Greenlee DM-25 User manual

INSTRUCTION MANUAL
52059485 REV 1 © 2012 Greenlee Textron Inc. 1/12
DM-25
Digital Multimeter

2
Description
The Greenlee DM-25 Digital Multimeter is a hand-held testing device with the
following measurement capabilities: AC and DC voltage, and resistance. This
meter 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 equip-
ment. This instruction manual and any markings on the tool provide informa-
tion 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-25 Digital
Multimeter.
Keep this manual available to all personnel. Replacement manuals are avail-
able upon request at no charge at www.greenlee.com.
Do not discard this product or throw away!
For recycling information, go to www.greenlee.com.
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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SAFETY ALERT SYMBOL
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.
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.
Important Safety Information

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Electric shock hazard:
Contact with live circuits could result in severe injury
or death.
Electric shock hazard:
•The test leads supplied with this product comply with IEC 61010-
031:2008, UL 61010-031:2010 and CAN/CSA-C22.2 NO. 61010-031A-
07–Amendment 1:2010. These safety standards limit the exposed length
of the probe tip to 4 mm for measurement category III. These test leads
include a cap that must be in place when used in measurement category
III applications.
•Do not apply more than the rated voltage between any two input termi-
nals, or between any input terminal and earth ground.
•Do not contact the test lead tips or any uninsulated portion of the
accessory.
Failure to observe these warnings could result in severe injury or death.
Important Safety Information

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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. Do not use the unit if the contrasting
inner layer of insulation is visible.
•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 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:
•Unless measuring voltage, shut off and lock out power. Make sure that all
capacitors are discharged. Voltage must not be present.
•Set the selector and connect the test leads so that they correspond to the
intended measurement.
•Using this unit near equipment that generates electromagnetic interfer-
ence can result in unstable or inaccurate readings.
Failure to observe these warnings could result in severe injury or death.
Important Safety Information

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Important Safety Information
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.
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.
Note: The test leads of this unit are not removable. Do not attempt to remove
them.

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Identification
Display Icons
4. HV 600 V AC or DC range selected
5. –Polarity indicator
6. Low battery indicator
7. 1Overload indicator
Symbols on the Unit
Warning—Read the instruction manual
Battery
Double insulation
1
2
3
4
5
6
7
1. LCD display
2. Selector to select a function or
turn power off
3. Permanently attached test
leads and probes

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Using the Test Leads
Electric shock hazard:
The test leads supplied with this product comply with IEC 61010-031:2008,
UL 61010-031:2010 and CAN/CSA-C22.2 NO. 61010-031A-07–Amendment
1:2010. These safety standards limit the exposed length of the probe tip to 4
mm for measurement category III. These test leads include a cap that must
be in place when used in measurement category III applications.
Failure to observe this warning could result in severe injury or death.
CAT II 600VCAT III 600V
CAT III 600V
Cap can be removed for measurement category I or II applications.
Cap must be in place for
measurement category III
applications.

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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.
•If the unit still does not function as expected, call Greenlee for technical
assistance at 800-435-0786.
4. Take the reading from the circuit or component to be tested. If the resolu-
tion 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*
Diode
Resistance Ω
Battery Batt.
Voltage (DC)
Voltage (AC)
* Tone indicates continuity. The threshold is between 30 Ω and 100 Ω.

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Typical Measurements
AC Voltage
Measurement
Resistance
Measurement
600
2000k

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Typical Measurements
Continuity Check
Diode
Measurement
200
2000
Reverse Bias
Forward Bias
Red Probe

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Accuracy
Refer to the “Specifications” section for operating conditions and temperature
coefficient.
Accuracy is specified as follows: ± (a percentage of the reading + a fixed
amount) at 23 °C ± 5 °C (73.4 °F ± 9 °F), 0% to 75% relative humidity.
Accuracy is specified from 5% to 100% of the range unless noted otherwise.
AC Voltage
Range
(40 Hz to 400 Hz) Accuracy Input Impedance
200.0 V ± (1.2% + 1.0 V) 450 kΩ
600 V* ± (1.2% + 10 V)
* 600 V range is specified from 20% to 100% ofrange.
DC Voltage
Range Accuracy Input Impedance
20.00 V ± (0.8% + 0.05 V)
1 MΩ200.0 V ± (0.8% + 0.5 V)
600 V* ± (1.0% + 5 V)
* 600 V range is specified from 20% to 100% ofrange.
Resistance
Range Accuracy Open Circuit Voltage
200.0 Ω ± (1.2% + 0.5 Ω)
< 3 VDC
2000 Ω ± (1.0% + 5 Ω)
20.00 kΩ ± (1.0% + 0.05 kΩ)
200.0 kΩ ± (1.0% + 0.5 kΩ)
2000 kΩ ± (1.2% + 5 kΩ)

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Accuracy (con’t)
Battery Test
Test Current: Approximately 30 mA for 1.5 V, 8 mA for 9 V
Accuracy: ± (5% + 0.1 V)
Diode Test
Measuring Range: 2000 mV (on 2000 Ω setting)
Test Current (typical): 1.0 mA
Open Circuit Voltage (typical): < 3 V
Continuity
Tone Threshold: Between 30 Ω and 100 Ω
Specifications
Display: 3-1/2–digit LCD (1999 maximum count)
Polarity: Automatic
Sampling Rate: Approximately 2.5 per second
Temperature Coefficient: 0.2 x (accuracy) per °C below 18 °C or above 28 °C
Operating Conditions:
Temperature: 0 °C to 40 °C (32 °F to 104 °F)
Relative Humidity: 0% to 75%
Altitude: 2000 m (6500') maximum
Indoor use only
Pollution Degree: 2
Storage Conditions:
Temperature: –10 °C to 50 °C (14 °F to 122 °F)
Relative Humidity: 0% to 85%
Remove battery.
Battery: One 9 V battery (NEDA 1604, JIS 006P, or IEC 6F22)
Overload Protections: 600 VAC RMS and 600 VDC
Overvoltage Category: Category III 600 V

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Measurement Categories
These definitions were derived from the international safety standard for
insulation coordination as it applies to measurement, control, and labora-
tory equipment. These measurement categories are explained in more detail
by the International Electrotechnical Commission; refer to either of their
publications: IEC 61010-1 or IEC 60664.
Measurement Category I
Signal level. Electronic and telecommunication equipment, or parts thereof.
Some examples include transient-protected electronic circuits inside photo-
copiers and modems.
Measurement Category II
Local level. Appliances, portable equipment, and the circuits they are plugged
into. Some examples include light fixtures, televisions, and long branch circuits.
Measurement Category III
Distribution level. Permanently installed machines and the circuits they are
hard-wired to. Some examples include conveyor systems and the main circuit
breaker panels of a building’s electrical system.
Measurement Category IV
Primary supply level. Overhead lines and other cable systems. Some examples
include cables, meters, transformers, and other exterior equipment owned by
the power utility.
Statement of Conformity
Greenlee Textron Inc. is certified in accordance with ISO 9001 (2000) for our
Quality Management Systems.
The instrument enclosed has been checked and/or calibrated using equipment
that is traceable to the National Institute for Standards and Technology (NIST).

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Maintenance
Electric shock hazard:
Before opening the case, remove the test leads from the circuit and shut off
the unit.
Failure to observe this warning could result in severe injury or death.
Battery
Cover
Battery
Replacing the Battery
1. Disconnect the unit
from the circuit. Turn
the unit OFF.
2. Remove the rubber
boot.
3. Remove the screw
from the battery cover.
4. Remove the battery
cover.
5. Replace the battery
(observe polarity).
6. Replace the battery
cover, screw, and
rubber boot.
Cleaning
Periodically wipe the case with a damp cloth and mild detergent; do not use
abrasives or solvents.