Greenlee DM-20 User manual

999 6758.8 © 2004 Greenlee Textron Inc. 12/04
DM-20
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-20 Digital Multimeter is a hand-held testing device
with the following measurement capabilities: AC and DC voltage,
DC current, 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-20
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

DM-20
3
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.

DM-20
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.
Note: The test leads of this unit are not removable. Do not attempt to
remove them.

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Identification
1. LCD display
2. Selector to select
a function or turn
power off
3. Permanently
attached test
leads and probes
Display Icons
4. 300 V AC or DC range
selected
5. –Polarity indicator
6. Low battery indicator
7. 1 Overload indicator
Symbols on the Unit
Warning—Read the instruction manual
Double insulation
Battery
1
2
3
4
5
6
7

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 fuses.
• 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
*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

DM-20
11
Diode Measurement
Typical Measurements
Reverse Bias
Forward Bias
Red Probe

12
Accuracy
Refer to “Specifications” 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 80% relative
humidity.
AC Voltage
Frequency Input
Range Accuracy Range Impedance
199.9 V ±(1.5% + 0.4 V) 45 to 400 Hz 0.5 MΩ
300 V ±(2.0% + 4 V)
DC Current
Range Accuracy Burden Voltage
1999 µA±(2.5% + 4 µA)
19.99 mA ±(2.5% + 0.04 mA) < 0.7 V
199.9 mA ±(2.5% + 0.4 mA)
Resistance
Range Accuracy Typical Open Circuit Voltage
199.9 Ω±(1.5% + 0.5 Ω)3.2 VDC
1999 Ω±(1.5% + 0.005 kΩ)
19.99 kΩ±(1.5% + 0.05 kΩ)
199.9 kΩ±(1.5% + 0.5 kΩ)>0.3 VDC
1999 kΩ±(2.0% + 0.004 MΩ)
DC Voltage
Range Accuracy Input Impedance
199.9 mV ±(1.2% + 0.2 mV)
1.999 V ±(1.2% + 0.002 V)
19.99 V ±(1.2% + 0.02 V) 1 MΩ
199.9 V ±(1.2% + 0.2 V)
300 V ±(1.5% + 2 V)

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Specifications
Display: 3-1/2–digit LCD (1999 maximum count)
Polarity: Automatic
Sampling Rate: 2.5 per second
Temperature Coefficient: 0.1 x (accuracy) per °C below 18 °C
or above 28 °C
Overload Protections:
mA and Battery Test: 0.315 A/250 V F fuse, interrupting rating
1500 A, 5 mm x 20 mm
All Other Functions: 300 VAC RMS and 300 VDC
Measurement Category: Category II, 300 V
Operating Conditions: 0 °C to 40 °C (32 °F to 104 °F),
0 to 80% relative humidity
Altitude: 2000 m (6500’) maximum
Indoor use only
Pollution Degree: 2
Storage Conditions: –10 °C to 60 °C (14 °F to 140 °F),
0 to 70% relative humidity
Remove battery
Battery: 9-Volt battery (NEDA 1604, JIS 006P or IEC 6F22)
Accuracy (cont’d)
Battery Test
Test Current: Approximately 14 mA for 1.5 V, 8 mA for 9 V
Accuracy: ±(5% + 0.1 V)
Diode Test
Open Circuit Voltage: 3.2 VDC (maximum)
Test Current (Typical): 1.0 mA
Continuity
Tone indicates continuity. Threshold is approximately 30 Ω.
Resolution: 1 Ω
Open Circuit Voltage: 3.2 VDC (maximum)

14
Measurement Categories
These definitions were derived from the international safety standard
for insulation coordination as it applies to measurement, control, and
laboratory 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 photocopiers 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 9000 (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).

DM-20
15
Maintenance
Battery and Fuse Replacement
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 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.
1. Disconnect the unit from the circuit. Turn the unit OFF.
2. Remove the screws from the back cover. Remove the back cover.
3. Replace the battery (observe polarity) and/or fuse.
4. Replace the cover and screws.
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.

16
Maintenance (cont’d)
Cleaning
Periodically wipe the case with a damp cloth and mild detergent; do
not use abrasives or solvents.

DM-20
17
Descripción
El Multímetro digital modelo DM-20 de Greenlee es un instrumento de
verificación capaz de efectuar los siguientes tipos de mediciones:
tensión alterna y continua, corriente continua, y resistencia. Esta
unidad es de bolsillo y cabe perfectamente en la palma de la mano.
Además, este multímetro verifica diodos, continuidad y prueba pilas de
1,5 V y 9 V.
Acerca de la seguridad
Es fundamental observar métodos seguros al utilizar y dar
mantenimiento a las herramientas y equipo Greenlee. Este manual de
instrucciones y todas las marcas que ostenta la herramienta le ofrecen
la información necesaria para evitar riesgos y hábitos poco seguros
relacionados con su uso. Siga toda la información sobre seguridad que
se proporciona.
Propósito de este manual
Este manual de instrucciones tiene como propósito familiarizar a todo
el personal con los procedimientos de operación y mantenimiento
seguros para el Multímetro digital modelo DM-20 de Greenlee.
Manténgalo siempre al alcance de todo el personal. Puede obtener
copias adicionales de manera gratuita, previa solicitud.
Todas las especificaciones son nominales y pueden cambiar conforme
tengan lugar mejoras de diseño. Greenlee Textron Inc. no se hace
responsable de los daños que puedan surgir de la mala aplicación o mal
uso de sus productos.
® Registrado: El color verde para instrumentos de verificación eléctricos es
una marca registrada de Greenlee Textron Inc.
CONSERVE ESTE MANUAL

18
Importante Información sobre Seguridad
Este símbolo se utiliza para indicar un riesgo o práctica poco
segura que podría ocasionar lesiones o daños materiales. Cada
uno de los siguientes términos denota la gravedad del riesgo. El
mensaje que sigue a dichos términos le indica cómo puede evitar o
prevenir ese riesgo.
SÍMBOLO DE ALERTA
SOBRE SEGURIDAD
Peligros inmediatos que, de no evitarse, OCASIONARÁN graves
lesiones o incluso la muerte.
Peligros que, de no evitarse, PODRÍAN OCASIONAR graves
lesiones o incluso la muerte.
Peligro o prácticas peligrosas que, de no evitarse, PUEDEN
OCASIONAR lesiones o daños materiales.
Lea y entienda este documento antes de
manejar esta herramienta o darle
mantenimiento. Utilizarla sin comprender
cómo manejarla de manera segura podría
ocasionar un accidente y, como resultado de
éste, graves lesiones o incluso la muerte.

DM-20
19
Importante Información sobre Seguridad
Peligro de electrocución:
El contacto con circuitos activados podría
ocasionar graves lesiones o incluso la muerte.
Peligro de electrocución e incendio:
• No exponga esta unidad ni a la lluvia ni a la humedad.
•No utilice esta unidad si se encuentra mojada o dañada.
•Revise minuciosamente los cables de prueba antes de utilizarlos.
Deberán estar limpios y secos, y su forro aislante deberá hallarse
en buenas condiciones.
• Utilícela únicamente para el propósito para el que ha sido
diseñada por el fabricante, tal como se describe en este manual.
Cualquier otro uso puede menoscabar la protección
proporcionada por la unidad.
De no observarse estas advertencias podrían sufrirse graves
lesiones o incluso la muerte.
Peligro de electrocución:
•No aplique más de la tensión nominal entre dos terminales de
entrada cualesquiera, o entre una terminal de entrada cualquiera
y una conexión a tierra.
•No toque las puntas de los cables de prueba.
De no observarse estas advertencias podrían sufrirse graves
lesiones o incluso la muerte.

20
Importante Información sobre Seguridad
Peligro de electrocución:
•No haga funcionar esta unidad con la caja abierta.
•Antes de abrir la caja, retire del circuito los cables de prueba y
apague la unidad.
De no observarse estas advertencias podrían sufrirse graves
lesiones o incluso la muerte.
Peligro de electrocución:
El fusible es una parte integral para la protección contra
sobretensión. Cuando sea necesario reemplazarlo, consulte la
sección “Especificaciones” para saber qué tipo, tamaño y
capacidad debe tener. Utilizar cualquier otro tipo de fusible anulará
la clasificaciónde protección de sobretensión de la unidad.
De no observarse esta advertencia podrían sufrirse graves lesiones
o incluso la muerte.
Peligro de electrocución:
•Amenos que vaya a medir tensión o corriente, apague y bloquee
la energía. Asegúrese de que todos los condensadores estén
totalmente sin carga. No debe haber tensión alguna.
•Al utilizar esta unidad cerca de equipo que genere interferencia
electromagnética quizá se obtenga una lectura inexacta e
inestable.
De no observarse estas advertencias podrían sufrirse graves
lesiones o incluso la muerte.