Uniks M8 User manual

M8
TRMS Digital
Multimeter
User Manual

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Overview ...........................................................................4
Safety lnformation ............................................................4
Safety Signs ......................................................................4
Precautions for Use ..........................................................4
1. Appearance ..................................................................5
1.1Description of the instrument.......................................6
1.2 Description of LCD Symbol.........................................7
2. Technical specification ................................................7
3. How to Use ..................................................................9
3.1 Precautions for operation:.......................................9
3.2 DC voltage measurement.........................................9
3.3 AC voltage measurement.......................................10
3.4 Direct current measurement..................................10
3.5 Resistance measurement:.....................................10
3.6 Diode measurement ...............................................11
3.7 Continuity circuit measurement............................11
3.8 Non-contact voltage measurement.......................11
4. Maintenance ..............................................................12
5. Replacement of Battery and Fuse ...........................12
5.1 Replacement of battery..........................................12
5.2 Replacement of fuse...............................................12
6. General Specification .......................................13
7. List of Accessories ...........................................14
8. WARRANTY CONDITIONS ..............................14
9. ASSISTANCE....................................................15

4
Overview
This instrument adopts a LCD monitor with backlight, so that the values can be
clearly read even at a dark piace.lt is a compact handheld digital multimeter (4000
counts) with high performance and reliability. lt uses integrate circuit and A/D
converter as the core, equipped with overload protection circuit. lt can be used to
measure AC/DC voltage, DC current, resistance, diode and continuity tests, which
is regarded as an ideal tool for laboratories, factories and electronicsenthusiasts.
Safety lnformation
This digital multimeter is designed in accordance with IEC61010-1CAT lll 600V
and Pollution Grade 2.
Please read the instructions carefully far the purpose of correct and safe use of
the instrument.
Safety Signs
Important safety information; refer to the
instruction manual.
Danger of high voltage.
Unrecyclable.
The fuse must be replaced according to the
specifications specified in the instructions.
Precautions for Use
1. The instrument can only be used together with the test pen provided, which
meet the requirements of safety standards.The test pen that is damaged or
needs to be changed must be replaced with a test pen of the same model or
specification.
2. The input limits specified for each range shallnot be exceeded.
3. Theunused input ends shallnot be touched when the meter is measured.
4. The function range switch shall be set to the maximum range when the

5
measured range is unknown in size.Keep the test pen from the circuit
under test before the function range is switched.
5. Power off the circuit and discharge all the capacitors before in-circuit resistance
measuring.
6. Please be careful not to put your fingers beyond the hand-blocking part of the test
pen when measuring voltage over 60VDC or 30VAC.
7. Please note that the high voltage pulse in the circuit may damage the internal circuit
of the instrument when measuring a TV set or switching power supply, so keep
careful in operation.
8. lt can't be used in any environment where high concentration of flammable dust or
flammable gas exists, inorder toprevent the electronic components from generating
electric sparks that ignite the dust and gas or lead to explosion in some rare cases.
1. Appearance
1
2
3
4
5

6
1.1Description of the instrument
LCD screen:7-segment LCD monitor with 4000 counts and the function of analog
bar indication.
Button area:
Power button:
Press the button once topower on and press it again to power off.
(lt will automatically power offafter 15-minute no-operation because it
has an auto sleep function.)
Backlight button:
Press the button to turn on the backlight and press it again toturn
off. (Note: The backlight is not bright enough in case of 1ow battery).
Flashlight button:
Press the button to enable the flashlight function and press it again
to turn off. (Note:The flashlight is not bright enough in case of low
battery).
Data hold button:
After press the button in the measurement,the last readings and
the symbol HOLD will be shown on the instrument; press the button
again,and it will return to the normal measurement state.
Jack area
10A jack:
Positive input end for400mA-10A current measurement (connected to
the red probe).
COM jack:
Common input endfor allmeasurements (connected
to the black probe).
Jack V:
Positive input end for voltage,resistance, diode, buzzer,current
measurement within 400mA (connected to the red probe).
NCV inducing area
Function range switch:
Used for selection of functions and ranges.
-W-
01})

7
1.2 Description of LCD Symbol
Auto power-off
Danger of high voltage
Diode measurement
On-off measurement
NCV measurement
Data hold
Battery under voltage
AC voltage/current
DC voltage/current
2. Technical specification
Degree of accuracy: % of reading numbers; the warranty period is 1 year from
the date of delivery.
Ambient temperature: 18°C-28°C.Ambient humidity: <80%.
DC Voltage
Range
Resolution
Degree of accuracy
400mV
100µV
±(0.8% +2digits)
4V
1mV
±(0.8% +2digits)
40V
10mV
±(0.8% +2digits)
400V
100 mV
±(0.8% +2digits)
600V
1V
±(1.0% +2digits)

8
DC Current
Range
Resolution
Degree of accuracy
400µA
0.1 µ A
±(1.0% +2 digits)
4mA
1 µ A
±(1.0% +2 digits)
40mA
10 µ A
±(1.5% +2 digits)
400mA
10 µ A
±(1.5% +2 digits)
10A
10mA
±(3.0% +2digits)
Overload protection: F400mA/250V fuse; F10A/250V fuse.
AC Voltage
Range
Resolution
Degree of accuracy
40V
10mV
±(1.2% +10digits)
400V
100mV
±(1.2% +10digits)
600V
1V
±(1.2% +10digits)
Frequency range:40Hz-400Hz. Display: average value (RMS value of sine wave).
Resistance
Range
Resolution
Degree of accuracy
400Ω
0.1Ω
±(0.8% +3 digits)
4KΩ
1Ω
±(0.8% +3 digits)
40KΩ
10Ω
±(0.8% +3 digits)
400KΩ
100Ω
±(0.8% +3 digits)
4MΩ
1KΩ
±(1.0% +3digits)
Maximum open circuit voltage: 1.2V Overload protection: PTC 600V DC orAC
RMS value.
Diode and Continuity
Function
The on resistance is about less than 50Ω,and the
buzzer is buzzing in theinstrument.
The approximate forward voltage value of diode is displayed.
Maximum open circuit voltage: 2.1V

9
lf the measured voltage range is unknown in advance, please the function range
switch to the maximum,and then reduce it gradually far a satisfactory resolution.
The testpen should keep away from the circuit under test before the function
Please do net input voltage higher than 600V that may damage theinternal
circuit
of the instrument.
Please pay special attention to avoid electric shock whenmeasuring high voltage.
3. How to Use
3.1 Precautions for operation:
1. Power on and check whether the battery ìs under voltage or not. lf the symbol
isdisplayed,the batteryneeds to be replaced; otherwise,please follow the
following steps.
2.The warning symbol next to the test pen jack indicates that the input voltage
or current should not exceed the indicated value, in order to protect the internal
circuit from damage.
3. Set the function range switch as needed before testing.
4. The instrument has an auto power-off function. lt will automatically shut down
after about 15-minute no-operation. Canee! the auto power-off function: Press the
Hold button to turn on, then the warning tane "Di! Di!" will be heard from the
buzzer far several times,and the symbol is not displayed on theLCD
screen. lt can prevent the instrument from the dormant state in the
measurement process.
5. Thebacklight function willautomatic turnoff about 15 seconds after
being turnedon. Pleasepress the button again ifneeded.
6. Theflashlight function will automatically turnoff about 20 seconds after being
turned on. Please press the button again if needed.
3.2 DC voltage measurement
1. insert the redprobe into the jack and the blackprobe into the
jack "COM".
2. Set the function range switch to the range andconnect the test pen to the
power supply or load to be measured.The polarity and measured value of the
end connected with the red probe will be displayed on the screen
simultaneously.
Attention

10
3.3 AC voltage measurement
1. insert the red probe into the jack and the black probe into thejack"COM"
2. Set the function range switch to the range andconnect the test pen to the
power supply or load to be measured. The measured value will be displayed
on the screen.
Note: See the precautions far DC voltage measurement 1, 2,3, 4and 5.
3.4 Direct current measurement
1. Insert the probe into the jack "COM". insert the red probe into the jack
when the measured current does not exceed 400mA. Insert the red probe into
the 10A jack when the measured current is between 400mA and 10A.
2. Set the functional range switch to the required range and connect the test
pen to the load under test in series. The polarity andcurrent value of the end
connected with the red probe will be displayed on the screen
simultaneously.
3.5 Resistance measurement:
1. Insert the probes into the jack "COM" and the red probe into the jack
2. Set the function range switch to the required range, connect the probe to the
resistance under test, and read the measurement results on the screen.
If themeasured current range is unknown in advance, please the
function range switch to the maximum, and then reduce it
gradually far a satisfactory resolution.
The test pen should keep away from the circuit under test
before the function range is switched.
Themonitor that only displays OL indicates an overrange
state, and thefunction range switch should be set to a higher
range.
4. The symbol next to the jack of the test pen indicates that
the maximum input current of 400mA or 10Adepends on the jack
used. Excessive current will burn out the fuse.
Attention