Greenlee DM-45 User manual

Read and understand all of the instructions and safety information in this manual
before operating or servicing this tool.
DM-45
Digital Multimeter
INSTRUCTION MANUAL

2
Description
The Greenlee DM-45 Digital Multimeter is a hand-held testing device with the following measurement
capabilities: AC and DC voltage, AC and DC current, temperature (K-type thermocouples only),
frequency, duty cycle, resistance, and capacitance. This meter also checks diodes and verifies
continuity.
Other specialized capabilities and functions include:
•Backlighted LCD for reading in dim conditions.
•Relative zero mode.
•Data hold mode.
•Automatic power off.
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-45 Digital Multimeter.
Keep this manual available to all personnel.
Do not discard this product or throw away!
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.
KEEP THIS MANUAL

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SAFETY ALERT SYMBOL
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.
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.
Electric shock hazard:
Contact with live circuits could result in severe injury or death.
Important Safety Information

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. Refer to 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. Destroy test leads and replace immediately if the contrasting inner layer
of insulation is visible.
•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:
•The test leads supplied with this product comply with IEC 61010-031:2008, UL 61010-031:2010
and CAN/CSA-C22.2 NO. 61010-031A-07–Amendment 1:2010. These safety standards limit the
exposed length of the probe tip to 4 mm for measurement categories III and IV. These test leads
include a cap that must be in place when used in measurement category III or IV applications.
•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.
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.

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Important Safety Information
Electric shock hazard:
The fuses are 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, 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.
Failure to observe these warnings could result in severe injury or death.
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.
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.

6
Identification
1. Display 4000-count LCD
2. Feature buttons Refer to explanations in the “Using the Features” section.
3. Selector Selects a function or turns power OFF.
4. 10A Positive input terminal for high current measurements.
5. COM Negative, common, or ground input terminal for all measurements.
6. INPUT Positive input terminal for all measurements except high current.
Display Icons
7. Low battery
8. 8.8.8.8 Numeric display
9. DC measurement is selected.
10. AC measurement is selected.
11. –Polarity indicator
12. Hold function is enabled.
13. REL Relative zero function is enabled.
14. AUTO Automatic ranging is enabled.
15. Diode
16. Continuity
17. %Duty cycle function is enabled.
18. kKilo (103)
19. MMega (106)
20. ΩOhm
21. Hz Hertz (frequency in cycles per second)
22. nNano (10-9)
23. mMilli (10-3)
24. µMicro (10-6)
25. FFarad
26. AAmpere
27. VVolt
28. °C °F Celsius or
Fahrenheit indicator
Symbols on the Unit
Warning—Read the instruction manual
Risk of electric shock
Battery
Fuse
Double insulation
3
2
1
4 5 6
14
13
12
11
10
9
15
78 28
16 17 18–21 22–27

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Using the Features
•RANGE: Press once to enter the manual ranging mode. “AUTO” will disappear from the display.
Press repeatedly to step through the ranges. Press and hold to return to the automatic ranging mode.
•Hz %: Press momentarily to toggle between frequency and duty cycle functions. This button is active
only when the selector is set to Hz/%.
•REL: Finds the difference between two measurements. While taking a measurement, press REL to
set the display to zero. “REL” will appear on the display. Take the second measurement. The value on
the display will be the difference between the two measurements. Press again to exit this mode.
•HOLD: Press momentarily to hold the present value on the display. Press again to exit this mode.
• :Press and hold until backlight illuminates. Press and hold again to turn off.
• :Press momentarily to toggle between functions.
•Automatic Power Off: To extend battery life, the meter will shut itself off after approximately
15minutes of inactivity. To restore power, press any button or turn the selector to OFF and then back
on. To disable this feature, press any button while turning the meter on.
Using the Test Leads
Electric shock hazard:
The test leads supplied with this product comply with IEC 61010-031:2008, UL 61010-031:2010 and
CAN/CSA-C22.2 NO. 61010-031A-07–Amendment 1:2010. These safety standards limit the exposed
length of the probe tip to 4 mm for measurement categories III and IV. These test leads include a cap
that must be in place when used in measurement category III or IV applications.
Failure to observe this warning could result in severe injury or death.
CAT IV 600V
CAT III 1000V
CAT II 1000V
CAT IV 600V
CAT III 1000V
Cap can be removed for measurement category I or II applications.
Cap must be in place for
measurement category III
or IV applications.

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, press (when instructed to
doso), and connect the test leads to the meter.
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.
4. Take the reading from the circuit or component to be tested.

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Settings Table
To measure this
characteristic …
Set the
selector to this
symbol…
These icons will
appear on the
display …
Connect
the red
lead to…
Connect
the black
lead to …
DC Voltage (600 V max) Vand VINPUT COM
AC Voltage (600 V max) Vand VINPUT COM
Resistance Ω MΩ INPUT COM
Continuity* /
and press
and ΩINPUT COM
Diode and V
Capacitance** AUTO and nF INPUT COM
Frequency Hz/% and
press Hz %
AUTO and Hz INPUT COM
Duty Cycle %
Temperature Temp
°C or °F
(press to
change scale)
INPUT COM
Current (4000 µA max)† µA AUTO
µA, or INPUT COM
Current (400 mA max)† mA AUTO
mA, or INPUT COM
Current (10 A max)† AAUTO
A, or 10A COM
* Tone indicates continuity. The threshold is between 20 Ω and 150 Ω.
** Discharge capacitor before measurement. Discharge a large capacitor through an appropriate
resistive load.
† Press for AC or DC, as required.
Operation (cont’d)

10
Typical Measurements
Current Measurement
AC Voltage Measurement DC Voltage Measurement

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Typical Measurements
Continuity Check
Capacitance Measurement Diode Measurement
Resistance Measurement
Reverse
Bias
Forward
Bias

12
Typical Measurements
Temperature

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Accuracy
Refer to the “Specifications” section 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 75% relative humidity.
Accuracy is specified from 5% to 100% of the range unless noted otherwise.
AC Voltage DC Voltage
Range
(40 Hz to 400 Hz) Accuracy Range Accuracy
4.000 V ± (0.8% + 0.005 V) 400.0 mV ± (0.8% + 0.5 mV)
40.00 V ± (1.2% + 0.05 V) 4.000 V ± (0.8% + 0.005 V)
400.0 V ± (1.2% + 0.5 V) 40.00 V ± (0.8% + 0.05 V)
600 V* ± (1.2% + 5 V) 400.0 V ± (0.8% + 0.5 V)
Input Impedance: 10 MΩ, < 100 pF 600 V* ± (1.0% + 5 V)
* 600 V range is specified from 20% to 100%
ofrange.
Input Impedance:
400 mV Range: > 100 MΩ
Other Ranges: 10 MΩ, < 100 pF
* 600 V range is specified from 20% to 100%
ofrange.
Resistance Diode Test
Measuring Range: 2.000 V
Test Current (typical): 0.8 mA
Open Circuit Voltage (typical): < 3 V
Continuity
Tone Threshold: Between 20 Ω and 150 Ω
Range Accuracy
400.0 Ω ± (1.0% + 0.5 Ω)
4.000 kΩ ± (1.0% + 0.005 kΩ)
40.00 kΩ ± (1.0% + 0.05 kΩ)
400.0 kΩ ± (1.0% + 0.5 kΩ)
4.000 MΩ ± (1.5% + 0.005 MΩ)
40.00 MΩ ± (3.0% + 0.10 MΩ)
Open Circuit Voltage: < 0.7 VDC

14
AC Current
Range (40 Hz to 400 Hz) Accuracy Burden Voltage (typical)
400.0 µA ± (1.8% + 1.0 µA) 51 µV/µA
4000 µA ± (1.8% + 10 µA)
40.00 mA ± (1.8% + 0.10 mA) 2.7 mV/mA
400.0 mA ± (1.8% + 1.0 mA)
4.000 A ± (2.5% + 0.010 A) 0.04 V/A
10.00 A* ± (2.5% + 0.10 A)
* 2 A continuous, > 2 A to 10 A for 10 second max with 15 minutes cool down interval.
10.00 A range is specified from 20% to 100% of range.
DC Current
Range Accuracy Burden Voltage (typical)
400.0 µA ± (1.0% + 0.7 µA) 51 µV/µA
4000 µA ± (1.0% + 7 µA)
40.00 mA ± (1.0% + 0.07 mA) 2.7 mV/mA
400.0 mA ± (1.0% + 0.7 mA)
4.000 A ± (1.5% + 0.007 A) 0.04 V/A
10.00 A* ± (1.5% + 0.07 A)
* 2 A continuous, > 2 A to 10 A for 10 second max with 15 minutes cool down interval.
10.00 A range is specified from 20% to 100% of range.
Frequency Duty Cycle
Range: 5% ~ 95%
Accuracy: ± (2% + 0.7)
Input Voltage: 4 V ~ 10 V peak to peak
Frequency Range: 4 Hz ~ 1 kHz
Range Accuracy
9.999 Hz ± (1.0% + 0.005 Hz)
99.99 Hz ± (1.0% + 0.05 Hz)
999.9 Hz ± (1.0% + 0.5 Hz)
9.999 kHz ± (1.0% + 0.005 kHz)
99.99 kHz ± (1.0% + 0.05 kHz)
999.9 kHz ± (1.0% + 0.5 kHz)
9.999 MHz Unspecified
Input Voltage: 1 V rms ~ 20 V rms
Accuracy (cont’d)

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Accuracy (cont’d)
Capacitance
Range Accuracy
40.00 nF ± (3.5% + 0.20 nF)
400.0 nF ± (2.5% + 0.5 nF)
4.000 µF ± (3.5% + 0.005 µF)
40.00 µF ± (4.0% + 0.05 µF)
200.0 µF ± (5.0% + 0.5 µF)
Press REL before connecting test leads to capacitor.
This compensates for test lead capacitance.
Accuracies are for film capacitors (capacitors with negligible
dielectric absorption); measurements of larger capacitors
can take up to 10 seconds.
Temperature
Range Accuracy
°C
–20 °C ~ 0 °C ± (6.0% + 5 °C)
0 °C ~ 400 °C ± (1.5% + 4 °C)
400 °C ~ 1000 °C ± (1.8% + 5 °C)
°F
–4 °F ~ 32 °F ± (6.0% + 9 °F)
32 °F ~ 752 °F ± (1.5% + 7.2 °F)
752 °F ~ 1832 °F ± (1.8% + 9 °F)
K-type thermocouple range and accuracy not included.
Thermocouple supplied with meter is rated –50 °C to 204 °C (–58 °F to 400 °F).
Accuracy is ±2.5 °C (4.5 °F) or 0.75% of reading, whichever is greater.
Accuracy specification assumes ambient temperature is between 18 °C and 28 °C
and is stable to ±1 °C. For ambient temperature changes of ±5 °C, rated accuracy
applies after 1 hour.

16
Specifications
Display: 4000-count LCD
Polarity: Automatic
Numeric Display Sampling Rate: 3 per second
Temperature Coefficient: Nominal 0.2 x (specified accuracy) per °C
below 18 °C or above 28 °C
Automatic Power Off: After 15 minutes of inactivity.
To disable this feature, press any button while turning the meter on.
Operating Conditions:
Temperature: 0 °C to 40 °C (32 °F to 104 °F)
Relative Humidity (non-condensing): 75% maximum for temperatures up to 31 °C (88 °F),
decreasing linearly to 50% maximum at 40 °C (104 °F)
Altitude: 2000 m (6500') maximum
Indoor use only
Pollution Degree: 2
Storage Conditions:
Temperature: –10 °C to 50 °C (14 °F to 122 °F)
Relative Humidity (non-condensing): 0% to 85%
Remove battery.
Battery: One 9 V battery (6F22)
Overload Protections:
Input Terminal: 400 mA/600 V fast-acting fuse, minimum interrupting rating 20 kA,
13/32" x 1-1/2" or 13/32" x 1-3/8"
10A Terminal: 10 A/600 V fast-acting fuse, minimum interrupting rating 20 kA, 13/32" x 1-1/2"
Overvoltage Category: Category III 600 V
E.M.C: Meets EN61326-1:2006 (EN55022, EN61000-3-2, EN61000-3-3, EN61000-4-2,
EN61000-4-3, EN61000-4-4, EN61000-4-5, EN61000-4-6, EN61000-4-8, EN61000-4-11)

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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 exam-
ples 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 9001 (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).

18
Maintenance
Electric shock hazard:
Before opening the case, remove the test leads from the circuit and shut off the unit.
Failure to observe this warning could result in severe injury or death.
Electric shock hazard:
The fuses are 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.
Replacing the Battery
1. Disconnect the unit from the circuit. Turn the unit OFF.
2. Remove the screws from the battery cover.
3. Remove the battery cover.
4. Replace the battery (observe polarity).
5. Replace the battery cover and screws.
Replacing the Fuses
1. Disconnect the unit from the circuit. Turn the unit OFF.
2. Remove the rubber boot.
3. Remove the screws from the battery cover.
4. Remove the battery cover.
5. Remove the screws from the back cover.
6. Remove the back cover.
7. Replace the fuse(s).
8. Replace the back cover and screws, battery cover and screws, and rubber boot.
Cleaning
Periodically wipe the case with a damp cloth and mild detergent; do not use abrasives or solvents.
Battery
Cover
Battery
Fuses
Back
Cover