Greenlee DML-430 User manual

999 3262.8 © 2000 Greenlee Textron IM 1406 REV 1 6/00
DML-54 • DML-430
DIGITAL
MULTIMETERS
MULTÍMETROS
DIGITALES
MULTIMETRES
NUMERIQUES
SELECT
Start
RANGE HOLDHz
COMmA µAA V
Temp
µA
mV
V
V
mA
A
OFF
OFF
Temp
MAXMAX
10A
HBC FUSED
MAX 0.5A
HBC FUSED 600V
1000V CAT III CAT II
-
+
MkΩHz
H C
AUTO
012345
5000mV
mVA
F%
n
µ
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 DML-54 and DML-430 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,
verify continuity, and store data.
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 DML-54 and DML-430 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

DML-54 • DML-430
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.
Electric shock hazard:
Contact with live circuits can result in severe injury or death.
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.

4
Important Safety Information
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.
• 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:
• 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.
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.

DML-54 • DML-430
5
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.
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 instrument.
• Do not attempt to repair this unit. It contains no user-serviceable parts.
• Do not expose unit to extremes in temperature or high humidity. See Specifications.
Failure to observe these precautions can result in injury and can damage the instrument.
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 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. Temp
ΩV Positive input terminal for all measurements except current
SELECT
Start
RANGE HOLDHz
COMmA µAA V
Temp
µA
mV
V
V
mA
A
OFF
OFF
Temp
MAXMAX
10A
HBC FUSED
MAX 0.5A
HBC FUSED 600V
1000V CAT III CAT II
2
3
1
4567

DML-54 • DML-430
7
Display Icons
8. Automatic Ranging is enabled
9. Hold Function is enabled
10. Call Function (data retrieval) 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. - Polarity for Bar Graph
18. OL Overload (Numeric Display)
Overload (Bar Graph Display)
19. Bar Graph Element
20. Continuity
21. n Nano (10-9)
22. µMicro (10-6)
23. F Farads
24. m Milli (10-3)
25. V Volts
26. A Amps
27. M Mega (106)
28. k Kilo (103)
29. ΩOhms
30. Hz Hertz (Frequency or Cycles per Second)
31. (variable) Sensitivity level for Hz feature
Symbols on the Unit
Read the instruction manual.
Double Insulation
-
+
MkΩHz
H C
AUTO
012345
5000mV
mVA
F%
n
µ
8
9,10
11,12
13
15
14
16
17
18
27,28,29,30
31
24,25,26
21,22,23
20
19

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 SELECT. To disable this
feature, press RANGE while turning the meter on.
START || ▼ ▲ Used for storing, reviewing and retrieving data. See the explanation
under Data Storage Function.
The Automatic Power Off feature is disabled when using this function.
Press and hold to illuminate the LCD. 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.
Hz Press 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.

DML-54 • DML-430
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 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 DML-54 and DML-430
are true RMS meters.
The Waveforms and Crest Factors table shows some typical AC signals and their RMS values.
Waveforms and Crest Factors

10
Data Storage Function
The DML-430 and DML-54 have data storage and retrieval capability. The DML-430 can store
up to 43000 measurements; the DML-54 can store up to 5400 measurements. The user can
later review the data on the multimeter’s display, or download the data to a computer.
When in the recording mode, the meter takes a measurement, assigns that measurement to
the next available memory location, and repeats the process. This continues until the memory
is full or until the user manually stops the recording process.
The time interval between measurements (sampling rate) is selected by the user. A shorter
time interval will provide information about short-term fluctuations, whereas a longer time
interval will provide information about general trends. The factory setting is the shortest time
interval.
The time intervals are as follows: 0.05 seconds (0.2s for temperature and 0.4s for frequency),
1s, 20s, 40s, 60s, 120s (two minutes), 240s (four minutes), and 480s (eight minutes). The
minimum total measurement time for the DML-54 is 4 minutes and 30 seconds; the maximum
is 30 days. The minimum total measurement time for the DML-430 is 35 minutes and 30
seconds. The maximum is nearly 8 months.
When the sampling rate is 20s or greater, the meter will go to standby mode between
measurements to extend battery life. When the meter is in the standby mode, press SELECT
momentarily to view the display.