Megger DCM305E User manual

User manual
DCM305E
Earth Leakage Clampmeter
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

2
GRead First
GSafety Information
To ensure safe operation and service of the meter, follow these
instructions.
Failure to observe warnings can result in severe injury or death.
■Avoid working alone so assistance can be rendered.
■Do not use the clamp meter if the instrument looks damaged
■Do not use the clamp meter if the tester is not operating properly or
if it is wet.
■Use the clamp meter only as specified in the instruction card or the
protection provided by the clamp meter may be impaired.
■Ensure hands are kept behind the barrier / hand guard when making
measurements.
■Special precautions are necessary when operating in situations where
exposed live parts at dangerous voltages may be encountered.
Personal protective equipment (not supplied with the instrument)
should be used.
■Use caution with voltages above 30 V AC RMS, or 60 V DC. These
voltages pose a shock hazard.

3
CAT IV
Measurement category IV: Equipment connected between the origin of the
low-voltage mains supply outside the building
and the consumer unit.
CAT III
Measurement category III: Equipment connected between the consumer
unit and the electrical outlets.
CAT II
Measurement category II: Equipment connected between the electrical
outlets and the user’s equipment.
Symbols as marked on the instrument and
instruction card
FRisk of electric shock
GSee instruction card
tEquipment protected by double or reinforced insulation
Low battery
gEarth
aAC measurement
cConforms to EU directives
Application around hazardous exposed live conductors is
permitted
Do not discard or throw away this product
GCaution
Take sufficient care not to apply shock, excessive vibration or force to the jaw
If the meter is used in the vicinity of equipment that generates large
electromagnetic fields, the display may become unstable or the measurements
may be subject to large errors.

4
Power Off / On
■The instrument displays battery capacity when powering up. Replace
batteries when 0% is displayed.
Auto Power Off Enable / Disable

Auto Hold Enable / Disable
In the AUTOHOLD mode, if the measured value remains within ±10 counts
over 10 measuring cycles the instrument will beep 3 times; the measured
value will be held on the display and “AUTOHOLD” will be displayed.
Subsequently if the measured value changes by ±10 counts, the instrument
will beep; “AUTOHOLD” will disappear and the instrument will revert to
displaying the new readings until the next AUTOHOLD conditions are met.
Note: When the AUTOHOLD activates, the displayed reading will be held for 3
seconds if the clamp jaws are removed from the conductor/s. During this time
the HOLD key may be pressed to hold the reading indefinitely.
Auto Backlight
The Auto backlight on the display activates automatically when the instrument
is used in very poor light locations
Test Equipment Depot - 800.517.8431
99 Washington Street, Melrose, MA 02176
TestEquipmentDepot.com

6
AC Current
Leakage Current Measurement
Recommended applications of instrument with respect to conductors.
Note: Measurements made on the earth conductor only will indicate current
in the earth conductor but not the entire installation.
GCAT III 300 V with respect
to earth for the jaw.
Barrier for hand guard.
GDo not hold the
instrument above the barrier.

7
Single / 1 phase
3 wire / 3 phase
Single / 1 phase
3 wire / 3 phase

4 wire / 3 phase + neutral
Data Hold
Note: Data Hold beep guard
The internal sounder will beep continuously with the LCD display flashing in
the Data Hold mode when the measured signal is 50 counts larger than the
LCD reading.
4 wire / 3 phase + neutral
Test Equipment Depot - 800.517.8431
99 Washington Street, Melrose, MA 02176
TestEquipmentDepot.com

9
Peak Hold
(forcing into the manual range mode)
Low Pass Filter
(forcing into the manual range mode)
■The cut-off frequency of the low pass filter is about 100 Hz with an
attenuation characteristic of approximately -24 dB / octave.

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Auto Range / Manual Range

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Comparator
Select a limit level
Confirm the limit level Comparing
■The instrument offers 3 limit values (0.25 mA, 0.5 mA and 3.5 mA)
■The internal sounder will beep continuously with the LCD display
flashing when measured value exceeds the confirmed limit level.

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Auto Hold

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Auto Power Off
Battery Replacement
Maintenance
Do not attempt to repair this meter. It contains no user-serviceable parts.
Repair or serving should only be performed by qualified personnel.
Cleaning
Periodically wipe the case with a dry cloth and detergent, do not use abrasives
or solvents.
WEEE Directive
The crossed out wheeled bin symbol on the instrument and on the batteries is
a reminder not to dispose of them with general waste at the end of their life.
Megger is registered in the UK as a Producer of Electrical and Electronic
equipment. The registration No is; WEE/DJ2235XR.
Users of Megger products in the UK may dispose of them at the end of their
useful life by contacting B2B Compliance at www.b2bcompliance.org.uk or
by telephone on 01691 676124.
Users of Megger products in other parts of the EU should contact their local
Megger company or distributor.

14
Battery Disposal
Batteries in this product are classified as Portable Batteries under the Batteries
Directive. Please contact Megger Ltd for instructions on the safe disposal of
these batteries.
For disposal of batteries in other parts of the EU contact your local distributor.
Megger is registered in the UK as a producer of batteries.
The registration number is BPRN01235.
Specifications
General Specifications
LCD display digits : 6000 count large scale LCD readout.
Measuring rate : 5 times / sec.
Over range display : Shows the real value for “100 A”
and shows “OL” for other ranges.
Automatic power off time : Approximately 20 minutes after power
on without operations.
Low battery indicator : is displayed. Replace the battery when
the indicator appears in the display.
Power requirement : 1.5 V x 2 batteries AAA / LR03
Battery type and life : Alkaline 60 hours.
Environmental Conditions
Indoor Use.
Pollution degree : 2
Calibration : One year calibration cycle.
Operating temperature : 0°C ~ 30 °C (≤ 80% RH)
30°C ~ 40 °C (≤ 75% RH)
40°C ~ 50 °C (≤ 45% RH)
Storage temperature : -20 to +60 °C, 0 to 80% RH
(batteries not fitted).
Operating altitude : 2000 m (6562 ft)
Conductor Size : 40 mm diameter.
Shock vibration : No shock, No vibration to the jaw tips.
Temperature coefficient : 0.2 x (Specified accuracy) / °C,
< 18 °C, > 28 °C
EMC : EN 61326-1
Overvoltage category : IEC 61010-1 300 V CAT III
Accuracy is ±(% reading + number of digits) at 23 °C ± 5 °C < 80% RH.

AC Current
Range Resolution Accuracy
* 6 mA 0.001 mA 0A ~ 10A
±(1% reading + 8 digits)
10 ~ 50A
±(2% reading + 10 digits)
50 ~ 100A
±(10% reading + 10 digits)
60 mA 0.01 mA
600 mA 0.1 mA
6 A 0.001 A
60 A 0.01 mA
100 A 0.1 A
* Digit rolling ±3 digits.
Frequency Response (61~400 Hz) :
0A ~ 10A
±(2% reading + 11 digits)
10 ~ 50A
±(10% reading + 11 digits)
50 ~ 100A
±(35% reading + 11 digits)
Position Error: ±1% of reading.
Additional Accuracy by Crest Factor (C.F.):
Add 1.0% for C.F. 1.4 ~ 2.0.
Add 2.5% for C.F. 2.0 ~ 2.5.
Add 4.0% for C.F. 2.5 ~ 3.0.
Max. Crest Factor: 1.6 for 6000 ~ 5000 digits
2.0 for 5000 ~ 3000 digits
3.0 for 3000 ~ 0 digits
Influence of external magnetic field of adjacent wires :
0.04% typical value.
Low Pass Filter
Range Resolution Accuracy
* 6 mA 0.001 mA 0A ~ 10A
±(2% reading + 8 digits)
10 ~ 50A
±(3% reading + 10 digits)
50 ~ 100A
±(12% reading + 10 digits)
60 mA 0.01 mA
600 mA 0.1 mA
6 A 0.001 A
60 A 0.01 A
100 A 0.1 mA
* Digit rolling ±3 digits.
Attenuation characteristic: approximately –24 dB/octave
Cut-off frequency : 100 Hz
Test Equipment Depot - 800.517.8431
99 Washington Street, Melrose, MA 02176
TestEquipmentDepot.com