5/96 FORM #262
OPERATING INSTRUCTIONS
MODEL DM-2A
POCKET-PRO
®
DIGITAL MULTIMETER
ONE YEAR LIMITED WARRANTY
A.W. Sperry Instruments, Inc., warrants that this A.W.
Sperry instrument has been carefully tested, inspect-
ed, and warranted for one (1) year from the date of
purchase by the original end user, provided the instru-
ment has not been misused, damaged due to
negligence, neglect or unauthorized repair, abused or
used contrary to the operating instructions.
Instruments and proof of purchase in the form of a
legible copy or original of the sales receipt clearly
identifying the distributor, model number and date of
purchase must be returned to A.W. Sperry
Instruments, Inc., Attention: Customer Service Center,
245 Marcus Boulevard, Hauppauge, New York 11788,
postage prepaid for examination and verification of
manufacturing defect under warranty. A.W. Sperry
Instruments, Inc., shall be the sole judge of such
defect. The liability of A.W. Sperry Instruments, Inc.,
shall be limited to the repair or replacement at its sole
option of any defective product.
1) INTRODUCTION
The DM-2A is an innovative concept in digital multimeter
design. It is a miniature ultra-slim DMM which combines
the measurement capabilities of a 16 range, 4 function
digital instrument with the handiness and simplicity of a
pocket calculator. The DM-2A features the latest develop-
ments in high-technology construction and design. All the
features of larger sized DMM’s are to be found in the
DM-2A. Autoranging, overload protection on all ranges,
auto polarity, audible/visual continuity indication, sturdy
ABS plastic case and much more. The DM-2A is
extremely easy to use. Two thumb operated switches
control all functions. The test leads are built into the
instrument and cannot be removed. They are always
there when you need them. A handy “booklet style” carry-
ing case which hold the instrument, test leads and
operating instructions is included, and allows the DM-2A
to be carried easily in your shirt pocket.
2) FEATURES
UL LISTED
…to both US and Canadian standards
16 RANGES, 4 FUNCTIONS
LIMITED ONE YEAR WARRANTY.
AUTO RANGING /MANUAL RANGING
SIMPLE OPERATION
CONTINUITY BUZZER
RANGE HOLD BUTTON
BUILT IN TEST LEADS
3) SPECIFICATIONS
Display:
3
1
⁄
2
digit liquid crystal display (LCD),
maximum reading 1999 with automatic
sign and function annunciators.
Range
Selection:
Autoranging/Manual ranging.
Polarity:
Automatic (-) negative polarity
indication.
Overrange:
Most significant digit blinks
Low Battery
Indication:
The “B” is displayed when the battery
voltage drops below the operating
level.
Measurement
Rate:
2.5 times per second, nominal.
Operating
Environment:
0° to 40°C (32° to 104°F) Max RH
80% to 31°C, decreasing linearly to
50% RH at 40°C.
Storage
Temperature:
-20°C to 60°C (-4° to 140°F) at
80% relative humidity.
Power:
Two 1.5V button-type batteries
(IEC # LR-44, NEDA #1166A).
Sperry Part #B-6
Power
Consumption:
5mW typical.
Dimensions:
4
3
⁄
8
"H x 2
1
⁄
4
"W x
3
⁄
8
"D
(111.5mm H x 56mm W x 10.5mm D)
Weight:
Approx. 3.0 oz (86g) including
batteries and case.
Instrument complies with insulation category (over volt-
age category II). Pollution degree 2 in accordance with
IEC-1010-1 Indoor use. If the equipment is used in a
manner not specified, the protection provided by the
equipment may be impaired.
4) PACKAGING
The DM-2A comes complete with two B-6 batteries, C-77
carrying case and form # 262 operating instructions.
DOUBLE INSULATION
WARNING:
TO AVOID ELECTRIC SHOCK DISCONNECT
MEASURING TERMINALS BEFORE REMOVING BACK COVER.
AVIS:
POUR EVITER LE CHOC ELECTRIQUE DEBRANCHER
LES BORNES DE MEAURE AVANT D’ENLEVER LE CAPOTAGE
ARRIERE.
WHEN SERVICING, USE ONLY SPECIFIED
“REPLACEMENT PARTS” OR EQUIVALENT.
5) SAFETY PRECAUTIONS
The following safety precautions must be observed to
insure maximum personal safety during the operation at
this meter.
1. Read these operating instructions thoroughly and
completely before operating your Pocket Pro. Pay
particular attention to WARNINGS which will inform
you of potentially dangerous procedures. The
instructions in these warnings must be followed.
2. Always inspect your meter, test leads and
accessories for any sign of damage or abnormality
before every use. If any abnormal conditions exists
(e.g. broken test leads, cracked cases, display not
reading, etc.), do not attempt to take any
measurements. Refer to Return for Repair section.
3. Never ground yourself when taking electrical
measurements. Do not touch exposed metal pipes,
outlets, fixtures, etc. which might be at ground
potential. Keep your body isolated from ground by
using dry clothing, rubber shoes, rubber mats, or any
approved insulating material.
4. To avoid electric shock use CAUTION when working
with voltages above 40Vdc or 20Vac. Such voltages
pose a shock hazard.
5. Never exceed the maximum allowable input value of
any function when taking measurement. Refer to the
chart above for maximum inputs
6. Never touch exposed wiring, connections or any live
circuit when attempting to take measurements.
7. Do not attempt to operate this instrument in an
explosive atmosphere (i.e in the presence of
flammable gases or fumes, vapor or dust).
8. When testing for the presence of voltage make sure
the voltage function is operating properly by reading
a known voltage in that function before assuming
that a zero reading indicates a no-voltage condition.
Always Think Safety, Act Safely
6) OPERATION
Before taking any measurements, read the Safety
Information Section. Always examine the instrument for
damage, contamination (excessive dirt, grease, etc.) and
defects. Examine the test leads for cracked or frayed
insulation. If any abnormal conditions exist do not attempt
to make any measurements. To clean, wipe with a clean
dry cloth.
Autoranging
The meter defaults to autorange when you turn it on. In
autorange, the meter selects the range automatically.
Manually Selecting a Range
The meter also has a manual range mode. In manual
range, you select and lock the meter in a range. To man-
ually select a range:
Press [RANGE HOLD] button to hold the selected range.
Subsequently pressing the [RANGE HOLD] button will
select each range in sequence from the lowest to the
highest range. Hold the button for 2 seconds to return to
the Autorange Mode.
Data Hold Feature
Press [DATA HOLD] button to toggle in and out of the
Data Hold mode. In the data hold mode, the annunciator
is displayed and the last reading is held on the display.
Press [DATA HOLD] button again to release the hold and
current readings are once again displayed.
Measuring Voltage
1. Set the Function Switch to “VOLT” position.
2. Select the Mode Switch to desired AC voltage range
or DC voltage range.
WARNING
To avoid possible electric shock and/or instrument
damage, do not attempt to take any voltage measure-
ments if the voltage is above 450Vdc/ac is the
maximum voltage that this meter is designed to mea-
sure. the black (-) test lead potential should not
exceed 450Vdc/ac measured to earth ground.
3. Apply the test lead probe tips to the two points
where a voltage reading is to be taken. The meter
will automatically select the proper range and display
the reading.
4. When measurements are completed, disconnect the
test leads from the circuit under test.
Measuring Resistance
1. Set the Function Switch to “
Ω
/ •
)
)
)
” position.
2. Select the Mode Switch to “
Ω
” position.
3. Completely de-energize the circuit or device to be
measured. Connect the test lead probe tips to the
device.
4. The meter will automatically select the proper range
and display the reading.
Note:
The most significant digit blink indicates an overrange
condition. This will occur with the test leads open.
Measuring Continuity
1. Set the Function Switch to “
Ω
/•
)
)
)
” position.
2. Select the Mode Switch to “•
)
)
)
” position.
3. Connect the test leads to the two points at which
continuity is to be tested. The buzzer will sound if
the resistance is approximately 650
Ω
± 200
Ω
.
WARNING
All resistance and continuity measurements should
be taken on de-energized circuits only to insure safe
and accurate measurements. To avoid possible elec-
trical shock, instrument damage and/or equipment
damage, do not connect the test leads to circuits hav-
ing a potential difference greater than 450Vdc/ac. Do
not connect the test leads to potentials exceeding
450V to earth ground.
7) BATTERY REPLACEMENT
Power is supplied by two button-type batteries (NEDA
1166A, IEC LR-44). “B” appears on the LCD display
when replacement is needed.
WARNING
Before attempting to replace the battery, first discon-
nect the Test Leads from any energized circuit.
1. Disconnect the test leads from any energized circuit.
2. Set the Function Switch to OFF.
3. Remove battery cover screw.
4. Slide off battery cover and change batteries.
5. Replace battery cover and screw.
A.W. SPERRY INSTRUMENTS INC.
The Professional’s Choice
®
Battery Replacement
Battery
Compartment Cover
Screw
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5/96 Formulario No. 262
INSTRUCCIONES DE MANEJO
MODELO DM-2A
POCKET-PRO
®
MULTIMETRO DIGITAL
GARANTIA LIMITADA DE UN AÑO
A.W. Sperry Instruments, Inc., garantiza que este instrumento A.W.
Sperry ha sido cuidadosamente probado, inspeccionado y garantiza-
do por un (1) año a partir de la fecha de compra por el usuario final
original, a condición de que el instrumento no haya sido usado inde-
bidamente, dañado debido a negligencia, descuido o reparación no
autorizada, abusado o usado en forma contraria a las instrucciones
de manejo. Los instrumentos y la prueba de compra en forma de
una copia u original legible del recibo de venta que identifique clara-
mente el distribuidor, el número de modelo y la fecha de compra,
deben ser devueltos a A.W. Sperry Instruments, Inc., Attention:
Customer Service Center, 245 Marcus Boulevard, Hauppauge, New
York 11798, con franqueo prepago para el examen y verificación del
defecto de fabricación bajo garantía. A.W. Sperry Instruments, Inc.,
será el único juez de dicho defecto. La responsabilidad de A.W.
Sperry Instruments, Inc., se limitará a la reparación o cambio a su
sola opción de cualquier producto defectuoso.
1) INTRODUCCION
El modelo DM-2A es un concepto innovador en el diseño
de multímetros digitales. Es un MMD ultradelgado en
miniatura que combina la capacidad de medición de un
instrumento digital de 16 gamas y 4 funciones con la
practicidad y simplicidad de una calculadora de bolsillo.
El modelo DM-2A presenta los últimos adelantos en con-
strucción y diseño de alta tecnología. Todas las
características de los MMD de tamaño más grande se
encuentran en el modelo DM-2A. Selección automática
de gamas, protección contra sobrecarga en todas las
gamas, autopolaridad, indicación de continuidad audi-
ble/visual, estuche plástico ABS resistente y mucho más.
El modelo DM-2A es sumamente fácil de usar. Dos
selectores accionados con el dedo pulgar controlan todas
las funciones. Los conductores de pruebas están incor-
porados en el instrumento y no se pueden quitar.
Siempre están allí cuando usted los necesita. Se incluye
un práctico estuche estilo “libreta” que contiene el instru-
mento, los conductores de pruebas y las instrucciones de
manejo y permite que usted pueda llevar el DM-2A
fácilmente en el bolsillo de la camisa.
2) CARACTERISTICAS
LISTADO POR LA ASOCIACION DE ASEGURADORES
(UL)
...según las normas de EE.UU. y Canadá
16 GAMAS, 4 FUNCIONES
GARANTIA LIMITADA DE UN AÑO
SELECCION DE GAMAS AUTOMATICA Y MANUAL
MANEJO SENCILLO
APAGADO AUTOMATICO
ZUMBADOR DE CONTINUIDAD
BOTON DE RETENCION DE GAMA
CONDUCTORES DE PRUEBAS INCORPORADOS
3) ESPECIFICACIONES
Visualizador:
Visualizador de cristal líquido digital
de 3
1
/
2
(LCD), lectura máxima de 1999
con señal automática y anunciadores
de función.
Selección de
gamas:
Selección de gamas automática y
manual.
Polaridad:
Indicación de polaridad negativa (-)
automática.
Sobregama:
El dígito más significativo centellea.
Indicación de
poca pila:
Aparece la “B” cuando el voltaje de la
pila cae por debajo del nivel de
operación.
Velocidad
de medición:
2,5 veces por segundo, nominal.
Ambiente de
operación:
0° a 40°C (32° a 104°F). Humedad
relativa máxima de 80% a 31°C,
disminuyendo linealmente a una
humedad relativa de 50% a 40°C.
Temperatura de
almacenamiento:
-20°C a 80°C (-4° a 140°F) a <80% de
humedad relativa.
Energía:
Dos pilas tipo botón de 1,5V
(IEC # LR-44, NEDA # 186A).
Pieza Sperry # B-6
Consumo de
energía:
5mW normalmente.
Dimensiones:
4
3
/
8
” de altura, 2
1
/
4
” de ancho y
3
/
4
” de
profundidad (111,5 mm de altura x
56 mm de ancho x 10,5 mm de
profundidad)
Peso:
Aproximadamente 3,0 onzas
(86 gramos) incluyendo las pilas y el
estuche.
El instrumento cumple con la categoría de aislación (cat-
egoría de sobrevoltaje II). Grado de contaminación 2 de
conformidad con la IEC-1010-1. Uso en interiores. Si el
equipo se utiliza en una forma no especificada, la protec-
ción suministrada por el equipo puede verse afectada
negativamente.
4) EMPAQUE
El modelo DM-2A incluye dos pilas B-6, un estuche portátil
C-77 e instrucciones de manejo, formulario No. 262.
DOBLE AISLACION
ADVERTENCIA:
PARA EVITAR CHOQUE ELECTRICO,
DESCONECTE LAS TERMINALES DE MEDICION ANTES DE
QUITAR LA TAPA POSTERIOR.
Cuando servicio, usa soló especifico “partes de
recambió” o equivalente.
A.W. SPERRY INSTRUMENTS INC.
The Professional’s Choice
®
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