Axio MET AX-18B Manuel utilisateur
AX-18B
INSTRUCTION
2
Contents
1. General instructions ............................................................................................ 3
1.1. Precautions safety measures ............................................................................... 3
1.2. Protection mechanisms ..................................................................................... 5
2. Description ...................................................................................................... 6
2.1. Instrument Familiarization ................................................................................. 6
2.2. LCD Display .................................................................................................... 6
2.3. eypad ......................................................................................................... 7
3. Function description ........................................................................................... 8
3.1. General Functions ............................................................................................ 8
3.2. Measurement Functions ..................................................................................... 8
4. Technical specifications ..................................................................................... 14
4.1. General specifications ..................................................................................... 14
4.2. Measurement specifications .............................................................................. 14
5. Maintenance ................................................................................................... 17
5.1. General Maintenance ...................................................................................... 17
5.2. Fuse replacement ........................................................................................... 18
5.3. Battery replacement........................................................................................ 18
6. Accessories ..................................................................................................... 19
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1. General instructions
This instrument complies with IEC 1010-1 (61010-1@IEC: 2001), CAT. II 1000V and CAT. III 600V
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 1.1.3
1.1 Precautions safety easures
1.1.1 Preli inary
•Measurement category III is for measurements performed in the building installation.
NOTE: Examples are measurements on distribution boards, circuit-breakers, wiring, including
cables, bus-bars, junction boxes, switches, socket-outlets in the fixed installation, and equipment
for industrial use and some other equipment, for example, stationary motors with permanent
connection to the fixed installation.
•Measurement category II is for measurements performed on circuits directly connected to the low
voltage installation.
NOTE: Examples are measurements on household appliances, portable tools and similar equipment.
•Measurement category I is for measurements performed on circuits not directly connected to
MAINS.
NOTE: Examples are measurements on circuits not derived from MAINS, and specially protected
(internal) MAINS derived circuits. In the latter case, transient stresses are variable; for that reason,
requires that the transient withstand capability of the equipment is made known to the user.
•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.
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.
4
•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 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 600V in Category III, or 1000V in Category II installations.
•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.
1.1.3 Sy bols:
Symbols used in this manual and on the instrument:
5
1.1.4 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 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.
1.2 Protection echanis s
This instrument is fitted with various protection mechanisms:
•Varistor protection for limiting transients of over 1000V at the VΩ terminal.
•A PTC (positive temperature coefficient) resistor protects against permanent overvoltages of up to
1000V during resistance, capacitance, temperature, continuity and diode test measurements.
~
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
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2. Description
2.1 Instru ent Fa iliarization
1) LCD display
2) eypad
3) Rotary switch
4) Terminals
5) Battery cover
2.2 LCD Display
1) Indicator for AC voltage or current
2) Indicates negative readings
3) Indicator for DC voltage or current
4) The meter is in the Autorange mode in which the meter automatically selects the range with the
best resolution.
5) The Meter is in the data transmission mode
6) The meter is in Diode Test mode.
7) The meter is in Continuity Check mode.
7
8) The meter is in Data Hold mode.
9) The meter is in Relative Measurement mode.
10) Display maximum data
11) Display minimum data
12) Low battery indication (Note: When this symbol appears, it means that the battery needs to be
replaced.)
13) Measurement units
14) This symbol means that the input is too large for the selected range.
2.3 Keypad
2.3.1 SELECT
I. At Ω
ΩΩ
Ω position
Switches between Resistance measurement, Diode Test and Continuity check.
II. At A A µ
µµ
µA position
Switches between dc and ac current.
III. Power-up Option
Disables automatic power-off feature.
2.3.2 HOLD/LIGHT
Press it to enter and exit the Data Hold mode. Press it and hold 2 seconds, backlight on; if press it
and hold for seconds again, backlight off.
2.3.3 RANGE
At V~, V , Ω, A, mA and µA.
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.
2.3.4 EL
Press REL to enter and exit the Relative measurement mode. (Except Hz/DUTY)
2.3.5 MAX/MIN
This key is for measuring maximum value and minimum value. (Except Hz/Duty, Capacitance)
1) Press it to enter Max/Min mode.
2) Press it again; the LCD will display the Maximum Value.
3) Press it again; the LCD will display the Minimum Value.
4) Press and hold it for two seconds, the meter will return to normal measurement state.
8
3. Function description
3.1 General Functions
3.1.1 DATA HOLD ode
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/LIGHT key again.
To enter and exit the Data Hold mode:
1) Press HOLD/LIGHT key (short press). Fixes the display on the current value, H is displayed.
2) A second short press returns the meter to normal mode.
3.1.2 Manual ranging and Autorange ode
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.
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.
2) NOTE: If you manually chan e the measurement ran e after enterin the Data Hold modes,
the Meter exits this mode.
3) 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 Battery Saver
The Meter enters the "sleep mode" and blanks the display if the Meter is on but not used for
30 minutes.
Press the HOLD /LIGHT key or rotate the rotary switch to wake the meter up.
To disable the Sleep mode, hold down the SELECT key while turning the meter on.
3.1.4 Relative easure ent ode
The Meter will display relative measurement in all functions except frequency.
- 11 -
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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 key to store the measured value and activate the relative measurement mode.
The difference between the reference value and subsequent reading is displayed.
3) Press REL key for more than 2 seconds to return the Meter to normal operation.
3.2 Measure ent Functions
3.2.1 AC and DC Voltage easure ent
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.
The Meter's voltage ranges are 600.0mV, 6.000V, 60.00V, 600.0V and 1000V. (AC 600.0mV range
only exists in manual ranging mode).
To measure ac or dc voltage:
1) Set rotary switch to the DCV, ACV or DCmV range.
2) Connect the black and red test leads to the COM and V terminals respectively.
3) Connect the test leads to the circuit being measured
4) Read the displayed value. The polarity of red test lead connection will be indicated when
making a DCV measurement.
NOTE:
Unstable display may occur especially at 600mV range, even though you do not put test leads into
input terminals, in this case, if an erroneous reading is suspected, short the V terminal and the
COM terminal, and make sure the zero display.
For better accuracy when measuring the dc offset of an ac voltage, measure the ac voltage first.
Note the ac voltage range, then manually select a dc voltage range equal to or higher than the ac
range. This improves the accuracy of the dc measurement by ensuring that the input protection
circuits are not activated.
3.2.2 Resistance easure ent
To avoid electrical shock and/or damage to the instrument, disconn
ect circuit
power and discharge all high voltage capacitors before measuring resistance.
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The Meter's resistance ranges are 600.0Ω, 6.000kΩ, 60.00kΩ, 600.0kΩ, 6.000MΩ and 60.00MΩ.
To measure resistance:
1) Set the rotary switch to Ω
ΩΩ
Ω range.
2) Connect the black and red test leads to the COM and VΩ terminals respectively.
3) Connect the test leads to the circuit being measured and read the displayed value.
Some tips for measuring resistance:
The measured value of a resistor in a circuit is often different from the resistor's rated value.
This is because the Meter's test current flows through all possible paths between the probe tips.
In order to ensure the best accuracy in measurement of low resistance, short the test leads before
measurement and memory the test probe resistance in mind. This necessary to subtract for the
resistance of the test leads.
The resistance function can produce enough voltage to forward-bias silicon diode or transistor
junctions, causing them to conduct. To avoid this, do not use the 60MΩ range for in-circuit
resistance measurements.
On 60MΩ range, the meter may take a few seconds to stabilize reading. This is normal for high
resistance measuring.
When the input is not connected, i.e. at open circuit, the figure "OL" will be displayed for the
overrange condition.
3.2.3 Diode Test
To avoid electrical shock and/or damage to the instrument, disconnect circuit
power and discharge all high voltage capacitors before testing diodes.
To test a diode out of a circuit
1) Set the rotary switch to Ω
ΩΩ
Ω range.
2) Press the SELECT key once to activate Diode Test.
3) Connect the black and red test leads to the COM and VΩ terminals respectively.
4) For forward-bias readings on any semiconductor component, place the red test lead on the
component's anode and place the black test lead on the component's cathode.
5) The meter will show the approx. forward voltage of the diode.
In a circuit, a good diode should still produce a forward bias reading of 0.5V to 0.8V; however,
the reverse-bias reading can vary depending on the resistance of other pathways between the
probe tips.
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