Dawson Tools DDM450 User Manual

DIGITAL MULTIMETER

CAT.III

600V

SERVICE

00-05-3842

Thank you for purchasing our product!

As our customers are our top priority and we strive for 100% satisfaction,

we would appreciate your feedback on the product.

Our professional support team is always ready to answer

your enquiries and provide assistance.

Please contact our customer service department at [phone] or at
www.dawsontools.com if you have any questions regarding this product.

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DD M4 50

DDM450

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1.

INTRODUCTION

DDM450 is a stable, safe, reliable compact digital handheld 6000 count
auto-ranging multimeter.

This meter is ideal for many situations, whether you're a professional

or causal user.

This meter can measure AC/DC voltage, AC/DC
current, resistance, continuity, diodes, non-contact voltage, and battery
test.

2.

WARNINGS

Check the meter before use to make sure there was no damage during

transit.

Check that the insulation on the test leads is not damaged and/or wires

are not exposed.

If any faults or abnormalities are observed, the meter should not be used

and should be checked out prior to use.

Never exceed the protection limit values indicated in specifications for

each range of measurement.

Always be careful when working voltages above 60V DC or 30V AC rms,

keep fingers behind the probe barrier while measuring.

Make sure the rotary switch is in the correct position before measurement.
Never use the meter in an environment with explosive gas, vapor or dust.
Always keep fingers behind probe barriers when making measurements.
When connecting test leads to a circuit, connect the black test lead first,

then the red lead. Disconnect in the opposite order.

Turn off power and discharge all capacitors first before measuring

resistance, continuity or diodes.

Failure to follow safety guidelines could compromise the safety features

of this meter.

Do not use the meter without the battery cover in place
Replace the batteries as soon as

“ ” to avoid false reading that could lead to electric shock and injury.

Remove test leads from all circuits before opening the battery cover.

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the low battery symbol appears.

To avoid electric shock and injury or damage to the meter, observe the
following safety methods:

This instrument from Dawson Tools Inc. will be free from defects in
workmanship and material for three years from the date of original
purchase. This warranty does not cover defects resulting from
damage caused by the user such as drops, neglect, misuse,
unauthorized alteration, usage outside of specified conditions,
contamination, or improper repair/maintenance. To receive service
on the instrument if it becomes necessar y during the warranty period,
contact your nearest Dawson authorized ser vice center at
[phone] or visit www.DawsonTools.com to obtain a return
authorization (within the US only). A return authorization is necessary
before returning anyinstr ument to Dawson; no ser vice will be
provided without a retur n authorization. The user is responsible for
properly packing the unit and charges such as shipping, freight and
insurance charges. The extent of Dawson's liability is limited solely
to the repair/replacement of the instrument. The above war ranty in
Its entirety is inclusive and no other warranties, written or oral, are
expressed or implied.

LIMITED WARRANTY AND
LIMITATION OF LIABILITY

Out of the Box

Check the meter and accessories thoroughly before
using the meter. Contact your local distributor if the meter or any
components are damaged or malfunction.

Accessories

• Test leads x1 pair

• User's manual x1

• 9V battery x1

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3.

SAFET Y SYMBOLS

1.LCD Display

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2.Hold

Press “HOLD” to hold the current reading on the display. Press the button
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3.Function Button
Press “FUNC” to switch between functions or between AC/DC current.

Backlight Button

Press “ ” to turn on the

backlight. Press the button again to turn off the backlight.

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6.Rotary Switch

7.Input Jack (all measurements; current below 600mA)

8.A Jack (current measurements between 600mA-10A only)

9.Common Jack (all measurements)

again to return to normal measurement

NCV Button

Hold the “NCV” button down in any mode and the meter will activate the
non-contact voltage detection. Move the top of the meter towards an AC
voltage source and the buzzer will sound and the NCV indicator will light
up if voltage is detected. Release the “NCV” button to stop NCV detection.

Important safety information

AC(alternating current)

DC(direct current)

DC/AC Voltage or Current

Double insulation protection

Fuse

Compliance with EU regulations

Ground

4.

FEATURE DETAILS

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5.

DISPLAY DESCRIPTION

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Direct Current

Alternating Current

Negative DC Value

Auto Power Off

Auto Range Active

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Data Hold

Diode Test

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Continuity Test

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ROTARY SWITCH FUNCTIONS

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Low Battery

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Main Display

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Resistance

DC/AC Current

DC/AC Voltage

2. AC Voltage:<600V

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1. DC Voltage:<600V

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DDM45 0

DDM45 0

1.Tur n rotary switch to DC voltage position.

2.Connect leads across voltage source/load.

3.Read voltage measurement on the display.

1.Tur n rotary switch to AC voltage position.

2.Connect leads across voltage source/load.

3.Read voltage measurement on the display.

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4. DC /AC Current ( ):<400mAMedium

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DDM45 0

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7. Resistance:<40MΩ

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1.Tur n rotary switch to A position.

2.Press FUNC to select DC or AC current.

3.Connect leads in series to circuit.

4.Read current measurement on the display.

3. DC /AC Current (large):<10A

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1.Tur n rotary switch to mA position.

2.Press FUNC to select DC or AC current.

3.Connect leads in series to circuit.

4.Read current measurement on the display.

5. DC /AC Current (Small):<4000µA

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DDM45 0

1.Tur n rotary switch to µA position.

2.Press FUNC to select DC or AC current.

3.Connect leads in series to circuit.

4.Read current measurement on the display.

6.1 Continuity:

6.2 Diode Test:

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DDM45 0

1.Tur n rotary switch to multifunction position

2.Press FUNC to switch to continuity mode

3.Connect leads across circuit.

4.If measured resistance is less than 50 , the buzzer will soundΩ

1.Tur n rotary switch to multifunction position.

2.Diode mode is default mode.

3.Connect INPUT lead to anode (+) and COM lead to cathode (-).

4.Read measured forward-biased voltage drop.

1.Tur n rotary switch to resistance position.

2.Connect leads across circuit.

3.Read resistance measurement on the display.

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8.

ELECTRICAL SPECIFICATIONS

DC Voltage Measurement

Range

Resolution

Accuracy

400mV 0.1mV

±(0.5% of reading +2 digits)

4V
40V
400V

0.001V

0.01V

0.1V

• Input impedance: 10MΩ

• Max. input voltage: 600V rms

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600V 1V

±(0.7% of reading +2 digits)

• Safety Rating: CAT III 600V; pollution degree: II

• Operating Altitude: 2000m

• Relative Humidity: 75% max

• Operating Temperature: 0°C~40°C/32°F~104°F (<80% RH)

• Storage Temperature: -10°C~60°C/14°F~140°F (<70% RH)

• Accuracy Temperature: -18°C~28°C/64°F~82°F (<80% RH)

• Temperature Coefficient: 0.1x(specified accuracy)/°C (<18°C or >28°C)

• Sampling Frequency: approx. 3 times/sec.

• Fuse Protection: µA/mA input: FF 600mA H 600V

10A input: FF 10A H 600V

• LCD Display: 3 ¾ digit display (4000 counts)

• Supply: 9V battery

• : 150mm×74mm×48mm / 6.3"×2.9"×1.9"

• Weight:

• Safety Standards: IEC61010-1

• Pollution Degree: 2

• Accuracy: ±(of reading + # of least significant digits)

Power
Dimensions

8.9oz/250g

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Specifications

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DDM45 0

10. Non-Contact Voltage Detector:

NCV

8. Battery Test:1.5V

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9. Battery Test:9V

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DDM45 0

1.Tur n rotary switch to 1.5V batter y test position.

2.Connect leads across battery

3.Read measured voltage on the display.

1.Tur n rotary switch to 9V batter y test position.

2.Connect leads across battery

3.Read measured voltage on the display.

1.In any mode, hold NCV button.

2.Move top of meter near voltage source.

3.If voltage is detected, the NCV indicator flashes/buzzer beeps.

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AC MeasurementCurrent

Range

Resolution

Accuracy

400 Aµ 0.1µA

±(1.8% of reading +3 digits)

4000µA
40mA
400mA

1µA

0.01mA

0.1mA

• Overload protection:
µA/mA input: Fuse(FF 400mA H 600V)
10A input: Fuse (FF 10A H 600V)

• Frequency response: 40~400Hz,
calibrated to rms of sine wave (average response)

• Max. input current:
µA/mA input: 400mA rms
10A input: 10A rms

10A 10mA

±(2.0% of reading +8 digits)

Resistance Measurement

Range

Resolution

Accuracy

400Ω 0.1Ω

±(0.7% of reading +3 digits)

4kΩ
40kΩ
400kΩ

0.001kΩ

0.01kΩ

0.1kΩ

• Max. input voltage: 600V rms

4MΩ 0.001MΩ
40MΩ 0.01MΩ

Continuity Test

Resolution

Description

0.1Ω

If measured resistance is greater than
50Ω, the meter's buzzer will sound.

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Overload protection: 600V rms
Open circuit voltage: ~1.0V DC

DC Current Measurement

Range

Resolution

Accuracy

400µA 0.1µA

±(1.0% of reading +5 digits)

4000µA
40mA
400mA

1µA

0.01mA

0.1mA

• Overload protection:

µA/mA input: Fuse(FF 400mA H 600V)
10A input: Fuse (FF 10A H 600V)

• Max. input current:
µA/mA input: 400mA rms
10A input: 10A rms

10A 10mA

±(2.0% of reading +8 digits)

AC Voltage Measurement

Range

Resolution

Accuracy

4V
40V
400V

0.001V

0.01V

0.1V

• Input impedance: 10MΩ

• Max. input voltage: 600V rms

• Frequency response: 40~400Hz,

calibrated to rms of sine wave (average response)

600V 1V

±(1.0% of reading +10 digits)

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10.

CLEANING

WARNING

To prevent injury or damage to the meter, do not allow moisture

inside the casing. Before opening the battery cover/case,

disconnect test leads from all circuits.

Clean the meter regularly with a damp cloth and a small amount of
detergent; do not use abrasives or solvents. Dirty/wet input jacks can
affect readings.
To clean input jacks:

1. Turn off the meter and remove test leads.

2. Brush off any dirt or contaminants from the input jacks.

3. Use a cotton swab with a cleaner/lubricant (i.e. WD40)

to clean the input jack.

4. Use a new swab on each jack to prevent cross contamination.

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REPLACING THE FUSES

WARNING

To prevent injury or damage to the meter,

turn off power to the meter and disconnect test leads

from before opening case.input jacks

To replace the fuses:

1. Turn off power to the meter.

2. Remove test leads from input jacks.

Remove the 6 screws on the back case

and remove back case from meter.

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5. Replace back cover and secure to meter.

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Replace blow fuse(s) with new fuses of the

same electrical ratings (see specifications).

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REPLACING THE BATTERY

To replace the :

1. Turn off power to the meter.

2. Remove test leads from input jacks.

3. Loosen the screw on the battery cover and remove cover from meter.

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5. Replace battery cover and secure to meter.

battery

Replace used battery with a new one.

WARNING

To avoid false reading that could lead to injury or damage to the

meter, replace the batteries as soon as the “ ” symbol appears.

Turn off the meter and remove the test leads before opening the

battery cover to avoid injury or damage to the meter.

9.

MAINTENANCE

This section provides basic maintenance principles, including replacing
batteries and fuses.
Do not attempt to repair or perform any maintenance on the meter not
included in the section below unless you are qualified personnel.

13.

DISPOSAL / RECYCLE

Caution: This symbol indicates that equipment and its accessories
shall be subject to a separate collection and correct disposal.

Diode Test

Resolution

Description

0.001V

Display shows the forward-biased
voltage drop of the diode.

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Overload protection: 600V rms
Open circuit voltage: ~3.2V DC
Test current: ~ 1.0mA

Battery Voltage Measurement

Range

Resolution

Accuracy

9V 0.01V

±(1.2% of reading +7 digits)

1.5V 0.001V

±(3.0% of reading +5 digits)