Greenlee DM-100 User manual

999 3788.3 © 2000 Greenlee Textron IM 1463 REV 1 12/00
DM-100 • DM-110
DIGITAL
MULTIMETERS
MULTÍMETROS
DIGITALES
MULTIMETRES
NUMERIQUES
INSTRUCTION MANUAL
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-100 and DM-110 Digital Multimeters are hand-held testing devices with the
following measurement capabilities: AC and DC voltage, AC and DC current, and resistance.
They also check diodes and verify continuity. In addition, the DM-110 measures frequency and
capacitance. The DM-110 is a true RMS reading meter.
Both models feature automatic power off to conserve the batteries and a bar graph display
which is more sensitive than the numeric display—useful for detecting faulty contacts,
potentiometer clicks, and signal spikes.
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-100 and DM-110 Digital Multimeters.
Keep this manual available to all personnel.
Replacement manuals are available upon request at no charge.
Greenlee and are registered trademarks of Greenlee Textron.
KEEP THIS MANUAL

DM-100 •DM-110
3
Important Safety Information
Read and understand this material before operating or servicing
this equipment. Failure to understand how to safely operate this
tool can result in an accident causing serious injury or death.
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
Important Safety Information
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.
• Use test leads or accessories that are appropriate for the application. See the
category and voltage rating of the test lead or accessory.
• Inspect the test leads or accessory 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 can 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 can result in severe injury or death.
Electric shock hazard:
Contact with live circuits can 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 or any uninsulated portion of the accessory.
Failure to observe these warnings can result in severe injury or death.

DM-100 •DM-110
5
Important Safety Information
• 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 can result in injury and can damage the unit.
Do not change the measurement function while the test leads are connected to a
component or circuit.
Failure to observe this precaution can result in injury and can damage the unit.
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 can result in severe injury or death.
• Unless measuring voltage, current, or frequency, 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.

6
Identification
1. Display 4-digit LCD and bar graph
2. Function Buttons See explanations under Using the Features
3. Selector Selects a function or turns power OFF
4. Hz Positive input terminal for all measurements except 10 A current
VΩµA(Hz on DM-110 only)
5. COM Negative, common or ground input terminal for all measurements
6. 10A Positive input terminal for current measurements up to 10 A
1
2
5
6
3
4
Symbols on the Unit
Warning—Read the instruction manual
Battery
Fuse
Double insulation

DM-100 •DM-110
7
Display Icons
Both Models
7. Manual range is selected
8. DC measurement is selected
9. AC measurement is selected
10. Low battery
11. APO Auto Power Off is enabled
12. Diode
13. Continuity is selected
14. µMicro (10
-6
)
15. m Milli (10
-3
)
16. V Volts
17. A Amps
18. M Mega (10
6
)
19. k Kilo (10
3
)
20. ΩOhms
21. Hz Hertz (frequency
or cycles per
second)
7
9
8
10
22
14,15,16,17
18,19,20,21
12 1311
7
8910
1123 12
13
14,15,16,17
24,25,26,27
18,19,20,21
DM-100 Only
22. Hold function is enabled
DM-110 Only
23. Hold function is enabled
24. n nano (10
-9
)
25. µMicro (10
-6
)
26. m Milli (10
-3
)
27. F Farads
Note: Unidentified icons are not used
on these models.
DM-100 display
DM-110 display

8
AC Measurement
AC measurements are usually displayed as RMS (root-mean-square) values. Two AC
measurement methods are average-responding RMS calibrated and true RMS-reading.
The average-responding RMS calibrated method takes the average value of the input signal,
multiplies it by 1.11, and displays the result. This method is accurate if the input signal is a
pure sine wave. The Greenlee DM-100 is an average-responding meter.
The true RMS-reading method uses internal circuitry to read the true RMS value. This method
is accurate, within the specified crest factor limitations, whether the input signal is a pure sine
wave, a square wave, triangle wave, half wave or signal with harmonics. The ability to read
true RMS provides much more measurement versatility. The Greenlee DM-110 is a true RMS
meter.
The Waveforms and Crest Factors table shows some typical AC signals and their RMS values.
Waveforms and Crest Factors
*The crest factor is the ratio of the peak value to the RMS value; it is represented by the
Greek letter ξ.
Waveform
RMS Value 100 100 100 100
Average Value 90 100 87 64
Crest Factor* 1.414 1 1.73 2
(ξ)

DM-100 •DM-110
9
Button Press momentarily to: Notes:
Blue •select AC or DC when
(no label) measuring current or voltage
•select secondary functions
RANGE •change from autoranging Press and hold to change from
to manual ranging manual ranging to autoranging.
•select ranges when using
the manual ranging mode
•select trigger levels when
measuring frequency
PWR RST turn power back on after auto
(DM-100 only) power off
Hz view the frequency while While in the Hz mode, the RANGE
(DM-110 only) measuring AC voltage or button does not change the
current frequency range. However, it changes
the voltage range.
HOLD hold a measured value for all Conversions are made but the display
functions. Press again to does not update.
return to normal mode
Using the Features

10
Operation
1. See the Settings Table. Set the selector to the proper setting, press the unlabeled blue
button to select the desired measurement, and connect the test leads to the meter. Start
with the highest measurement setting.
2. See 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 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 meter from the circuit and change to the next lower range if using
manual ranging.