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Megger DLRO2X
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Megger Megger DLRO2X Manual

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Test Equipment Depot - 800.517.8431 - 5 Commonwealth Ave, MA 01801 - TestEquipmentDepot.com
DLRO2 and DLRO2X
Ducter™ Low Resistance Ohmmeter 2 A
User Guide
Page 2
Megger Ltd reserves the right to alter the specification of its products from time to time without notice. Although every effort is made to ensure the accuracy of the information contained within this document it is not warranted or represented by Megger Ltd. to be a complete and up-to-date description.
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Declaration of Conformity
This manual supersedes all previous issues of this manual. Please ensure that you are using the most recent issue of this document. Destroy any copies that are of an older issue.
Hereby, Megger Instruments Limited declares that radio equipment manufactured by Megger Instruments Limited described in this user guide is in compliance with Directive 2014/53/EU. Other equipment manufactured by Megger Instruments Limited described in this user guide is in compliance with Directives 2014/30/EU and 2014/35/EU where they apply.
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Contents
1. Introduction ................................................................................................................................... 7
1.1. Product Description ................................................................................................................................. 7
1.2. Features .................................................................................................................................................... 7
1.3. Difference Meter .....................................................................................................................................7
1.4. Applications ............................................................................................................................................. 8
1.5. Company web site ................................................................................................................................... 9
2. Safety Warnings ............................................................................................................................ 10
2.1. Warnings, Cautions and Notes ...............................................................................................................10
2.1.1. Warnings ..............................................................................................................................................10
2.1.2. Cautions ...............................................................................................................................................10
2.1.3. Notes .................................................................................................................................................... 10
2.2. Safety warnings ....................................................................................................................................... 10
2.3. Test lead safety warnings ....................................................................................................................... 11
2.4. Installation Category Definitions............................................................................................................11
2.5. Safety, Hazard and Warning Symbols on the Instrument .....................................................................12
2.5.1. Warning Icons ....................................................................................................................................... 12
3. Instrument Controls .....................................................................................................................13
3.1. Instrument Layout DLRO2 ....................................................................................................................... 13
3.2. Instrument Rotary Control DLRO2..........................................................................................................14
3.3. Instrument Rotary Control DLRO2X ....................................................................................................... 14
3.4. Instrument Display ..................................................................................................................................16
3.5. Leads, power and USB connections ........................................................................................................ 17
3.6. The Difference Meter ..............................................................................................................................17
4. Setting up the DLRO2 ...................................................................................................................19
4.1. Warnings and exception conditions ....................................................................................................... 19
4.2. Power .......................................................................................................................................................19
4.2.1. First use ................................................................................................................................................19
4.2.2. Turn the instrument on and off .............................................................................................................19
4.2.3. Battery options ......................................................................................................................................19
4.2.4. Setting Date and Time (DLRO2X) ........................................................................................................... 19
4.2.5. Setting test limits (DLRO2X) ...................................................................................................................20
4.2.6. Test limit warnings (DLRO2X) ................................................................................................................. 21
5. Data Storage (DLRO2X only) ........................................................................................................ 22
5.1. Create folder for test results ................................................................................................................... 22
5.2. Save test results .......................................................................................................................................23
5.3. Auto Save test results .............................................................................................................................. 24
5.4. Review Asset results ................................................................................................................................25
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6. Tests: Inductive mode ...................................................................................................................26
6.1. Manual stop ............................................................................................................................................. 26
6.1.1. First test ................................................................................................................................................ 26
6.1.2. Second test ........................................................................................................................................... 27
6.2. Auto stop .................................................................................................................................................28
6.2.1. First test ............................................................................................................................................... 28
6.2.2. Second test ........................................................................................................................................... 29
7. Tests, Resistance mode ..................................................................................................................30
7.1. Auto-start, bidirectional / unidirectional resistance mode ................................................................... 30
7.1.1. Post auto-start, unidirectional test .........................................................................................................31
7.1.2. Post auto-start, bidirectional test ...........................................................................................................31
7.2. Manual, bidirectional / unidirectional resistance mode........................................................................32
7.2.1. For a unidirectional test ......................................................................................................................... 33
7.2.2. For a bidirectional test ........................................................................................................................... 33
7.2.3. After the test ........................................................................................................................................33
8. Tests, Long leads mode ................................................................................................................. 34
8.1. Long leads mode – auto and manual start ............................................................................................ 34
8.1.1. For manual mode .................................................................................................................................. 35
8.1.2. For auto mode ......................................................................................................................................35
9. Noise rejection mode (DLRO2X only) ...........................................................................................37
9.1. Confidence Meter™ ................................................................................................................................ 37
10. Error and Warning Conditions....................................................................................................39
10.1. Error code categorization ..................................................................................................................... 39
10.2. On screen error messages .....................................................................................................................39
10.2.1. Error screen A .....................................................................................................................................39
10.2.2. Error screen B ...................................................................................................................................... 39
10.2.3. Fuse failure..........................................................................................................................................39
11. Settings ........................................................................................................................................ 40
11.1. General settings ..................................................................................................................................... 40
11.2. Pass Colour settings (DLRO2X) .............................................................................................................. 41
11.3. Date and Time settings (DLRO2X) ........................................................................................................42
11.4. Language settings .................................................................................................................................42
11.5. Instrument Information ........................................................................................................................43
11.6. Firmware update ................................................................................................................................... 43
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12. Maintenance ................................................................................................................................ 44
12.1. General Maintenance ............................................................................................................................ 44
12.2. Cleaning ................................................................................................................................................. 44
12.3. Battery .................................................................................................................................................... 44
12.3.1. Battery status ...................................................................................................................................... 44
12.3.2. 12 V supply ......................................................................................................................................... 45
12.3.3. Battery Charging ................................................................................................................................. 45
12.3.4. Battery error screens ............................................................................................................................ 45
12.4. Battery Replacement ............................................................................................................................. 46
12.4.1. Replace batteries and remove isolation tab .......................................................................................... 46
12.5. Restore Factory Settings ........................................................................................................................ 47
13. Specifications ............................................................................................................................... 48
14. Accessories and Equipment ........................................................................................................ 50
14.1. Included Accessories .............................................................................................................................. 50
14.2. Optional Accessories..............................................................................................................................50
14.3. Download PowerDB .............................................................................................................................. 51
15. Calibration, Repair and Warranty ..............................................................................................52
15.1. Return procedure ..................................................................................................................................52
16. Decommissioning ........................................................................................................................ 53
16.1. WEEE Directive ......................................................................................................................................53
16.2. Battery disposal .....................................................................................................................................53
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Introduction
1. Introduction
This user guide details the operational and functional details of the Megger DLRO2 and DLRO2X Ducter Low Resistance Ohmmeter 2 A. Please read this user guide fully before attempting to use the DLRO2 units.
1.1 Product Description
The DLRO2 range are tough and truly hand held 2 A low resistance ohmmeters, designed to provide fast, accurate and repeatable measurements even in electrically noisy environments.
The DLRO2 range have been designed for ease of use, they can be operated by non-technical users with minimal training.
DLRO2 DLRO2X
There are three main measurement modes: There are four main measurement modes:
 Normal resistance (µΩ)  Normal resistance (µΩ)
 Fast / long test lead (mΩ)  Fast / long test lead (mΩ)
 Inductive resistance (µΩ)  Inductive resistance (µΩ)
 Noise rejection mode (mΩ)
The DLRO2 units are supplied with six HR6 rechargeable NiMH cells which can be charged in the instrument using the supplied external power supply. Non-rechargeable Alkaline AA cells can also be used.
For personal safety and to get the maximum benefit from this instrument, make sure that the safety warnings and instructions are read and understood before the instrument is used. Refer to 2. Safety Warnings on page 10
NOTE : This user guide includes instructions for all DLRO2 variants. Some facilities may not be available on your model of this equipment.
1.2 Features
 Noise rejection mode (DLRO2X only). Refer to 9. Tests: Noise rejection mode (DLRO2X) on page 37
 Data and results storage option (DLRO2X only). Refer to 5. Data storage (DLRO2X only) on page 22
 ‘Difference Meter’ for quick comparison of results. Refer to 3.6 The Difference Meter on page 17
 Rotary dial test function selection.
 Unidirectional or bidirectional test options on normal resistance test mode.
 Secondary display field showing either forward and reverse measurement results or previous two test results,
allowing three test results to be on display at any time for easy comparison.
 Current reversal capability to cancel standing EMF.
 Noisy connection warning, showing when electrical noise or noise from poor clip / probe connections is present.
 Test currents selectable from 1 mA to 2 A
 Capable of 500 measurements from a single charge.
 Supplied with compact CAT III 600 V / CAT IV 300 V rated kelvin clip test leads.
1.3 Difference Meter
The Difference Meter allows repetitive measurements to be easily compared with an initial reference measurement. The Difference Meter translates percentage difference to a needle / pointer movement making it easy to see changes in value.
A new reference measurement can be set at any time at the push of a button.
Refer to 3.6 The Difference Meter on page 17
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Introduction
1.4 Applications
The DLRO2 range measures low resistance values in applications ranging from railways and aircraft to resistance of components in industry. Any metallic joint can be measured but users must be aware of measurement limitations depending on application. For example, if a cable manufacturer plans to make resistive measurements on a thin wire, a low test current should be selected to prevent heating the wire thereby changing its resistance.
This instrument is suited to measuring thick conductors, bonds and quality of welding.
Measurements on electric motors and generators will be inductive and require the user to understand the inductive mode and charging process before a correct result is achieved.
Electromagnetic noise induced into the leads can interfere with a reading. A noise icon alerts the user, but does not prevent a measurement.
The DLRO2X features a noise rejection mode that incorporates the Confidence Meter™ (Refer to 9. Tests: Noise rejection mode (DLRO2X) on page 37). This makes the DLRO2X ideal for testing in high noise applications such as wind turbines, switch yards, and heavy industrial locations.
When dissimilar metals are joined a galvanic effect is created. Users should select a bidirectional mode to make sure this effect is cancelled. The instrument measures with current flowing in both directions and averages the result.
 Aviation – Lightning protection testing measuring mΩ resistance between receptors. Wing tip to wing tip etc.,
using long test leads. Optional long cable reel test leads are available, can be used for assembly of components, interconnection of equipment, repair and maintenance.
 Wind turbines – Lightning protection, measuring mΩ resistance between wing tip to ground connection at base
using long test leads. Optional long cable reel test leads are available.
 Rail – Tram and Underground - rolling stock and infrastructure, track high current joints, signalling systems.
 Marine - Power wiring systems, protection systems, ship to shore bonding, cathode protection system testing.
Cable laying applications.
 Oil and gas pipelines - Bonding between welded joints, grounding systems.
 Automotive and EV - Battery connections, weld quality, quality of crimped connections,
assembly robot welding cables.
 Cable manufacturers - Quality control, cable length.
 Component manufacturers - Quality control.
 Space exploration and engineering - structural metal to metal, ground network metal to metal, carbon fibre to
metal, carbon fibre to carbon fibre.
 Data Centres - During electrical installation of main panel, generator and UPS systems. Verification of protective
device contact resistance, busbar parallel feeds, busbar lapped joints, optimum resistance over torque and cable lug to busbar connections. During maintenance using trending data for all aspects of the above, verification after repair.
 Medical hand held opportunity - earthing and bonding systems for protection against microshock and
macroshock.
 Panel / Switchgear Manufacturers - End of production line testing, site commissioning, maintenance and fault
finding.
 Robotics - Wiring systems and connections which are subject to stress / movement / vibration, bonding of
component parts to minimise static, grounding of machine, welding leads of robot spot welder.
 Electrical infrastructure - Cable resistance from one end, cable length, identification of parallel supplies while
connected, cable to lug to connection fault finding, checking assembled connections main supply cables and panels, switch gear and protective devices, ups and changeover panels, interlinking busbars, interlinking cables, distribution and PDU boards, lightning protection systems, final circuits.
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Introduction
1.5 Company web site
Occasionally an information bulletin may be issued via the Megger web site. This may concern new accessories, new usage instructions or a software update. Please occasionally check on the Megger web site for anything applicable to your Megger instruments.
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Safety Warnings
2. Safety Warnings
The safety instructions given in this document are indicative of safe practice and are not to be considered exhaustive. Additionally, they are not intended to replace local safety procedures in the region where the instrument is used. If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. There are no user replaceable parts within the DLRO2.
2.1 Warnings, Cautions and Notes
This user guide follows the internationally recognized definition of warnings, cautions and notes. These instructions must be adhered to at all times.
2.1.1 Warnings
Warnings alert the reader to hazardous situations where injury to personnel can occur. They are set in red type to make them stand out. They are placed before the item to which they relate and repeated at each applicable occasion.
2.1.2 Cautions
Cautions alert the reader to situations where equipment damage may result if a process is not followed properly. They are set in bold type. They are placed before the item to which they relate and repeated at each applicable occasion.
2.1.3 Notes
Notes give additional important information that will help the reader. They are not used when a Warning or Caution is applicable. They are not safety related and may be placed either before or after the associated text as required.
2.2 Safety warnings
These safety warnings must be read and understood before the instrument is used. Retain for future reference.
WARNING : This instrument must be operated only by suitably trained and competent people. Protection provided by the instrument may be impaired if it is not used in a manner specified by the manufacturer.
 Local Health and Safety Legislation requires users of this equipment and their employers to carry out valid risk
assessments of all electrical work to identify potential sources of electrical danger and risk of electrical injury such as inadvertent short circuits. Where the assessments show that the risk is significant the use of fused test leads may be appropriate.
 If battery power is lost during the test, then the user will no longer be warned that the load is being discharged.
The user must check by independent means that the load is discharged before breaking connection.
 Disconnect all test leads and switch the instrument OFF before opening the battery cover. Covers must be in
place before reconnecting the test leads.
 Ensure every cell in the battery compartment is of identical type. Never mix rechargeable and non-chargeable
cells.
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 This product is not intrinsically safe. Do not use it in an explosive atmosphere.
 Protection provided by the instrument may be impaired if it is not used in a manner specified by the
manufacturer.
 The voltage warning function will operate only if the instrument is switched on and working correctly.
In the absence of an indication do not assume that there are no hazardous voltages.
 The voltage indicator and current discharge features must be regarded as additional safety features and MUST
not substitute the normal safe working practice which MUST be followed.
 The instrument must not be used if any part of it is damaged or if the terminal shutter is missing.
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Safety Warnings
 The circuit under test must be switched off, de-energized, securely isolated and proved dead before test
connections are made.
 Circuit connections, exposed conductive parts and other metalwork of an installation or equipment under test
must not be touched during testing.
 Only Megger approved test leads with right-angled instrument connectors must be used with this instrument.
Test leads must be at least 1 m in length and provide a total loop impedance ≥ 26 mΩ.
 When inductive loads are measured it is essential that the current carrying leads are securely clamped to the item
being tested and that they are not removed before any stored charge has been discharged at the end of the test. Failure to comply with these instructions might result in an arc being produced which might be dangerous for the instrument and the operator.
 All test leads, probes and crocodile clips must be in good order, clean and with no broken or cracked insulation.
Verify the integrity of the test leads before use.
 The safe maximum limit of a measurement connection is that of the lowest rated component in the
measurement circuit formed by the instrument, test leads and any accessories.
 Ensure that hands remain behind finger guards of probes and clips.
2.3 Test lead safety warnings:
 Test leads, including crocodile clips, must be in good condition, clean, dry, and free of broken or cracked
insulation. The lead set or its components must not be used if any part of it is damaged.
 The safe maximum limit of a measurement connection is that of the lowest rated component in the
measurement circuit formed by the instrument, test leads and any accessories.
2.4 Installation category definitions:
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.
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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Safety Warnings
i
2.5 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.
Equipment complies with current EU directives.
Equipment complies with current UKCA directives.
Equipment complies with current ‘C tick’ requirements.
Do not dispose of in the normal waste stream.
Equipment protected throughout by double insulation.
IP54 IP rating
2.5.1 Warning Icons
This paragraph details the warning icons that can show on the display.
Icon Warning Description
If an external voltage is applied between the terminals and the instrument is set to ON, the external voltage warning will flash on the display. This is a warning that the item under test is live, it might be dangerous so testing is disabled. The external voltage
External Voltage Warning
warning message will flash if more than 5 V potential difference is applied between the voltage terminals and the current terminals. This warning will not show if all terminals are at the same external voltage.
NOTE: The warning will not operate if the instrument is set to OFF.
Internal Error Warning. To clear the error, switch the instrument
Internal Error Warning
OFF and then back ON. Contact Megger if this does not clear the error.
Refer to the user guide if this message shows.
Read the User Guide
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3. Instrument Controls
3.1 Instrument Layout DLRO2 and DLRO2X
Front View Rear View
2
3
Instrument Controls
1
10
6
7
9
Item Description Item Description
1 External electrical connections.
Refer to 3.5 Leads, power and USB connections on page 16
2 Display 11 Battery cover
3 Soft keys (multifunction) 12 Stand
4 Test Limits On or Off (DLRO2X)
5 Back-light control
6 Save results / Auto Save On (DLRO2X)
7 Test
8 TICK button
9 Rotary selection switch
4
5
8
10 Attachment point for strap
11
12
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Instrument Controls
3.2 Instrument Rotary Controls DLRO2
2
3
4
Item Description Item Description
Rotary switch positions
1 Inductive mode 4 Long leads mode
2 Normal resistance mode 5 Settings mode (grey)
3 Off position
1
5
3.3 Instrument Rotary Controls DLRO2X
2
3
4
Item Description Item Description
Rotary switch positions
1 Inductive mode 5 Settings mode (grey)
2 Normal resistance mode 6 Noise rejection mode
3 Off position 7 Data storage mode (blue)
4 Long leads mode
1
6
7
5
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3.4 Instrument Display
Instrument Controls
1
16
15
14
13
12
17 18
3 4
52 19
6
7
8
9
10
Item Description Item Description
1 Difference Meter. (Refer to 3.6 The
Difference Meter on page 17)
11 Soft keys functions (dependant on rotary
selection switch position)
Confidence Meter™ on DLRO2X (Refer to
9. Tests: Noise rejection mode (DLRO2X) on page 37)
2 Operating mode 12 Secondary field
3 Primary field 13 C continuity indicator
4 Latest result 14 Forward measurement result
5 Battery condition indicator 15 Unidirectional or bidirectional selection
6 Noise indicator 16 Inductive charge warning
7 Units of measure (for latest result) 17 Time (DLRO2X only)
8 Reverse measurement result 18 Auto Save activated (DLRO2X only)
9 Selected test current 19 Test Limits warning indicator (DLRO2X only)
10 P continuity indicator
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Instrument Controls
Confidence Meter™
When High noise mode is selected on the DLRO2X the Difference Meter becomes the Confidence Meter™.
Refer to 9. Tests: Noise rejection mode (DLRO2X) on page 37
3.5 Leads, power and USB connections
Slider to front Slider to back
1
3
4
2
5
7
1
7
Item Description Item Description
1 Rear attachment point for strap 4 Slider in rear position
2 Slider in front position 5 Battery charger connection
3 Connections: C1, P1, P2, C2 6 USB port (firmware updates
or Data transfer (DLRO2X only) via USB stick)
7 Front
6
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Instrument Controls
3.6 The Difference Meter
The Difference Meter is a feature on the DLRO2 / DLRO2X that is displayed at the top of the primary screen (marked ‘1’ on the diagram).
The Difference Meter works in inductive and resistive modes only. It can be toggled off and on in the instrument settings, giving space for other characters in the primary field to be displayed in a larger format making them easier to read, if required. Refer to 9.1 General Settings on page 28.
Repetitive measurements can be easily compared with an initial reference measurement. The Difference Meter translates percentage difference to a needle / pointer movement making it very easy to see change. The green marker shows the initial or reference reading. Noisy results are shown with a red marker. Good results are shown with a blue marker. When testing, pressing the TICK button ( other readings recorded on display, including those on the Difference Meter and the secondary field.
) sets the latest reading as the reference reading and cancels all
2
3
4
1
Item Description Item Description
1 Difference Meter 4 Blue result marker shows that noise is
not present. Open circle for latest result / solid circle for previous result
2 Red result marker shows that noise
is present. Open circle for latest result / solid circle for previous
5 Latest measurement showing
percentage difference compared to initial reference measurement
result
3 Reference measurement, green
5
-7%
NOTE : All markers are positioned in chronological order. The most recent is positioned high on the Difference Meter line, the oldest is positioned lowest.
3.7 Difference Meter example of operation
This explanation of the Difference Meter is written in reference to resistance mode but the explanation applies equally to inductive mode.
Resistance measurement is selected. The Difference Meter is inactive. Continuity is indicated for C and P leads
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Instrument Controls
First measurement is complete. The Difference Meter is now active. The first measurement is shown as a green ring at the centre of the scale with +0% below.
A second measurement is made, the Difference Meter shows result relative to reference measurement (+30% in this case) showing an increase. Shown as a blue ring
NOTE : For each successful measurement the needle leaves a blue marker on the Difference Meter (a red marker if the reading contains noise).
Third measurement is made, the Difference Meter shows it’s result relative to the first (>+1000% in this case) showing an increase.
The 1000% difference shows clearly that something isn’t right. Check the leads, connections, unit under test, etc.
NOTE : The units on the main display have changed from µΩ to mΩ and are now indicated in blue to highlight the change.
Fourth measurement is made, the Difference Meter shows it’s result, again relative to the first measurement. The new reading is -1% showing a possible return to the expected result.
NOTE : The units on the main display have changed back to µΩ and are shown in blue indicating another change.
Fifth measurement is made, the Difference Meter shows it’s result, relative to the reference measurement. This reading is now just -1% lower than the reference measurement.
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NOTE : NThe units remained unchanged as µΩ and are shown in black.
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Setting up the DLRO2 and DLRO2X
4. Setting up the DLRO2 and DLRO2X
Before each use visually inspect all equipment about to be used. Check the instrument is in good condition and there is no visible damage to either the instrument or the test leads. Confirm the instrument case, test leads and connectors are in good condition with no damaged or broken insulation
4.1 Warnings and exception conditions
Refer to 10. Error and Warning Conditions on page 39
4.2 Power
4.2.1 First use
NOTE : Before the DLRO2 can be turned on the battery isolation tab must be removed.
1. Remove the battery cover.
2. Pull the battery isolation tab clear of the batteries.
3. Replace cover.
For further details on accessing the battery panel, Refer to 12.4 Battery Replacement on page 46.
4.2.2 Turn the instrument on and off
1. Turn the instrument ON by rotating the rotary switch to the required operating mode (away from the OFF position).
2. Turn the instrument OFF by rotating the rotary switch to the OFF position.
4.2.3 Battery options
CAUTION : Do not attempt to recharge alkaline cells, this action is a high potential fire hazard.
The DLRO2 is powered by Internal batteries,
 These cells may be used:
6 x LR6 1.5 V Alkaline (AA)
6 x IEC HR6 1.2 V NiMH
The DLRO2 is charged using the supplied mains adapter (NiMH cells only), which will work at voltages between 100 V and 240 V AC. Ensure the correct battery type is selected in the setting menu. Charging will only occur if the battery type is set to NiMH. Refer to 11. Settings on page 40.
WARNING : Charge NiMH cells only between 0 ºC and 40 ºC ambient temperature.
4.2.4 Setting Date and Time (DLRO2X)
To set the Date and Time please Refer to 11.3 Date and Time settings (DLRO2X) on page 42
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Setting up the DLRO2 and DLRO2X
4.2.5 Setting test limits (DLRO2X)
Switch the rotary switch to the settings mode (Refer to 9.1 General settings on page 28).
1. Use the arrow keys to select the Lower Test Limit and click the TICK button ( ) to select.
2. Use the soft keys 1 or 4 to move the selector left or right to choose the Units of measurement and the limit required. Use the up and down arrows (soft keys 2 and 3) to select the numbers..
3. When the selection is complete use soft key 4 to click the TICK ( ) and to save your test limit
settings.
4. Go back to the main Settings menu and do the same for the Upper Test Limit.
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4.2.6 Test limit warning (DLRO2X)
When the test limit is reached a visual and audible warning will appear on the display. This can be set to three settings:
1. Off (shown)
2. Visual warning
3. Visual and audible warning
When the visual warning is activated an eye symbol
( ) will appear at the top of the display.
Setting up the DLRO2 and DLRO2X
When the visual and audible warning is activated this symbol ( ) will appear at the top of the display.
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Data storage (DLRO2X only)
5. Data storage (DLRO2X only)
The DLRO2X can save results to a folder which can then be transferred onto a USB data stick to transfer to your PC.
5.1 Create folder for test results
1. Turn rotary switch to select the Data Storage mode.
The Default Asset ID can be used to save results or a new one can be created.
2. To create a new Asset ID, click the ✚ key.
3. Use the soft keys to move the cursor around the keyboard and click the TICK button ( ) to select.
4. Press SAVE ( ) and the new Asset ID will appear on the Data storage home page. Use the up and down arrows to select the Asset folder that you wish to save your results in. The Asset with the SAVE icon
saving results. (Refer to 5.3 Auto Save test results on page 24)
5. To view the results, click the TICK button ( ).
next to it will be used for
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5.2 Save test results
1. To save your test results when the test has completed press the SAVE button
2. On the Data storage page use the soft keys to select the Asset ID that you require the results to be added to and
click the TICK button ( ).
.
Data storage (DLRO2X only)
3. You will then see confirmation that the results have been saved.
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Data storage (DLRO2X only)
5.3 Auto Save test results
1. On the Data storage page use the soft keys to select the Asset ID that the Auto Saved results will be added to. The SAVE icon ( Asset ID.
2. Before starting the test, press the SAVE ( ) button. The Auto Save icon will appear at the top of the screen.
will appear next to the chosen
)
3. Run the test and the results will automatically be saved to the previously selected Asset ID.
4. When the results are saved in the Asset ID a pop up will appear with the Asset ID name.
5. To view the results, turn the rotary switch to Data Storage mode, select the Asset ID and click the TICK button ( ) until the desired results are on screen.
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5.4 Review Asset results
1. On the Data storage page use the soft keys to select the Asset ID that you want to open and click the TICK button ( ).
2. Select the date of the test results that you want to review.
Data storage (DLRO2X only)
3. Select the type of test from the list.
4. Choose the time that the test was taken.
5. The results for that test on the chosen date will appear on screen. Use the soft keys to navigate up and down or delete the results.
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Tests: Inductive mode
6. Tests: Inductive mode
Inductive test mode allows users to measure resistance of an inductive load (i.e. motors, small power transformers, etc.).
Test current can measure up to 1 A.
NOTE : Pre-charging; before any measurement can be made, the circuit needs to be ‘pre-charged’.
This is carried out at a low current (1 mA) and is indicated on the display by an animated sequence of chevrons (< << <<< <<<<). The animation will be displayed until the pre-charge phase is complete.
WARNING : When inductive loads are measured it is essential that the current carrying leads are securely clamped to the item being tested and that they are not removed before any stored charge has been discharged at the end of the test. Failure to comply with these instructions might result in an arc being
produced which might be dangerous for the instrument and the operator.
6.1 Manual stop
1. Turn rotary switch to select the inductive mode position.
6.1.1 First test
NOTE : To AUTO SAVE results click the SAVE (
now (Refer to 5. Data storage (DLRO2X only) on page 22).
Inductive test screen appears, ‘Inductive Mode’ shows in secondary field for a short time then disappears.
NOTE : Soft key 1 toggles manual / auto stop.
2. Select MANUAL on soft key 1.
3. Connect C1-C2 and P1-P2 to the instrument and the unit
under test.
C and P indicators show red background with continuity or green background with for good continuity. Proceed when both show . The continuity indicators are active during the test and will update if continuity changes.
) button
for no
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4. To start the test press the TEST button.
Resistance and current values continually up date on screen. The current starts at 1 mA and can reach a maximum of 1 A if a higher current is required for the resistance being measured.
End of the test
Tests: Inductive mode
To stop the test press the TEST button. NOTE: The TICK button (
Click SAVE now if you wish to record your results.
WARNING : Do not disconnect test leads until discharge is completed.
During the discharge phase, the buttons and rotary switch will be inactive. While discharging is still in progress a warning symbol ( sound. Do not remove the test leads until discharge is complete and the warning disappears.
6.1.2 Second test
1. To start the test press the TEST button.
The animated chevron sequence will be displayed during the pre-charge phase of the measurement, to be replaced by resistance and current values updating as the instrument auto-ranges.
Readings continue to update until a stable measurement is achieved.
F) will flash on the left of the screen and an audible warning buzzer will
) will set a new reference value.
2. When the result is stable press the TEST button.
The Difference Meter records the reading.
End of the test
To stop the test press the TEST button. NOTE: The TICK button (
Click SAVE now if you wish to record your results.
WARNING : Do not disconnect test leads until discharge is completed.
During the discharge phase, the buttons and rotary switch will be inactive. While discharging is still in progress a warning symbol (
will sound. Do not remove the test leads until discharge is complete and the warning disappears.
NOTE : If continuity is lost from either the C or P connection during a test, this screen will be displayed for 3 seconds. The DLRO2 will then return to the start of the test.
F) will flash on the left of the screen and an audible warning buzzer
) will set a new reference value.
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Tests: Inductive mode
6.2 Auto stop
1. Turn rotary switch to select the inductive mode position.
NOTE : To AUTO SAVE results click the SAVE (
now (Refer to 5. Data storage (DLRO2X only) on page 22).
6.2.1 First test
Inductive test screen appears, ‘Inductive Mode’ shows in secondary field for a short time then disappears.
NOTE : Soft key 1 toggles MANUAL / AUTO.
2. Select AUTO on soft key 1.
) button
3. Connect C1-C2 and P1-P2 to the instrument and the unit under test.
C and P indicators show red background with
for no continuity or green background with for good continuity. Proceed when both show . The continuity indicators are active during the test and will update if continuity is lost.
4. To start the test press the TEST button.
During the test results will live update on screen. The test will stop automatically when the instrument determines that the reading has been stable for long enough and is unlikely to change significantly; the user can override the instrument and stop the test at any time by pressing the TEST button.
The Difference Meter is active. When the test is stopped the displayed result is static.
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Tests: Inductive mode
End of the test
When the test stops, either automatically or after the user has pressed the TEST button, the instrument will enter the discharge phase.
Click SAVE now if you wish to record your results.
WARNING : Do not disconnect test leads until discharge is completed.
During the discharge phase, the buttons and rotary switch will be inactive. While discharging is still in progress a warning symbol ( sound. Do not remove the test leads until discharge is complete and the warning disappears.
) will flash on the left of the screen and an audible warning buzzer will
F
NOTE : The TICK button (
6.2.2 Second test
1. To start the test press the TEST button.
Previous result moves to secondary display. Primary display shows 3 dashes till a new valid reading is received.
The readings will update until a stable measurement is achieved, at which point the instrument will automatically stop the test. The test can also be stopped at any time by pressing the TEST button
After the test, the Difference Meter records the reading and primary screen will show the result.
NOTE : ‘Two previous results’ in the secondary screen, left is previous result and right is the result before that.
) will set a new reference value.
CAUTION : If the reading is unstable the DLRO may not auto stop. The user will need to manually stop the test.
When the test stops, either automatically or after the user has pressed the TEST button, the instrument will enter the discharge phase.
Click SAVE now if you wish to record your results.
WARNING : Do not disconnect test leads until discharge is completed.
During the discharge phase, the buttons and rotary switch will be inactive. While discharging is still in progress a warning symbol ( will sound. Do not remove the test leads until discharge is complete and the warning disappears.
NOTE : The TICK button (
) will flash on the left of the screen and an audible warning buzzer
F
) will set a new reference value.
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Tests: Resistance mode
7. Tests: Resistance mode
Resistance mode measures the resistance of a unit under test in a forward current direction (unidirectional mode) or forward and reverse direction (bidirectional mode). In manual start mode, the test will be carried out when the TEST button is pressed. In auto start mode the DLRO2 will start the test automatically as soon as continuity is detected, however it will not automatically start testing if continuity is established before the test mode is selected.
7.1 Auto-start, bidirectional / unidirectional resistance mode
1. Turn rotary switch to select either the auto-start, bidirectional resistance mode position or auto-start, unidirectional resistance mode position.
NOTE : To AUTO SAVE results click the SAVE (
now (Refer to 5. Data storage (DLRO2X only) on page 22).
) button
OR
Resistance test screen appears, ‘Auto-start, Bidirectional Resistance Mode’ or ‘Auto-start, Unidirectional Resistance Mode’ shows in secondary field for a short time then disappears.
NOTE : Soft key 1 toggles continuous / single test. Soft keys 2 / 3 cycles through current ratings; default is 2 A, selectable 1 A, 100 mA, 10 mA, 1 mA. In bidirectional, soft key 4 toggles between ‘Display previous 2 results’ and ‘Forward and reverse direction’.
2. Select test settings using the soft keys.
3. Connect C1-C2 and P1-P2 to the instrument and the unit under test.
C and P indicators show red background with continuity or green background with for good continuity.
When continuity is detected on both circuits, the C and P indicators will both be greyed out and the test will start automatically.
for no
30
If required, to stop the test press the TEST button.
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The dashes (or an old result) will flash until a new result is displayed.
During the test, continuity indicators will fade and soft keys will be inactive.
For bidirectional tests, the dashes (or the previous result) and left hand arrow will flash while the instrument performs a reading in the forward direction. When the forward measurement is complete, it is shown next to the left hand arrow, and then the right hand arrow and the dashes (or the previous result) flash to indicate that the test current has been reversed.
For unidirectional tests, the dashes (or the previous result) will flash until a result is ready.
7.1.1 Post auto-start, unidirectional test:
After an auto-start, unidirectional test the C and P continuity indicators will be grey if continuity was maintained. This indicates the C or P lead must be disconnected and reconnected to restart the test.
Tests: Resistance mode
Note: Test button will start another test.
Soft key 1 toggles continuous / single test. Soft keys 2 / 3 cycles through current ratings; default is 2 A, selectable 1 A, 100 mA, 10 mA, 1 mA. Soft key 4 is inactive.
The TICK button (
) sets new reference value.
7.1.2 Post auto-start, bidirectional test:
After an auto-start, bidirectional test the C and P continuity indicators will be grey. This indicates the C or P lead must be disconnected and reconnected to start the next test.
If an auto-start test is interrupted by pressing the TEST button C and P continuity indicator will turn grey. This indicates the C or P lead must be disconnected and reconnected to restart the test. Alternatively press the TEST button to start another test.
Continuity on C or P has been lost. Re-establish continuity to start a new test.
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Tests: Resistance mode
7.2 Manual, bidirectional / unidirectional resistance mode
1. Turn rotary switch to select either the bidirectional resistance mode position or unidirectional resistance mode position.
NOTE : To AUTO SAVE results click the SAVE (
now (Refer to 5. Data storage (DLRO2X only) on page 22).
Resistance test screen appears, ‘Bidirectional Resistance Mode’ or ‘Unidirectional Resistance Mode’ shows in secondary field for a short time then disappears.
) button
OR
NOTE : Soft key 1 toggles continuous / single test. Soft keys 2 / 3 cycles through current ratings; default is 2 A, selectable 1 A, 100 mA, 10 mA, 1 mA. Soft key 4 is only active in bidirectional resistance mode and toggles between ‘Display previous 2 results’ / ‘Forward and reverse direction’. In unidirectional resistance mode soft key 4 is inactive and will default to ‘Display previous 2 results’.
2. Select test settings using the soft keys.
3. Connect C1-C2 and P1-P2 to the instrument and the unit under test.
C and P indicators show red background with
for no
continuity or green background with for good continuity.
32
Proceed when both show .
4. To start the test press the TEST button.
If required, to stop the test press the TEST button.
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7.2.1 For a unidirectional test:
As the test starts, continuity indicators will fade.
Dashes or previous value will flash on the main display until result appears.
On the secondary display dashes or previous results will flash until a new result is ready.
The soft keys will not operate during this test.
7.2.2 For a bidirectional test:
As the test starts, continuity indicators will fade.
The left arrow with dashes will flash first until a result appears, then the right arrow with dashes will flash until a result appears.
Dashes or previous value will flash on the main display until average of the two results appears.
Tests: Resistance mode
On the secondary display dashes or previous results will flash until a new result is ready.
The soft keys will not operate during this test.
7.2.3 After the test:
For a single test the result is displayed constant in the main field.
Click SAVE now if you wish to record your results.
To perform another test press the TEST button (continuity indicators must be green).
NOTE : Soft key 1 toggles continuous / single test. Soft keys 2 / 3 cycles through current ratings; default is 2 A, selectable 1 A, 100 mA, 10 mA, 1 mA. Soft key 4 is only active in bidirectional resistance mode and toggles between ‘Display previous 2 results’ / ‘Forward and reverse direction’.
TICK button sets new reference value.
For a continuous test results in the secondary screen will keep updating. Tests will be performed back to back. ‘Two previous results’ in the secondary screen, left is previous result and right is the result before that.
To stop the test press the TEST button.
If continuity is maintained, pressing the TEST button will start a new test
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Tests: Long leads mode
8. Tests: Long leads mode
Long leads resistance test mode has been designed for use with test leads of very long length.
The Difference Meter is disabled in long leads mode.
All readings are displayed in mΩ.
Minimum current is 1 A.
Restricted to single tests.
In long leads mode, all soft keys are inactive. The test is pre-set to single measurement, 1 A with previous 2 results displayed.
8.1 Long leads mode - auto and manual start
1. Turn rotary switch to select the long leads mode, either MANUAL or AUTO position.
OR
NOTE : To AUTO SAVE results click the SAVE (
now (Refer to 5. Data storage (DLRO2X only) on page 22).
Long leads test screen appears, either ‘Long Leads Mode ­Manual Start’ or ‘Long Leads Mode - Auto Start’ will show in the secondary field for a short time, the text then disappears to reveal the previous results fields.
2. Connect C1-C2 and P1-P2 to the instrument and the unit under test.
) button
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C and P indicators show red background with for no continuity or green background with
for good continuity.
8.1.1 For manual mode
Tests: Long leads mode
Proceed when both show green background with
.
3. To start the test press the TEST button.
During the test, continuity indicators will fade.
The dashes (or an old result) will flash until a new result is displayed.
On the secondary display dashes or previous results will flash until a new result is ready.
For a single test the result is displayed constant in the main field. No latest results are displayed in the secondary field unless multiple tests have been made in this sequence.
If continuity is maintained, pressing the TEST button will start a new test.
8.1.2 For auto mode
In auto-start mode the instrument will start the test when continuity is established. If both C and P continuity is made before the test mode is selected, the continuity flags will be shown in grey – this means that the user must disconnect and reconnect or press the TEST button to start the test.
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Tests: Long leads mode
During the test, continuity indicators will fade.
The dashes (or an old result) will flash until a new result is displayed.
On the secondary display dashes or previous results will flash until a new result is ready.
The test will run automatically.
If required, to stop the test press the TEST button or break continuity.
For a single test the result is displayed constant in the main field. No latest results are displayed in the secondary field unless multiple tests have been made in this sequence.
NOTE : The TICK button (
) will clear the previous results in
the secondary fields.
Two previous results appear in the secondary fields, left is the previous result and right is the result before that.
For auto single tests the continuity indicators are grey, indicating that to repeat the test the leads must be disconnected and reconnected again.
If the test has been stopped by the TEST button the continuity indicators will be grey.
If continuity already is shown on the C and P connectors press the TEST button to re-start the test.
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Tests: Noise rejection mode (DLRO2X)
9. Tests: Noise rejection mode (DLRO2X)
If the high noise indicator appears on the display while using either the normal mode, long test lead mode or the inductive mode, then the measurement is being affected by noise and the results may not be reliable. Noise can also cause consecutive readings to vary significantly. The cause of this is usually from a noise current flowing through the connection or joint being measured, or the induction of noise into the test leads. Interfering noise current will result in measurements that are not repeatable, varying, out of specification and not useable.
To assist with this situation the DLRO2X is equipped with a noise rejection test mode. In this test mode the current is passed continuously and in one direction only. The instrument then feeds a stream of measurements into our patented Confidence Meter™. The measurement is then refined until a stable, accurate measurement is obtained.
 All readings are displayed in mΩ.
 Minimum current is 1 A.
 Restricted to single tests.
 In high noise mode, all soft keys are inactive.
 The test is pre-set to single measurement, 1 A with previous 2 results displayed.
9.1 Confidence Meter™
1. If it is not possible to obtain a stable, accurate measurement in the normal, long lead or inductive test modes, turn the rotary switch to select the noise rejection mode feed them into the Confidence Meter™.
NOTE : To AUTO SAVE results click the SAVE (
now (Refer to 5. Data storage (DLRO2X only) on page 22).
2. Connect C1-C2 and P1-P2 to the instrument and the unit under test. Proceed when both show green background with
The test current applied will be continuous and up to 1A, so for this reason the instrument will start the measurement with a charging cycle similar to the inductive test mode. The test current will then be increased as high as possible, up to 1A.
3. To start the test press the TEST button. Once the first measurements start to appear on the display the Confidence Meter™ will start to operate. At the top of the display two markers will indicate the level of confidence the instrument has with the measurement. Starting far apart at 0% confidence.
, which will take a series of measurements and
) button
.
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Tests: Noise rejection mode (DLRO2X)
4. As the Confidence Meter™ starts to calculate and average out the measurements the displayed value will become more stable and the markers will start to move inwards as the confidence percentage increases. The markers also change colour as they move inwards, starting at red and changing to yellow and then green as confidence increases. In cases where noise levels are high or varying the pointers may move outwards and inwards as confidence fluctuates. .
5. When the test stops the instrument will enter the discharge phase.
WARNING : Do not disconnect test leads until discharge is completed.
During the discharge phase, the buttons and rotary switch will be inactive. While discharging is still in progress a warning symbol ( an audible warning buzzer will sound. Do not remove the test leads until discharge is complete and the warning disappears.
) will flash on the left of the screen and
F
6. The Confidence Meter™ will read 100%. The test leads can be disconnected and the results can be saved by clicking the SAVE (
When confidence reaches 100% the measurement will stop and the instrument will apply a discharge cycle, just in case the test piece was inductive. When complete the final value will be displayed and held, at this point the test limits, if enabled, will be applied and a pass or fail indicated.
In the event that noise is very high testing may continue for up to 5 minutes. If after this time 100% confidence has not been reached, the instrument will stop the test and indicate the level of confidence achieved and the best measurement value it has been possible to obtain. Should the user wish to stop the test earlier, the user can press the TEST button at any time.
There may be occasions where the measured value is actually stable, but the Confidence Meter™ is still indicating a lower level of confidence, such as 50% for example. In this situation the user may be happy with the stable value and choose to stop the test by pressing the TEST button. This is usually because the Confidence Meter™ is trying to resolve the measurement to a higher resolution than is currently displayed.
) button.
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Error and Warning Conditions
10. Error and Warning Conditions
If an error code appears on the display follow the on screen instructions.
10.1 Error code categorisation
Item Number Range Description User Action
1 1 - 999 Non dismissible errors Restart unit to recover.
2 1000 - 1999 User dismissible errors
3 2000 - 2999 Auto dismissible errors eg voltage present warning disappears when voltage
4 3000 - .... Logged only errors No user intervention
Press
goes
10.2 On screen error messages
10.2.1 Error screen A
1. Error code.
2. Error text, where applicable, explains what went wrong.
to continue
Remove the message by pressing the TICK button (
10.2.2 Error screen B
1. Error code.
2. Error text, switch the DLRO2 OFF then back ON. If the problem persists contact Megger.
10.2.3 Fuse failure
The fuses in DLRO2 are not user replaceable. If there is no continuity between the C terminals this will indicate that the internal fuse has been blown. The unit must be returned to Megger to be repaired. Refer to 15. Calibration, Repair and
Warranty on page 52.
).
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Settings
Megger DLR02 icons
µΩ
11. Settings
In this section various user settings can be adjusted or accessed.
11.1 General settings
Switch the rotary switch to the settings mode (Refer to 9.1 General settings on page 28).
Go to the general settings tab
. Use soft keys 1 and 4 to
choose the next tab along the top of the settings screen.
Use soft keys 2 and 3 to move up and down the items in the general settings tab.
General settings
Key Press Beep Can be set on or off.
Results Beep Can be set on or off.
Background Colour Toggle between yellow and white using the tick button.
Backlight Timer Use soft keys 2 and 3 to select from off up to 60 seconds (default is 20 seconds).
Battery Technology Toggle between NiMH and alkaline using the tick button.
Difference Meter Toggle ON and OFF using the tick button.
Lower Test Limit Choose μΩ, mΩ or Ω ranging from 1s to 9000s (default is 1 μΩ).
Refer to 4.2.5 Setting test limits (DLRO2X) on page 20
Upper Test Limit Choose μΩ, mΩ or Ω ranging from 1s to 9000s (default is 2000 Ω).
Refer to 4.2.5 Setting test limits (DLRO2X) on page 20
Pass Colour For colour blind users the pass colour can be changed from green to blue
Restore Factory Settings
Select using the TICK button (
) . When the prompt screen appears, press and hold
the TICK button ( ) for 3 seconds.
Calibration Not user accessible.
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11.2 Test Limit Pass Colour setting (DLRO2X)
When a test is complete the result will be shown in the Default Green colour. Some people who are colour blind may not be able to distinguish between green and red but can between blue and red.
1. The Pass Colour can be changed to Blue which is easier to read by colour blind users. Select Pass Colour on the Settings menu and press the TICK button ( ).
Settings
2. The Pass Colour will change to Blue.
3. Now, when a test is complete, the result will be shown in the Blue colour.
4. The colour of the result when a test fails will always be Red and cannot be changed.
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Settings
11.3 Date and Time settings (DLRO2X)
Go to the Date and Time settings tab .
Use soft key 2 to select required setting as listed below.
Press the TICK button (
Date and Time settings
Date
Time
Backlight Timer Set to either 0, 20 secs or 60 secs before backlight dims.
Sleep Timer Press the tick button and navigate using soft keys 2 and 3. Use the tick button to set.
) to choose which one to edit.
Set the date using the soft keys and the TICK button (
Set the date using the soft keys and the TICK button (
) to select.
) to select.
11.4 Language settings
Switch the rotary switch to the settings mode (Refer to 9.1 General settings on page 28).
Go to the language settings tab
Use soft keys 2 and 3 to highlight a language, and press the TICK button ( languages are English, French, German, Spanish, Latin American, Portugeuse, Dutch and Italian.
) to select the highlighted language. Available
.
Changing the set language changes the on screen display language and the keyboard layout.
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11.5 Instrument Information
Go to the instrument information tab .
Instrument information is read only, displaying:
Product serial number
Date of calibration
Measurement version
GUI version
11.6 Firmware update
The USB port on top of the DLRO2 range is for firmware updates.
There are two parts to a firmware update; the first part updates the user interface while the second part updates the measurement firmware. A firmware update file may include either or both of these. Connect a USB flash drive to the DLRO2 with the firmware update file in the root directory. The DLRO2 will automatically update when the instrument is turned on if a firmware update file is found on the USB flash drive.
Settings
1. Plug the USB flash drive in to the USB slot at the top of the instrument. Turn OFF. Wait 3 seconds and turn back ON.
2. The boot loader screen will be displayed when the instrument starts up.
3. Press [OK] to upgrade firmware or [TEST] to cancel.
4. The unit will progress through various stages.
5. When complete, remove the USB flash drive.
6. Restart the DLRO2 (turn off and on).
7. If a measurement firmware update is to be performed, then the measurement firmware update screen will display. At the end of the firmware update, the instrument will automatically restart.
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Maintenance
12. Maintenance
NOTE : There are no user replaceable parts within the DLRO2.
12.1 General Maintenance
 Test leads should be checked before use for damage and continuity.
 Ensure the unit is kept clean and dry after use.
 Close all covers when not in use.
12.2 Cleaning
1. Disconnect from mains power.
2. Wipe the instrument with a clean cloth dampened with either water or isopropyl alcohol (IPA).
12.3 Battery
WARNING : Always set the instrument to Off and remove test leads before batteries are removed or installed.
CAUTION : Old batteries must be disposed of in accordance with local regulations.
CAUTION : Only use approved batteries as defined below.
Replacement battery types are: 6 x IEC HR6 NiMH (rechargeable) or LR6 AA Alkaline (non rechargeable). Refer to Specifications on page 34.
Battery technology (battery type) can be selected between alkaline or NiMH. When changing between battery types always ensure the correct type is selected in the settings menu, failure to do this may result in incorrect battery level indication and may prevent charging. Refer to 9. Settings on page 28
To help maintain the health, reliability and longevity of the installed batteries:
 Ensure if using rechargeable batteries they are fully charged before use (charger supplied).
 Store batteries in a cool, dry place. Batteries can be damaged when exposed to heat.
12.3.1 Battery status
WARNING : Do not recharge Alkaline batteries.
The battery condition icon is positioned at the top right hand corner of display. This icon is displayed at all times when the DLRO2 is switched on. When running the icon will indicate state of charge, the icon will be filled in proportion to the state of charge.
When the battery is in a good state of charge the battery icon will be white and in a low state of charge the battery icon will flash.
When the battery is very low a large red battery icon will appear in the primary field with the message ‘Battery low please charge or replace to continue’. No tests will be able to be performed but changes to settings and data handling can be carried out. The battery must be recharged (NiMH) or replaced (Alkaline) before the DLRO2 can be used.
When the battery is charging, it will show an animation of the battery from empty to full, then repeats. Once the battery is full, the animation stops.
The maximum charging time for NiMH batteries is 6 hours, normal charging time is approximately 4 hours.
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Maintenance
12.3.2 12 V Supply
When charging NiMH rechargeable batteries, only use the power supply provided by Megger. Other power supplies will not function with the DLRO2. The Megger power supply is designed to preserve the functions and accuracy of the DLRO2.
12.3.3 Battery Charging
When charging NiMH rechargeable batteries, only use the power supply provided by Megger. Other power supplies will not function with the DLRO2. The Megger power supply is designed to preserve the functions and accuracy of the DLRO2.
WARNING : ONLY NiHM batteries are rechargeable.
When charging the DLRO2 while the instrument is OFF, an animated battery will display across the screen to show charging is taking place. Once the battery is fully charged the screen will display a solid green battery.
Battery charging Battery fully charged When charging the DLRO2 while the instrument is ON, an animated battery will display in the top right hand corner of the screen. Tests cannot be performed while the charger is connected. If the TEST button in pressed the buzzer will sound. However the Settings are fully accessible while the instrument is charging.
12.3.4 Battery error screens
Battery Low
The battery is too low to perform a test.
Charging Fault
A generic charging fault warning screen.
Turn off and disconnect the charger. Then reconnect and try
again.
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Maintenance
12.4 Battery Replacement
WARNING : Remove all test leads before removing the battery cover.
CAUTION : Batteries should not be left in the instrument if remaining unused for an extended period.
No. Description Quantity
1 Screw, captive 1
2 Cover, battery 1
1
2
4
3 Battery isolation tab 1
4 Batteries 6
3
12.4.1 Replace batteries and remove isolation tab
The batteries are housed in the lower section of the DLRO2, behind the rotary switch. Looking at the back of the instrument, the lower (battery) cover incorporates a stand and has the replacement cell types written on it.
NOTE : If using the DLRO2 for the first time remove and discard the battery isolation tab (3).
1. Remove the test leads and ensure the DLRO2 is switched off.
2. Slacken one captive cross-point screw (1) which is centred at the top of the cover.
3. Battery cover (2) will now lift away from the top.
4. Ease out of lugs at the bottom of the cover.
5. The six batteries (4) can now be lifted out of the compartment.
CAUTION : Ensure the new cells are replaced in the correct polarity as indicated on the cells and battery compartment.
CAUTION : Ensure all batteries are of the same type, do not mix NiMH or Alkaline.
1. Replace all six batteries (4).
2. Replace the battery cover (2) in reverse order to above.
3. Re-secure with screw (1).
4. If the type of batteries has changed (NiMH or Alkaline) ensure the battery technology setting is changed. Refer to 11. Settings on page 40.
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12.5 Restore Factory Settings
The unit can be reset back to factory settings to remove any personalised settings that have been created.
WARNING : Resetting the device will DELETE all stored results. Back up all results to USB stick and remove the USB stick before continuing to reset the unit.
1. Hold the TICK button ( ) for 3 seconds to
confirm that you want to restore to factory settings.
Maintenance
2. Confirm that you wish to delete all the saved results on the unit by pressing soft key 4.
3. The unit will restart
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Specifications
13. Specifications
Specification Detail
PHYSICAL
Dimensions: 228 x 105 x 75 mm (8.98 x 4.1 x 2.95 in)
Display: Full LCD colour screen with user configurable backlight.
Weight: 905 grams (with batteries)
SAFETY AND ELECTRICAL PROTECTION
Safety rating CATIII 600 V / CATIV 300 V to EN 61010, IEC 61010-031 : 2015, IEC
61010-030 Safety category rating valid to altitude of 3000 m
Live voltage Active live voltage protection to 600 V between any test terminals without
blowing a fuse. Live voltage warning on display and audible when >5 V is applied between any test terminals. Fuse protected to 1000 V, fuses are not user changeable.
LOW RESISTANCE MEASUREMENT
Resistance measurement test modes:
Overall resistance range: 1 μΩ – 2000 Ω
Max resistance across C terminals: 2 A with up to 1.1 Ω total resistance and 1 A with up to 3.2 Ω total
Basic accuracy: Bi-directional test current mode: + /- 1% +/- 2 digits
Resistance measurement ranges:
Normal test mode, Fast mΩ/long test lead mode and Inductive test mode (Resistance of inductive loads)
resistance
Uni-directional test current mode: + /- 1% +/- 10 digits Inductive mode or unidirectional mode will introduce an undefined error if an external EMF is present
Full Scale Resistance
15000 μΩ 2.00 A 1 μΩ
120.00 mΩ 2.00 A 0.01 mΩ
1000.0 mΩ 2.00 A 0.1 mΩ
30.000 mΩ 1.00 A 0.001 mΩ
220.00 mΩ 1.00 A 0.01 mΩ
2000.0 mΩ 1.00 A 0.1 mΩ
300.00 mΩ 100 mA 0.01 mΩ
2500.0 mΩ 100 mA 0.1 mΩ
20.000 Ω 100 mA 0.001 Ω
3000.0 mΩ 10.0 mA 0.1 mΩ
24.000 Ω 10.0 mA 0.001 Ω
200.00 Ω 10.0 mA 0.01 Ω
30.000 Ω 1.00 mA 0.001 Ω
240.00 Ω 1.00 mA 0.01 Ω
2000.0 Ω 1.00 mA 0.1 Ω
TEST CURRENT OUTPUT
Normal resistance test mode
Current ranges: 2 A, 1 A, 100 mA, 10 mA and 1 mA
Maximum compliance output voltage:
Test Current Resolution Normal
Resistance Mode
3.24 V (1 A mode) 2.2 V (2 A mode)
Inductive Mode
Long Test Lead Mode (1 A only)
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Specifications
Specification Detail
Current output accuracy: Normal and Inductive mode: ±10 %, Long test lead mode: +10 % -0%
At all battery conditions except with low battery indication
Thermal EMF / Seebeck effect
Yes, average of forward and reverse test current measurements
compensation:
ENVIRONMENT
Noise immunity: Less than 1% ±20 digits additional error with 80 mV peak 50/60 Hz with
on screen noise indicator. Less than 1% ±20 digits additional error with 80 mV peak 400 Hz with
on screen noise indicator. Noise rejection mode (DLRO2X) = 60 mV peak random noise.
EMC: IEC61326-1, industrial specification IEC61326-2-2
Dust and moisture ingress: IP54 to IEC60529 in use
Altitude: Operational to 3000 m
Temperature: Operational range 0 ºC to 50 ºC, Storage range -20 ºC to 50 ºC
Humidity: Operational to 95 % Storage to 90 %
DATA STORAGE:
Total maximum test measurement
8 million
records:
Maximum Asset ID references: 256
Maximum test measurement
256
records per asset, per day:
Note: continuous tests will contain multiple test measurements
POWER SUPPLY
Rechargeable 6 x HR6 Ni MH batteries with in unit fast charge (also ability to use non-rechargeable Alkaline AA batteries (LR6))
Battery charge time: < 4 hours
Battery life: >1000 bi-directional tests at 2 A into a 1 Ω load
BATTERY CHARGER ADAPTOR:
Mains / line input voltage: 100-240 V
Mains / line input frequency: 47-63 Hz
Output: 12 V DC 1.2 A 14.4 W max.
Type: Travel adaptor / interchangeable plug adaptor
Plug types: Australia, USA, Europe and UK plugs
CONNECTIONS
Test terminals: 4 X 4 mm shrouded sockets
Data: USB (For firmware updates and data transfer (DLRO2X only))
User may update instrument firmware to latest version themselves
Battery charger: 2.5 mm DC jack connector
LANGUAGES
User Interface: English, French, German, Spanish, Latin American, Portugeuse,
Dutch and Italian
User guide: English, French, German and Spanish
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Accessories and Equipment
14. Accessories and Equipment
14.1 Included Accessories
Item Order No.
DLRO2, Ducter Low Resistance Ohmmeter 2 A
DLRO2X part number is
Test leads:
Kelvin clip lead set, CAT III 600 and CAT IV 300
Kelvin probe lead set CAT III 600 and CAT IV 300
Accessories:
240 V charger power supply
Batteries: Six 1.2 V NiMH AA 2000mAHR
USB memory stick (with user guide)
Hanging hook and strap
Soft pouch
14.2 Optional Accessories
Item Order No.
Test leads:
Set of 4 Kelvin probe pins. Replacement probe tips.
4 right angled adaptors to allow hook terminated (E.g. KC100) leads to fit DLRO2
10 A Fused test probe and clip lead set
DLRO2 current and potential leadset 2m. 2 x red lead, 2 x blk lead, 2 x grabber clip, 2 x probe
KC50C-KIT Kelvin clamp/probe reel (50 m)
KC100C-KIT Kelvin clamp/probe reel (100 m)
KC50E Extension reel (50 m)
Full calibration certificate DLRO2
UKAS calibration certificate DLRO2
Full calibration certificate DLRO2X
UKAS calibration certificate DLRO2X
1012-280
1013-795
1011-928
1011-929
1002-736
1002-735
1012-068
1012-063
1012-064
1012-511
1013-224
1011-673
1013-211
1013-212
1013-213
1013-170
1013-169
1014-436
1014-437
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Accessories and Equipment
14.3 Download PowerDB
You can now download direct from the Megger website to ensure that you have the most recent version available. Visit megger.com/powerdb
The latest edition will be at the top. Click the “download” button beside the file.
This will ask if you want to open or save the file. By clicking “Save” you will begin to download the installation package, then just follow the onscreen instructions to complete installation.
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Calibration, Repair and Warranty
15. Calibration, Repair and Warranty
Megger operate fully traceable calibration and repair facilities to make sure your instrument continues to provide the high standard of performance and workmanship that is expected. These facilities are complemented by a worldwide network of approved repair and calibration companies, which offer excellent in-service care for your Megger products.
15.1 Returns procedure
WARNING : Remove the battery cells before shipping this instrument.
UK and USA Service Centres
1. When an instrument requires recalibration, or in the event of a repair being necessary, a Returns Authorisation (RA) number must first be obtained from one of the addresses shown above. The following information is to be
provided to enable the Service Department to prepare in advance for receipt of your instrument and to provide the best possible service to you:
Model (for example, DLRO2).
Serial number (found on the display under settings, device information, or on the rear cover and by the
batteries or on the calibration certificate).
Reason for return (for example, calibration required, or repair).
Details of the fault if the instrument is to be repaired.
2. Make a note of the RA number. A returns label can be emailed or faxed to you if required.
3. Pack the instrument carefully to prevent damage in transit.
4. Before the instrument is sent to Megger, freight paid, make sure that the returns label is attached or that the RA
number is clearly marked on the outside of the package and on any correspondence. For items being returned outside of the UK and USA please send copies of the original purchase invoice and packing simultaneously by airmail to expedite clearance through customs. In the case of instruments which require repair outside the warranty period, an immediate quotation can be provided when obtaining the RA number.
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Decommissioning
16. Decommissioning
16.1 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.
16.2 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.
The battery, is located under the battery cover on the back of the instrument. To remove the battery follow the instructions in Refer to 12.4 Battery Replacement on page 46.
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).
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This instrument is manufactured in the United Kingdom.
The company reserves the right to change the specification or design without prior notice.
Megger is a registered trademark
®
The Bluetooth
word mark and logos are registered trademarks owned by Bluetooth SIG,
Inc and is used under licence.
DLRO2-DLRO2X-UG_EN_V01 04 2022
© Megger Limited 2022
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