Greenlee DM-800 User manual
999 3259.8 © 2000 Greenlee Textron IM 1403 REV 2 6/00
DM-800 • DM-810
• DM-820
DIGITAL
MULTIMETERS
MULTÍMETROS
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-800, DM-810 and DM-820 Digital Multimeters are hand-held testing devices
with the following measurement capabilities: AC and DC voltage, AC and DC current,
temperature (K-type thermocouples only), frequency, resistance and capacitance. They also
check diodes and verify continuity.
Specialized functions and capabilities include:
• MAX/MIN function, which stores the maximum, minimum, and difference
(maximum – minimum)
• Bar graph display, which responds more quickly than the numeric display —␣ useful for
detecting faulty contacts, potentiometer clicks and signal spikes
• Crest capture mode to capture voltage or current signal peaks
• Zoom mode analog pointer, which magnifies the bar graph for higher resolution
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 the Greenlee DM-800, DM-810 and DM-820 Digital Multimeters.
Keep this manual available to all personnel.
Replacement manuals are available upon request at no charge.
and are registered trademarks of Greenlee Textron.
KEEP THIS MANUAL
DM-800 • DM-810 • DM-820
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.
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.
Electric shock hazard:
Contact with live circuits can result in severe injury or death.
4
Important Safety Information
Electric shock hazard:
• 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. The item(s) must be clean and dry,
and the insulation must be in good condition.
Failure to observe these warnings 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.
• 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 and fire hazard:
• Do not expose this unit to rain or moisture.
• 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.
DM-800 • DM-810 • DM-820
5
Important Safety Information
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.
• 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.
Unless measuring voltage, current or frequency, shut off and lock out power. Make
sure that all capacitors are discharged. Voltage must not be present.
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.
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 LCD and bar graph
2. Feature Buttons See explanations under Using the Features
3. Selector Selects a function or turns power OFF
4. APositive input terminal for high current measurements
5. mA µAPositive input terminal for low current measurements
6. COM Negative, common or ground input terminal for all measurements
7. ΩVPositive input terminal for all measurements
except
current
47
5
2
1
3
6
DM-800 • DM-810 • DM-820
7
Display Icons
8. Automatic Ranging is enabled.
9. Hold function is enabled.
10. Crest Capture function is enabled.
11. DC measurement is selected.
12. AC measurement is selected.
13. – Polarity Indicator
14. Diode
15. Low Battery
16. ∆Relative Zero function is enabled.
17. Bar graph is magnified for higher
resolution.
18. – Polarity for Bar Graph
19. OL Overload (numeric display)
Overload (bar graph display)
20. Bar Graph Element
21. MAX MIN MAX/MIN mode is enabled.
8
9–10
11–12
13
14
15–16
17
18
21
22
26–28
29–32
33
23–25
19 20
22. Continuity
23. n Nano (10-9)
24. µMicro (10-6)
25. F Farads
26. m Milli (10-3)
27. V Volts
28. A Amps
29. M Mega (106)
30. k Kilo (103)
31. ΩOhms
32. Hz Hertz (frequency in
cycles per second)
33. (variable) Sensitivity level for
Hz feature
8
Using the Features
• Automatic Power Off To extend battery life, the meter will shut itself off after approximately
17 minutes of inactivity. To restore power, press any button. To disable this feature, press
RANGE while turning the meter on.
• MAX/MIN (DM-820 only) Press momentarily to begin recording the input. MAX MIN will
appear on the display. The meter will beep whenever the minimum or maximum is updated.
When using the MAX/MIN function, press momentarily to cycle through the maximum,
minimum, difference (MAX – MIN). Press and hold to exit this mode.
The Automatic Power Off feature is disabled when using this function.
• CREST (DM-820 only) 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 5 ms. Press momentarily to cycle through the maximum
crest, minimum crest and maximum – minimum crest (peak to peak). Press and hold to exit
this mode.
The Automatic Power Off feature is disabled when using this function.
•∆(DM-820 only) 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.
•(DM-820 only) Press momentarily to change the resolution of the bar graph.
•Press and hold until LCD illuminates. The lamp turns off after 30 seconds to extend
battery life.
• SELECT Press momentarily to toggle between functions, or to toggle between AC and DC
when measuring current and millivolts.
• 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: When using MAX/MIN, HOLD, or
∆
mode, pressing
RANGE
will cause the meter to
exit that mode.
•HzPress to measure frequency.
Note: The sensitivity of the frequency measurement function varies with the measurement
range. To automatically select a sensitivity level, measure the voltage level first, then press
Hz
. 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.
DM-800 • DM-810 • DM-820
9
*The crest factor is the ratio of the peak value to the RMS value; it is represented by the
Greek letter ξ.
mrofevaW
eulaVSMR 001001001001
eulaVdeifitceR 090017846
*rotcaFtserC
(ξ)
414.1137.12
AC Measurement
AC measurements are usually displayed as RMS
(root mean squared)
values. Two methods of
AC measurement 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-800 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, sawtooth wave, half wave or signal with harmonics. The ability to read
true
RMS provides much more measurement versatility. The Greenlee DM-810 and DM-820 are
true RMS meters.
The Waveforms and Crest Factors table shows some typical AC signals and their RMS values.
Waveforms and Crest Factors
10
Operation
Electric shock hazard:
Contact with live circuits can result in severe injury or death.
1. See the Settings Table. Set the selector to the proper setting, press SELECT (when
instructed to do so), and connect the test leads to the meter.
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 fuses.
• If the unit still does not function as expected, send the unit to Greenlee for repair.
4. Take the reading from the circuit or component to be tested.
This manual suits for next models
2
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