DCM340 - Multimeter Megger - Free user manual and instructions

Product Type	Digital Clamp Multimeter
Brand	Megger
Model	DCM340
Dimensions	230 x 70 x 38 mm
Weight	300 g (with batteries)
Power Supply	2 x AA batteries (1.5V)
Display	LCD, 4000 counts
AC Current Range	0.1 A to 400 A
DC Current Range	0.1 A to 400 A
AC/DC Voltage Range	0.1 V to 600 V
Resistance Range	0.1 Ω to 40 MΩ
Capacitance Range	1 nF to 100 µF
Frequency Range	10 Hz to 10 kHz
Temperature Measurement	-20 °C to 1000 °C (with type-K thermocouple)
Continuity Test	Yes, audible below 30 Ω
Diode Test	Yes
Data Hold	Yes
Auto Range	Yes
Safety Rating	CAT III 600 V
Operating Temperature	0 °C to 40 °C
Storage Temperature	-10 °C to 50 °C
Relative Humidity	Up to 80% (non-condensing)
Accessories Included	Test leads, type-K thermocouple, batteries, pouch
Maintenance	Clean with a dry cloth; do not use solvents
Spare Parts / Repairability	Batteries and test leads are user-replaceable; other repairs by qualified personnel

Frequently Asked Questions - DCM340 Megger

How do I measure AC current with the Megger DCM340?

Set the rotary switch to the AC current range (A~). Open the clamp jaws and place them around the conductor. Ensure the conductor is centered. Read the value on the LCD. For accurate readings, avoid measuring near strong magnetic fields.

What is the maximum voltage I can measure with this multimeter?

The DCM340 can measure up to 600 V AC/DC. The safety rating is CAT III 600 V, so it is suitable for distribution-level measurements but not for high-voltage primary lines.

How do I replace the batteries?

Turn off the meter and remove the test leads. Unscrew the battery compartment cover on the back. Replace the two AA batteries with fresh ones, observing polarity. Reattach the cover and screws.

Can the DCM340 measure temperature?

Yes, it can measure temperature using an optional type-K thermocouple (included). Set the rotary switch to the °C/°F position, insert the thermocouple into the input jacks, and touch the probe to the object.

What does the 'Data Hold' button do?

The Data Hold button freezes the current reading on the display. Press it once to hold the value, press again to release. This is useful for recording measurements in hard-to-reach areas.

How do I perform a continuity test?

Set the rotary switch to the continuity/diode position (usually marked with a sound wave symbol). Connect the test leads to the circuit or component. A continuous beep indicates a short circuit (resistance below 30 Ω).

What is the accuracy of the DCM340 for AC current?

The accuracy varies by range, typically ±(1.5% + 5 digits) for AC current from 0.1 A to 400 A. For best accuracy, refer to the manual.

Can I measure DC current with the clamp?

Yes, the DCM340 can measure DC current using the clamp. Set the rotary switch to the DC current range (A---). Open the clamp and center the conductor. The reading will be displayed.

What does the 'MAX/MIN' function do?

The MAX/MIN function records the maximum and minimum values during a measurement session. Press the button to cycle through MAX, MIN, and current reading. Hold for 2 seconds to exit.

How do I clean and maintain the multimeter?

Wipe the exterior with a dry, lint-free cloth. Do not use solvents or abrasives. Keep the clamp jaws clean and free of dirt. Store in a dry place. If not used for long periods, remove the batteries.

USER MANUAL DCM340 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.

■ To enhance safety, test leads should be disconnected from instrument when not in use.

■ Do not use test leads or the Clamp Meter if they look damaged.

■ Do not use the Meter if the Clamp Meter 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 might be impaired.

■ Special precautions are necessary when operating in situations where exposed live parts at dangerous voltages may be encountered. Personal protective equipment (not supplied with this instrument) should be used.

The test leads should be disconnected from the instrument when making a current measurement.

■ Use caution with voltages above 30 V ac rms, or 60 V dc. These voltages pose a shock hazard.

■ To avoid false readings that could lead to electric shock and injury, replace the battery as soon as the low battery indicator (☐) appears.

CAUTION :

CAUTION : If the meter is used in the vicinity of equipment which generates electromagnetic interference, the display may become unstable or the measurements show may be subject to large errors.

1.1 Maintenance

Do not attempt to repair this Clamp Meter.

It contains no user-serviceable parts. Repair or serving should only be performed by qualified personal.

1.2 Cleaning

Periodically wipe the case with a dry cloth and detergent do not use abrasives or solvents.

1.3 Safety, Hazard and Warning symbols on the instrument

This paragraph details the various safety and hazard icons on the instrument's outer case.

Icon Description
	Warning: High Voltage, risk of electric shock
	Caution: Refer to user guide.
	UK conformity. This equipment complies with current UK legislation
	EU conformity. Equipment complies with current EU directives.
	Equipment complies with current 'C tick' requirements.
	Do not dispose of in the normal waste stream.
[HX26]	Equipment protected throughout by double insulation.
	AC measurement
	DC measurement
[WWX]	Reference earth connection. Not a protective earth terminal
	Battery

CAT IV - Measurement category IV: Equipment connected between the origin of the low-voltage mains supply and distribution panel.

CAT III -Measurement category III: Equipment connected between the distribution panel and electrical outlets.

CAT II - Measurement category II: Equipment connected between the electrical outlets and user's equipment.

CAT I - Measurement category I: The circuits are not connected to mains.

Measurement equipment may be safely connected to circuits at the marked rating or lower. The connection rating is that of the lowest rated component in the measurement circuit.

2. Operation

2.1 Power On / Off

2.2 Auto Power Off

Auto Power Off disable : Press buttons (except Hold button) than switch the rotary knob to power on the Meter.

2.3 AC V / DC V

2.4 Resistance

2.5 Continuity

CAT.III.600 V with respect to earth for the jaw.

Do not hold the meter in front of the Tactile Barrier.

2.7 Hz

2.8 Zero

2: REL: Meter save the displayed offset value after one press of the ZERO button. The LCD is displaying the relative value.

3: REL (flashing): A second press of the ZERO button saves the offset value, with the present value then displayed.

1: Normal : Press and hold ZERO for ≥ 2 sec to return to normal operation and cancel the offset value.

2.9 Data Hold

2.10 Min / Max Hold

2: MAX: Meter is saving the maximum and minimum value. Maximum value is displayed

3: MIN: Meter is saving the maxi mum and minimum value. Minimum value is displayed

4: MAX MIN (flashing): Meter is saving the maximum and minimum values. Present value is displayed.

1: Normal : Press and hold MIN MAX to return to normal operation.

2.11 Battery Replacement

Low battery: " is displayed or flashes when a button pressed.

To avoid false readings that could lead to electric shock and injury, replace the battery as soon as the low battery indicator (appears.

2.12 Peak Hold

2: PMAX: Meter is saving the peak maximum and minimum value. Peak maximum value is displayed.

3: PMIN: Meter is saving the peak maximum and minimum value. Peak minimum value is displayed

4: CAL : Press and hold PEAK button ≥3 sec to calibrate the Meter itself for accurate measurement.

1: Normal : Press and hold PEAK button to return to normal operation.

2.13 Back Light

Back light Automatic off after 60 seconds.

3. Specifications

Specification Detail
1-1 General Specifications
LCD display digits : 3 3/4 digit large scale LCD readout.
Display count : 4000 counts.
Measuring rate : 1.5 times / sec.
Overrange display : "OL" is displayed for "Ω" functions, shows the real value for "A" and "V" function.
Automatic power off time : Approximately 30 minutes after
Low battery indicator :	is displayed. Replace the battery when the indicator [Yax2]appears in the display.To avoid false readings that could lead to electric shock and injury, replace the battery as soon as the low battery indicator appears.
Power requirement : 9 V PP3 / 6LR61 battery.	Rechargeable batteries are not suitable for use with this instrument.
1-2 Environmental Conditions
Indoor Use.
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).
Overvoltage category : IEC 61010-1 600 V CAT.III. CAT.III equipment is designed to protect against the transients in the equipment in fixed installations, such as distribution panels, feeders and short branch circuits and lighting systems in large buildings.
Operating altitude : 2000 m (6562 ft)
Conductor Size :	35 mm diameter.
Pollution degree :	2
EMC :	EN 61326-1
Shock vibration :	Sinusoidal vibration per MIL-T- 28800E(5 ~ 55 Hz, 3 g maximum).
Drop Protection :	1.2 m drop to hardwood on concrete floor.

1-2 Environmental Conditions

Indoor Use.
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).
Overvoltage category : IEC 61010-1 600 V	CAT.III. CAT.III equipment is designed to protect against the transients in the equipment in fixed installations, such as distribution panels, feeders and short branch circuits and lighting systems in large buildings.
Operating altitude : 2000 m (6562 ft)
Conductor Size :	35 mm diameter.
Pollution degree :	2
EMC :	EN 61326-1
Shock vibration :	Sinusoidal vibration per MIL-T- 28800E(5 ~ 55 Hz, 3 g maximum).
Drop Protection :	1.2 m drop to hardwood on concrete floor.

1-3 Electrical Specifications

Accuracy is ±(% reading + number of digits) at 23 °C ±5 °C < 80%RH.

Temperature coefficient: Add 0.2 x (Specified accuracy) / °C, < 18 °C, > 28 °C.

Voltage

Function	Range Accuracy
V~	0~400.0 Vrms400~600 Vrms	±(1.0%+5 dgt) 50Hz ~ 500 Hz
V=	0~400.0 V400~600 V	±(0.7% + 2 dgt)

Over voltage protection : 600 V rms

Input Impedance : 1 MΩ // less than 100 pF.

AC Conversion Type : AC Conversion are average sensing rms indication calibrated to the rms value of a sine wave input.

Resistance and Continuity :

Function Range		Accuracy
Ω	400.0 Ω	±(1% + 3 dgt)

Over voltage protection : 600 V rms

Max. open circuit voltage : 3 V

Continuity check : Internal sounds activates if the resistance of the circuit under test is less than 30Ω approximately.

AC Current

Function	Range	Accuracy
A~(50~60 Hz)	0~400.0 A ±(1	.5%+ 5 dgt) *1
	400~600 A	±(2.0%+ 7 dgt)
A~(61~400 Hz)	0~400.0 A ±(2.0%+ 5 dgt) *1
	400~600 A	±(2.5%+ 7 dgt)

*1 : Over 80% of full scale add ±1.6%

Overload protection :

600 A rms

AC Conversion Type and additional accuracy is same as AC Voltage.

Position Error : ±1% of reading.

DC Current

Function	Range	Accuracy
A-	0~400.0 A ±(1	.2%+ 5 dgt)
	400~600 A ±(1.9%+ 7 dgt)

Overload protection : 600 A rms

Position Error :

±1% of reading.

Specifications

Addition error according to remanence :	1% max. of current crest.
Auto Power Off (APO) The meter will automatically shut itself off after approximately 30 minutes after power on.
Frequency : Hz	Function	Range	Accuracy
	20~400 Hz	1 Hz	±(0.1% + 2 dgt)
Overload protection : 600 A rms.
Sensitivity :	3 A rms for ACA (A~) (>400 Hz Unspecified)
Peak Hold : ±(3% + 15dgt) *>600 Vpeak	Unspecified. *>600 A peak Unspecified.
Min/Max Hold : add ± 15 dgt to accuracy	for ACA / DCA.* Automatically switch to the low resolution range at Peak Hold and MIN MAX Hold.

4. Limited Warranty

This Meter is warranted to the original purchaser against defects in material and workmanship for 1 year from the date of purchase. 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, disposable batteries, or damage from abuse, neglect, accident, unauthorized 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.

4.1 Decommissioning

4.2 WEEE Directive

The crossed out wheeled bin symbol placed on Megger products is a reminder not to dispose of the product at the end of its life with general waste.

Megger is registered in the UK as a Producer of Electrical and Electronic Equipment. The Registration No is WEE/HE0146QT.

For further information about disposal of the product consult your local Megger company or distributor or visit your local Megger website.

4.3 Battery disposal

The crossed out wheeled bin symbol placed on a battery is a reminder not to dispose of batteries with general waste when they reach the end of their usable life.

For disposal of batteries in other parts of the EU contact your local Megger branch or distributor.

Megger is registered in the UK as a producer of batteries (registration No.: BPRN00142).

For further information see www.megger.com

Manufacturing sites

Megger Limited	Megger GmbH	Megger USA - Valley Forge
Archcliffe Road	Weststraße 59	Valley Forge Corporate Center
Dover	52074 Aachen	2621 Van Buren Avenue
Kent	T. [phone]	Norristown
CT17 9EN	E. [e-mail]	Pennsylvania, 19403
ENGLAND		USA
T. [phone]		T. [phone]
F. [phone]		F. [phone]

Megger USA - Dallas	Megger AB	Suite 100
4545 West Davis Street	Rinkebyvägen 19, Box 724, SE-182 17	Fort Collins CO 80525
Dallas TX 75237		USA
USA	DANDERYD	T. [phone]
T. 800 723 2861 (USA only)	T. [phone]
T. [phone]	E. [e-mail]

E. [e-mail]

Megger USA - Fort Collins4812 McMurry Avenue

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

Megger is a registered trademark

DCM340_UG_en_V02 08 2021

© Megger Limited 2020 www.megger.com