Greenlee DM-40 User manual

999 6759.6 © 2005 Greenlee Textron Inc. 1/05
DM-40
Digital
Multimeter
Multímetro
digital
Contrôleur
numérique
INSTRUCTION MANUAL
MANUAL DE INSTRUCCIONES
MANUEL D’INSTRUCTIONS
Read and understand all of the instructions
and safety information in this manual before
operating or servicing this tool.
Lea y entienda todas las instrucciones y la
información sobre seguridad que aparecen
en este manual, antes de manejar esta
herramienta o darle mantenimiento.
Lire attentivement et bien comprendre
toutes les instructions et les informations sur
la sécurité de ce manuel avant d‘utiliser ou de
procéder à l‘entretien de cet outil.

2
Description
The Greenlee DM-40 Digital Multimeter is a hand-held testing device
with a backlit display and the following measurement capabilities:
AC and DC voltage, DC current, temperature (K-type thermocouples
only), and resistance. It also checks diodes, verifies continuity, and
tests 1.5 V and 9 V batteries.
Safety
Safety is essential in the use and maintenance of Greenlee tools and
equipment. This instruction manual and any markings on the tool
provide information for avoiding hazards and unsafe practices related
to the use of this tool. Observe all of the safety information provided.
Purpose of This Manual
This instruction manual is intended to familiarize all personnel with the
safe operation and maintenance procedures for the Greenlee DM-40
Digital Multimeter.
Keep this manual available to all personnel. Replacement manuals are
available upon request at no charge.
All specifications are nominal and may change as design improvements
occur. Greenlee Textron Inc. shall not be liable for damages resulting from
misapplication or misuse of its products.
® Registered: The color green for electrical test instruments is a registered
trademark of Greenlee Textron Inc.
KEEP THIS MANUAL

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Important Safety Information
This symbol is used to call your attention to hazards or unsafe
practices which could result in an injury or property damage. The
signal word, defined below, indicates the severity of the hazard.
The message after the signal word provides information for
preventing or avoiding the hazard.
SAFETY ALERT SYMBOL
Immediate hazards which, if not avoided, WILL result in severe
injury or death.
Hazards which, if not avoided, COULD result in severe injury or
death.
Hazards or unsafe practices which, if not avoided, MAY result in
injury or property damage.
Read and understand this material before
operating or servicing this equipment. Failure
to understand how to safely operate this tool
could result in an accident causing serious
injury or death.

4
Important Safety Information
Electric shock hazard:
Contact with live circuits could result in severe
injury or death.
Electric shock and fire hazard:
•Do not expose this unit to rain or moisture.
•Do not use the unit if it is wet or damaged.
•Inspect the test leads before use. They must be clean and dry,
and the insulation must be in good condition.
•Use this unit for the manufacturer’s intended purpose only, as
described in this manual. Any other use can impair the
protection provided by the unit.
Failure to observe these warnings could result in severe injury or
death.
Electric shock hazard:
•Do not apply more than the rated voltage between any two input
terminals, or between any input terminal and earth ground.
•Do not contact the test lead tips.
Failure to observe these warnings could result in severe injury or
death.

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5
Important Safety Information
Electric shock hazard:
•Do not operate with the case open.
• Before opening the case, remove the test leads from the circuit
and shut off the unit.
Failure to observe these warnings could result in severe injury or
death.
Electric shock hazard:
The fuse is an integral part of the overvoltage protection. When
fuse replacement is necessary, refer to “Specifications” for the
correct type, size and capacity. Using any other type of fuse will
void the overvoltage protection rating of the unit.
Failure to observe this warning could result in severe injury or
death.
Electric shock hazard:
•Unless measuring voltage or current, shut off and lock out
power. Make sure that all capacitors are discharged. Voltage
must not be present.
•Using this unit near equipment that generates electromagnetic
interference can result in unstable or inaccurate readings.
Failure to observe these warnings could result in severe injury or
death.

6
Important Safety Information
Set the selector and connect the test leads so that they correspond
to the intended measurement. Incorrect settings or connections
can result in a blown fuse.
Electric shock hazard:
•Do not attempt to repair this unit. It contains no user-serviceable
parts.
•Do not expose the unit to extremes in temperature or high
humidity. Refer to “Specifications.”
Failure to observe these precautions may result in injury and can
damage the unit.
Electric shock hazard:
Do not change the measurement function while the test leads are
connected to a component or circuit.
Failure to observe this precaution may result in injury and can
damage the unit.

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Identification
1. LCD display
2. HOLD button
3. LCD backlight enable
button
4. Selector
5. Positive input terminal
for all measurements
6. Negative, common
(COM), or ground
input terminal for all
measurements
Display Icons
7. 600 V AC or DC
range selected
8. HOLD function
enabled
9. –Polarity
indicator
10. Low battery
indicator
Symbols on the Unit
Warning—Read the instruction manual
Double insulation
Battery
1
4
2
5
3
6
7
9
10
H
8
Using the Features
•HOLD Button Press momentarily to hold the present value on the
display. will appear on the display.
Press again to return to normal mode.
•Button Press to illuminate the LCD. Press again to turn the
backlight off.

8
Operation
Electric shock hazard:
Contact with live circuits could result in severe
injury or death.
1. Refer to the Settings Table. Set the selector to the proper setting.
Start with the highest measurement range.
2. Refer to “Typical Measurements” for specific measurement
instructions.
3. Test the unit on a known functioning circuit or component.
•If the unit does not function as expected on a known functioning
circuit, replace the battery and/or fuse.
• If the unit still does not function as expected, send the unit to
Greenlee for repair. Refer to the instructions under the Warranty.
4. Take the reading from the circuit or component to be tested. If the
resolution is not satisfactory, remove the meter from the circuit
and change to the next lower range.
Settings Table
To measure this value: Set the selector to this symbol:
Continuity*
Current (DC)**
Diode
Resistance Ω
Voltage (AC)
Voltage (DC)
Battery 9V or 1.5V
Temperature °Cor °F
*Tone sounds if the measured resistance is less than approximately
25 Ω.
** Connect the unit in series with the test object and then switch the
test object on.

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Current Measurement
Voltage Measurement
Typical Measurements

10
Typical Measurements
Resistance
Measurement
Continuity
Check