Megger DCM340 User manual

DCM340

Clampmeter

User Guide

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DCM340

Safety Information

1. Safety 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.

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 sould 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.

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Safety Information

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

FWarning: High Voltage, risk of electric shock

GCaution: Refer to user guide.

UK conformity. This equipment complies with current UK legislation

cEU conformity. Equipment complies with current EU directives.

Equipment complies with current ‘C tick’ requirements.

Do not dispose of in the normal waste stream.

tEquipment protected throughout by double insulation.

aAC measurement

dDC measurement

gReference 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.

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DCM340

Operation

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

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Operation

2.6 ACA / DCA

GCAT.III.600 V with respect to earth for the

jaw.

GDo 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.

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DCM340

Operation

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.

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Operation

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.

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DCM340

Speciﬁcations

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

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.

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Speciﬁcations

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

Va0~400.0 Vrms

400~600 Vrms

±(1.0%+ 5 dgt) 50

Hz ~ 500 Hz

Vd0~400.0 V

400~600 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

Ω400.0 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

(50~60 Hz)

0~400.0 A ±(1.5%+ 5 dgt) *1

400~600 A ±(2.0%+ 7 dgt)

(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

Ad0~400.0 A ±(1.2%+ 5 dgt)

400~600 A ±(1.9%+ 7 dgt)

Overload protection : 600 A rms

Position Error : ±1% of reading.

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DCM340

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 (Aa) (>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.

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