Uniks M32 User manual

M32 User Manual (V1.0)
TRMS Digital Multimeter

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Sommario
1. GENERAL INFORMATION ..................................................1
1.1 SAFETY INFORMATION ......................................................... 1
1.1.1 Safety instructions.................................................. 1
1.1.2 Safety considerations ............................................. 1
1.1.3 Safety symbol: ........................................................ 3
1.1.4 Maintenance practices for safety........................... 3
1.2 INPUT PROTECTION MEASURES .............................................. 4
2. A SCHEMATIC DIAGRAM FOR THE METER .........................4
2.1 A SCHEMATIC DIAGRAM FOR THE METER................................ 5
PHYSICAL APPEARANCE........................................................5
2.2 DESCRIPTION OF THE SYMBOLS ON THE DISPLAY UNIT................. 6
2.3 DESCRIPTION OF FUNCTIONAL KEYS........................................ 7
2.4 DESCRIPTION OF INPUT SOCKET ............................................. 8
2.5 ACCESSORIES..................................................................... 9
3. OPERATIONAL GUIDELINES ...............................................9
3.1 NORMAL OPERATION .......................................................... 9
3.1.1 Hold mode.............................................................. 9
3.1.2 Backlight & lighting................................................ 9
3.1.3 Auto power off ..................................................... 10
3.2 MEASUREMENT GUIDELINES ............................................... 10

3.2.1 Measurement of AC voltage and DC voltage ....... 10
3.2.2 Electric resistance measurement ......................... 11
3.2.3 Diode test ............................................................. 12
3.2.4 Beep continuity test ............................................. 13
3.2.5 Capacitance measurement .................................. 13
3.2.6 Frequency measurement...................................... 14
3.2.7 Current measurement .......................................... 14
3.2.8 NCV test (non-contact voltage detection) ............ 15
3.2.9 Measuring temperature....................................... 16
4. TECHNICAL PARAMETERS................................................16
4.1 OVERALL PARAMETERS ...................................................... 16
4.2 PRECISION INDICATOR........................................................ 18
4.2.1 DC voltage............................................................ 18
4.2.2 AC voltage ............................................................ 18
4.2.3 Frequency............................................................. 19
4.2.4 Electric resistance................................................. 19
4.2.5 Diode.................................................................... 20
4.2.6 Beeper continuity ................................................. 20
4.2.7 Capacitor.............................................................. 21
4.2.8 DC current ............................................................ 21
4.2.9 AC current ............................................................ 22
4.2.10 Temperature....................................................... 22

5. METER MAINTENANCE ...................................................23
5.1 GENERAL MAINTENANCE.................................................... 23
5.2 BATTERY & FUSE REPLACEMENT .......................................... 23
6. ASSISTANCE ....................................................................24
6.1 WARRANTY CONDITIONS............................................. 24
6.2 ASSISTANCE ................................................................. 25

M32 TRMS Digital Multimeter
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1. General Information
This digital multimeter is designed and manufactured in
compliance with IEC-61010 safety requirements on electronic
measuring instruments and hand-held digital multi-meters. It is
compliant with IEC-61010 requirements pertaining to 600V CAT IV,
1000V CAT.Ⅲ and requirements on pollution degree 2. Please read
carefully this Operation Manual and pay attention to safety
guidelines before operating this meter.
1.1 Safety information
1.1.1 Safety instructions
* Before operating this meter, the operator must observe all standard
safety procedures in the two respects below:
A. Safety procedures against electric shock
B. Safety procedures against unintended use
* To ensure your personal safety, please use the test lead that
accompanies the meter. Before operating this meter, ensure that the
test lead is flawless.
1.1.2 Safety considerations
* When the meter is used in the vicinity of the equipment that produces
strong electromagnetic interferences, the reading on the meter will
grow unstable and even produce serious errors.
*Don't operate the meter or pen-shaped meter whose appearance is
damaged.
*The safety function of the meter will become null if the meter is not
properly operated.
*The meter must be operated with great care when working in the
vicinity of an exposed conductor or bus line.
*The meter is prohibited from being used in the vicinity of any
explosive gas, vapor or dust.
*The measurement must be made with correct input terminals and

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functions and within the allowable measuring range.
*To prevent the meter from being damaged, the value to be input shall
not exceed the extremes allowed by each measuring range.
* When the meter has already been connected to the line being
measured, the operator is prohibited from touching the input
terminal that is not in service.
*When the voltage measured exceeds 60Vdc or 30Vac (valid value), the
operator shall be careful enough to avoid electric shock.
* When making measurement with a test lead, place your fingers
behind its protective ring.
*When switching to another measuring range, be sure that test lead
has already been taken off the measured circuit.
*For all DC functions, to prevent potential electric shock as a result of
incorrect reading, please first use AC functions to check the absence
of any AV voltage. Then, select DC voltage measuring range
equivalent to or greater than that for AC voltage.
*Before the tests on electric resistance, diode, capacitor or continuity,
the operator must cut off the power supply to the circuit to be
measured, and discharge all high-voltage capacitors within the
circuit to be measured.
* The electric resistance measurement or continuity test cannot be
carried out in any live electrical circuit.
* Before the current measurement, the operator must first examine the
protective tube of the meter. Before connecting the meter to the
circuit to be measured, the operator must first power off the
aforesaid circuit.
* Before repairing TV sets or measuring power switching circuit, the
operator must be careful enough to prevent high amplitude voltage
impulse from damaging the meter.
*This meter uses 4 x 1.5V AA batteries that must be correctly installed
into the battery compartment.
*When appears, the batteries must be replaced immediately. The
low level of a battery will result in incorrect reading on the meter,
which is likely to bring electric shock or personal injury to the
operator.
*In measurement, category III voltage and category IV voltage shall
not exceed 1000V and 600V respectively.

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*The meter shall not be in service if its case (or part of its case) is dismantled.
1.1.3 Safety symbol:
The safety symbols that appear on the meter's body and in this
Operation Manual:
Warning, an important safety symbol. The operator
must consult this Operation Manual before using the
meter. Unintended use may lead to the damage to
the device or its components.
AC (alternating current)
DC (direct current)
AC/DC
Ground
Double insulation protection
Fuse
Compliant with European Union Directive
High voltage warning
CAT. III
1000 V
over-voltage protection
CAT. IV
600 V
over-voltage protection
1.1.4 Maintenance practices for safety
* The operator must first pull out the test lead when the meter's case is
opened or the battery cover is dismantled.
* The designated replacement parts must be used at the moment of
maintenance.

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* The operator must cut off all relevant power supplies before opening
the meter. At the same time, the operator must avoid damage to the
meter's elements by ensure that he himself doesn't carry any static.
* The meter can only be calibrated, repaired and maintained by
professionals.
* When the meter's case is opened, the operator must understand the
fact that the presence of some capacitance may promise the
dangerous voltages even if the power supply to the meter is cut off.
* The operator should stop using and maintain the meter immediately
if any abnormality has been observed on the meter. The operator
must see to it that the meter cannot be in service unless it is proved
conforming.
* When the meter is left idle for a long period, the operator shall
remove the battery and place it in a place free from high temperature
and humidity.
1.2 Input protection measures
* The meter can sustain the maximum input voltage of 1000V (DC) or
750V (AC) at the moment of voltage measurement.
* The meter can sustain the maximum AC voltage of 600V or equivalent
voltage (valid value) when the tests on frequency, electric resistance,
continuity and diode are carried out.
* The protective tube (FF600mA/1000V) is used for protection purpose
when A and mA current measurements are carried out.
2. A Schematic Diagram for the Meter
This meter is a hand-held digital multi-meter with the function of
displaying True RMS. it is a large-screen LCD unit with backlight and
illumination light functions so that the user can easily recognize
reading. It is equipped with the function of overload protection and
the indicator of battery under voltage. Either for professionals,
factories, schools, enthusiasts or households, it is an ideal multi-

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functional meter.
2.1 A Schematic Diagram for the Meter
Physical appearance
①.Non-contact voltage detection area ②. Non-contact voltage indicator
③. LCD screen ④.key ⑤.Rotary switch ⑥.input socket

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2.2 Description of the symbols on the display unit
Fig. 1 (Display panel)
Table.1 (Symbols)
Symbol
Description
Battery Under Voltage indicator/ Low Battery
To avoid electric shock or personal injury as
a result of incorrect reading, promptly replace
the battery when the battery under voltage
indicator appears.
Auto power off indicator
High voltage warning
Negative input polarity indicator
Input voltage AC
Input voltage DC
Continuity test mode
Diode test mode
Automatic range measurement mode
Data hold mode
℃，℉
Unit of temperature(℃: Celsius; ℉: Fahrenheit)
%
Duty ratio
NCV
Non-contact AC voltage detection mode

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Table.1 Symbols (Continued)
V, mV
V:
mV：
V: the unit of volt
Millivolt，1x10-3 or 0.001 volt.
A, mA, A
A:
mA:
A:
Ampere, the unit of current.
Milliampere, 1x10-3 or 0.001
ampere.
Microampere, 1x10-6 or 0.000001
ampere.
, k, M
:
k:
M:
Ohm, the unit of electric resistance.
Kilohm, 1000 Ohm
Megaohm, 1,000,000 ohm.
MkHz
Hz:
KHz:
MHz:
Hz, the unit of frequency
KHz, 1x103Hz.
MHz, 1x106Hz or 1000 KHz.
mF,F, nF
F:
mF:
F:
nF:
Farad, the unit of capacitance.
Millifarad, 1x10-3 or 0.001 farad.
Microfarad, 1x10-6 or 0.000001
farad.
nF, 1x10-9 or 0.000000001 farad.
2.3 Description of functional keys
Key
Description of functions
SEL
SEL keys, e.g.
TEMP position: ℃ mode or ℉ mode.
Voltage position or current position:
ACV/DCV ACA/DCA
：Select the diode or beep on-off mode
HOLD(H)
Press the key to hold the measured value for the
current moment Press the key again to cancel
this function.
Press this key for more than 2 seconds, the

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backlight and the illumination indicator will be
on; however, long press the key for more than 2
seconds again, you will turn off backlight and
illumination indicator. If you don't press the key
at all, the function will automatically be
disenabled in 15 seconds .
HZ／%
AC voltage or AC current position：Under AC
voltage or AC current measuring state, press this
key to select ACV/HZ/% or ACA/HZ/%
measurement mode.
Frequency position ：HZ or % measurement
mode.
2.4 Description of input socket
input
socket
Description
COM
All public input terminals to be measured are
connected to test leads in black or the public
output plugs of exclusive multi-function test
sockets.
℃/℉
VHz%
Positive input terminals (connected to a test lead
in red) for capacitor measurement, diode
measurement, beep on/off test, temperature
measurement, voltage measurement, electric
resistance, frequency, duty ratio.
A mA
A and mA positive input terminal (connected to
a test lead in red).
10A
10A positive input terminal (connected to a test
lead in red).

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2.5 Accessories
Operation Manual
1
Test lead
2
K-Type thermocouple
2
3. Operational guidelines
3.1 Normal operation
3.1.1 Hold mode
In the hold mode, the reading can be maintained on the display
unit. Changing the measurement function position or pressing the
key Hold again to exit the hold mode.
Hold mode: entry and exit
1. Press the key “H” and the reading will be held and the symbol
“ ” will appear on the LCD screen.
2. Press the key “H” again to restore the meter to its status for
normal measurement.
3.1.2 Backlight & lighting
The meter is equipped with the functions of backlight and lighting
so that the operator can access measurement results even if he is in a
darker place. The backlight function can be enabled or disenabled by
the steps below:
1. Long press key for more than 2 seconds to enable backlight
and illumination light.
2. Long press key for more than 2 seconds again to manually
disenable backlight and illumination light; wait for 15 seconds
until the backlight and illumination light are automatically
disabled.

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3.1.3 Auto power off
If no operations are made in 15 minuts following the initialization,
the meter will sound to remind the operator to automatically cut off
power supply and enter the state of dormancy. The meter can be
rebooted when the operator presses H/ key in the auto power off
mode.
3.2 Measurement guidelines
3.2.1 Measurement of AC voltage and DC voltage
To avoid any electric shock and/or damage to the meter,
do not attempt a voltage measurement if the voltage
(valid value) is 1,000V for DC current or 750V for AC
current.
To avoid any electric shock and/or damage to the meter,
don't attempt to impose between any public terminal and
ground any voltage whose valid value is over 1,000V for
DC current or 750V for AC current.
The meter provides DC voltage measuring ranges as follows:
600.0mV, 6.000V, 60.00V, 600.0V and 1000V, and AC voltage
measuring ranges: 6.000V, 60.00V, 600.0V and 750V.
Measurement of AC voltage or DC voltage
1. Turn the rotary switch to the position V，Press "SEL" to switch
DC/AC voltage function.
2. Connect the test lead in black and test lead in red to COM input
socket and V input socket respectively.
3. Use another two ends of the test lead to measure the voltage of
the circuit to be measured. (In parallel connection with the
circuit to be measured)
4. Read the measured voltage value on LCD screen. When DC
voltage measurement is attempted, the display unit will show

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the voltage polarity of the circuit connected to the pen-shaped
meter in red.
Notes:
Within the measuring range of DC voltage of 600mV and AC
voltage of 6V, even if there is no input or no connection to the
test lead, the meter will display some information. In this
situation, press short circuit “V－” and “COM” terminal to
reset the meter to zero.
Within the AC voltage function, press the key " HZ/%" to measure
the frequency of the AC voltage source（40HZ~1KHZ）.
The value of the AC voltage measured with this meter is True RMS
(root mean square). These measurements are accurate for sine wave
and other waves (without DC offset), square wave, triangular wave
and step wave.
3.2.2 Electric resistance measurement
To avoid the meter or the measured equipment from
damage, do not attempt a resistance measurement unless
the operator has already cut off all power sources for the
circuit to be measured and fully discharged all high-voltage
capacitors.
Ohm is the unit of electric resistance ().
The measuring ranges of electric resistance of this meter are 600.0,
6.000k, 60.00k, 600.0k, 6.000Mand 60.00M,
Measurement of electric resistance
1. Turn the rotary switch to the position.
2. Connect the test lead in black and test lead in red to COM input
socket and V/input socket respectively.
3. Use another two ends of the test lead to measure the electric
resistance of the circuit to be measured.
4. Read the measured electric resistance value on LCD screen.
Notes:
The measured value of the electric resistance of the circuit differs a

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bit from the rated value of the electric resistance.
To ensure measurement accuracy, in attempting a low resistance
measurement, first put two pen-shaped meters in short circuit and
capture the resistance reading of these short circuits. Then subtract
the aforesaid reading from the measured resistance.
At 60Mposition, you have to wait a few seconds before the reading
grow stable. This is quite normal for a high resistance measurement.
When the meter is in open circuit, the display unit will show "OL" that
indicates the measured value is over the measuring range.
3.2.3 Diode test
To avoid the meter or the measured equipment from
damage, do not attempt a diode test unless the operator
has already cut off all power sources for the circuit to be
measured and fully discharged all high-voltage capacitors.
Diode test outside the circuit:
1. Turn the rotary switch to the position ，Press "SEL" to
switch or function。
2. Connect the test leads in black and in red to COM input socket
and V/input socket respectively.
3. Connect the test leads in black and in red to the positive and
negative poles of the diode to be tested respectively.
4. The meter displays the forward bias value of the diode to be
tested. If the polarity of the test lead is reversed, the meter will
display "OL".
A normal diode still produces a forward voltage drop of 0.5V to 0.8V;
the reverse bias voltage reading depend on the variation in electric
resistance of other channels between two pen-shaped meters.

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3.2.4 Beep continuity test
To avoid the meter or the measured equipment from
damage, do not attempt a beep continuity test unless the
operator has already cut off all power sources for the circuit
to be measured and fully discharged all high-voltage
capacitors.
Steps for a continuity test:
1. Turn the rotary switch to the position .
2. Connect the test lead in black and test lead in red to COM input
socket and V/input socket respectively.
3. Use another two ends of the test lead to measure the resistance
of the circuit to be measured. If the measured distance is no
more than 40Ω, the sensor LED (green indicator) will be on and
the beeper will sound continuously. If the measured resistance
is between 40and 60Ω, the sensor LED (red indicator) will be
on.
3.2.5 Capacitance measurement
To avoid the meter or the measured equipment from
damage, do not attempt a capacitance measurement unless
the operator has already cut off all power sources for the
circuit to be measured and fully discharged all high-voltage
capacitors. Use the DC voltage position to determine that
all capacitors have been discharged.
The measuring ranges for the capacitance of this meter are 6.000nF,
60.00nF, 600.0nF, 6.000F, 60.00F and 600.0F,6mF,100mF.
Measurement of capacitance:
1. Turn the rotary switch to the position .
2. Connect the test leads in black and in red to COM input socket and
input socket respectively.

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3. Use another two ends of the test lead to measure the capacitance
of the capacitor to be measured, and capture the measured value
on LCD screen.
Notes:
The measurement of a large capacitance requires a given period of
stabilization of reading.
To avoid damage to the meter, the measurement of a capacitor with
polarities requires much attention to its polarity.
3.2.6 Frequency measurement
To avoid any electric shock and/or damage to the meter, do
not attempt a frequency measurement if the voltage is over
250V for DC current or AC current(valid value).
Frequency measurement:
1. Turn the rotary switch to the position HZ%，Press "Hz%" to switch
HZ or % function.
2. Connect the test leads in black and in red to COM input socket
and Hz input socket respectively.
3. Use another two ends of the test lead to measure the frequency
of the circuit to be measured.
4. Read the measured frequency on LCD screen.
3.2.7 Current measurement
Do not attempt a measurement on the current in a circuit,
if when the voltage between the open-circuit voltage and
the ground is over 250V. If the fuse is blown at the moment
of measurement, you are likely to damage the meter or get
yourself hurt.
To avoid any damage to the meter or equipment to be
measured, do not attempt a current measurement unless
you have examined the meter's protective tube. In