Instrument complies with insulation category (over voltage
category) III. Industrial use. Pollution degree 2 in
accordance with IEC-664. Altitude up to 2000M. Indoor
use. If the equipment is used in a manner not specified,
the protection provided by the equipment may be
impaired.
DOUBLE INSULATION
WARNING:
TO AVOID ELECTRIC SHOCK
DISCONNECT MEASURING TERMINALS
BEFORE REMOVING BATTERY COVER.
CAUTION:
FOR CONTINUED PROTECTION
AGAINST FIRE, REPLACE ONLY WITH FUSE OF
THE SPECIFIED VOLTAGE, CURRENT AND
RUPTURE SPEED RATINGS.
resistente a los golpes, soporta el uso y el abuso del
servicio diario y a’sla electrónicamente al usuario de
riesgos de choque eléctrico potenciales. La protección
electrónica contra sobrecargas por aplicación accidental
de tensión a los circuitos para medición de resistencia y
continuidad, combinada con su construcción reforzada,
hacen de él un instrumento duradero y confiable.
Sección 2 CARACTERÍSTICAS
• Répertorié UL selon les normes américaines
et canadiennes
• Conçu pour la catégorie III 600 V
• Tamaño de bolsillo
• Operación sencilla
• Mesures de valeur efficace réelle (DM-370A)
• Terminales de entrada empotrados, diseñados para
brindar seguridad
• Protección contra sobrecargas en todas las escalas
• Función de prueba de diodos
Sección 3 ESPECIFICACIONES
Indicador
LCD (pantalla de cristal
l’quido) de 3-1/2 dígitos,
nœmeros de 16
mm y lectura máxima de
1999 con signo automático
Indicaci—n de escala excedida
Muestra “1” como dígito
más significativo
Velocidad de muestreo
Tres veces por segundo
Ambiente para operación
0 a 50 °C, máxima
humedad relativa 80% a 31
°C, decreciendo linealmente
a 50% con 40 °C
Ambiente para almacenamiento
-20 a 60 °C con humedad
relativa inferior a 80%
Alimentación
Una pila de 9 V, apta para
transistores, N° de pieza
AWS B-4 (N° NEDA 1604)
Requisitos de potencia
Normal: 30 m
Ω
(típicos)
Vida útil de la pila
Normal: 2000 horas con pila
de zinc-carbón
Fusible
N° de pieza AWS F-7; 0,5 A,
250 V, 5 x 20 mm, acción
rápida. Fusible à
déclenchement instantané en
céramique de AWS, Réf. F-
31, 10 A, 250 V mesurant 5 x
20 mm. (DM-370A)
Dimensiones
143 (l) x 79 (a) x 33 (p) mm
Peso
Aproximadamente 160 g
con la pila
L’instrument se conforme aux installations de catégorie III
(catégorie surtension). Pour usage industriel. Niveau de
pollution 2 en conformit´avec IES-664. Altitude atteignant
2000m. Utilisation interne. Si el equipo se utiliza en una
forma no especificada, la protección provista puede quedar
reducida.
DOBLE AISLACIÓN
ADVERTENCIA:
PARA EVITAR CHOQUES
ELÉCTRICOS, ANTES DE SACAR LA TAPA DE LA
PILA DESCONECTE LOS TERMINALES DE
MEDICIÓN.
PRECAUCIÓN:
PARA TENER PROTECCIÓN
CONTINUA CONTRA INCENDIOS, REEMPLACE EL
FUSIBLE SOLAMENTE POR OTRO QUE
SATISFAGA LOS REQUERIMIENTOS DE TENSION,
CORRIENTE Y VELOCIDAD DE RUPTURA
ESPECIFICADOS.
Protección contra sobrecargas:
500 VCC o VC
Apico — Electrónica (sin fusión de fusible).
Sección 4 REGLAS DE SEGURIDAD
1 .
Antes de operar su multímetro digital, lea estas
instrucciones en forma completa y atenta. Preste
atención particular a las ADVERTENCIAS y a las
PRECAUCIONES que informan sobre
procedimientos potencialmente peligrosos. Estas
instrucciones deben ser respetadas.
2 .
Antes de cada uso, verifique siempre que los cables
de prueba y los accesorios no tengan signos de
daño o de anormalidad. Si existe alguna condición
anormal (por ejemplo, puntas de prueba rotas, caja
rajada, pantalla sin lecturas, etc.), no intente efectuar
ninguna medición. Consulte la sección 12.
Devolución para reparaciones.
3
. Cuando emplee instrumentos eléctricos, nunca se
conecte a tierra. No toque caños metálicos expuestos,
tomacorrientes, herrajes, etc., que puedan tener igual
potencial que la tierra. Mantenga su cuerpo aislado de
tierra usando ropa seca, zapatos con suela de goma,
alfombras de goma o cualquier material aislante
aprobado.
4.
Cuando intente efectuar mediciones, nunca toque
cables expuestos, conexiones o conductores de
circuitos alimentados (vivos).
5 .
Nunca reemplace el fusible protector dentro del
multímetro digital por alguno que no sea la pieza con
el nœmero especificado por AWS u otro aprobado
como equivalente.
6 .
Recuerde: Piense en la seguridad y actœe
seguramente.
7.
Cuando pruebe si hay tensión presente, asegœrese
de que la función medición de tensión funcione
correctamente leyendo una tensión conocida en esa
gama, antes de suponer que una lectura de cero
indica una condición de sin tensión.
8 .
Las calibraciones y las reparaciones sólo deben ser
efectuadas por personal de servicio calificado.
9 .
No intente realizar la calibración o el servicio del
instrumento, a menos que esté presente otra
persona capaz de prestar primeros auxilios y aplicar
técnicas de reanimación.
10.
No instale piezas substitutas ni efectœe
modificaciones no autorizadas en el instrumento.
Para asegurar que se mantengan las caracter’sticas
de seguridad, env’e el instrumento a A. W. Sperry
Instruments para su servicio y reparación.
1 1 .
Para evitar los choques eléctricos emplee
PRECAUCION cuando trabaje con tensiones
superiores a 40 VCC o 20 VCA. Tales tensiones
presentan riesgos de choques eléctricos.
1 2 .
No opere este instrumento en una atmósfera
explosiva (por ejemplo, en presencia de gases,
humos, vapores o polvaredas inflamables).
Sección 5 PREPARACIÓN PARA EL USO
Sección 5.1
DESEMBALAJE Y VERIFICACIÓN DEL CONTENIDO
El DM-350A se env’a completo y listo para usar. Verifique
la siguiente lista de contenido cuando lo desembale. Si
falta alguna pieza, notifique al distribuidor a quien le
compró el instrumento o a A. W. Sperry Instruments, Inc.:
• Instrucciones de Operación N° 312.
• Puntas de prueba TL-76 (una negra y una roja)
• Pila de 9 V apta para transistores (N° de pieza
AWS B-4). Para instalarla correctamente,
vea la sección 10.2, Reemplazo de la pila.
• Un fusible de 0,5 A, 250 V, 5 x 20 mm y acción
rápida, N° de pieza AWS F-7.
(Vea la sección 10.3, Reemplazo del fusible).
Sección 5.2
PROCEDIMIENTO ANTERIOR A LA OPERACIÓN
1 .
Instale la pila de 9 V apta para transistores (N° de
pieza AWS F-7).
2 .
Inspeccione el instrumento para comprobar que no
tenga ningœn defecto externo (compárelo con el
diagrama de la página 1). Si existe alguna condición
anormal, no intente efectuar ninguna medición.
Consulte la sección 9, Mantenimiento y la sección 12,
Devolución para reparaciones.
3 .
Inserte las puntas de prueba en los receptáculos
hembra “COM” y “V-
Ω
”. Conecte entre sílos dos
extremos de las puntas de prueba.
4 .
Coloque el conmutador selector en las escalas que se
indican en la tabla que sigue. Verifique que la
respuesta del instrumento sea adecuada.
Escala
Lectura d el instrumento
600VDC (600 VCC)
000 ± 4 dígitos
200DCV (200 VCC)
00.0 ± 4 dígitos
20DCV (20 VCC)
0.00 ± 4 dígitos
2DCV (2 VCC)
0.000 ± 4 dígitos
200
Ω
(200
Ω
)
1_ _.
2K
Ω
(2 k
Ω
) 1.
20K
Ω
(20 k
Ω
)
1_.
200K
Ω
(200 k
Ω
)
1_ _.
5 .
Como usted puede observar, el punto decimal se
mueve a medida que se cambia la escala. La lectura
máxima del indicador es 1999. La escala de 200DCV
(200 VCC) sólo leerá realmente hasta 199,9 VCC. Se
denomina escala de 200 VCC sólo por razones de
conveniencia.
6 .
Ahora usted puede verificar el punto decimal para
cada escala consultando la sección 3,
Especificaciones, donde se listan las escalas.
Consulte las columnas Escala y Resolución para
computar la posición del punto decimal.
7 .
Si existe alguna condición anormal, no intente
efectuar ninguna medición eléctrica. En lugar de ello,
consulte la sección 12, Devolución para reparaciones.
Sección 6
REEMPLAZO DE LA PILA
El DM-350A tiene una fuente de alimentación interna que
Tensíon Alterna
Rango 26, 7 Funciones
Rango 20, 7 Funciones
Rango 17, 5 Funciones
DM-370A
DM-360A
DM-350A
Rango
Precisión
Básica
Resolución
Impedancia
de Entrada
Protección
Contra
Sobrecarga
2/20/200/600 V
1.5%
1 mV
10 M OHMIOS
1100 VCC o
CA Pico por
1 min
200/600 V
2%
100 mV
10 M OHMIOS
1100 VCC o
CA Pico por
1 min
200/600 V
2.5%
100 mV
10 M OHMIOS
1100 VCC o
CA Pico por
1 min
Corriente Continua
Rango 26, 7 Funciones
Rango 20, 7 Funciones
Rango 17, 5 Funciones
DM-370A
DM-360A
DM-350A
Rango
Precisión
Básica
Resolución
Carga de
Tensión
Protección
Contra
Sobrecarga
2 m/20 m/
200 mA /10 A
1.5%
1
μ
A
350 mV máx
Entrada mA de
fusible 0.5 A/
600 V sin
fusible, 11 A por
30 segundos
200
μ
A/2 m/
20 m/200 mA
1.5%
100nA
350 mV máx
Entrada mA de
fusible 0.5 A/
250 V sin
fusible, 11 A por
30 segundos
2 m/20 m/
200 mA
1%
1
μ
A
350 mV máx
Entrada mA de
fusible 0.5 A/
250 V sin
fusible, 11 A por
30 segundos
WARRANTY
ONE YEAR LIMITED WARRANTY
SPERRY INSTRUMENTS, INC. warrants that this AWS
instrument has been carefully tested, inspected, and
warranted for one (1) year from the date of purchase by
the original end user purchaser, and the instrument 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
SPERRY INSTRUMENTS, INC. Attention: Customer
Service Center, 2150 Joshua’s Path, Suite 302,
Hauppauge, NY
11788, Postage prepaid for
examination of verification of manufacturing defect
under warranty. SPERRY INSTRUMENTS, INC. shall
be the sole judge of such defect. Liability of SPERRY
INSTRUMENTS, INC. shall be limited to the repair or
!
!
DC Current
25 Range, 7 Function 20 Range, 7 Function
17 Range
Function
DM-370A
DM-360A
DM-350A
Range
Basic
Accuracy
Resolution
Input
Impedance
Overload
Protection
2m/20m/
200mA/10A
1.5%
1 uA
350 mVmax
0.5A/600V
FUSE mA
input
10A Unfused,
11A for 30 sec.
200u A/2m/
20m/200mA
1.5%
100nA
350 mVmax
0.5A/250V
FUSE mA
input
2m/20m/
200mA
1%
1 uA
350 mVmax
0.5A/250V
FUSE mA
input
Microwave Diode
For the DM-360A model only.
I
nstant Continuity
For the DM-370A and DM-360A models only.
DC Voltage
25 Range, 7 Function 20 Range, 7 Function
17 Range
Function
DM-370A
DM-360A
DM-350A
Range
Basic
Accuracy
Resolution
Input
Impedance
Overload
Protection
200mV/2/20/
200/600V
1%
100 u V
10 M OHM
1100 VDC or
peak AC for
1 min
200mV/2/20/
200/600V
1.2%
100 u V
10 M OHM
1100 VDC or
peak AC for
1 min
200mV/2/20/
200/600V
2%
100 u V
10 M OHM
1100 VDC or
peak AC for
1 min
!
Diode Test
25 Range, 7 Function 20 Range, 7 Function
17 Range,
Function
DM-370A
DM-360A
DM-350A
Test Currency
Test Voltage
1.0+/-.6mA
3.2V max
1.0+/-.6mA
3.2V max
1.0+/-.6mA
3.2V max
Corriente Alterna
Para el modelo DM-370A.
Rango
2 m/20 m/200 mA/10 A
Precisión Básica
2%
Resolución
1 uA
Carga de Tensión
350 mV máx
Protección Contra Sobrecarga
Entrada mA de fusible 0.5
A/250 V sin fusible, 11 A por 30
segundos
Tensíon Continua
Rango 26, 7 Funciones
Rango 20, 7 Funciones
Rango 17, 5 Funciones
DM-370A
DM-360A
DM-350A
Rango
Precisión
Básica
Resolución
Impedancia
de Entrada
Protección
Contra
Sobrecarga
200 mV/2/20/
200/600 V
1%
100
μ
V
10 M OHMIOS
1100 VCC o CA
Pico por
1 min
200 mV/2/20/
200/600 V
1.2%
100
μ
V
10 M OHMIOS
1100 VCC o CA
Pico por
1 min
200 mV/2/20/
200/600 V
2%
100
μ
V
10 M OHMIOS
1100 VCC o CA
Pico por
1 min
Diodo de Microondas
Para el modelo DM-360A.
Resistance
Rango 26, 7 Funciones
Rango 20, 7 Funciones
Rango 17, 5 Funciones
DM-370A
DM-360A
DM-350A
Rango
Precisión
Básica
Resolución
Protección
Contra
Sobrecarga
Prueba del
Diodo
Continuidad
Instantánea
Corriente
de Prueba
Tensión
de Prueba
200/2 K/20 K/
200 K/2 M/20 M
1%
100m OHMIOS
500VDC or AC
rms Electronic
*
*
1.0+/-.6 mA
3.2 V max
200/2 K/20 K/
200 K/2 M/20 M
1.5%
100m OHMIOS
500VDC or AC
rms Electronic
*
*
1.0+/-.6 mA
3.2 V max
200/2 K/20 K/
200 K/2 M/20 M
1.5%
100m OHMIOS
500VDC or AC
rms Electronic
*
1.0+/-.6 mA
3.2 V max
AC Current
For the DM-370A model only.
Range
20/m/20m/200mA/10A
Basic Accuracy
2%
Resolution
1 uA
Input Impedance
350 mVmax
Overload Protection
0.5A/250V FUSE mA input 10A Unfused,
11A for 30 sec.
Resistance
25 Range, 7 Function 20 Range, 7 Function
17 Range
Function
DM-370A
DM-360A
DM-350A
Range
Basic
Accuracy
Resolution
Overload
Protection
200/2K/20K/
200K/2M/20M
1%
100m OHM
500VDC or AC
rms Electronic
200/2K/20K/
200K/2M/20M
1.5%
100m OHM
500VDC or AC
rms Electronic
200/2K/20K/
200K/2M/20M
1.5%
100m OHM
500VDC or AC
rms Electronic
!
GARANTÍA
GARANTÍA LIMITADA DE UN AÑO
A. W. Sperry Instruments, Inc. certifica que este instrumento
AWS fue cuidadosamente verificado e inspeccionado y que
está garantizado por el término de un (1) año desde la fecha
de adquisición por parte de comprador final original, y que el
instrumento no haya sido empleado erróneamente, dañado
por negligencia, reparación indebida o no autorizada, o por el
uso abusivo o contrario a las instrucciones de operación. Los
instrumentos y los comprobantes de la compra, en la forma
de una copia legible o el original de la boleta de venta que
identifique claramente distribuidor, nœmero del instrumento y
fecha de la compra, deben ser devueltos a: A. W. Sperry
Instruments, Inc., Attention: Customer Service Center, 2150
Joshua’s Path, Suite 302, Hauppauge, NY 11788, Estados
Unidos, con franqueo postal pago, para que se examine el
defecto de fabricación cubierto por la garantía. A. W. Sperry
Instruments, Inc. será quien decida exclusivamente la
naturaleza de tal defecto. La responsabilidad de A. W. Sperry
Instruments, Inc. está limitada a la reparación o el reemplazo,
a su propia opción, de cualquier producto defectuoso.
NOTA:
El per’odo de calibración recomendado no debe
exceder un año. El costo del servicio de calibración no está
RANGES:
2/20/200/600V
1.5%
1 mV
10 M OHM
1100 VDC or
peak AC for
1 min
AC Voltage
25 Range, 7 Function 20 Range, 7 Function
17 Range
Function
DM-370A
DM-360A
DM-350A
Range
Basic
Accuracy
Resolution
Input
Impedance
Overload
Protection
200/600V
2%
100 mV
10 M OHM
1100 VDC or
peak AC for
1 min
200/600V
2.5%
100 mV
10 M OHM
1100 VDC or
peak AC for
1 min
11/02
Form #312
OPERATING INSTRUCTIONS
MODELS DM-350A, 360A, 370A
DIGITAL MULTIMETER
PLEASE READ THESE OPERATING
INSTRUCTIONS CAREFULLY
Misuse and or abuse of these instruments cannot be prevented by
any printed word and may cause injury and or equipment damage.
Please follow all these instructions and measurement procedures
faithfully and adhere to all standard industry safety rules and
practices.
2150 Joshua’s Path, Suite 302
Hauppauge, NY 11788
Phone:800-645-5398
www.sperryinstruments.com
WARRANTY RETURN
Refer to Section "Return for Repairs" for complete
instructions. All warranty returns must include a legible
copy or original of the sales receipt clearly identifying the
model number, serial number and date of purchase.
Sec. 1 DESCRIPTION
These DMMs offer a powerhouse of measurement
capability in a small self-contained housing. It is
designed for the professional at work in the field or in the
laboratory, yet simple enough to operate making it
perfect for the hobbyist too.
Safety was a prime consideration in the design of this
DMM. Housed in shock resistant ABS plastic, this
instrument stands up to the use and abuse of everyday
service, and electrically insulates the user from potential
shock hazards. Electronic overload protection against
accidental application of voltage to resistance and
continuity circuits, combined with it's rugged construction
make it durable and reliable instrument.
Sec. 2 FEATURES
• UL listed to both US and Canadian standards
• Pocket-size
• Simple operation
• True RMS Value Measurements (DM-370A)
• Recessed safety designed input terminals
• Overload protection on all ranges
• Diode test function
Sec. 3 SPECIFICATIONS
Display:
3-1/2 digit LCD, 0.625"
numerals, maximum
reading1999 with automatic
sign.
Overange Indication:
"1" most significant digit
shows.
Sampling Rate:
3 times per second.
Operating Environment:
0° to 50°C (32° to 122°F),
Max RH 80% to 31°C
decreasing linear to 50% RH
at 40°C.
Storage Environment:
-20° to 60°C (-4° to 140°F) at
<80% relative humidity.
Power Source:
One (1) 9V Transistor Type
Battery AWS Part #B-4
(NEDA #1604).
Power Consumption:
30mW typical.
Battery Life:
200 hours typical with zinc
carbon.
Fuse:
Part F-7; 0.5A, 250V,
5x20mm, fast acting.
Fuse:
(DM-370)
AWS Part F-31; 10A, 250V,
5x20mm, fast acting Ceramic.
Dimensions:
5.6"H x 3.1"W x 1.3"D
(143 x 79 x 33 mm).
Weight:
Approximately 5.6 oz. (160g)
including battery.
1. Disconnect the test leads from any energized circuit
and then from the instrument.
2. Turn the range switch to the "OFF" position.
3. Remove screws and open the back case.
4. Remove the battery from the compartment and
unsnap the battery connector.
5. Replace the battery with a 9V transistor type battery
(NEDA #1604), AWS Part #B-4. For maximum battery
life, alkaline cells are recommended.
6. Reverse the above procedure to complete battery
replacement.
Sec. 7 FUSE REPLACEMENT
A 0.5A, 250V, 5 x 20mm fast acting fuse, AWS Part #F-7
is installed in the instrument and used to protect the
ampere ranges along with other solid state components.
Model DM-370A also has a 10A, 250V, 5x20mm
Ceramic, fast acting fuse.
WARNING
Before attempting to replace the fuse, disconnect the
test leads from any energized circuit and then
disconnect the test leads from the instrument. Replace
the fuse the AWS Part F-7 or approved equal only.
Always use fast acting, high interrupting type fuses
1. Disconnect the test leads from any energized circuit
and then from the instrument.
2. Turn the range selector switch to the "OFF" position.
3. Remove screws and open the back case.
4. Remove the fuse from the clip on the end of the PCB.
5. Install the replacement fuse being certain it meets the
AWS Part F-7 specifications.
6. Replace the back case.
Sec. 8 OPERATION
Before making any measurements always examine the
instrument and accessories used with the instrument for
damage, contamination (excessive dirt, grease, etc.) and
defects. Examine the test leads for cracked or frayed
insulation and make sure the lead plugs fit snugly into
the instrument jacks. If any abnormal conditions exist do
not attempt to make any measurements. Instead refer
to sec.14 Return for Repairs.
Sec. 8.1 VOLTAGE MEASUREMENTS
1. Insert the black and red test leads into the respective
"COM" and "V-
Ω
" jacks.
2. Place the range selector switch into the
600DCV/600ACV position if a dc voltage is to be
measured or into the position if an ac voltage is to be
measured. Always start in the highest range of the
function to be measured.
CAUTION
To avoid possible electric shock, instrument damage
and/or equipment damage, do not attempt to take any
voltage measurements if the voltage is above 600Vdc or
if the voltage is unknown. 600Vdc is the maximum
voltages that this instrument is designed to measure.
The "COM" terminal potential should not exceed 600V
measured to ground.
3. Apply the test leads to the two points at which the
voltage reading is to be taken. Be careful not to
touch any energized conductors with any parts of
your body.
4. Turn the range selector switch to the next lower
range for a more accurate reading only if the reading
is within that next lower range.
5. When measurements are completed, disconnect the
test leads from the circuit under test. Remove the
test leads from the instrument.
True RMS Value Measurements (DM-370A)
Most of the conventional Digital Multimeters (average
responding, calibrated in RMS of a sine wave) are
designed for sine waves of small distortion only. If they
are used to measure distorted waveforms such as
chopping, square of sawtooth waveform, a large amount
of measurement error will be introduced, thus making it
impossible to take accurate measurement of True RMS
values. The model DM-307A with True RMS capability
provides accurate measurement of True RMS values
regardless of the waveform. It also permits measurement
of AC only of AC plus DC coupled Current and voltage.
Here reference is made to the crest factor which is
defined to be the ratio of True RMS value to the peak
value as represented by the following formula:
Crest Factor = Peak Value
True RMS Value
The crest Factor for model DM-370 is 3. This means that
a maximum voltage value to be measured is 3 times the
rated scale value of each range.
Sec. 8.2 CURRENT MEASUREMENTS
1. Insert the black and red test leads into the respective
"COM" and "mA" terminals.
2. Place the function switch to the 200mA position.
Always start with the highest range of the function to
be measured.
CAUTION
Do not attempt to take a current measurement if the
current is unknown or above 200mA. The "COM"
terminal potential should not exceed 500V measured to
ground.
3. Completely de-energize the circuit in which the
current is to be measured. Place the DMM in series
with the conductor carrying the current which is to be
measured. Energize the circuit.
CAUTION
Before changing ranges, always de-energize the circuit
completely. An open circuit exists between the test leads
during range change on the DMM.
CAUTION
The mA ranges are fuse protected. To avoid possible
electrical shock, instrument damage and/or equipment
damage do not:
1. Attempt to take mA current readings on circuits
having more than 200mA current flow.
2. Impress a voltage between the "COM" and "mA"
terminals exceeding 250Vac/dc. Some circuit
damage may result for voltages below 250Vac/dc.
3. Raise the "COM" terminal potential above 500V to
ground.
4. Energize the circuit. If the reading is within the next
lower range, switch to that range after completely de-
energizing the circuit under test. Continue changing
to lower ranges if the reading is within the next lowest
range to obtain the best accuracy.
5. Completely de-energize the circuit before removing
the test leads.
Sec. 8.3 RESISTANCE AND DIODE MEASUREMENTS
1. Insert the black and red test leads into the respective
"COM" and "V-
Ω
" terminals.
2. Place the range selector switch into the
Ω
range
desired for a measurement. (The test range
measures resistance from 000 up to 1999 and is
used to test the forward resistance value of diodes.
The diode check entails injecting a given current into
the diode juction to be tested and reading the voltage
drop across the diode. Models DM-350A, DM-370A
CAUTION
All resistance and diode measurements should be taken
on de-energized circuits only. To avoid possible
electrical shock, instrument damage and/or equipment
damage do not connect the "COM" and "V-
Ω
" terminals
to circuits having a potential difference exceeding
250Vdc/ac. Do not connect the "COM" terminal to
potentials exceeding 500V to ground.
3. Completely de-energize the circuit or device which is
to be measured. Connect the test leads to the device
(the red test lead is positive with respect to the black
test lead). When measuring a diode, connect the "V-
Ω
" terminal to the anode. A reading of indicates an
overrange condition. This will occur with the test
leads open on all resistance ranges. If overrange
occurs when taking a reading, switch to the next
highest range.
NOTE:
On the diode test range, a [1] reading indicates a
resistance greater than 2K which normally means a
defective open circuit diode. Be certain the diode anode
is connected to the V-
Ω
terminal.
Sec. 9 MAINTENANCE
Maintenance consists of periodic cleaning, battery
replacement, fuse replacement and recalibration.
Sec. 9.1 CLEANING
The exterior of the instrument can be cleaned with a soft
clean dry cloth to remove any oil, grease or grime from
the exterior of the instrument. Never use liquid solvents
or detergents. If the instrument gets wet for any reason,
dry the instrument using low pressure "clean" air at less
than 25 PSI. Use care and caution around the LCD
display protector and areas where water or air could
enter the interior of the instrument while drying.
Sec. 10 ACCESSORIES
The following accessories is available for the DM-350A.
C-102 Rubber Holster and C-65 Carrying Case
Sec. 11 CALIBRATION
Calibration on these meters should be performed every
year. This can be done by sending the instruments
prepaid to:
Sperry Instruments, Inc.
Customer Service Department
2150 Joshua’s Path, Suite 302
Hauppauge, NY 11788
Specify in writing that calibration is necessary. The
instrument will be returned to you normally within one
week. Estimates will be furnished upon request.
CAUTION
The following procedures should performed by persons
trained and qualified in electronics and electronic
equipment service. DO NOT attempt this procedure if
not qualified.
WARNING
Do not attempt calibration or service unless another
person capable of rendering first aid and resuscitation is
present.
Sec. 12 RETURN FOR REPAIRS
Before returning your digital multimeter for repair be sure
tocheck that the failure to operate properly is not due to
thefollowing:
1. Weak battery
2. Open fuse
3. Open, loose or intermittent test leads
If these conditions do not exist and the instrument fails
tooperate properly, return the instrument and
accessories prepaid to:
Sperry Instruments, Inc.
Customer Service Department
2150 Joshua’s Path, Suite 302
Hauppauge, NY 11788
State in writing what is wrong with the instrument. All
warranty repairs must include proof of purchase in the
form of a legible original copy of the sales receipt clearly
identifying the distributor, model number and date of
purchase. Repair estimate will be furnished if requested
for out of warranty instruments. Be sure to include all
accessories which may be related to the problem and a
note describing the malfunction you observed.
Sec. 4 SAFETY RULES
1.
Read these operating instructions thoroughly and
completely before operating your DMM. Pay
particular attention to WARNINGS and CAUTIONS
which will inform you of potentially dangerous
procedures. These instructions must me followed.
2.
Always inspect your DMM, test leads and
accessories for any sign of damage or abnormally
before every use. If any abnormal conditions exist
(e.g. broken test leads, cracked cases, display not
reading, etc.),
do not attempt to take any measurements. Refer to
section 12 Return for Repair.
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.
Never touch exposed wiring, connections or any
live circuit conductors when attempting to take
measurements.
5.
Never replace the protective fuse inside the DMM
with any other than the AWS Part number specified or
approved equal.
6.
Remember: Think Safety and Act Safely.
7.
When testing for the presence of voltage, make sure
the voltage function is operating properly by reading
a known voltage in that range before assuming that
a zero reading indicates a no-voltage condition.
8.
Calibration and repair should be performed by
qualified maintenance personnel only.
9.
Do not attempt calibration or service unless another
person, capable of rendering first aid and
resuscitation is present.
10. Do not install substitute parts or perform any
unauthorized modification of the instrument. Return
the instrument to SPERRY INSTRUMENTS for
service and repair to insure that safety features are
maintained.
11. To avoid electric shock use CAUTION when working
with voltages above 40Vdc or 20Vac. Such voltages
pose a shock hazard.
12.
Do not operate this instrument in an explosive
atmosphere (i.e. in the presence of flammable gases
or fumes, vapor or dust).
Sec. 5 PREPARATION FOR USE
Sec. 5.1 UNPACKING AND CONTENTS CHECK
The DM-350A comes complete and ready to use. Check
the following contents list when unpacking. If any pieces
are missing notify the distributor you purchased the
instrument from or A.W. Sperry Instruments, Inc.
• Operating Instructions #312
• Test Leads TL-76 (one black, one red)
• 9V Transistor Type Battery (AWS Part #B-4)
• One Fuse installed
Sec. 5.2 PRE-OPERATION PROCEDURE
1. Install the 9V transistor type battery.
2. Inspect the instrument for any external defects by
comparing with the diagram on page 1. If any
abnormal conditions exist, do not attempt to take any
measurements. Refer to sections 9 (Maintenance)
and 12 (Return for Repairs).
3. Insert the test leads into the "COM" and "V-
Ω
" jacks.
Connect the two ends of the test leads together.
4. Place the range selector switch into the off position.
Nothing will appear on the display. Place the range
selector switch into the following ranges shown in the
chart below. Check for the appropriate meter response.
Range
Display Reading
600DCV
000
+/-4 digits
200DCV
00.0
"
20DCV
0.00
"
2DCV
.000
200
1_ _.
2K 1.
20K
1_.
200K
1_ _.
5. As you can see, the decimal point moves as the
ranges are changed. The maximum display reading
is 1999. The 200DCV range will actually only read
199.9Vdc. We call this the 200DCV range for
convenience only.
6. You can now check the decimal point on each range
by referring to sec. 3 Specifications where the ranges
are all listed. Refer to the Range and Resolution
columns to compute the decimal point location.
7. If any abnormal conditions exist, do not attempt to
take any electrical measurements. Instead refer to
sec. 12 Return for Repairs.
Sec. 6 BATTERY REPLACEMENT
The DM-350A has a self-contained power supply
consisting of One 9V Transistor Type Battery (NEDA
#1604, AWS Part #B-4).
WARNING
Before attempting to replace the battery, first disconnect
the test leads from any energized circuit and then
disconnect the test leads from the instrument.
11/02
Formulario N° 312
INSTRUCCIONES DE
OPERACIÓN
MODELO DM-350A, 360A, 370A
MULTIMETRO DIGITAL
POR FAVOR LEA ESTAS
INSTRUCCIONES DE OPERACIÓN
CUIDADOSAMENTE
El mal uso o abuso de estos instrumentos no puede ser evitado
mediante ninguna instrucción escrita y puede causar lesiones y/o
daños al equipo. Por favor siga fielmente estas instrucciones y los
procedimientos de medición y aplique todas las normas y prácticas
de seguridad industriales estándar.
A.W. SPERRY INSTRUMENTS INC.
The Professional’s Choice™
245 MARCUS BLVD., HAUPPAUGE, NY 11788
ESTADOS UNIDOS
Teléfono: Llamadas sin cargo 1-800-645-5392
o con cargo el 1-631-231-7050
Fax:1-631-434-3128
Содержание DM-350A
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