DLRO10HD and DLRO10HDX
10 A Digital Low Resistance Ohmmeter
User Guide
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DLRO10HD / DLRO10HDX
Contents
Instrument Safety 1
Measurement Connection ...............................................................................................................................2
Voltage .........................................................................................................................................................2
CAT IV ..........................................................................................................................................................2
CAT III ...........................................................................................................................................................2
CAT II ...........................................................................................................................................................2
Safety and Hazard Icons ..................................................................................................................................2
Warning Icons ..................................................................................................................................................3
Description 4
Key Features ....................................................................................................................................................4
Applications 5
Overview 6
Display .............................................................................................................................................................6
Display Icons ....................................................................................................................................................7
Secondary Display ..........................................................................................................................................7
Test Mode Rotary Switch .................................................................................................................................8
Range Rotary Switch ........................................................................................................................................9
Resolution and Accuracy ..............................................................................................................................10
Test Leads 11
Connection to the Instrument ........................................................................................................................11
Connection to a Test Piece .............................................................................................................................11
DH4-C Duplex Hand-spikes ...........................................................................................................................12
Tests with the DH4-C Duplex Hand-spikes or Individual Leads ........................................................................12
Date and Time Setup 13
Set Date and Time .........................................................................................................................................13
Tests 14
Test Lead Connection .....................................................................................................................................14
Manual Bi-directional Test ..............................................................................................................................15
Automatic Bi-directional Test (Automatic Save) ..............................................................................................16
Automatic Bi-directional Test (Manual Save) ...................................................................................................17
Automatic Uni-directional Test (Automatic Save) ...........................................................................................18
Automatic Uni-directional Test (Manual Save) ................................................................................................19
Continuous Test (Automatic Save) .................................................................................................................20
Continuous Test (Manual Save During Test) ....................................................................................................21
Continuous Test (Manual Save After Test) ......................................................................................................22
Inductive Test ................................................................................................................................................23
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DLRO10HD / DLRO10HDX
Memory Features 24
Recall Test Result Records ..............................................................................................................................24
Download Test Result Records ........................................................................................................................25
Delete Test Result Records ..............................................................................................................................26
Maintenance 27
Routine Inspection ........................................................................................................................................27
Cleaning ........................................................................................................................................................27
Care of the Instrument ..................................................................................................................................27
Test Leads .....................................................................................................................................................27
Mains Power Fuse ..........................................................................................................................................27
Battery Care ..................................................................................................................................................27
Specifications 28
Power Lead ...................................................................................................................................................29
Power Lead Connection Table .....................................................................................................................29
Battery Charge .............................................................................................................................................29
Accessories 30
Accessories (Included) ..................................................................................................................................30
Accessories (Extra Cost) ...............................................................................................................................30
Test Leads (Extra Cost) .................................................................................................................................31
Test Leads with an In-line Connector ............................................................................................................31
Repair and Warranty 32
Calibration, Service and Spare Parts ..............................................................................................................32
Approved Repair Companies .........................................................................................................................32
Return an Instrument for Repair ....................................................................................................................32
End of Life Disposal 33
WEEE Directive ..............................................................................................................................................33
Batteries .....................................................................................................................................................33
Deceleration of Conformity 34
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DLRO10HD / DLRO10HDX
Instrument Safety
Instrument Safety
If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment
may be impaired
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 have no broken or cracked insulation
If the test subject to which the instrument is connected is energised while the instrument is turned off,
protection devices may not prevent the instrument from overheating. In which case, parts of the case may
become very hot and damage may occur
• Set the instrument to ON before connecting to the test subject
• The test subject must be set to OFF, de-energised and checked before test connections are made. Make
sure 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 any 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
• 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
There are no user-serviceable parts inside the instrument; all servicing, including battery and fuse
replacement, must be referred a Megger approved service centre
When used on hazardous voltages the Megger terminal cover (part number 1002-390) must be used
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DLRO10HD / DLRO10HDX
Instrument Safety
This product is not intrinsically safe. Do not use in an explosive atmosphere
Measurement Connection
Only Megger supplied test leads designed for this instrument provide the full safety rating.
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 Power 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.
Safety and Hazard Icons
This section details the various safety and hazard icons on the instruments outer case.
Icon Description
Warning: High Voltage, risk of electric shock
F
Caution: refer to User Guide
G
Equipment protected throughout by Double Insulation.
t
Equipment complies with current EU directives.
Equipment complies with current “C tick” requirements.
Do not dispose of in the normal Waste stream.
Fuse
f
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DLRO10HD / DLRO10HDX
Warning Icons
This section details the warning icons that can show on the display.
Icon Warning Description
External Voltage Warning If an external voltage is applied between the terminals and the
F
F
Discharge Voltage/Current
Warning
instrument is set to On, the High Voltage warning will flash on the
display. This is a warning that the item under test is live and might be
dangerous and testing is disabled. The High Voltage warning message
will flash if more than 50 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 high voltage.
Note: The warning will not operate if the instrument is set to Off.
The High Voltage warning and the red High Voltage LED on the panel
will flash if a current greater than 1 mA is still flowing after an inductive
test is completed. This suggests that the inductive load has been
tested and is discharging. Do not disconnect the current loop while the
discharge warning is showing.
Instrument Safety
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DLRO10HD / DLRO10HDX
Description
Description
This User Guide details the DLRO10HD and the DLRO10HDX.
Both the DLRO10HD and the DLRO10HDX measure the same tests and parameters, in addition the DLRO10HDX
can save, recall and download test results to PowerDB.
The DLRO10 range of digital low resistance ohm meters measure resistance in a range of 0.1 µΩ to 2 k. These
instruments provide a maximum test current of 10 Amps. The DLRO10 range consist of four versions:
DLRO10
DLRO10X
DLRO10HD
DLRO10HDX
Key Features
Simple operation
High power ranges
Simultaneous testing and battery charging
Rugged case construction designed for use in demanding environments or the lab
IP65 with the lid closed and IP54 with the lid open for protection against ingress during operation (IP65 lid
closed)
Multiple lead set options (Megger connect leads - see the lead set data-sheet)
10 A while measuring up to 250 mΩ and 1 A while measuring up to 2.5 Ω
Monitors test lead contact - reduces the chance of erroneous readings
Rechargeable battery: Capacity <1000 10A test
Auto power off
Large, clear LCD for all light conditions
Time and Date stamped memory for recording of results (DLRO10HDX only)
Memory storage and USB download capability (DLRO10HDX only)
CAT III 300 V: Protected against accidental connection to external voltages up to 600 V DC applied between
any pair of the f our terminals for up to 10 seconds
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DLRO10HD / DLRO10HDX
Applications
Applications
The DLRO10HD and DLRO10HDX measure 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.
The DLRO10HD is well suited to measuring thick conductors, bonds and quality of welding because of its 10 A
range for resistance values up to 250 mΩ. 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.
When dissimilar metals are joined a thermocouple effect is created. Users should select a bidirectional mode to
ensure cancellation of this effect. The instrument measures with current flowing in both directions and averages
the result. Typical applications of the DLRO10HD include DC resistance measurements of:
When dissimilar metals are joined a thermocouple effect is created. Users should select a Bi-directional mode to
make sure this effect is cancelled. The instrument measures with current flowing in both directions and averages
the result.
Typical applications include DC resistance measurements of:
Switch and contact breaker resistance
Transformer and motor winding resistance
Busbar and cable joints
Rail and pipe bonds
Aircraft frame bonds and static control circuits
Metal alloys, welds and fuse resistance
Integrity of welded joints
Graphite electrodes and other composites
Inter-cell connections on battery systems up to ¦
Wire and cable resistance
300 V peak
Transmitter aerial and lightning conductor bonding
Quality control of resistive components
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DLRO10HD / DLRO10HDX
Overview
Overview
This section details an over view of the instrument:
Display
DLRO10HDX
DLRO10HD
16
15
14
13
12
15
1 2
1011
1 2
3
4
5
6
7
89
3
4
13
12
14
9811
7
16
Item Description Item Description
1 Current Terminals 9 Test button (Start and stop tests)
2 Potential Terminals 10 Navigation keypad (setup and stored results)
3 Test Lead LED Cable 11 Test modes and Off rotary switch
4 Display 12 Mains Power On LED
5 Save Button 13 Fuse
6 USB socket (download records) 14 Contrast button
7 Hazard warning LED during test 15 Mains Power Socket
8 Range Rotary Switch 16 Back-light
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DLRO10HD / DLRO10HDX
Display Icons
Overview
DLRO10HDX
DLRO10HD
15
14
13
14
13
71 2 3 4 5 6 8
12
15 7 8
9
10
11
8
9
1112
Item Description Item Description
1 Delete 9 Noise (over 100 mV 50/60 Hz)
2 Test Result Download mode 10 Over Temperature
3 Recall Test Result Mode 11 Refer to User Guide
4 Date and Time mode 12 High Voltage Warning
5 Save mode 13 Secondary Displays
6 USB connected 14 Primary Display
7 Mains Power connected 15 Direction of Current flow in a test
8 Battery Status
Secondary Display
Directional arrow to show current flow above C indicator
Directional arrow to show current flow above P indicator
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DLRO10HD / DLRO10HDX
Overview
Test Mode Rotary Switch
Test modes and instrument Off are selected with the Test Mode rotary switch.
3 4
2 5
1 6
AUTO
3s
Available test modes are:
Item Mode Description
1 Off Instrument is Off. Rotate the switch to any mode to start the instrument
2 Manual Bi-directional Test current applied in both directions current flow. Continuity of all four
connections is checked. Current is applied in both forward and reverse
direction.
See “Manual Bi-directional Test” on page 15
3 Automatic Bi-directional Test current applied in both directions current flow.
See “Automatic Bi-directional Test (Automatic Save)” on page 16
See “Automatic Bi-directional Test (Manual Save)” on page 17
4 Automatic Uni-directional Current is applied in one direction only, to speed up the measurement
process. Standing EMF’s setup during the test are ignored so lower
accuracy can result.
See “Automatic Uni-directional Test (Automatic Save)” on page 18
See “Automatic Uni-directional Test (Manual Save)” on page 19
5 Continuous Test current is applied in both directions. The test repeats at three seconds
intervals.
See “Continuous Test (Automatic Save)” on page 20
See “Continuous Test (Manual Save During Test)” on page 21
See “Continuous Test (Manual Save After Test)” on page 22
6 Inductive Test current applied in only one direction.
See “Inductive Test” on page 23
G 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.
Note: When inductive loads are measured it is necessary to wait for the voltage to stabilise, so the measurement
process can take a few seconds or several minutes.
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DLRO10HD / DLRO10HDX
Range Rotary Switch
The instruments test range of resistance and current is selected with the Range rotary switch.
DLRO10HDX DLRO10HD
1mA
µA
100
250
Ω
1
2.5
kΩ
5
4
3
Green resistance ranges: Low output power (<0.25 W) outputs.
Red resistance ranges: Higher 2.5 W (1 A) and 25 W (10 A) power outputs (Warning icon shows).
10mA
25
Ω
100
2.5
mA
Ω
250
mΩ
250
mΩ
25
mΩ
2.5
Ω
2.5
mΩ
10A
1A
10A
1A
2
2
Overview
Item Mode Description
1 Date and Time Set the date and time (see “Date and Time Setup” on page 13
2 Resistance and Current
Range
Set the test range and current (see “Resolution and Accuracy” on page
10)
3 Delete Records Delete a single or all test result records (DLRO10HDX only (see”Memory
Features” on page 24))
4 Download Records Download test result records to PowerDB (DLRO10HDX only (see”Memory
Features” on page 24))
5 Recall Records Recall and view previous test result records (DLRO10HDX only (see”Memory
Features” on page 24))
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DLRO10HD / DLRO10HDX
Overview
Resolution and Accuracy
Test current accuracy ±10%
Voltmeter input impedance >200 kΩ
Maximum lead resistance at 10 A <100 mΩ
Test Current Resistance Range Resolution
(as shown)
100 µA 0 to 2.5 kΩ 0.1 Ω ±0.2% ±200 mΩ 25 mV 25 µW
100 µA 0 to 250 Ω 0.01 Ω ±0.2% ±20 mΩ 25 mV 2.5 µW
1 mA 0 to 25 Ω 1 mΩ ±0.2% ±2 mΩ 25 mV 25 µW
10 mA 0 to 2.5 Ω 0.1 mΩ ±0.2% ±200 µΩ 25mV 250 µW
100 mA 0 to 250 mΩ 0.01 mΩ ±0.2% ±20 µΩ 25 mV 2.5 mW
1 A 0 to 25 mΩ 1 µΩ ±0.2% ±2 µΩ 25 mV 25 mW
10 A 0 to 2.5 mΩ 0.1 µΩ ±0.2% ±0.2 µΩ 25 mV 0.25 W
1 A** 0 to 2.5 Ω 0.1 mΩ ±0.2% ±200 µΩ 2.5 V 2.5 W
10 A** 0 to 250 mΩ 0.01 mΩ ±0.2% ±50 µΩ 2.5 V 25 W
* Basic accuracy stated assumes forward and reverse measurements.
** Warning icon shows
Inductive or Uni-directional mode can introduce an undefined error if an external EMF is present.
Basic accuracy at reference conditions.
Basic Accuracy* Full Scale
Voltage
Max. Power
Output
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DLRO10HD / DLRO10HDX
Test Leads
The test leads can be used with either:
Hand-spikes (supplied), or
Clamps (optional accessory)
See “Accessories” on page 30
Connection to the Instrument
Connect the supplied test leads to the instrument as show below:
DLRO
DIGITAL LOW RESISTANCE OHMMETER
Test Leads
Tip: To help connect the test leads remove the instrument lid. Open the lid to approximately 45º and slide it to the
right.
Connection to a Test Piece
Connect the test leads to the test piece in the Kelvin arrangement as shown:
P
G
<30V AC WITHOUT
TERMINAL COVER
CAT RATED WHEN
USED WITH MEGGER
TERMINAL COVER
The image shows the correct test lead connection of the current (C1, C2) and potential probes (P1, P2) to a test
piece. To make sure test readings are accurate, the current terminals (C1 and C2) must be connected outside of
the potential terminals (P1 and P2).
The earth terminal is used to detect floating voltage on the test subject relative to the Instrument’s 0 V. High
floating voltage on the test subject could be a hazard to the User and the Instrument.
If the test subject is ±200 mV from the Instrument 0 V, the test will be inhibited.
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DLRO10HD / DLRO10HDX
Test Leads
DH4-C Duplex Hand-spikes
Each hand-spike is marked with the letter P (potential terminals). These should always be the inside contacts
when a test measurement is taken.
One of the test lead connectors has two LEDs (L1 and L2) and an LED driver cable. The LED driver cable plugs into
the terminal next to terminal P2 (see “Connection to the Instrument” on page 11).
LEDs L1 and L2, give information to the User that would otherwise only be available on the display:
Lamp L1 Lamp L2 Description
On (red) Off Inadequate continuity at C or P contacts
Flashing (red) Off Voltage present between contacts
Off On (green) Current , 1mA, test complete
Off On (red) Measurement fail
For example, when the test leads are used in an Auto test mode:
1. Press
2. L1 shows a steady red to show there is a contact failure.
3. When all four contacts are connected, L1 goes Off.
4. No LEDs show in a test, unless contact fails.
5. To signal end of test, L2 shows a steady green when the current flow has decayed to less than 1 mA.
6. When the test leads are removed from the test piece, L2 goes Off (end of test) and L1 shows red (no contact).
When the DH4-C Duplex Hand-spikes are used, the instrument always makes sure that there is a good contact
before the full test current is applied, so there should be no erosion of the contact tips. However, if the tips
become worn or blunted, they can be replaced. Pull out the worn tips and install new ones.
TEST
.
Tests with the DH4-C Duplex Hand-spikes or Individual Leads
Connect the four leads as shown. In all cases make sure that the potential probes (P1 and P2) are inside the
current (C1 and C2) probes.
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DLRO10HD / DLRO10HDX
Date and Time Setup
AUTO
3s
(DLRO10HDX only)
1mA
µA
100
250
Ω
2.5
kΩ
Set Date and Time
Press to toggle between D:M:Y or M:D:Y format
(Default: DMY).
OK
Press
to toggle between Date and Time
10mA
25
2.5
Ω
Ω
250
mΩ
250
mΩ
100
mA
25
mΩ
2.5
mΩ
2.5
Ω
10A
Date and Time Setup
1A
10A
1A
1. Press to start adjustment.
2. Press
3. Press
4. Press
5. Press
to toggle between D/M/Y and HM
to adjust
to scroll
OK
to set
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DLRO10HD / DLRO10HDX
Tests
Tests
This section details the instruments test procedures.
Test Lead Connection
A good test measurement requires both the Current carrying circuit and the Voltage detection circuit to be
completed by the unit under test. The Instrument checks for continuity in both C and P circuits.
A test will not start until there is a good connection to the test piece by the test leads.
Confirmation of successful continuity:
If C 1----2 and P 1----2 are constant the connectivity is good.
If either C 1----2 and P 1----2 flash there is no connectivity, and the test will not start.
Successful Connection Unsuccessful connection
The resistance result is shown on the display in either Ω, mΩ or µΩ ranging from 2500.0 Ω to 0.1 µΩ.
The result in Bi-directional modes is the average of two readings shown by the two secondary displays, with
arrows to show the direction of current flow. The large arrow at the top of the display between C1 and C2 shows
the measurement current flow.
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DLRO10HD / DLRO10HDX
Manual Bi-directional Test
AUTO
3s
1mA
µA
100
250
Ω
2.5
kΩ
Tip: Use Clamp test leads (optional accessory)
Note: In Manual test mode both the Current and Voltage test leads must be connected across the test piece
TEST
before
is pressed.
10mA
25
Ω
100
2.5
mA
Ω
250
mΩ
1A
25
mΩ
2.5
10A
mΩ
2.5
Ω
1A
250
mΩ
10A
Tests
1. Press
TEST
(acknowledged by a beep sound).
Test starts (LED shows red).
Arrow direction animated (based on current direction)
and plateau.
Test result for the currently connected test piece is
shown.
2. Save test results (if required).
TEST
Press
. The test result is saved and the memory slot
number is shown.
The Save screen is shown for three seconds.
TEST
3. If the test piece is still connected, press
to do
another test.
4. Remove the clamps and press
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TEST
to stop the test.
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DLRO10HD / DLRO10HDX
Tests
AUTO
3s
Automatic Bi-directional Test (Automatic Save)
1mA
µA
100
250
Ω
2.5
kΩ
1. Press (acknowledged by a beep sound).
Save function is available until the memory has 200 test
records.
2. Connect the test leads to the test piece.
Test starts (LED shows red).
Arrow direction animated (based on current direction)
and plateau.
10mA
25
2.5
Ω
Ω
250
mΩ
250
mΩ
100
mA
25
mΩ
2.5
Ω
2.5
mΩ
10A
1A
10A
1A
3. Test results for the currently connected test piece are
shown.
Test results are saved and their memory slot number is
shown. The Save screen is shown for three seconds.
4. The test automatically continues for the next connected
test piece.
5. Press
TEST
to stop the test.
TEST
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DLRO10HD / DLRO10HDX
Automatic Bi-directional Test (Manual Save)
AUTO
3s
1mA
µA
100
250
Ω
2.5
kΩ
1. Connect the test leads to the test piece.
Test starts (LED shows red).
Arrow direction animated (based on current direction)
and plateau.
10mA
25
Ω
100
2.5
mA
Ω
250
mΩ
1A
25
mΩ
2.5
mΩ
2.5
Ω
1A
250
mΩ
10A
Tests
10A
TEST
2. Test results for the currently connected test piece are
shown.
3. Save test results (if required).
Press
. The test result is saved and its memory slot
number is shown. The Save screen is shown for three
seconds.
4. The test automatically continues for subsequent
connected test piece.
5. Press
6. Press
as required.
TEST
to stop the test.
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DLRO10HD / DLRO10HDX
Tests
AUTO
3s
Automatic Uni-directional Test (Automatic Save)
1mA
µA
100
250
Ω
2.5
kΩ
1. Press (acknowledged by a beep sound).
Save is available until the memory has 200 test records.
2. Connect the test leads to the test piece.
Test starts (LED shows red).
Arrow direction animated (based on current direction)
and plateau.
10mA
25
Ω
100
2.5
mA
Ω
250
mΩ
25
mΩ
2.5
mΩ
2.5
Ω
250
mΩ
10A
1A
10A
1A
3. Test results for the currently connected test piece are
shown.
4. Test results are saved and their memory slot number is
shown. The Save screen is shown for three seconds.
5. The test automatically continues for the next connected
test piece.
6. Press
TEST
to stop the test.
TEST
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DLRO10HD / DLRO10HDX
Automatic Uni-directional Test (Manual Save)
AUTO
3s
1mA
µA
100
250
Ω
2.5
kΩ
1. Connect the test leads to the test piece.
Test starts (LED shows red).
Arrow direction animated (based on current direction)
and plateau.
10mA
25
Ω
100
2.5
mA
Ω
250
mΩ
1A
25
mΩ
2.5
10A
mΩ
2.5
Ω
1A
250
mΩ
10A
Tests
TEST
2. Test results for the currently connected test piece are
shown.
3. Save test results (if required).
Press
. The test result is saved and its memory slot
number is shown.
The Save screen is shown for three seconds.
4. The test automatically continues for subsequent
connected test piece.
5. Press
6. Press
as required.
TEST
to stop the test.
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DLRO10HD / DLRO10HDX
Tests
AUTO
3s
Continuous Test (Automatic Save)
Tip: Use Clamp test leads (optional accessory)
µA
100
1mA
10mA
25
250
Ω
Ω
2.5
kΩ
100
2.5
mA
Ω
250
mΩ
1A
25
mΩ
2.5
10A
mΩ
2.5
Ω
1A
250
mΩ
10A
1. Press
(acknowledged by a beep sound).
Save is available until the memory has 200 test records.
2. Press
TEST
. Test starts (LED shows red).
3. Arrow direction animated (based on current direction)
and plateau.
4. Continuous measurements are taken on the connected
test piece.
Tests are made every three seconds.
Last test record is shown while the next test is in progress.
5. Press
TEST
to stop the test.
Test results are saved and their memory slot number is
shown. The Save screen is shown for three seconds.
TEST
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DLRO10HD / DLRO10HDX
Continuous Test (Manual Save During Test)
AUTO
3s
1mA
µA
100
250
Ω
2.5
kΩ
Tip: Use Clamp test leads (optional accessory)
10mA
25
Ω
100
2.5
mA
Ω
250
mΩ
25
mΩ
2.5
mΩ
2.5
Ω
250
mΩ
10A
Tests
1A
10A
1A
1. Press
TEST
.
Test starts (LED shows red).
2. Arrow direction animated (based on current direction)
and plateau.
3. Continuous measurements are taken on the connected
test piece.
Tests are made every three seconds.
Last test record is shown while the next test is in
progress.
4. Save test results (if required).
At any point press
(acknowledged by a beep
sound).
Test results are saved until the test is stopped or the
memory is full (2000 records).
TEST
5. Press
to stop the test.
6. Test results are saved and the memory slot number is
shown. The Save screen is shown for three seconds.
TEST
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DLRO10HD / DLRO10HDX
Tests
AUTO
3s
Continuous Test (Manual Save After Test)
µA
100
Tip: Use Clamp test leads (optional accessory)
1mA
250
Ω
2.5
kΩ
10mA
25
Ω
100
2.5
mA
Ω
250
mΩ
1A
25
mΩ
2.5
10A
mΩ
2.5
Ω
1A
250
mΩ
10A
1. Press
TEST
.
Test starts (LED shows red).
Arrow direction animated (based on current direction)
and plateau.
2. Continuous measurements are taken on the connected
test piece.
Tests are made every three seconds.
Last test record is shown while the next test is in
progress.
3. Press
TEST
to stop the test.
The last complete test result is shown.
TEST
TEST
4. Save test results if required.
Press
. The last complete test result is saved and its
memory slot number is shown.
The Save screen is shown for three seconds.
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DLRO10HD / DLRO10HDX
Inductive Test
AUTO
3s
µA
100
250
Ω
2.5
kΩ
Tip: Use Clamp test leads (optional accessory)
1mA
Tests
10mA
25
Ω
100
2.5
mA
Ω
250
mΩ
1A
25
mΩ
2.5
10A
mΩ
2.5
Ω
1A
250
mΩ
10A
1. Press
TEST
.
Test starts (LED shows red).
Arrow direction animated (based on current direction)
and plateau.
2. Continuous measurements are taken on the connected
test piece.
The last three test records show (new test result shows on
the Primary display (rolling display)).
Last test record is shown while the next test is in
progress.
3. Press
TEST
to stop the test.
The last complete three test results are shown.
4. Save test results if required.
TEST
TEST
Press
. The last complete test result is saved and its
memory slot number is shown.
The Save screen is shown for three seconds.
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DLRO10HD / DLRO10HDX
Memory Features
AUTO
3s
Memory Features
(DLRO10HDX only)
The DLRO10HDX can record, saved and download test results.
Up to 200 memory slots are available.
Recall Test Result Records
1mA
10mA
25
2.5
Ω
Ω
1. Last saved test result shows.
µA
100
250
Ω
2.5
kΩ
250
mΩ
250
mΩ
100
mA
25
mΩ
2.5
Ω
2.5
mΩ
10A
1A
10A
1A
2. Press
3. Press
to scroll through the test results records.
OK
to show a record for the selected slot.
Screen toggles between date and time when record was
saved.
Note: While in Memory Recall mode, if no records are found, the warning icon shows on the display.
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DLRO10HD / DLRO10HDX
Download Test Result Records
AUTO
3s
1mA
µA
100
250
Ω
2.5
kΩ
1. Open PowerDB.
2. Click on the required Instrument.
3. In the Instrument configuration window, make sure
the comms parameters are correct.
4. Click OK. The Microhmmeter Measurements form opens.
5. Click Download DLRO10HDX Data.
The USB icon (on the Instrument) shows only while the
data download in progress. If communication to the
host PC fails a Communication Error window shows in
PowerDB
10mA
25
Ω
100
2.5
mA
Ω
250
mΩ
1A
25
mΩ
2.5
mΩ
2.5
Ω
1A
250
mΩ
10A
Memory Features
10A
Tip: If download does not start: Click Initialise, wait for
OK to show, then click Download DLRO10HDX
Data again.
6. In PowerDB select the required test results (Shift+Click).
7. Click OK to import the selected test results into the
Microhmmeter Measurements form.
8. In PowerDB amend the Microhmmeter Measurements
form as required (see PowerDB help)
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DLRO10HD / DLRO10HDX
Memory Features
AUTO
3s
Delete Test Result Records
All test result records or a single test result record (last recorded test result) can be deleted.
Delete icon flashes to show Memory Delete mode.
1mA
µA
100
250
Ω
2.5
kΩ
1. Press to toggle SLOt (Single delete) or ALL (Delete
All).
Single Delete: Only the last test record in the list can be
deleted, at a time.
10mA
25
Ω
100
2.5
mA
Ω
250
mΩ
1A
25
mΩ
2.5
10A
mΩ
2.5
Ω
1A
250
mΩ
10A
OK
2. Press
to confirm deletion (Delete icon shows
constant to confirm delete mode).
OK
3. Press
to delete.
Note: While in Delete Memory mode, if no records are found, the warning icon shows on the display.
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DLRO10HD / DLRO10HDX
Maintenance
Maintenance
Routine Inspection
Look for any cracks or other damage to the enclosure, missing ports, etc.
Cleaning
Disconnect the instrument from the Mains Power. Wipe it with a clean cloth slightly damped with water or
Isopropyl alcohol (IPA). Care should be taken near the terminals, the IEC Mains Power and USB sockets.
Care of the Instrument
The instrument should always be handled with care and not dropped. Always make sure that the instrument is
secured when being transported to prevent mechanical shock.
Test Leads
Leads are silicone insulated and work well in all weather conditions. Always keep the leads in a suitable lead bag
when in storage or transportation.
Regular inspection of leads is recommended to make sure that they are not damaged in any way. Damaged leads
could affect resistance readings and are a safety hazard.
Mains Power Fuse
Always use the correct rated fuse (see “Specifications” on page 28)
Battery Care
Caution: Batteries are only to be installed or removed by an Authorised Service Centre. Do not attempt
to remove the batteries from this instrument.
To prevent deep battery discharge, the battery should be charged at a minimum of three month intervals.
Never attempt to charge the battery below 0 °C or above +40 °C ambient.
The battery is charged when Mains Power is connected (unless a test is in progress).
To improve battery life, store the instrument in a cool, dry location. Storage temperatures below freezing
should be avoided.
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DLRO10HD / DLRO10HDX
Specifications
Specifications
Item Description
Temperature Coefficient < 0.01% per ºC, from 5 ºC to 40 ºC
Maximum Altitude 2000 m (6562 ft) to full safety specifications
Display Size and Type Primary five digit and two five digit secondary displays
Voltage Input Range 100 - 240 V 50 / 60 Hz 90 VA
Mains Power Input Fuse T 1.25 A, 250 V, HBC ceramic 20 mm x 5 mm
Battery Type 6 V, 7 Ah sealed lead acid (return instrument to a Megger authorised repair agent
Battery Charge Time Eight hours
Battery Life >1000 Automatic (three seconds) tests
Back-light LED
Auto Power Down 300 seconds after inactivity
Mode Selection Rotary switch
Range Selection Rotary switch
for replacement)
Memory Features Rotary switch (DLRO10HDX only)
Memory Storage 200 test result records (DLRO10HDX only)
USB Connection Download to PowerDB
Weight 6.7 kg
Case Dimensions 315mm (L) x 285mm (W) x 181mm (H)
Pouch for Test Leads Yes (lid mounted)
Test Leads Dependant on order code selected
IP Rating IP65 case closed, IP54 battery operation
Safety Rating In accordance with IEC61010-1, CATIII 300 V when used with optional terminal
cover (“Accessories (Extra Cost)” on page 30)
Application IEC 61010 defines measurement categories from I to IV relating transient over
voltages and the location within electrical installations. This instrument is designed
for use at Category III (Building installation level) on 300 V phase to earth systems,
520 V phase to phase.
Operating Temperature and
Humidity
Storage Temperature and
Humidity
Reference Conditions 20 ºC (±3 ºC)
EMC In accordance with IEC61326-1 (Heavy industrial)
Noise Rejection Less than 1% (±20) digits additional error with 100 mV peak 50/60 Hz. on the
Maximum lead resistance 100 mΩ total for 10 A operation irrespective of battery condition.
-10 °C to +50 °C (14 °F to 122 °F) <90% RH
-25 °C to +60 °C, <90%RH
potential leads.
Warning will show if hum or noise exceeds this level.
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DLRO10HD / DLRO10HDX
Specifications
Power Lead
If the power lead supplied is not suitable for your Mains Power connection, do not use an adaptor. Always use a
power lead installed with the correct plug. The instrument has a two-pin IEC60320 Mains Power socket.
Most power leads are made with three-core cable, so the ground connection will not be used.
Power Lead Connection Table
Connection K/International USA
Earth / Ground Yellow / Green Green
Neutral Blue White
Live (Line) Brown Black
If a fused plug is used, make sure that it is installed with a 3 A fuse (see “Specifications” on page 28).
The instrument can be powered from 100 - 240 V 50 / 60 Hz 90 VA.
Battery Charge
The battery charges when a Mains Power supply is connected.
For optimum battery life, charge the battery after each use. A fully discharged battery takes eight hours to
recharge.
The charge level will go from low to full charge in incremental steps and continue as long as Mains Power is
connected (unless a test is in progress). When the battery is fully charged the battery icon will stay steady.
Battery full charge
Battery charge low
Battery discharged: The instrument shuts down automatically.
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DLRO10HD / DLRO10HDX
Accessories
Accessories
Accessories (Included)
Item Order No.
Test Lead Pouch (lid mounted) 1000-036
DLRO10HD / 10HDX User Guide CD 1000-869
Warranty Book 6170-618
Accessories (Extra Cost)
Item Order No.
Calibration Shunt,10 Ω, current rating 1 mA 249000
Calibration Shunt, 1 Ω, current rating 10 mA 249001
Calibration Shunt, 100 mΩ current rating 1A 249002
Calibration Shunt, 10 mΩ current rating 10 A 249003
Certificate of Calibration for Shunts, NIST CERT-NIST CERT-NIST
Replacement tips for DH4 and DH5 hand-spikes Needle point 25940-012
Replacement tips for DH4 and DH5 hand-spikes Serrated end 25940-014
Terminal Cover (use in conjunction with DH4 test leads supplied as standard, or optional
DH5 test leads for CATIII 300 V compliance)
1002-390
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DLRO10HD / DLRO10HDX
Test Leads (Extra Cost)
Normal test leads (no in-line connector)
Item Order No.
DH5 straight duplex handspikes (x2 (One has indicator lights)) 2.5m/8ft 6111-517
Duplex Handspikes with spring loaded helical contacts (x2) 2m/7ft 242011-7
DH1 2.5m/8ft 6111-022
DH1 5.5m/18ft 242011-18
DH2 6m/20ft (only 1 lead supplied) 6111-023
DH2 9m/30ft (only 1 lead supplied) 242011-30
DH3 9m/30ft 6111-024
Straight Duplex Handspikes Heavy Duty with fixed contacts (x2) 2m/7ft 242002-7
Straight Duplex Handspikes Heavy Duty with fixed contacts (x2) 5.5m/18ft 242002-18
Straight Duplex Handspikes (2) Heavy Duty with fixed contacts (x2) 9m/30ft 242002-30
Duplex Heavy Duty 5cm (2”) C-Clamps. (x2) 2m/7ft 242004-7
Duplex Heavy Duty 5cm (2”) C-Clamps. (x2) 5.5m/18ft 242004-18
Duplex Heavy Duty 5cm (2”) C-Clamps. (x2) 9m/30ft 242004-30
Duplex handspikes with replaceable Needle Points 2m/7ft 242003-7
Duplex 1.27 cm (1/2 “) Kelvin Clips. (x2) gold plated 2m/7ft 241005-7
Duplex 1.27 cm (1/2 “) Kelvin Clips. (x2) silver plated 2m/7ft 242005-7
Duplex 3.8 cm (11/2”) Kelvin Clips. (x2) 2m/7ft 242006-7
Duplex 3.8 cm (11/2”) Kelvin Clips. (x2) 5.5m/18ft 242006-18
Duplex 3.8 cm (11/2”) Kelvin Clips. (2) 9m/30ft 242006-30
Single handspike for potential measurement (x1) 2m/7ft 242021-7
Single handspike for potential measurement (x1) 5.5m/18ft 242021-18
Single handspike for potential measurement (x1) 9m/30ft 242021-30
Current clip for current connections (x1) 2m/7ft 242041-7
Current clip for current connections (x) 5.5m/18ft 242041-18
Current clip for current connections (x1) 9m/30ft 242041-30
Accessories
Note: For more details of optional test lead-sets see the separate test lead data-sheet DLRO_TL_DS_en_V01.pdf
Test leads with In-line Connector
For detailed information on connecting lead accessories refer to the supplied “Accessory Important Information
Sheet” (DLROTestLeads--2007-431_UG_EN-DE-FR-ES-IT_V##)
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DLRO10HD / DLRO10HDX
Repair and Warranty
Repair and Warranty
If the protection of an instrument has been impaired it should not be used, but sent for repair by suitably
trained and qualified personnel. The protection is likely to be impaired if, for example, the instrument shows
visible damage, fails to perform the intended measurements, has been subjected to prolonged storage under
unfavourable conditions, or has been exposed to severe transport stresses.
New instruments are covered by a two year warranty from the date of purchase by the User, the second year
being conditional on the free registration of the product on www.megger.com. You will need to log in, or first
register and then login to register your product. The second year warranty covers faults, but not recalibration
of the instrument which is only warranted for one year. Any unauthorised prior repair or adjustment will
automatically invalidate the warranty.
These products contain no User repairable parts and if defective should be returned to your supplier in original
packaging or packed so that it is protected from damage during transit. Damage in transit is not covered by this
warranty and replacement/repair is chargeable.
Megger warrants this instrument to be free from defects in materials and workmanship, where the equipment
is used for its proper purpose. The warranty is limited to making good this instrument (which shall be returned
intact, carriage paid, and on examination shall disclose to their satisfaction to have been defective as claimed).
Any unauthorised prior repair or adjustment will invalidate the warranty. Misuse of the instrument, from
connection to excessive voltages, fitting incorrect fuses, or by other misuse is excluded from the warranty. The
instrument calibration is warranted for one year.
This Warranty does not affect your statutory rights under any applicable law in force, or your contractual rights
arising from a sale and purchase contract for the product. You may assert your rights at your sole discretion
Calibration, Service and Spare Parts
For service requirements for Megger Instruments contact Megger or your local distributor or authorised repair
centre.
Megger operates fully traceable calibration and repair facilities, to make sure your instrument continues to
provide the high standard of performance and workmanship you expect. These facilities are complemented by
a worldwide network of approved repair and calibration companies to offer excellent in-service care for your
Megger products.
See the back of this User Guide for Megger contact details.
To find your local Authorised Service Centre email Megger on ukrepairs@megger.com and give details of your
location.
Approved Repair Companies
A number of independent instrument repair companies have been approved to do repair work on most Megger
instruments, complete with genuine Megger spare parts.
Consult the Appointed Distributor / Agent about spare parts, repair facilities and advice.
Return an Instrument for Repair
If an instrument is to be returned the manufacturer for repair, it should be sent freight pre-paid to the appropriate
address. A copy of the Invoice and of the packing note should be sent simultaneously by airmail to expedite
clearance through Customs. A repair estimate, which will show freight return and other charges, will be submitted
to the sender, if required, before work on an instrument starts.
Note: The battery is a sealed Lead-acid type and if changed the disposal of old cells should be in accordance with
local regulations.
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DLRO10HD / DLRO10HDX
End of Life Disposal
End of Life Disposal
WEEE Directive
The crossed out wheeled bin icon placed on Megger products is a reminder that this instrument must not be
dispose of in general waste at the end of its life.
Megger is registered in the UK as a Producer of Electrical and Electronic Equipment (Registration No.: WEE/
HE0146QT).
For more information about the disposal of the product consult your local Megger company or distributor or visit
your local Megger website.
Batteries
Battery replacement must only be done by a Megger authorised repair agent, who will correctly dispose of the
‘end of life’ battery or batteries.
The crossed out wheeled bin placed on the batteries is a reminder that the batteries must not be dispose of with
general waste.
This instrument contains:
One sealed lead acid battery 6V, 7Ah (NP7-6 type), and
One Lithium ion coin cell battery (DLRO10HDX only)
The lead acid battery installed in this instrument is classified as a Portable Battery.
The Lithium ion coin cell battery is classified as an Industrial Battery.
Megger is registered in the UK as a producer of batteries (Registration No.: BPRN00142).
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DLRO10HD / DLRO10HDX
Deceleration of Conformity
Deceleration of Conformity
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.
The full text of Megger Instruments EU declarations of conformity are available at the following internet address:
megger.com/eu-dofc.
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