DCM305E - Measuring equipment Megger - Free user manual and instructions

Product Type	Earth Leakage Clamp Multimeter
Brand	Megger
Model	DCM305E
Power Supply	2 x 1.5 V AAA/LR03 batteries
Battery Life	60 hours (alkaline batteries)
Display	Large scale LCD screen, 6000 counts
AC Current Measurement Ranges	6 mA, 60 mA, 600 mA, 6 A, 60 A, 100 A
Maximum Resolution	0.001 mA
Overvoltage Category	IEC 61010-1 300 V CAT III
Operating Temperature	0 °C to 50 °C @RH
Storage Temperature	-20 °C to +60 °C
Operating Altitude	2000 m
Maximum Conductor Diameter	40 mm
Main Functions	AC current measurement, leakage current, data hold, peak hold, low-pass filter (100 Hz), comparator, auto power off
Safety	Double insulation, hand guard, warnings for voltages >30 VAC
Maintenance and Cleaning	Clean with dry cloth and detergent, no abrasive products
Repairability	No user-serviceable parts, repair by qualified technicians
Warranty	1 year (3 years if registered at www.megger.com)
Weight	Approx. 200 g (with batteries)
Dimensions	Approx. 200 x 60 x 30 mm

Frequently Asked Questions - DCM305E Megger

How to turn on and off the Megger DCM305E?

Press the POWER button to turn on the device. To turn it off, press and hold the POWER button for about 2 seconds or wait for the automatic power-off after 20 minutes of inactivity.

How to use the Auto-Hold function (AUTOHOLD)?

Activate AUTOHOLD mode via the menu. When the measurement remains stable (variation < ±10 counts over 10 cycles), the device emits three beeps and freezes the value. If the measurement changes by more than ±10 counts, the hold is released.

What is the function of the low-pass filter?

The low-pass filter (cutoff frequency 100 Hz, attenuation -24 dB/octave) allows measuring leakage current in high-frequency environments by filtering harmonic components for a more accurate reading.

How to replace the batteries?

When the low battery icon appears, remove the battery compartment cover on the back of the device. Replace the two AAA/LR03 batteries respecting polarity. Close the cover.

What does the symbol 'OL' on the display mean?

OL (OverLoad) indicates that the measurement exceeds the selected range. For ranges below 100 A, 'OL' is displayed; on the 100 A range, the actual value is shown even beyond.

How to measure leakage current with the DCM305E?

Place the clamp around the conductor to be tested (phase, neutral or ground). Select AC current mode. For leakage current, it is recommended to measure on the ground conductor or perform a differential measurement by clamping the phase+neutral together.

What safety precautions should be taken?

Never work alone. Use the device only with hands behind the hand guard. For voltages >30 VAC, wear personal protective equipment. Do not use the clamp if damaged or wet.

How to interpret the crest factor?

The crest factor affects accuracy. For a crest factor of 1.4 to 2.0, add 1.0% error; from 2.0 to 2.5 add 2.5%; from 2.5 to 3.0 add 4.0%. The maximum crest factor varies depending on the number of displayed counts.

What to do in case of abnormal measurement fluctuation?

A fluctuation of ±3 digits is normal. If the display is unstable, check that the clamp is not exposed to a strong electromagnetic field. Move the device away from interference sources or use the low-pass filter.

How to clean and maintain the device?

Clean the housing regularly with a dry cloth and mild detergent. Do not use abrasive products or solvents. Avoid shocks to the jaws. No internal parts are user-serviceable.

USER MANUAL DCM305E Megger

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.

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

Risk of electric shock

See instruction card

Equipment protected by double or reinforced insulation

Low battery

Earth

AC measurement

Conforms to EU directives

Application around hazardous exposed live conductors is permitted

Do not discard or throw away this product

Caution

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.

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

AC Current

CAT III 300 V with respect to earth for the jaw.

Barrier for hand guard.

Do not hold the instrument above the barrier.

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.

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.

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.

Auto Range / Manual Range

Comparator

■ 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.

Auto Hold

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.

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.

For Further information see www.megger.com

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):

$$ \begin{array}{l} 0 \mathrm{A} \sim 1 0 \mathrm{A} \ \pm (2 \% \text { reading } + 1 1 \text { digits }) \ 1 0 \sim 5 0 A \ \pm (10 \% \text { reading } + 11 \text { digits }) \ 5 0 \sim 1 0 0 A \ \pm (35 \% \text { reading } + 11 \text { digits }) \ \end{array} $$

Position Error: ±1% of reading.

Additional Accuracy by Crest Factor (C.F.):

$$ \begin{array}{l} \text { Add } 1.0 \% \text { for C.F. } 1.4 \sim 2.0. \ \text { Add } 2.5 \% \text { for C.F. } 2.0 \sim 2.5. \ \text { Add } 4.0 \% \text { for C.F. } 2.5 \sim 3.0. \ \end{array} $$

Max. Crest Factor: 1.6 for 6000 \~ 5000 digits

$$ 2. 0 \text { for } 5 0 0 0 \sim 3 0 0 0 \text { digits } $$

$$ 3. 0 \text { for } 3 0 0 0 \sim 0 \text { digits } $$

Influence of external magnetic field of adjacent wires :

$$ 0. 04 \% \text { typical value }. $$

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

Limited Warranty

This meter is warranted to the original purchaser against defects in material and workmanship for 1 year from the date of purchase. If the product is registered on the Megger website www.megger.com the warranty is extended to 3 years.

During this warranty period, manufacturer will, at its option, replace or repair the defective unit, subject to verification of the defect or malfunction.

This warranty does not cover fuses, disposable batteries, or damage from abuse, neglect, accident, unauthorised repair, alteration, contamination, or abnormal conditions of operation or handling.

Any implied warranties arising out of the sale of this product, including but not limited to implied warranties of merchantability and fitness for a particular purpose, are limited to the above. The manufacturer shall not be liable for loss of use of the instrument or other incidental or consequential damages, expenses, or economic loss, or for any claim or claims for such damage, expense or economic loss. Some states or countries laws vary, so the above limitations or exclusions may not apply to you.

Megger Limited

Archcliffe Road

Dover

Kent

CT17 9EN

Tel: [phone] Fax: [phone] www.megger.com

Megger

DCM305E

Leckstromzange für

Ableitstrom

Benutzerhandbuch

Zuerst lesen

4 wire/3 phase+neutral

Daten-Halten

Positionsfehler: ±1% of reading.

■ 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.

Auto-maintien

Erreur de position: ±1% of reading.

⚠️ Leer primero

44wibles3 phase-penneutral

Retención de datos

⚠️ Lees dit eerst

Batterijvervanging

Onderhoud

Positie Fout: ±1% of reading.

Valley Forge Corporate Center

2621 Van Buren Avenue

Norristown

Pennsylvania,

19403 USA

T. 1-610 676 8500

F. 1-610-676-8610

Megger USA - Dallas

4271 Bronze Way

Dallas TX 75237-1019 USA

T 800 723 2861 (USA only)

T [phone]

F [phone]

[e-mail]

Megger AB

This instrument is manufactured in Taiwan.

The company reserves the right to change the specification or design without prior notice.

Megger is a registered trademark

DCM305E_UG_en-de-fr-es-nl_V05 05 2021

www.megger.com