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Chapter Title Page
Table of Contents
1. Before You Start
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2. Getting Acquainted
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3. Making Measurements
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Chapter Title Page
Table of Contents
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4. Using Stores, Recall and Send Features
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5. Changing the Default Setting
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6. Maintenance
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Chapter Title Page
Table of Contents
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7. Specifications
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Table Title Page
List of Tables
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Table Title Page
List of Tables
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Overview
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Warning
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“Safety Information” and “Rules for Safe Operation”
carefully before using the Meter.
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Chapter 1
Before You Start
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Item Description Qty
Unpacking Inspection
Open the package case and take out the Meter. Check the items shown on Table 1-1 carefully to see any missing
or damaged part:
ATTENTION:
In the event you find any missing or damage, please contact your dealer immediately.
1
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English Operating Manual
1.5V Battery (R14)
1 piece
Test Lead 1 pair
CD-ROM (Installation Guide & Computer Interface Software) 1 piece
6 pieces
AC220V/50Hz Power Cable 1 piece
Table 1-1. Unpacking Inspection
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Test Clip
USB interface cable
RS232C interface cable
Alligator Clip 1 piece
1 pair
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K-Type (nickel chromium ~ nickel silicon) Point Contact Temperature Probe (It is
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Accessories Item 5 to 10（figure 6-2 page 53）are stored in the back of the machine.
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Safety Information
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Rules For Safe Operation
Warning
To avoid possible electric shock or personal injury,
and to avoid possible damage to the Meter or to the
equipment under test, adhere to the following rules:
Before using the Meter inspect the case. Do not
use the Meter if it is damaged or the case (or part
of the case) is removed. Look for cracks or
missing plastic.
Inspect the test leads for damaged insulation or
exposed metal. Check the test leads for continuity.
Replace damaged test leads with identical model
number or electrical specifications before using
the Meter.
Do not apply more than the rated voltage or
current, as marked on the Meter, between the
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terminals or between any terminal and grounding.
The rotary switch should be placed in the right
position and no any changeover of range shall
be made during measurement is conducted to
prevent damage of the Meter. Must disconnect
the connection between the test leads and the
tested circuit before changing the measurement
position of the rotary switch.
During measurement, do not contact naked wire,
connector, un-used input terminal or the circuit
in used.
When the Meter working at an effective voltage
over 60V in DC or 30V in AC, special care should
be taken for there is danger of electric shock.
Use the proper terminals, function, and range for
your measurements.
If the value to be measured is unknown, use the
maximum measurement position.
Do not use or store the Meter in an environment
of high temperature, humidity, explosive,
inflammable and strong magnetic field. The
performance of the Meter may deteriorate after
dampened.
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When using the test leads, keep your fingers
behind the finger guards.
Disconnect circuit power and discharge all high-
voltage capacitors before testing resistance,
continuity and diodes.
Before measuring current, check the Meter’s fuses
and turn off power to the circuit before connecting
the Meter to the circuit.
When under battery operated situation, 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.
When servicing the Meter, use only the same
model number or identical electrical specifications
replacement parts.
The internal circuit of the Meter shall not be altered
at will to avoid damage of the Meter and any
accident.
Soft cloth and mild detergent should be used to
clean the surface of the Meter when servicing.
No abrasive and solvent should be used to prevent
the surface of the Meter from corrosion, damage
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International Electrical Symbols
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and accident.
The Meter is suitable for indoor use.
When under battery operated situation, turn the
Meter off when it is not in use and take out the
battery when not using for a long time.
When under battery operated situation, constantly
check the battery as it may leak when it has been
using for some time, replace the battery as soon
as leaking appears. Aleaking battery will damage
the Meter.
Under the influence of Radiated Radio-Frequency
Electromagnetic Field & Conducted Radio-
Frequency Electromagnetic Field phenomenon,
the captioned model have a magnificent error in
temperature measurement, it will be back to
normal when the interference is removed.
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Turning the Meter On
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Battery Considerations
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Chapter 2
Getting Acquainted
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Warning
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The Meter Structure
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Rotary Switch
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Model DM-442B: OPERATING MANUAL
www.calcert.com [email protected]1.800.544.2843 0
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Function Primary Display Lower Right Secondary
Display Upper Right Secondary Display
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Model DM-442B: OPERATING MANUAL
www.calcert.com [email protected]1.800.544.2843 0
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15
20
25
30
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