Aktakom AM-1142 User manual

Contents
TITLE PAGE
1. GENERAL INSTRUCTIONS …………………………………………………………….. 1
1.1 Precaution safety measures …………………………………………………………….. 1
1.1.1 Preliminary …………………………………………………………….. 1
1.1.2 During use …………………………………………………………….. 3
1.2 Symbols …………………………………………………………….. 4
1.3 Instructions …………………………………………………………….. 4
2. DESCRIPTION …………………………………………………………….. 6
2.1 Instrument Familiarization …………………………………………………………….. 6
2.2 LCD Display …………………………………………………………….. 7
2.3 Key pad …………………………………………………………….. 9
3. FUNCTION DESCRIPTION …………………………………………………………….. 11
3.1 General Functions …………………………………………………………….. 11
3.1.1 DATA HOLD mode …………………………………………………………….. 11
3.1.2 Manual ranging and Autorange mode …………………………………………………………….. 11
3.1.3 True RMS measurement …………………………………………………………….. 12
3.1.4 Relative measurement mode …………………………………………………………….. 12
3.1.5 Analog indication bar …………………………………………………………….. 12
3.1.6 Auto power off setting …………………………………………………………….. 13
3.2 Measurement Functions …………………………………………………………….. 14
3.2.1 AC and DC Voltage measurement …………………………………………………………….. 14
3.2.2 Resistance measurement …………………………………………………………….. 15

TITLE PAGE
3.2.3 Diode Test …………………………………………………………….. 16
3.2.4 Continuity Check …………………………………………………………….. 17
3.2.5 Capacitance measurement …………………………………………………………….. 18
3.2.6 Frequency measurement …………………………………………………………….. 19
3.2.7 Current measurement …………………………………………………………….. 20
3.2.8 Temperature measurement …………………………………………………………….. 21
3.2.9 PC Link …………………………………………………………….. 21
4. TECHNICAL SPECIFICATIONS …………………………………………………………….. 22
4.1 General specifications.. …………………………………………………………….. 22
4.2 Measurement specifications …………………………………………………………….. 23
4.2.1 AC Voltage …………………………………………………………….. 23
4.2.2 DC Voltage …………………………………………………………….. 24
4.2.3 Frequency …………………………………………………………….. 24
4.2.4 Duty cycle …………………………………………………………….. 25
4.2.5 Resistance …………………………………………………………….. 25
4.2.6 Diode Test …………………………………………………………….. 25
4.2.7 Continuity Check …………………………………………………………….. 26
4.2.8 Capacitance …………………………………………………………….. 26
4.2.9 Temperature …………………………………………………………….. 26
4.2.10 Current …………………………………………………………….. 27
5. MAINTENANCE …………………………………………………………….. 28

TITLE PAGE
5.1 General maintenance …………………………………………………………….. 28
5.2 Fuse replacement …………………………………………………………….. 28
5.3 Battery replacement …………………………………………………………….. 29
6. ACCESSORIES …………………………………………………………….. 29

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1. GENERAL INSTRUCTIONS
This instrument complies with IEC 61010-1˖2001, CAT ċ1000V and CAT Ď600V overvoltage standards. See
Specifications.
To get the best service from this instrument, read carefully this user's manual and respect the detailed safety
precautions.
International symbols used on the Meter and in this manual are explained in chapter 1.2.
1.1 Precautions safety measures
1.1.1 Preliminary
* As the possibilities of high transient overvoltages occurred in today’s power systems increase, more stringent safety
standards are set for the electrical test equipment. Transients on electrical systems(power grid, feeder or branch
circuits) will trigger a series of incidents that may result in serious personal injury. To protect you against transients,
safty must be built into the test equipment.

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Overvoltage
category In brief Examples
CATĉElectronic
• Protected electronic equipment.
• Equipment connected to (source) circuits in which measures are taken
to limit transient overvoltages to an appropriately low level.
• Any high-voltage, low-energy source derived from a highwinding
resistance transformer, such as the high-voltage section of a copier.
CATĊ
Single-phase
receptacle
connected loads
• Appliance, portable tools, and other household and similar loads.
• Outlet and long branch circuits.
• Outlets at more than 10 meters (30 feet) from CAT III source.
• Outlets at more that 20 meters (60 feet) from CAT IV source.
CAT ċ
Three-phase
distribution,
including
single-phase
commercial lighting
• Equipment in fixed installations, such as switchgear and polyphase
motors.
• Bus and feeder in industrial plants.
• Feeders and short branch circuits, distribution panel devices.
• Lighting systems in larger buildings.
• Appliance outlets with short connections to service entrance.
CAT Ď
Three-phase at
utility connection,
any outdoor
conductors
• Refers to the “origin of installation”; i.e., where low-voltage connection is
made to utility power.
• Electricity meters, primary overcurrent protection equipment.
• Outside and service entrance, service drop from pole to building, run
between meter and panel.
• Overhead line to detached building, underground line to well pump.
* When using this Multimeter, the user must observe all normal safety rules concerning:
 protection against the dangers of electric current.
 protection of the Multimeter against misuse.
* For your own safety, only use the test probes supplied with the instrument. Before use, check that they are in good
condition.

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1.1.2 During use
* If the meter is used near noise generating equipment, be aware that display may become unstable or indicate large
errors.
* Do not use the meter or test leads if they look damaged.
* Use the meter only as specified in this manual; otherwise, the protection provided by the meter may be impaired.
* Use extreme caution when working around bare conductors or bus bars.
* Do not operate the meter around explosive gas, vapor, or dust.
* Verify a Meter's operation by measuring a known voltage. Do not use the Meter if it operates abnormally. Protection
may be impaired. When in doubt, have the Meter serviced.
* Uses the proper terminals, function, and range for your measurements.
* When the range of the value to be measured is unknown, check that the range initially set on the multimeter is the
highest possible or, wherever possible, choose the autoranging mode.
* To avoid damages to the instrument, do not exceed the maximum limits of the input values shown in the technical
specification tables.
* When the multimeter is linked to measurement circuits, do not touch unused terminals.
* Caution when working with voltages above 60Vdc or 30Vac rms. Such voltages pose a shock hazard.
* When using the probes, keep your fingers behind the finger guards.
* When making connections, connect the common test lead before connecting the live test lead; when disconnecting,
disconnect the live test lead before disconnecting the common test lead.
* Before changing functions, disconnect the test leads from the circuit under test.
* For all dc functions, including manual or auto-ranging, to avoid the risk of shock due to possible improper reading,
verify the presence of any ac voltages by first using the ac function. Then select a dc voltage range equal to or
greater than the ac range.
* Disconnect circuits power and discharge all high-voltage capacitors before testing resistance, continuity, diodes, or
capacitance.
* Never perform resistance or continuity measurements on live circuits.
* Before measuring current, check the meter's fuse and turn off power to the circuit before connecting the meter to
the circuit.
* In TV repair work, or when carrying out measurements on power switching circuits, remember that high amplitude

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voltage pulses at the test points can damage the multimeter. Use of a TV filter will attenuate any such pulses.
* Use just one 6F22 battery, properly installed in the Meter's battery case, to power the Meter.
* Replace the battery as soon as the battery indicator ( ) appears. With a low battery, the Meter might produce false
readings that can lead to electric shock and personal injury.
* Do not measure voltages above 1000V in Category III, or 600V in Category Činstallations.
* When in REL mode, the “REL” symbol is displayed. Caution must be used because hazardous voltage may be
present.
* Do not operate the Meter with the case (or part of the case) removed.
1.2 Symbols:
Symbols used in this manual and on the instrument:
Caution:refer to the instruction manual. Incorrect use may result in damage to the device or its
components.
~ AC (Alternating Current)
DC (Direct Current)
AC or DC
Earth ground
Double insulated
Fuse
Conforms to European Union directives
1.3 Instructions
* Remove test leads from the Meter before opening the Meter case or battery cover.
* When servicing the Meter, use only specified replacement parts.
* Before opening up the instrument, always disconnect from all sources of electric current and make sure you are
not charged with static electricity, which may destroy internal components.
* Any adjustment, maintenance or repair work carried out on the meter while it is live should be carried out only by

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appropriately qualified personnel, after having taken into account the instructions in this present manual.
* A "qualified person" is someone who is familiar with the installation, construction and operation of the equipment
and the hazards involved. He is trained and authorized to energize and de-energize circuits and equipment in
accordance with established practices.
* When the instrument is opened up, remember that some internal capacitors can retain a dangerous potential even
after the instrument is switched off.
* If any faults or abnormalities are observed, take the instrument out of service and ensure that it cannot be used
until it has been checked out.
* If the meter is not going to be used for a long time, take out the battery and do not store the meter in high
temperature or high humidity environment.

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2. DESCRIPTION
2.1 Instrument Familiarization
COM
A
VHz
mA
uA
A
mA
uA
C
¡£
Hz
V
OFF
F
¡£
1
2
3
4
5
67
8
Figure 2-1
The front panel is shown as in Figure 2-1,
explanation being as follows:
ƻ,1 LCD display
Used for displaying the measuring results
and various symbols.
ƻ,2 Keypad
Measurement function keys.
ƻ,3 Rotary switch
Used for selecting measurement functions.
ƻ,4
VHz
Terminal receiving the red test lead for voltage,
resistance, capacitance, frequency, Temperature,
diode and continuity measurements.
ƻ,5 uA/mA
Terminal receiving the red test lead for PA, mA
measurements.
ƻ,6 A
Terminal receiving the red test lead for 10A
measurements.
ƻ,7 COM
Terminal receiving the black test lead as a common
reference.
ƻ,8 PC-Link interface

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2.2 LCD Display
1
2
3
4
18
5
6
810
9
7
19
11 12
13
14
15
16
17
Figure 2-2

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LCD screen is shown as in Figure 2-2, with its every symbol’s meaning shown as in the Table 1:
No. Symbol Meaning
1 Indicator for auto power off
2 Indicator for DC voltage or current
3 Indicates negative readings
4 Indicator for AC voltage or current
5 PC-LINK The Meter is in the data transmission mode.
6 AUTO The meter is in the Autorange mode in which the meter automatically selects
the range with the best resolution.
7 MANU The meter is in the Manual Range mode in which the user selects the range.
8 MAX MIN Display maximum/ minimum data
9 H The meter is in Data Hold mode. When delay-hold is selected, the HOLD
symbol will be blinking for 6 seconds.
10 REL The meter is in Relative Measurement mode.
11 P-MAX P-MIN Indicating the display value being the PEAK maximum value,the PEAK
minimum value. (Only the true RMS+PEAK meter)
12
The sub-display usually shows sub-measurement mode or some special
reading.
13 Low battery indication
14 The meter is in Continuity Check mode.
15 The meter is in Diode Test mode.

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Tabel1 (continue)
No. Symbol Meaning
16
ć
mVA
nmF
MK
:
Hz
Measurement units
17 The second function is enabled.
18 Analog bar, indicating the measurement value with a graphic mode
19
The main-display for the meter’s measurement value, showing all the
measurement values
2.3 Keypad
2.3.1 SELECT
1. At
:
position
Switches between Resistance measurement, Diode Test and Continuity check.
2. At Vposition
Switches between dc and ac voltage.
3. At C
¡
£
F
¡position
Switches between ćand .
4. At A mA
P
Aposition
Switches between dc and ac current.
2.3.2 RANGE

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At V, Hz, ,:, A, mA and PA.
1. Press RANGE to enter the manual ranging mode.
2. Press RANGE to step through the ranges available for the selected function.
3. Press and hold RANGE for 2 seconds to return to autoranging.
2.3.3 REL
Ƹ
1. Press REL
Ƹ
to enter the Relative measurement mode. The sub-display will show the value measured at the
time when pressing the key(it is called the initial value), and the main-display shows the relative value that will be
equivalent to the present value minus the initial value. By pressing the key again the relative measurement state
will be exited. (Except Hz/Duty)
2. Power-up Option
Disables automatic power-off feature.
2.3.4 HOLD
1. Press it to enter the Data Hold mode. Used to maintain the measurement data unchanging, by pressing the
key again it will exit the Data Hold mode.
2. Pressing this key and last for 2 seconds,the meter will delay for 6 seconds,than enters HOLD mode.
3. Powering on the meter while pressing HOLD and lasts 2 seconds turns on all LCD segments until HOLD is
pressed again.
2.3.5 MAX/MIN
This key is for measuring maximum value and minimum value.
1. Press it to enter Max/Min mode. The main-display always shows the current value, and the sub-display shows
the Maximum Value.
2. Press it again; the sub-display will show the Minimum Value.
3. Press and hold it for two seconds, the meter will return to normal measurement state. (Except Hz/Duty)
2.3.6
1. Press this key and last for 2 seconds, backlight on; press it again, backlight off.
2. Press the key and the ‘SHIFT’ symbol will be displayed on LCD. Then press the RANGE key to enter into the

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PC-LINK mode. Repeat it to exit PC-LINK mode.
3. When input AC signal, press SHIFT key and the ‘SHIFT’ symbol will show on LCD. Then press the MAX/MIN
key to enter peak mode. The main-display always shows current value of signal, and the sub-display shows
PMAX value. Repeat it to show PMIN value. To exit peak mode, after press SHIFT key, press MAXMIN key
larger than 1 seconds.(Only the true RMS+PEAK meter)
3. FUNCTION DESCRIPTION
3.1 General Functions
3.1.1 DATA HOLD mode
Data Hold mode makes the meter stop updating the display. Enabling Data Hold function in autorange mode makes
the meter switch to Manual ranging mode, but the full-scale range remains the same. Data Hold function can be
cancelled by changing the measurement mode, pressing RANGE key, or push HOLD key again.
To enter and exit the Data Hold mode:
1. Press HOLD key (short press). Fixes the display on the current value, His displayed.
2. A second short press returns the meter to normal mode.
3.1.2 Manual ranging and Autorange mode
The Meter has both manual ranging and autorange options.
* In the autorange mode, the Meter selects the best range for the input detected. This allows you to switch test
points without having to reset the range.
* In the manual ranging mode, you select the range. This allows you to override autorange and lock the meter in a
specific range.
* The Meter defaults to the autorange mode in measurement functions that have more than one range. When the
Meter is in the autorange mode, AUTO is displayed.

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To enter and exit the manual range mode:
1. Press RANGE key. The Meter enters the manual ranging mode. AUTO turns off. Each presses of RANGE key
increments the range. When the highest range is reached, the Meter wraps to the lowest range.
NOTE: If you manually change the measurement range after entering the Data Hold modes, the Meter exits this
mode.
2. To exit the manual ranging mode, press and hold down RANGE key for two seconds. The Meter returns to the
autorange mode and AUTO is displayed.
3.1.3 TRUE RMS measurement
All the measurement values of the true RMS meter and true RMS+PEAK meter on the AC voltage and AC current
are true root-mean-square values. The basic meter can only measure the AC average value.
3.1.4 Relative measurement mode
The Meter will display relative measurement in all functions except frequency.
To enter and exit the relative measurement mode:
1. With the Meter in the desired function, touch the test leads to the circuit on which you want future measurement to
be based.
2. Press REL
Ƹ
key to store the measured value and activate the relative measurement mode. The difference
between the reference value and subsequent reading is displayed on the sub-display. The main-display always
displays the current value.
3. Press REL
Ƹ
key for more than 2 seconds to return the Meter to normal operation.
3.1.5 Analog indication bar
Analog indication bar is used for graphic measurement value and it always synchronizes with the size of the present
measured value. During the maximum value/minimum value measurement and the relative value measurement it sill
synchronizes with the size of the present measured value, and not indicating the maximum value/minimum value or

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the relative value.
3.1.6 Auto power off setting
1. The Meter enters the "sleep mode" and blanks the display if the Meter is on but not used for 30 minutes.Press any
key or rotate the rotary switch to wake the meter up.
2. To disable the auto power off function, hold down REL
Ƹ
key while turning the meter on. Then the icon will
disappear.
3. When RS232 output is active, the auto power off function is disabled.

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3.2 Measurement Functions
3.2.1 AC and DC Voltage measurement
To avoid electrical shock and/or damage to the
instrument, do not attempt to take any voltage
measurement that might exceeds 1000Vdc or
1000Vac rms.
To avoid electrical shock and/or damage to the
instrument, do not apply more than 1000Vdc or
1000Vac rms between the common terminal and the
earth ground.
Voltage is the difference in electrical potential between two
points.
The polarity of ac (alternating current) voltage varies over time;
the polarity of dc (direct current) voltage is constant.
To measure ac or dc voltage (set up and connect the Meter as
shown in Figure 3-1):
Set the rotary switch to the position of
V
.
1 Press SELECT key to select between AC and DC voltage
mode.
2 Connect the black and red test leads to the COM and V
terminals respectively.
3 Connect the test leads tip in parallel with the circuit to be
measured.
4 Read the voltage value on the main-display and read the
frequency of AC signal on the sub-display.
NOTE:
zIn case of probe hanging in the air, the voltage inducted by
the test leads may cause unstable readings on the display
screen, but that will not affect the accuracy of measurement.
COM
A
VHz
mA
uA
A
mA
uA
C
¡£
Hz
V
OFF
F
¡£
V
AC Voltage
COM
A
VHz
mA
uA
A
mA
uA
C
¡£
Hz
V
OFF
F
¡£
DC Voltage
Figure3-1 Measuring AC and DC Voltage

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3.2.2 Frequency and Duty Cycle measurement
Do not measure Frequency on high voltage (>1000V)
to avoid electrical shock hazard and/or damage to the
instrument.
To measure frequency or Duty Cycle(set up and connect the
Meter as shown in Figure 3-2):
1. Set the rotary switch to the Hz range.
2. Insert the black and red test leads into the COM and Hz
input terminals.
3. Connect the test leads tip in parallel with the circuit to be
measured. And don’t touch any electrical conductors.
4. Read the frequency on the main-display and read the
percent of duty cycle on the sub-display.
NOTE:
zIn noisy environment, it is preferable to use shield cable for
measuring small signal
COM
A
VHz
mA
uA
A
mA
uA
C
¡£
Hz
V
OFF
F
¡£
Figure 3-2 Measuring Frequency and Duty
Cycle