Greenlee DM-50 Bedienungsanleitung
999 3790.5 © 2004 Greenlee Textron IM 1465 REV 1 1/
04
DM-50 • DM-55
Digital
Multimeters
Multimetros
Digitales
Multimetres
Numeriques
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 estas herramientas o darles 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-50 and DM-55 Digital Multimeters are hand-held
testing devices with the following measurement capabilities: AC and DC
voltage, DC current, and resistance. The units also check diodes.
The DM-50 also tests 1.5 V and 9 V batteries. The DM-55 also measures
temperature (K-type thermocouples) and verifies continuity. In addition,
the units feature a 3-1/2–digit LCD, manual range selection, overload
protection, and permanently connected leads and probes which can be
stored on the protective boot.
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
This instruction manual is intended to familiarize all personnel with the
safe operation and maintenance procedures for Greenlee DM-50 and
DM-55 Digital Multimeters.
Keep this manual available to all personnel. Replacement manuals are
available upon request at no charge.
KEEP THIS MANUAL
All specifications are nominal and may change as design improvements
occur. Greenlee Textron shall not be liable for damages resulting from
misapplication or misuse of its products.
DM-50 • DM-55
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.
4
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
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.
DM-50 • DM-55
5
Important Safety Information
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 or any uninsulated portion of
the accessory.
Failure to observe these warnings could result in severe injury or
death.
• 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.
The fuse is an integral part of the overvoltage protection. When
fuse replacement is necessary, see 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.
6
Important Safety Information
• Unless measuring voltage or current, 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. Incorrect settings or
connections can result in a blown fuse.
• Using this unit near equipment that generates electromagnetic
interference can result in unstable or inaccurate readings.
• 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. See Specifications.
Failure to observe these precautions may result in injury and can
damage the unit.
Do not change the measurement function or range 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.
DM-50 • DM-55
7
Identification
1. Display
2. Selector to select a
function or turn
power off
3. Thermocouple input
for K-type thermo-
couple (DM-55 only)
4. Permanently
attached test leads
and probes
Display Icons
5. HV 200.0 V or 300 V AC
or DC range selected
(DM-50 only)
6. – Polarity
7. Low battery
Symbols on the Unit
Warning—Read the instruction manual
Battery
Double insulation
3
4
2
1
5
6
7
8
Electric shock hazard:
Contact with live circuits could result in
severe injury or death.
Operation
1. Set the selector according to the Settings Table.
Start with the highest measurement setting.
2. See Typical Measurements for illustrations of typical uses.
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. See the address shown under Warranty.
4. Take the reading from the circuit or component to be tested. If the
resolution is not satisfactory, remove the leads from the circuit and
change to the next lower range.
DM-50 • DM-55
9
Operation (cont’d)
Settings Table
* Connect the unit in series with the test object and then
switch the test object on.
** Tone sounds if the measured resistance is less than
approximately 30 Ω.
*** The DM-55 has a built in sensor that measures ambient
temperature and operates in the range of 32 °F to 104 °F.
An external K-type thermocouple can be plugged into the
thermocouple input. See the Accuracy section for ranges
and accuracies.
To measure this set the selector
characteristic … to this symbol …
DC Voltage V
AC Voltage V
DC Current* mA
(DM-50)
DC Current* A
(DM-55)
Resistance Ω
Continuity**
(DM-55)
Diode
Battery BATT TEST
(DM-50)
Temperature*** TEMP
(DM-55)
10
Typical Measurements
Current Measurement
Voltage
Measurement
Dieses Handbuch passt für folgende Modelle
1
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