is a risk of damaging the instrument .
4. Pay special attention to avoid electric shock when measuring
high voltage.

Measurement instructions
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3.4Resistance/Continuity/diode/capacitance measurement
1. Insert the red probe into the " " jack and the black probe
into the jack.
2. Turn the knob switch to the " " position and press the
key to switch the measurement of resistance, connectivity, diode
and capacitance.
3. Connect the probe to the measured object and read the
measurement result from the display.
Attention ：
1. Before turning the function rotary switch, leave the
measurement probe from the circuit under measurement.
2. When the screen only displays "OL", it means that the range
has been exceeded and the measurement should be
terminated.
3. Do not input AC voltage with effective value higher than 600V,
otherwise there is a risk of damaging the instrument.
4. When measuring large capacitance, discharge the
capacitance before measuring.

Measurement instructions
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3.5 Non-contact electricity verification (NCV) / Live wire
detection (Live)
1. Turn the knob switch to the " " position and press the
key to switch NCV or Live function.
2. Under the NCV function, place the NCV sensing area close
to the wire to be measured. When the AC voltage is
detected, the buzzer will make an intermittent sound,
which varies with the intensity of the induced voltage.
Meanwhile, the number of " " is displayed on the
display screen. The more the number, the stronger the
induced signal.
3. Under the Live function, insert the red probe into the "
"jack, and the black probe is not connected.
Connect the red probe to the cable to be measured.
When the detected electric AC voltage is greater than
about 36V, the buzzer will emit intermittent sound,
which varies with the intensity of the induced voltage.
Meanwhile, the number of " " is displayed on the
display screen. The more the number, the stronger the
induced signal.
Note: NCV mode can also connect the probe in Live
mode to judge the live wire, but the sensitivity will be
higher than that in Live mode.

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NCV Live
Warning ：
1. Measurement range: about 36V~600V, 50Hz or 60Hz.
2. When using, even if there is no sound or display prompt,
the wire to be measured may still have voltage. The
instrument may be affected by other factors (such as
shielded wires and cables, thickness of insulation layer,
distance from voltage source, diversity in socket design,
etc.), and fail to sense the electric field.
3. When judging the live wire, do not put your fingers or
conductors into the COM jack, otherwise there may be a
risk of electric shock.