Megger DLRO100 Operating Manual

DLRO100E, 100EB, 100X, 100XB, 100H & 100HB

Digital Low Resistance Ohmmeter

User guide

100A High Performance

Contents

Safety warnings 3

Safety and hazard symbols used on the instrument 4

General description 5

Instrument controls and indicators 6

Preparations for use 7

Operating instructions 8

Lead connections 9

1 - Testing modes 10

2 - Instrument set-up 12

2 - DLRO100A Resetting Battery Charge 16

3 - Saving a test record 17

4 - Delete results 18

5 - Download a test record 19

6 - Remote operation 20

7 - Asset tagging 21

8 - Screen symbol reference 22

Battery indicator 23

Error Indicator 24

Preventive maintenance 25

Technical speciﬁcation 26

Accessories 27

Acknowledgements 27

Repair and warranty 28

Calibration, service and spare parts 28

Approved service centres 28

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G Safety warnings

These must be read and understood before use. Retain these safety warnings for future reference.

■ CAUTION: THE INSTRUMENT MUST BE OPERATED ONLY BY SUITABLY TRAINED AND COMPETENT PERSONS

■ Users of this equipment and their employers are required by National Health and Safety Legislation to carry out valid risk assessments of all electrical work so as to identify potential sources of electrical danger and risk of electrical injury.

■ The instrument must NOT be used if any part of it is damaged.

■ Damaged test leads must NOT be used. Test leads, connectors and mechanical guards must be in good order, clean and with no broken or cracked insulation.

■ Fan ﬁlters and covers giving access to internal conductive parts must be correctly ﬁtted before use.

■ Testing inductive circuits can be hazardous: The DLRO100 is a high power instrument, designed for testing resistive loads. It must NOT be used to test inductive loads.

■ DANGER! The instrument is not fully protected when switched off.

• Switch the instrument ON before connecting to the test subject.

• The test subject must be switched off, de-energised and checked before test connections are made. Ensure that the

test subject cannot be re-energised whilst the instrument is connected.

• Do not leave the equipment unattended when connected to the test subject.

• Do not leave the equipment connected to the test subject after the test is completed.

■ The user must exercise caution when connecting to and disconnecting from the test subject.

• Always connect test leads to the instrument before attaching to test subject.

• Keep hands behind tactile barriers on probe clips and clamps when making or breaking connections.

• High current connections between the instrument and test subject must be secured against accidental detachment

and must not be disengaged whilst test current is ﬂowing.

• High current test leads must be a minimum of 3 milliohm resistance.

• Circuit terminals must not be touched during test.

• Do not disconnect the instrument from the test subject until the test current has stopped and the TEST warning

indicator is extinguished.

• Test leads and connections may become hot during use. Exercise caution when handling.

• Disconnect from the test subject before switching the instrument OFF.

■ DANGER! Some models can be operated by remote control. A test can be started at any time by remote control. These additional precautions must be taken for instruments with a remote control function.

• Measurement connections must be handled only when precautions have been taken to prevent a remote control

test start.

• If the remote control link should fail, the test must be stopped manually by pressing the TEST button.

■ If this equipment is used in a manner not speciﬁed by the manufacturer, the protection provided by the equipment may be impaired.

■ Fan ﬁlters are user-serviceable. Disconnect all measurement leads and switch the instrument OFF before servicing the fan ﬁlters.

■ There are no user-serviceable parts inside the instrument; all servicing, including fuse replacement, must be referred to Megger approved service centres.

■ Use only Megger approved battery pack, and follow the instructions provided with the battery

■ Warning! This instrument contains a Lithium Ion High Energy Battery Pack and a lithium coin cell.

• Do not pierce, damage, disassemble or modify the battery. The battery contains safety and protection devices

which, if tampered with may cause the battery to generate heat, rupture or ignite.

• Never heat (or dispose of) the battery in a ﬁre.

• Do not subject the battery to strong impact, mechanical shock or excessive heat.

• Do not expose the battery to water, salt water or other liquids, or allow the battery to get wet.

• Never short-circuit or reverse the polarity of the battery pack.

• In the event of a battery cell leaking, do not allow the released ﬂuid to come into contact with the skin or eyes. If

contact has been made, wash the affected area with plenty of water and seek medical advice immediately.

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Safety and hazard symbols used on the instrument

G Caution: refer to user instructions

F Caution: risk of electric shock

IP54 Enclosure is dust proof and protected against

water splashes

Equipment protected throughout by

Double Insulation.

Line Power / mains

600V ac rms maximum between terminals,

and between terminals and earth

Measurement Connection

■ Only Megger supplied test leads designed for this instrument provide the full safety rating.

Equipment complies with current EU directives.

N13117 Equipment complies with current

“C tick” requirements.

Do not dispose of in the normal

waste stream.

g Connect to earth for Voltage

measurement reference

Universal Serial Bus (USB)

Bluetooth

Voltage

The rated measurement connection voltage is the maximum line to earth voltage at which it is safe to connect.

CAT IV

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

CAT III

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

CAT II

Measurement category II: Equipment connected between the electrical outlets and the user’s equipment.

■ 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.

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.

www.megger.comDLRO100E, 100X & 100H – 100A

General description

The new Megger DLRO100 range of Low Resistance Ohmmeters provide high accuracy with noise immunity, are robust yet light and portable.

The range consists of three models:

■ DLRO100E/EB has advanced features of conﬁgurable tests, manual, auto and continuous tests,

■ DLRO100X/XB in addition has internal memory storage for test records and USB connectivity,

■ DLRO100H/HB in addition to the above has Bluetooth

Key features

■ CAT IV 600 VAC / 500 VDC up to 2000 m on all test terminals for safe operation

■ CAT IV 300 V up to 4000 m

■ Lightweight 100 A battery powered unit for portability – 7.9 Kg (17 lbs)

■ Li-ion battery for high power and fast charge - works from an AC supply if the battery is fully discharged

■ High noise immunity for stable readings

■ Smooth DC Output for circuit breaker testing

■ IP54 (lid open) for protection against ingress during operation (IP65 lid closed)

■ Adjustable 10 - 100 A output, 4 terminal measurement for ﬂexibility

■ Adjustable current ramp rates and test duration for ﬂexibility

■ Battery capacity - 200 single tests or up to 2x 10 minutes continuous 100 A output for extended use

■ Mains only units for manufacturing and production applications where AC is always available

■ Ultra tough outer case construction designed for use in demanding environments with a ﬂame retardant UL94 V0 inner case for safety

■ DualGround™ - Using the optional DC clamp enables circuit breaker testing with ground protection in place (100X & 100H variants) for safety

■ Large, clear LCD for all light conditions

■ Time and Date stamped memory for recording of results (220 readings)

■ Range and test mode rotary switches for simplicity of operation

■ Memory Storage and USB download capability (100X & 100H variants) for effective results management

■ Remote Operation - Control the instrument remotely via a PC or laptop (100H variants) for added safety

■ Smart device support - Running a Power DB app on Windows 8 tablet or smart phone to populate unique asset ID’s (100H variants) for efﬁcient asset management

■ Two year warranty - second year conditional on free product registration

, remote operation and smart device capability.

This product and its accessories are covered by EU design registrations 002349134-0001 and 002349134-0002. This product and its accessories are the subject of patents pending.

www.megger.comDLRO100E, 100X & 100H – 100A

Instrument controls and indicators

1. Current terminals – C1 - C2

DLRO100

MAX

600 V

C1 - - C2

P1 - - P2

AUTO

MAN

TEST

10A

Ω

50A

100A

MAX

600 V

MAX

600 V

MAX

600 V

CAT IV

600 V

2. C1 - C2 LED indicates continuity on the C terminals

3. P1 - P2 LED indicates continuity on the P terminals

4. Potential terminal

- P1 - P2

5. Measurement earth terminal

6. DualGround™ terminal 100X and 100H only

7. Save button 100X and 100H only

910

8. Range rotary switch

9. TEST button with associated warning lamp

10. Navigation / OK buttons

11. Test mode rotary switch

90-264 V 47-63 Hz 500 VA

DLRO100EB

Made in UK by Megger

N13117

12. Backlight button

13. Display

14. LED indicating line power / mains

15. Power socket

16. USB Device port 100X and 100H only

17. Cooling fans with IP54 cover

www.megger.comDLRO100E, 100X & 100H – 100A

Preparations for Use

C1 - - C2

P1 - - P2

10A

Ω

100A

MAX

600 V

MAX

600 V

MAX

600 V

MAX

50A

600 V

CAT IV 600 V

DLRO100

AUTO

MAN

TEST

Initial instructions

■ Remove instrument, power lead and pouch from the packing box.

■ Open the lid noting position of the IEC 60320 power inlet and USB device port on the left panel. Test terminals are located to the right of the front panel.

■ Read the safety warnings.

■ A quick reference is provided in the instrument lid.

■ Keep the original packaging for re-use.

Power lead and battery charging

■ If the power lead supplied is not suitable for your AC connection, do not use an adaptor. Always use a Megger approved power lead

■ Use the supplied AC lead ONLY

■ Supply voltage: 90 to 265 V rms ac at 50 / 60 Hz.

■ A red LED illuminates when line power/mains is present.

■ The battery will charge when an AC source is connected, except when a test is in progress.

■ For optimum battery life, charge the battery after each use. Full charge duration is 2.5 hours.

■ The battery must be charged between 0 °C and 40 °C ambient temperature. If the battery detects a temperature outside this range the battery symbol will ﬂash and charging will be prevented.

DLRO100EB

CAT IV 600 V

IP 54

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DLRO100EB

Made in UK by Megger

N13117

90-264 V 47-63 Hz 500 VA

DLRO100EB

Made in UK by Megger

Functional veriﬁcation

Simply turning on the instrument at the test mode switch will initiate a start-up process and the display will respond. The initialisation screen (right) shows the ﬁrmware version.

Calibration

The DLRO100 is supplied with a calibration certiﬁcate. An ISO17025 (UKAS) Calibration Certiﬁcate is available if ordered with the instrument.

Storage

Instruments should be stored within its temperature and humidity speciﬁcations.

Intermittent operation limits

The DLRO100 is a high-power instrument and, as such, can generate signiﬁcant heat. To prevent damage, the instrument contains internal thermal protection which can disable the test current if excessive temperature rise is detected. In this event, the thermometer symbol will be displayed on the screen. If this should occur, switch the instrument off and allow it to cool before repeating the test. If possible, do not position the instrument in direct sunlight.

www.megger.comDLRO100E, 100X & 100H – 100A

Operating instructions

100A

50A

10A

Ω

100A

50A

10A

General operation

The DLRO100E, 100X and 100H are primarily controlled by two rotary switches and a TEST button used to start and stop a test (see section entitled, “Instrument control and indicators”).

AUTO

MAN

Test Mode rotary switch

The Test Mode rotary switch includes an ‘OFF’ position; the instrument switches on by rotating the switch clockwise from this position. Test modes provided are:

MAN

Manual Auto Continuous

AUTO

Range rotary switch

A light blue coloured section which denotes memory functions; delete

10A

Ω

50A

100A

DLRO100

AUTO

MAN

TEST

records; download records via USB or Bluetooth® and retrieve records. (100X and 100H Only)

A spanner enabling instrument and test settings.

A custom test selection, 10 A, 50 A and 100 A pre-set test currents.

Save button (100X and 100H only)

MAX

600 V

Backlight button

C1 - - C2

P1 - - P2

10A

Ω

50A

100A

MAX

600 V

MAX

600 V

MAX

600 V

CAT IV

600 V

TEST

Navigate via Directional and an OK buttons

TEST button to start and stop a test.

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Lead connections

Test Leads

DLRO100

C1 - - C2

P1 - - P2

AUTO

MAN

TEST

10A

Ω

50A

100A

Section of test piece under test.

P1 P2

Leads connected to the instrument with the Kelvin arrangement below showing correct positioning of Current (C1,C2) and Potential probes (P1,P2).

The earth terminal

g is used to detect ﬂoating voltage on the

test subject relative to the DLRO 0 V. High ﬂoating voltage on the test subject could present a hazard to the user and the DLRO. If the test subject is ±200 mV from the DLRO 0 V, test will be inhibited.

The current terminals (C1 and C2) must be connected outside of the potential terminals (P1 and P2), to ensure accurate readings.

P1 P2

DualGround™ and DC Clamp connection

As an additional safety precaution, perform the test with both ends of the test object grounded.

Connect the DC clamp to one of the ground connections. The DC clamp measures current ﬂowing through the ground loop and the DLRO100 compensates for this current loss automatically resulting in a more reliable reading.

Refer to the MCPD100L manual for how to use the DC current clamp.

Connect the earth connector to a suitable earth.

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