Axio MET AX-380 User manual
AX-380
1. General feature
It is a 3 3/4-bit digital clamp meter of automatic range conversion and a high-reliability digital clamp
multimeter with stable performance and driven by battery. It adopts 16mm font height LCD display of
clear readings. With the functions of data retention and automatic power-off, it is more convenient to use.
data retention and automatic power-off, it is more convenient to use. This meter can be used to measure
such parameters as DCV, ACV, DCA, ACA, resistance, capacity, frequency, diode, continuity, etc. Cen-
tered on the dual slope A/D conversion of large-scale integrated circuit, the whole set has the function of
automatic range conversion and thus is a meter with excellent performance and a desirable tool for labs,
factories, radio fans and homes.
Warning: Before use, please read carefully the information under “Safety Notices”.
2. Unpacking Check
After unpacking, please carefully check if the following items are missing or damaged. If so, please contact
the distributor immediately.
Digital clamp multimeter - 1 set
User’s manual - 1 piece
Test leads - 1 set
9V battery NEDA1604/6F22 - 1 piece
3. Safety Notices
Please note warning mark “ ” and the sentence titled with “Warning”, which represent the circumstances
or actions that endanger the user, may cause damages to the clamp multimeter or the tested equipment.
This meter is designed and produced strictly in accordance with the safety requirements of GB4793 elec-
tronic measuring meters and IEC61010-1 and IEC1010-2-032 Safety Standards and conforms to the safety
standards of double insulation and over-voltage CAT III 600V and Grade II pollution. Before use, please
read this manual carefully.
• Be cautious against electric shock, when measuring the voltage above 30VAC, AC electric line with
inductive loads, and AC electric lines during electric fluctuation.
• Before measurement, check that the function switch is at the proper position, check if the test probe
touches the measured item reliably, if there is proper connection, good insulation etc, in order to avoid
electric shock.
• The clamp multimeter cannot conform to the requirements of the related safety standards until it is
used together with the attached test probe. If the test probe cable is broken, it must be replaced with
the cable of the same type or the same electric specifications.
• Replace the battery with only the battery of the same type and the same voltage specification. Before
replacing the test probe, keep it away from the measured point and make sure there are no signals on
the input end.
• During voltage measurements, never directly touch the ground or bare metal terminals, output ports,
lead clamps, etc that may have ground potential.
• Do NOT store or use the meter in high temperature environments, high humidity, high flammability,
high explosion potential or strong magnetic field.
• Measuring the voltage above the allowed limit voltage will damage the meter and endanger the
operator. The allowed limit voltage is marked on the panel of the meter.
• Do not attempt to calibrate or repair this meter. Calibration and repair must be conducted only by
specially trained personnel or qualified professional technician.
• During measurement, the function/range selection switch must be placed at the correct range function.
When converting the function/range selection switch, be sure to disconnect the test probe cable from
the tested item and make sure there are no signals input in the input end. Never convert the
function/range selection switch during measurement!
• When the LCD display shows “ ”, please replace the battery in order to ensure testing accuracy.
• Do not change any circuit parts in the meter without permission from the manufacturer in order to
prevent damage to this unit.
4. Common Electric Symbols
Safety rules
Earth ground
AC or DC
DC Current
AC Current
High voltage! Danger!
Double Insulated
Low Battery
Fuse
Conforms to Standards of European Union
5. External Structure
1. Clamp head
2. Label
3. Clamp head trigger
4. Range knob
6-1. Manual selecting key
6-2. DCA Reset button
6-3. ACV/DCV selecting key,relative measurement key, frequency duty cycle selecting key
6-4. Data hold key
7. LCD display
8. VΩ input hole: the input terminal of measuring voltage,resistance,capacitance,diode and continu-
ity.insert the red test leads.
9. COM input hole:negative input terminal,insert the black test leads
6. Symbols Display
1. AC signal measurement indicate
2. DC signal measurement indicate
3. Automatic range indicate
4. Relative value measurement indicate
5. Data hold indicate
6. Low battery indicate
7. Diode measurement indicate
8. Continuous measurement
9. Duty cycle measurement indicate
10. Current measurement unit (A,mA, uA), Voltage measurement unit (V, mV, uV), Capacity measurement
unit (nF, uF)
11.Resistance measurement unit (, k, M)
7. Functions of Keys and Automatic Power-off
• SELECT: Selects functions in the trigger mode. When two or more measurement functions are
combined at the same position, press this key to switch between the functions
• HOLD: Holds readings in the trigger mode. Press this key to lock the displayed value and press it
again to reset the locking state and then enter the normal measurement state
• REL: Measures relative values in the trigger mode. Press this key at the DCA position to set as
reference the currently displayed value and automatically reset the LCD display. In the subsequent
measuring results, the reference value will be automatically deducted until the relative value
measurement function is exited by pressing this key again.
• Automatic power-off function: The meter will automatically “Power Off” after idling for 15 minutes.
To reset, press any function key (for effective key operations, see VIII) or rotate the function/range
selection button, then the meter will automatically “Power On” and enter the measurement status. To
power off the meter, hold the SELECT key, then the automatic power-off function will be cancelled.
“Auto Power-off” represents a sleep status. In such state, a small amount of current (approximately
5μA) will be consumed. If the meter is not used for long, be sure to shut off its power.
• Buzzer Function: Press any function key at any position; if such key is valid, the buzzer will sound; if
invalid, the buzzer will not sound; the buzzer will give 5 continuous warning sounds for 1 minute and
then 1 long buzz sound just before it powers off. The buzzer sounds at the continuity measurement
when the resistance is less than 50.
• Effectiveness of Keys - Not all key operations are effective at all positions. Only the correct key
operation can change the operation function or wake up the sleeping clamp multimeter. See the
following table for details ( �means effective):
Note
The capacitance gear has relative value measurement function.
8. Features
8.1. General feature
• Display mode: LCD display
• Max. display: 3999 (3 3/4) bit auto polar display or unit display
• Measurement mode: Dual slope A/D conversion
• Conversion rate: 3 times/s
• Over-range display: “OL” displayed in the highest
• Low battery display: “ ” occurs on the upper part of the LCD
• Auto power-off function
• Max. head opening size: dia. 55mm
• Max. size of predicted current lead: dia. 50mm
• Effect of electromagnetic field: If used for devices nearby electromagnetic field, unstable or incorrect
readings may be displayed
• Error caused by test position: When measuring current, please place the source to be tested in the
center of the clamp head; otherwise, certain additional error will occur
• Operating environment: (0~40)°C RH<80%
• Storage environment: -10~50°C, RH<80%
• Power supply: 9V battery NEDA1604/6F22
• Volume (dimensions): 275mm×96mm×50mm (L×W×H)
• Approx. 565g (battery included)
8.2. Technical
8.2.1. DC voltage measurement
• Turn the function/range SELECT switch V gear, press the “SELECT”key to choose the desired DCV.
• Respectively insert the red test probe and black test probe into the “VΩ” and “COM” ends.
• Simultaneously connect the test probe cable onto the tested circuit or the power supply, then the
polarity of the red test probe cable and the tested voltage value will be shown on the screen.
• Read the currently measured result from the display.
DCV Technical Indicators:
1 - Range
2 - Accuracy
3- Resolution
Input resistance: 10M. Overload protection: 1000V DC or 750V AC peak value.
8.2.2. AC Voltage Measurement
• Turn the function/range SELECT switch gear. Press the SELECT key to choose the desired ACV.
• When measure “mV”range,should press “RANGE”to choose “mV” range.(when the measured value is
above 1.5V,the meter is into protection mode ,if continue to measure should restart the power.)
• Respectively insert the red test probe and black test probe into the “V” and “COM” ends.
• Simultaneously connect the test probe cable onto the tested circuit or the power supply, then the
polarity of the red test probe cable and the tested voltage value will be shown on the display.
• Read the currently measured result from the display.
ACV Technical Indicators:
1 - Range
2 - Accuracy
3- Resolution
Input resistance: 10M. Frequency response: 40~400Hz. Display: Mean value response(Sine virtual value).
Overload protection :1000V DC or 750V AC peak value.
Note
• Do not measure the DCV above 1000V or ACV above 750V.
• When high voltage is measured, be sure to avoid electric shock. After measurement, immediately
disconnect the test probe and the tested circuit.
8.2.3. Resistance measurement
• Turn the function/range SELECT switch “Ω ” gear.
• Respectively insert the red test probe and black test probe into the V and COM ends.
• Connect the test probe cables to the tested resistor as shown, so the resistance value displays on the
LCD .
Note
• At 200Ω range,it should make the test leads short to measure the wire resistance,then ,subtracts from
the real measurement.
• If the tested resistor is open or its resistance is out of the max. range of the clamp multimeter, it will
show “OL”.
• Do not input any voltage when measure resistance.
Resistance (Ω)Technical Indicators:
1 - Range
2 - Accuracy
3- Resolution
Open voltage: 400mV. Overload protection: 250V DC or AC peak value.
8.2.4. Diodes and Continuity Measurement
8.2.4.1. Diode test
• Turn the function/range SELECT switch “Ω ” gear. Press the SELECT key to choose the desired
diode measurement mode.
• Insert the red test probe and black test probe into the respected “VΩ” and “COM” ends.
• Connect the red test probe to the positive of the diode and the black test probe to the negative.
• Read the currently measured result from the display.
Note
• In case of open diode or reverse polarity, the display will show “OL”.
• When the online diode is measured, be sure to shut off the line power supply and discharge all
capacitors completely.
• After the measurement is over, immediately disconnect the test probe and the tested circuit.
8.2.4.2. Continuity test
• Turn the function/range SELECT switch “Ω ” gear.
• Press the SELECT key to choose the desired continuity measurement function.
• Insert the red test probe and black test probe into the respected “V” and “COM” ends.
• Simultaneously connect the test probes to both ends of the tested circuit as shown.
• If the resistance between both ends of the circuit is less than about 50Ω, the built-in buzzer will sound.
Technical Indicators of Diode Measurement and Continuity Test:
Range - Resolution - Description
Diode - 1mV - Open voltage approx. 1.5V; Forward voltage drop approx. 0.5~0.8V
Continuity - Test 0.1Ω - Open voltage approx.0.45V; when less than 50Ω, the buzzer will sound.
Overload protection: 250V DC or AC peak value.
Note
• If the tested circuit is open, the display will show “OL”.
• In case of line continuity test, be sure to shut off the line power supply and discharge all capacitors.
• After the measurement is over, immediately disconnect the test probe and the tested circuit.
8.2.5. Capacitance measurement
• Turn the function/range SELECT switch capacitance range. Insert the red test probe and black test
probe into the respected “VΩHz” and “COM” ends.
• Simultaneously connect the test probe cables to the tested capacitor so the capacitance value will show
on the LCD.
• If the LCD display “OL”,it means over range, you should set the knob to a higher range.
• Read the measured result from the LCD.
Capacitance (C) Technical Indicators:
1 - Range
2 - Accuracy
3- Resolution
Overload protection: 250V DC or AC peak value.
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