Megger DCM305E User manual

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DCM305E

Earth Leakage Clampmeter

2megger.com

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.

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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.

4megger.com

Power Off / On

■The instrument displays battery capacity when powering up. Replace

batteries when 0% is displayed.

Auto Power Off Enable / Disable

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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

6megger.com

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.

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Single / 1 phase

3 wire / 3 phase

Single / 1 phase

3 wire / 3 phase

8megger.com

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

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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.

10 megger.com

Auto Range / Manual Range