Greenlee DM-860 Manual de usuario

DM-860

Digital Multimeter

Multímetro digital

Multimètre

numérique

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.

Description

The Greenlee DM-860 Digital Multimeter is a hand-held testing device with the following

measurement capabilities: AC and DC voltage, AC and DC current, percent of loop current, two

channels of temperature (K-type thermocouples), frequency, duty cycle, resistance, and

capacitance. It also checks diodes and verifies continuity.

The DM-860 warns the user with a beep and an error message on the LCD if the test lead is

plugged into the mA/µA or A input terminal while the selector switch is not in the mA/µA or A

position. The meter features a bar graph display that responds more quickly than the numeric

display—useful for detecting faulty contacts, potentiometer clicks, and signal spikes. An

optional optical RS-232 computer interface and software facilitates the recording of readings

from the meter to a computer.

Other specialized functions and capabilities include:

• AC bandwidth to 100 kHz for voltage or 10 kHz for current

• MAX/MIN function which stores the maximum, minimum, and difference

• Crest capture mode to capture voltage or current signal peaks

• Selectable between 50,000 or 500,000 counts resolution when measuring

DC voltage or frequency

• Relative zero mode

• Automatic or manual ranging

• Intelligent automatic power off

• Backlighted LCD for reading in dim conditions

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-860 Digital Multimeter.

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.

® Registered: The color green for electrical test instruments is a registered trademark of Greenlee Textron.

DM-860

Important Safety Information

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.

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.

Electric shock hazard:

Contact with live circuits could result in severe injury or death.

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 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.

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.

DM-860

Important Safety Information

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.

See Specifications.

Failure to observe these precautions may result in injury and can damage the unit.

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:

The fuses are 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.

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.

Identification

1. LCD and bar graph display

2. Feature buttons (see explanations under Using the Features)

3. Selector to select a function or turn power off

4. Positive input terminal for high current measurements; negative input terminal for T2

5. Positive input terminal for low current measurements; positive input terminal for T2

6. Negative, common, or ground input terminal for all measurements

7. Positive input terminal for all measurements except current

4 7

DM-860

Display Icons

8. Automatic Ranging is enabled.

9. Hold function is enabled.

10. DC measurement is selected.

11. AC measurement is selected.

12. –Polarity indicator

13. Low battery

14. Continuity

15. ∆Relative Zero function is enabled.

16. Crest Capture function is enabled.

17. Unit is saving MIN/MAX.

18. MAX Maximum mode is enabled.

19. T1-T2T1, T2, or T1-T2function is enabled.

20. MIN Minimum mode is enabled.

21. % Duty cycle or loop current percent function is enabled.

22. M Mega (106)

23. k Kilo (103)

24. ΩOhm

25. Hz Hertz (frequency in

cycles per second)

26. dBm Decibel, referenced

to 1 milliwatt

27. m Milli (10-3)

28. µMicro (10-6)

29. V Volts

30. A Amps

31. n Nano (10-9)

32. F Farads

33. Bar graph element

34. Overload (bar graph display)

35. 5.00059 Numeric display

OL Overload

C, F Temperature unit

Symbols on the Unit

Warning—Read the instruction manual

Double insulation

10 11

12 13

1617 33

18 19 20 21 3422–32

Note: Unidentified icons are

not used on this model.

Using the Features

•Selector Turn to the desired setting, which turns the meter on. Use in combination with

pushbuttons to choose a function or mode. Turn to OFF to turn meter off.

•Intelligent Automatic Power Off (APO) To extend battery life, the meter shuts itself off

after approximately 17 minutes of inactivity. Inactivity occurs when buttons are not pressed

or the selector is not turned. The meter will not enter APO when there are significant

readings of over 10% of the range or non-OL readings for resistance and continuity. To

restore power, press REC or turn the selector to OFF and back on again. To disable this

feature, press RANGE while turning the meter on.

•Default Settings The last used setting becomes the default when that function is selected

again. To change the default, select a new setting. The setting will be stored in nonvolatile

memory.

•REC Press momentarily to begin recording the input. “MAX MIN”and will appear on

the display. The meter beeps whenever the minimum or maximum is updated. When using

the MAX/MIN function, press momentarily to cycle through the maximum, minimum, and

difference (MAX –MIN). Press and hold to exit this mode.

Note: The Automatic Power Off feature is disabled when using this function.

•CREST Press momentarily to capture the crests of AC or DC voltage or current. and

“MAX”will appear on the display. The meter will capture and hold a signal peak with a

duration as short as 8 ms. The meter beeps whenever the minimum or maximum is

updated. Press momentarily to cycle through the maximum crest, minimum crest, and

maximum –minimum crest (peak to peak). Press and hold to exit this mode.

Note: The Automatic Power Off feature is disabled when using this function.

•∆(Relative Mode) Finds the difference between two measurements. While taking a

measurement, press ∆to set the display to zero. The ∆icon 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.

•500000 Press to toggle between 50,000 counts fast mode and the 500,000 counts high

resolution mode for DC voltage and frequency measurements.

•(Backlight) Press and hold SELECT until LCD illuminates. The lamp turns off after 30

seconds to extend battery life.

•dBm-Ω/T1-T2Press RANGE momentarily to select the reference impedance for the dBm

reading or to change the thermocouple functions.

•%4-20mA Press Hz for 1 second or more to display the loop current percentage value

with 0.01% resolution. A reading of 4 mA equals 0% and 20 mA equals 100%. The bar

graph displays the current in mA. The meter must be set for DC mA to use this feature.

DM-860

Using the Features (cont’d)

•SELECT Press momentarily to toggle between functions, or to toggle between AC, DC, and

DC + AC when measuring current and voltage.

•RANGE Press once to enter the manual ranging mode. The icon will disappear from

the display. Press repeatedly to step through the ranges. Press and hold to return to the

automatic ranging mode.

Note: Manual ranging mode is not available in Hz function.

•Hz Press to measure frequency when the meter is set to read voltage or current.

Note: The sensitivity of the frequency measurement function varies with the measurement

range. To automatically select a sensitivity level, measure the voltage level first and then

press

. If the reading becomes unstable or if the display is blank, manually change

the sensitivity by momentarily pressing

RANGE

•HOLD Press momentarily to hold the present value on the display. Press again to exit

this mode. This feature does not affect the bar graph.

•Beeper The unit normally beeps when any feature button is pressed. To disable, press

Hz while turning the meter on to disable the pushbutton beeper.

Note: The continuity beeper and input error warning features remain enabled.

Waveform

RMS Value 100 100 100 100

Average Value 90 100 87 64

Crest Factor* 1.414 1 1.73 2

(ξ)

AC Measurement

AC measurements are usually displayed as RMS (root mean square) values. The RMS value is

equal to the value of a DC waveform, which would deliver the same power if it replaced the

time-varying waveform. 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

after full wave rectification, multiplies it by 1.11, and displays the result. This method is

accurate if the input signal is a pure sine wave.

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, square wave, triangle wave, half wave, or signal with harmonics. The ability to read true

RMS provides much more measurement versatility. The Greenlee DM-860 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.

DC + AC True RMS

DC + AC true RMS calculates both of the AC and DC components given by the expression

when making measurements and responds accurately to the total effective RMS value

regardless of the waveform. Distorted waveforms with the presence of DC components and

harmonics may cause:

•Transformers, generators, and motors to overheat

•Circuit breakers to trip prematurely

•Fuses to blow

•Neutrals to overheat due to the triplen harmonics present on the neutral

•Bus bars and electrical panels to vibrate

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