Jaycar QM1528 Manuale utente
Operating Instruction for
Autoranging Digital
Multimeter
Please read this manual before switching the unit on.
Important safety information inside.
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Autoranging Digital Multimeter
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Content
1.Safety..........................................................................................
1-1.Safety Instructions.................................................................
1-2.Safety Symbols.......................................................................
1-3.Input Limits............................................................................
2.Description...................................................................................
2-1.Meter Description....................................................................
2-2.Symbols Used on LCD Display..................................................
3.Button Function............................................................................
4.Operation.....................................................................................
4-1.DC Voltage Measurement........................................................
4-2.AC Voltage Measurement.........................................................
4-3.DC Current Measurement.........................................................
4-4.AC Current Measurement.........................................................
4-5.Resistance Measurement........................................................
4-6.Continuity Check.....................................................................
4-7.Diode Test...............................................................................
5.Replacing the Battery...................................................................
6.Replacing the Fuses.....................................................................
7.Specifications..............................................................................
7-1.Technical Specifications..........................................................
7-2.General Specifications.............................................................
4
Autoranging Digital Multimeter
1.Safety
1-1.Safety Instructions
The following safety information must be observed to ensure maximum personal safety during
the operation at this meter:
• Do not use the meter if the meter or test leads look damaged, or if you suspect that the meter is
not operating properly.
• 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.
• Use caution when working above 60V dc or 30V ac rms, such voltages pose a shock hazard.
• When using the probes, keep your fingers behind the finger guards on the probes.
• Measuring voltage which exceeds the limits of the multimeter may damage the meter and expose
the operator to a shock hazard, always recognize the meter voltage limits as stated on the front
of the meter.
•Never apply voltage or current to the meter that exceeds the specified maximum.
1-2.Safety Symbols
This symbol adjacent to another symbol, terminal or operating device indicates that the
operator must refer to an explanation in the Operating Instructions to avoid personal injury
or damage to the meter.
This WARNING symbol indicates a potentially hazardous situation, which if not
avoided, could result in death or serious injury.
This CAUTION symbol indicates a potentially hazardous situation, which if not
avoided, may result damage to the product.
This symbol advises the user that the terminal (s) so marked must not be connected
to a circuit point at which the voltage with respect to earth ground exceeds (in this
case) 600 VAC or VDC.
MAX
WARNING
CAUTION
5
Autoranging Digital Multimeter
This symbol adjacent to one or more terminals identifies them as being associated with ranges
that may, in normal use, be subjected to particularly hazardous voltages.
For maximum safety, the meter and its test leads should not be handled when these terminals
are energized.
1-3.Input Limits
Maximum Input
600V DC/AC
200mA DC/AC
250V DC/AC
Function
VDC or VAC
mA DC/AC
Resistance, Diode Test, Continuity
6
Autoranging Digital Multimeter
2.Description
2-1.Meter Description
1-NCV Indicate Lamp
2-2000 Count Liquid Crystal Display
3-MAX Hold Button
4-MODE Button
5-Function Switch
6-COM Input Jack
7-Positive Input Jack
8-Battery Cover
8
Autoranging
Digital Multimeter
OFF
mA
μA
V
Auto
Power
Off
Ω
V
MODEMAX
COM V Ω mA μA
200mA/600V
CAT III 300V
CAT II 600V
1
2
3 4
5
67
7
Autoranging Digital Multimeter
2-2.Symbols Used on LCD Display
1-Autoranging
2-Diode Test
3-Continuity
4-Maximum
5-Battery Status
3.Button Function
3-1.MODE Button
To select Diode/Continuity or DC/AC current.
3-2.MAX Hold Button
• The max. Hold position is used to measure the maximum value.
• The maximum measured value is up dated continuously.
• To take a Max Hold measurement, press and release the button. To take another
Max Hold reading, press and release the button again.
6-Units of Measure List
7-Measurement Reading
8-Minus Sign
9-Alternating Current
10-Direct Current
1 2 3 4 5
6
7
8
10
9
8
Autoranging Digital Multimeter
4.Operation
WARNING: Risk of electrocution. High-voltage circuits, both AC and DC, are very dangerous and
should be measured with great care.
• 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 15 minutes elapse between uses.
• If “OL” appears in the display during a measurement, the value exceeds the range you have
selected, change to a higher range.
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.
4-1.DC Voltage Measurement
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.
1.Set the function switch to the VDC Position (“mV” will appear in the display).
2.Insert the black test lead banana into the COM Input Jack; Insert the red test lead banana into
the Positive Input Jack.
3.Touch the test probe tips to the circuit under test, be sure to observe the correct polarity (Red lead
to positive, Black lead to negative).
4.Read the voltage in the display.
Autoranging
Digital Multimeter
OFF
mA
μA
V
Auto
Power
Off
Ω
V
MODEMAX
COM V Ω mA μA
200mA/600V
CAT III 300V
CAT II 600V
9
Autoranging Digital Multimeter
4-2.AC Voltage Measurement
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.
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.
1.Set the function switch to the VAC Position.
2.Insert the black test lead banana into the COM Input Jack; Insert the red test lead banana into
the Positive Input Jack.
3.Touch the test probe tips to the circuit under test, be sure to observe the correct polarity (Red lead
to positive, Black lead to negative).
4.Read the voltage in the display.
Autoranging
Digital Multimeter
OFF
mA
μA
V
Auto
Power
Off
Ω
V
MODEMAX
COM V Ω mA μA
200mA/600V
CAT III 300V
CAT II 600V
10
Autoranging Digital Multimeter
4-3.DC Current Measurement
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.
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.
1.For current measurements up to 2000µA DC, set the function switch to the µA Position.
2.For current measurements up to 200mA DC, set the function switch to the mA Position.
3.Insert the black test lead banana into the COM Input Jack; Insert the red test lead banana into
the Positive Input Jack.
4.Press the MODE Button until “DC” appears in the display.
5.Remove power from the circuit under test, then open up the circuit at the point where you wish
to measure current.
6.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.
7.Apply power to the circuit.
8.Read the current in the display
Autoranging
Digital Multimeter
OFF
mA
μA
V
Auto
Power
Off
Ω
V
MODEMAX
COM V Ω mA μA
200mA/600V
CAT III 300V
CAT II 600V
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