Sonel CMM-10 User manual

OPERATING MANUAL
AUTORANGING MULTIMETER
CMM-10
Version 1.7

2
Multimeter CMM-10 has been designed for the purpose of
measurements of AC/DC voltage, AC/DC current, resistance,
capacitance, frequency, duty cycle, temperature and also for testing
diodes and continuity.
The most important features of CMM-10 are:
•automatic or manual regulation of the measurement range,
•DATA HOLD function, which facilitates readings of
measurements in the case of insufficient lighting or in
inaccessible places,
•REL function, which allows you to make measurements relative
to a stored reference value,
•circuit continuity sound signalling,
•the function of automatic switching of the meter into the standby
mode in order to prolong the durability of batteries,
•3 7/8 digits display (5000 counts).

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1
INTRODUCTION...................................................5
2
SAFETY...................................................................6
3
PREPARATION OF THE METER FOR
OPERATION .................................................................... 7
4
FUNCTIONAL DESCRIPTION............................9
4.1
MEASUREMENT SOCKETS AND ELEMENTS OF SELECTION OF THE
MEASUREMENT FUNCTION....................................................................9
4.1.1
Sockets..............................................................................10
4.1.2
Elements of selection of the measurement function...........10
4.2
LCD DISPLAY...........................................................................11
4.3
TEST LEADS..............................................................................11
5
INTERNATIONAL SAFETY SYMBOLS..........12
6
MEASUREMENTS...............................................12
6.1
DC VOLTAGE MEASUREMENTS.................................................12
6.2
AC VOLTAGE MEASUREMENTS.................................................13
6.3
DC CURRENT MEASUREMENTS.................................................14
6.4
AC CURRENT MEASUREMENTS.................................................15
6.5
RESISTANCE MEASUREMENTS ..................................................16
6.6
CONTINUITY MEASUREMENTS .................................................16
6.7
DIODE MEASUREMENTS...........................................................17
6.8
CAPACITANCE MEASUREMENTS ...............................................18
6.9
FREQUENCY OR %DUTY CYCLE MEASUREMENTS ....................18
6.10
TEMPERATURE MEASUREMENTS ..............................................18
7
SPECIAL FUNCTIONS.......................................19
7.1
AUTORANGING/MANUAL RANGE SELECTION............................19
7.2
RELATIVE MODE.......................................................................19
7.3
DATA HOLD FUNCTION .........................................................20
7.4
DISPLAY BACKLIGHT................................................................20
8
BATTERY REPLACEMENT.............................. 20
9
THE FUSES REPLACEMENT........................... 22
10
CLEANING AND MAINTENANCE ..................22
11
STORAGE .............................................................23

4
12
DISMANTLING AND UTILIZATION ..............24
13
ATTACHMENTS..................................................24
13.1
TECHNICAL DATA.....................................................................24
13.2
STANDARD EQUIPMENT............................................................27
13.3
MANUFACTURER......................................................................27

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1 Introduction
The CMM-10 meter is a modern, high-quality measuring device,
which is easy and safe to use. Please acquaint yourself with the
present manual in order to avoid measuring errors and prevent
possible problems related to operation of the meter.
In the present manual we apply three kinds of warnings. These
are texts in frames, which describe possible dangers both for the
user and the meter itself. The messages starting from the word
‘WARNING:’ describe situations which imply a risk for life or health
should the recommendations presented in the present manual not
be observed. The word ‘CAUTION!’ introduces a description of a
situation where non-observance of the recommendations presented
in the present manual may imply damage for the meter. Indications
of possible problems are preceded by the word ‘Note:’.
WARNING:
The purpose of the CMM-10 meter is to realise
measurements of AC/DC voltage, AC/DC current, resistance,
capacitance, frequency, duty cycle, diode test, continuity
and temperature. Using the meter in a manner which does
not comply with the recommendations specified in the
present manual may lead to its damage and constitutes a
source of a serious risk for the user.
WARNING:
The CMM-10 meter may be operated solely by qualified and
properly authorised personnel for work at electric
installations. Using the meter by unauthorised personnel
may lead to its damage and constitutes a source of a serious
risk for the user.

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WARNING:
Before using the instrument acquaint yourself with the
present manual and observe the safety regulations and
recommendations specified by the manufacturer.
2 Safety
In order to guarantee proper operation and correctness of the
obtained results it is necessary to observe the following
recommendations:
•Before commencing operation of the meter please acquaint
yourself thoroughly with the present manual,
•The instrument should be operated solely by properly qualified
personnel, who also must be trained regarding the industrial
safety regulations,
•Use great care when making measurements if the voltages are
greater than 30VAC rms or 60VDC. These voltages are
considered a shock hazard,
•Do not exceed the maximum allowable input range of any
function,
•Never ground yourself when taking electrical measurements.
Do not touch exposed metal pipes, outlets, fixtures, etc., which
might be at ground potential. Keep your body isolated from
ground by using dry clothing, rubber shoes, rubber mats, or any
approved insulating material,
•Turn off power to the circuit under test before cutting,
unsoldering, or breaking the circuit. Small amounts of current
can be dangerous,
•When using the probes, keep your fingers behind the finger
guards on the probes,
•If “OL” appears in the display during a measurement, the value
exceeds the range you have selected. Change to a higher ran-
ge,
•It is prohibited to operated the meter:
⇒If it is damaged and completely or partially out of order,
⇒If the insulation of the test leads has been damaged,

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⇒If it has been stored for an excessive period of time in
inadequate conditions (e.g. if it is humid),
•Repairs must be realised solely by an authorised service
workshop.
WARNING:
Do not realise measurements in environments in which there
are inflammable gases. Otherwise operation of the meter
under such conditions may cause sparking and explosion.
CAUTION!
Input Limits
Function Maximum Input
V DC or V AC 600VDC/AC rms
mA AC/DC 500mA 250V fast acting fuse
A AC/DC 10A 250V fast acting fuse
Frequency, resistance,
capacitance, duty cycle, diode
test, continuity 250VDC/AC rms
Temperature 250VDC/AC rms
3 Preparation of the meter for operation
Having purchased the meter examine completeness of the
contents of the package.
Before measurements commence, it is necessary to realise the
following actions:
•Make sure the conditions of the batteries or accumulators
permit to realise measurements,
•Make sure the casing of the meter and the insulation of the test
leads are not damaged,

8
•Insert the black test lead into the negative COM terminal and
the red test lead into the other positive terminal,
•ALWAYS turn the function switch to the OFF position when the
meter is not in use. This meter has Auto OFF that automatically
shuts the meter OFF if 30 minutes elapse between uses.
WARNING:
Connection of inappropriate or damaged test leads
constitutes a risk of an electric shock with a dangerous
voltage.
Note:
On some low AC and DC voltage ranges, with the test leads
not connected to a device, the display may show a random,
changing reading. This is normal and is caused by the high-
input sensitivity. The reading will stabilize and give a proper
measurement when connected to a circuit.

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4 Functional description
4.1 Measurement sockets and elements of
selection of the measurement function
CMM-10

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4.1.1 Sockets
3 measurement socket 10A
Measurement socket for the purpose of measurements of
direct current up to 10A.
4 measurement socket COM
Measurement socket common for all the measurement
functions.
5 measurement socket VΩTEMPHz%mAµA
Measurement socket for all the measurement functions
except of 10A current measurements.
4.1.2 Elements of selection of the measurement function
1 5000 count Liquid Crystal Display with symbolic signs
2 Rotational selector
Selection of function:
•Temp – Celsius or Fahrenheit temperature measurement
•Hz% – frequency and duty cycle measurement
•ΩCAP –resistance, capacitance and continuity
measurement and diode testing
•V–AC and DC voltage measurement
•OFF – meter off
•10A –AC and DC current measurement up to 10A
•mA –AC and DC current measurement up to 400mA
•µA–AC and DC current measurement up to 400µA
6 MODE button
•Measurement mode selection: Ohm / Diode / Continuity /
Cap, DC / AC, Hz / %Duty
7 RANGE button
•Manual range selection
8 HOLD button
•Data Hold function
•Back Light function

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9 REL button
•Relative measurement function
10 battery compartment lid
4.2 LCD display
– continuity
– battery status
– diode
DC, AC – voltage (current) direct, alternating
ºC – Celsius degrees
ºF – Fahrenheit degrees
AUTO – auto range
REL – relative
HOLD – display hold
4.3 Test leads
The manufacturer guarantees correct measurement indications
provided original test leads are used.
WARNING:
Connection of inadequate test leads constitutes a risk of
electric shock with a dangerous voltage or may be a cause of
measurement errors.

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5 International Safety Symbols
This symbol, adjacent to another symbol or terminal,
indicates the user must refer to the manual for further
information.
This symbol, adjacent to a terminal, indicates that, under
normal use, hazardous voltages may be present
Double insulation
6 Measurements
It is recommended to get acquainted thoroughly with the
contents of the present chapter since it describes the measurement
systems, the manner of realisation of measurements and the basic
principles of interpretation of the results.
6.1 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.
In order to realise a measurement of DC voltage, it is necessary
to realise the following actions:
•Set the function switch to the Vposition,
•With the RANGE button set the measurement range manually
if necessary,
•Insert the black test lead banana plug into the negative COM
jack. Insert the red test lead banana plug into the positive
VΩTEMPHz%mAµAjack,
•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,

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•Read the voltage in the display.
6.2 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.
WARNING:
Risk of Electrocution. The probe tips may not be long
enough to contact the live parts inside some 240V outlets for
appliances because the contacts are recessed deep in the
outlets. As a result, the reading may show 0 volts when the
outlet actually has voltage on it. Make sure the probe tips are
touching the metal contacts inside the outlet before
assuming that no voltage is present.
In order to realise a measurement of AC voltage, it is necessary
to realise the following actions:
•Set the function switch to the Vposition,
•With the RANGE button set the measurement range manually
if necessary,
•Insert the black test lead banana plug into the negative COM
jack. Insert the red test lead banana plug into the positive
VΩTEMPHz%mAµAjack,
•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,
•Read the voltage in the display.

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6.3 DC current measurements
WARNING:
To avoid electric shock, do not measure DC
current on any
circuit whose voltage exceeds 250V.
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.
In order to realise a measurement of DC current, it is necessary
to realise the following actions:
•Insert the black test lead banana plug into the negative COM
jack,
•For current measurements up to 4000µA DC, set the function
switch to the µA position and insert the red test lead banana
plug into the VΩTEMPHz%mAµAjack,
•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 VΩTEMPHz%mAµAjack,
•For current measurements up to 20A DC, set the function
switch to the 10A position and insert the red test lead banana
plug into the 10A jack,
•Press the MODE button to indicate “DC” on the display,
•Remove power from the circuit under test, then open up the
circuit at the point where you wish to measure current,
•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,
•Apply power to the circuit,
•Read the current in the display.

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6.4 AC current measurements
WARNING:
To avoid electric shock, do not measure AC current on any
circuit whose voltage exceeds 250V.
CAUTION!
Do not make current measurements on the 10A scale for
longer than 30 seconds. Exceeding 30 seconds may cause
damage to the meter and/or the test leads.
In order to realise a measurement of AC current, it is necessary
to realise the following actions:
•Insert the black test lead banana plug into the negative COM
jack,
•For current measurements up to 4000µA DC, set the function
switch to the µA position and insert the red test lead banana
plug into the VΩTEMPHz%mAµAjack,
•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 VΩTEMPHz%mAµAjack,
•For current measurements up to 20A DC, set the function
switch to the 10A position and insert the red test lead banana
plug into the 10A jack,
•Press the MODE button to indicate “AC” on the display,
•Remove power from the circuit under test, then open up the
circuit at the point where you wish to measure current,
•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,
•Apply power to the circuit,
•Read the current in the display.

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6.5 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.
In order to realise a measurement of the resistance it is
necessary to realise the following actions:
•Set the function switch to the ΩCAP position,
•Insert the black test lead banana plug into the negative COM
jack. Insert the red test lead banana plug into the positive
VΩTEMPHz%mAµAjack,
•Press the MODE button to indicate “Ω
ΩΩ
Ω”on the display,
•With the RANGE button set the measurement range manually
if necessary,
•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,
•Read the resistance in the display.
6.6 Continuity Measurements
WARNING:
To avoid electric shock, never measure continuity on
circuits or wires that have voltage on them.
In order to realise continuity test it is necessary to realise the
following actions:
•Set the function switch to the ΩCAP position,
•Insert the black test lead banana plug into the negative COM
jack. Insert the red test lead banana plug into the positive
VΩTEMPHz%mAµAjack,

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•Press the MODE button to indicate and “Ω
ΩΩ
Ω”on the display,
•Touch the test probe tips to the circuit or wire you wish to
check,
•If the resistance is less than approximately 150Ω, the audible
signal will sound. If the circuit is open, the display will indicate
“OL”,
6.7 Diode Measurements
WARNING:
To avoid electric shock, do not test any diode that has
voltage on it.
In order to realise diode test it is necessary to realise the
following actions:
•Set the function switch to the ΩCAP position,
•Insert the black test lead banana plug into the negative COM
jack. Insert the red test lead banana plug into the positive
VΩTEMPHz%mAµAjack,
•Press the MODE button to indicate and “V” on the display,
•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.
Note:
The value indicated in the display during the diode check is
the forward voltage.

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6.8 Capacitance measurements
WARNING:
To avoid electric shock, disconnect power to the unit under
test and discharge all capacitors before taking any
capacitance.
In order to realise capacitance measurement it is necessary to
realise the following actions:
•Set the rotary function switch to the ΩCAP position,
•Insert the black test lead banana plug into the negative COM
jack. Insert the red test lead banana plug into the positive
VΩTEMPHz%mAµAjack,
•Press the MODE button to indicate “F”,
•Touch the test leads to the capacitor to be tested
,
•Read the capacitance value in the display.
6.9 Frequency or % duty cycle
measurements
In order to realise frequency or % duty cycle measurement it is
necessary to realise the following actions:
•Set the rotary function switch to the Hz/% position,
•Insert the black test lead banana plug into the negative COM
jack. Insert the red test lead banana plug into the positive
VΩTEMPHz%mAµAjack,
•Touch the test probe tips to the circuit under test
,
•Read the frequency on the display,
•Press the MODE button to indicate “%”,
•Read the % duty cycle in the display.
6.10 Temperature measurements
In order to realise temperature measurement it is necessary to
realise the following actions:
•Set the function switch to the Temp position,

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•Insert the temperature probe into the input jacks COM and
VΩTEMPHz%mAµA, making sure to observe the correct
polarity,
•Touch the Temperature Probe head to the part whose
temperature you wish to measure. Keep the probe touching
the part under test until the reading stabilizes (about 30
seconds),
•Read the temperature in the display,
•When setting "Celsius" or "Fahrenheit" into initial state, please
remove the battery cover and slip the "ºC /°F" switch to the
corresponding position.
7 Special functions
7.1 Autoranging/manual range selection
When the meter is first turned on, it automatically goes into
autoranging. 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:
•Press the RANGE key. The “AUTO” display indicator will turn
off,
•Press the RANGE key to step through the available ranges
until you select the range you want,
•Press and hold the RANGE button for 2 seconds to exit the
ManualRanging mode and return to AutoRanging.
7.2 Relative mode
The relative measurement feature allows you to make
measurements relative to a stored reference value. A reference
voltage, current, etc. can be stored and measurements made in
comparison to that value. The displayed value is the difference
between the reference value and the measured value.
In order to realise relative measurement it is necessary to
realise the following actions:

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•Perform the measurement as described in the operating
instructions,
•Press the REL button to store the reading in the display and
the "REL" indicator will appear on the display,
•The display will now indicate the difference between the stored
value and the measured value,
•Press the REL button to return to normal operation.
7.3 DATA HOLD function
The Data Hold function allows the meter to "freeze" a
measurement for later reference.
•Press the HOLD button to “freeze” the reading on the
indicator. The indicator “HOLD” will appear in the display,
•Press the HOLD button to return to normal operation.
7.4 Display backlight
Pressing and holding the HOLD button for >1 second
makes the display backlight function turn on or off.
Note
:
The HOLD feature will activate when the backlight is
turned off.
8 Battery replacement
The CMM-10 meter is supplied by means of one 9V battery
type. It is recommended to use alkaline battery.
Attention:
When making measurements with a battery's mnemonic on,
one must take into account additional indefinite
measurement uncertainty or unstable working of the meter.
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1
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