Megger DLRO100E User manual

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1OOH & 10OHB 1O0A High Performance
Digital Low Resistance Ohmmeter
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User guide

Contents
Safety warnings
Safety and hazard symbols used on the instrument
General description
lnstrument controls and indicators
Preparations for use
Operatin g instructions
Lead connections
'l - Testing modes
2 - lnstrument set-up
2 - DLRO100A Resetting Battery Charge
3 - Saving a test record
4 - Delete results
5 - Download a test record
5 - Remote operation
7 - Asset tagging
8 - Screen symbol reference
Battery indicator
Error lndicator
Preventive mai ntenance
Techn ical specif ication
Download PowerDB
Accessories
Acknowledgements
Repair and warranty
Calibration, service and spare parts
Approved service centres
3
4
5
5
7
8
9
10
12
16
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18
19
20
21
22
23
24
25
26
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29
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DLRO100E, 100X & 100H - '100A www.megger.com 2

A safety warnings
These must be read and understood before use. Retain these safety warnings for future reference.
CAUTION: THE INSTRUN/ENT MUST BF OPERATED ONLY BY SUITABLY TRAINED ANI' COMPETENT PERSONS
Users of this equipment and their employers are required by National Health and Saf:ty 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 guarcs must be in good order, clean and
with no broken or cracked insulation.
Fan filters and covers giving access to internal conductive parts must be correctlyfitted before use.
Testing inductive circuits can be hazardous: Tlre DLRO100 is a high power instrumeni, designed for testing resistive
loads. lt must NOT be used to test inductive loads.
DANGERI The instrument is not fully protected when switched off.
. Switch the instrument ON before connecting to the test subject.
. The test subject must be switched off, de-energised and checked before test cornections are made. Ensure that the
test subject cannot be re-energised whilst the instrument is connected.
. Do not leave the equipment unattended when connected to the test subject.
. Do not leave the equipment connected to the test subject after the test is completed.
The user must exercise caution when connecting to and disconnecting from the test subject.
. Always connect test leads to the instrument before attaching to test subject.
. Keep hands behind tactile barriers on probe clips and clamps when making or breaking connections.
. High current connections between the instrument and test subject must be secu-ed against accidental detachment
and must not be disengaged whilst test current is flowing.
. High current test leads must be a minimum of 3 milliohm resistance.
. Circuit terminals must not be touched during test.
. Do not disconnect the instrument from the test subject until the test current has stopped and the TEST warning
indicator is extinguished.
. Test leads and connections may become hot during use. Exercise caution when l-andling.
r Disconnect from the test subject before switching the instrument OFF.
DANGER! Some models can be operated by remote control. A test can be started a: any time by remote control. These
additional precautions must be taken for instruments with a remote control f unctior.
. Measurement connections must be handled onlywhen precautions have been taken to prevent a remote control
test sta rt.
. lf the remote control link should fail, the test must be stopped manually by pressing the TEST button.
lf this equipment is used in a manner not specified by the manufacturer, the protect on provided by the equipment may
be impaired.
Fan filters are user-serviceable. Disconnect all measurement leads and switch the ins-rument OFF before servicing the
fan filters.
There are no user-serviceable parts inside the instrument; all servicing, including fuse replacement, must be referred to
Megger approved service centres.
Use only Megger approved battery pack, and follow the instructions provided with the battery
Warning!This instrument contains a Lithium lon High Energy Battery Pack and a lit-rium coin cell.
. Do not pierce, damage, disassemble or modify the battery. The battery contains safety and protection devices
which, if tampered with may cause the battery to generate heat, rupture or igni:e.-
. Never heat (or dispose of) the battery in a fire.
r Do not subject the battery to strong impact, mechanical shock or excessive heat
. Do not expose the battery to water, salt water or other liquids, or allow the batt:ry to get wet.
. Never short-circuit or reverse the polarity of the battery pack.
. ln the event of a battery cell leaking, do not allow the released fluid to come intt contact with the skin or eyes. lf
contact has been made, wash the affected area with plenty of water and seek medical advice immediately.
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DLRO100E, 't00x & 100H - 1004 www.megger.com

Safety and hazard symbols used on the instrument
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Caution: refer to user instructions
Caution: risk of electric shock
Enclosure is dust proof and protected against
water splashes
Equipment protected throughout by
Double lnsulation,
+ Line Power / mains
600V ac rms maximum between terminals,
and between terminals and earth
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Equipment complies with current EU directives.
N 131 17 Equipment complies with current
"C tick" requirements.
Do not dispose of in the normal
waste stream.
Connect to earth for Voltage
measurement reference
Universal Serial Bus (USB)
ö:--ö IBluetootho
Measurement Connection
I 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 lV; Equipment connected between the origin of the low-voltage mains supply and the distribution panel
cAT ilt
Measurement category lll: Equipment connected between the distribution panel and the electrical outlets.
CAT II
Measurement category ll: Equipment connected between the electrical outlets and the user's equipment.
Measurement equipment may be safely connected to circuits at the marked rating or lower. The connection rating is
that of the lowest rated component in the measurement circuit.
WEEE Directive
The crossed out wheeled bin symbol placed on Megger products is a reminder not to dispose of the product at the end of its life with
general waste.
Megger is registered in the UK as a Producer of Electrical and Electronic Equipment. The Registration No is WEE/HE0146QT.
For further information about disposal of the product consult your local Megger company or distributor or visit your local Megger
website.
4
DLRO100E, 100X & 100H - 100A www.megger.com

General description
The new Megger DLRO100 range of Low Resistance Ohmmeters provide high accuracy with noise immunity, are robust yet light and
portable.
The range consists of three models:
I DLROl00E/EB has advanced features of configurable tests, manual, auto and continuous tests,
I DLRO100}7X8 in addition has internal memory storage for test records and USB connectivity,
I DLRO100H/HB in addition to the above has Bluetooth@, remote operation and smart device capability
Key features
I CAT lV 600 V AC / 500 V DC up to 2000 m on all test terminals for safe operation
I CAT lV 300 V up to 4000 m
I Lightweight 100 A battery powered unit for portability - 7.9 Kg (17 lbs)
I Li-ion battery for high power and fast charge - works from an AC supply if the battery is fully discharged
I High noise immunity for stable readings
I Smooth DC Output for circuit breaker testing
I lP54 (lid open) for protection against ingress during operation (1P65 lid closed)
f Adjustable 10 - 100 A output, 4 terminal measurement for flexibility
I Adjustable current ramp rates and test duration for f lexibility
I Battery capacity - 200 single tests or up to 2x 1 0 minutes continuous 1 00 A output for extended use
I Mains only units for manufacturing and production applications where AC is always available
I Ultra tough outer case construction designed for use in demanding environments with a flame retardant UL94 V0 inner
case for safety
I DualGroundrM - Using the optional DC clamp enables circuit breakeriesting with ground protection in place (100X &
1 00H variants) for safety
I Large, clear LCD for all light conditions
I Trme and Date stamped memory for recording of results (220 readings)
t Range and test mode rotary switches for simplicity of operation
I Memory Storage and USB download capability (100X & 100H variants) for effective results management
I Remote Operation - Control the instrument remotely via a PC or laptop (100H variants) for added safety
I Smart device support - Running a Power DB app on Windows 8 tablet or smart phone to populate unique asset lD's
(l00H variants) for efficient asset management
I Two year warranty - second year conditional on free product registration
This product and its accessories are covered by EU design registrations 002349134-0001 and 002349134-0002
This product and its accessories are the subject of patents pending.
DLRO100E, 100X & 100H - 1004 wwwmegger.com 5

lnstrument controls and indicators
2
3
4
5
Current terminals
-c1-c2
C1 - C2 LED
indicates continuity
on the C terminals
P1 - P2 LED
indicates continuity
on the P terminals
Potential terminal
-P1 -P2
Measurement earth
terminal
DualGroundrM terminal
100X and 100H only
Save button
'i 00X and 100H only
8. Range rotary switch
9. TEST button with
associated warning lamp
6
7
10.
11.
12,
13.
14.
Navigation / OK buttons
Test mode rotary switch
Backlight button
Display
LED indicating line
power / mains
Power socket15
16. USB Device port
100X and 100H only
11 . Cooling fans with
lP54 cover
DLRO100E, 100X & 100H - 100A www.megger.com 6

Preparations for Use
lnitial instructions
I Remove instrument, power lead and pouch from the packing box.
I Open the lid noting position of the IEC 60320 power inlet and U5B device port on the left panel
Test terminals are located to the right of the front panel.
I Read the safetY warnings.
I A quick reference is provided in the instrument lid.
I Keep the original packaging for re-use.
Power lead and battery charging
t lf the power lead supplied is not suitable for your AC connection, do not use an adaptor. Always use a Megger
approved power lead.
I Use the supplied AC lead ONLY'
I Supply voltage: 90 to 265 V rms ac at 50 / 60 Hz.
I A red LED illuminates when line power/mains is present.
I The battery will charge when an AC source is connected, except when a test is in progress.
I For optimum battery life, charge the battery after each use. Full charge duration is 2.5 hours.
I The battery must be charged between 0 'C and 40 "C ambient temperature. lf the battery detects a
temperature outside this range the battery symbol will flash and charging will be prevented.
I The battery should be recharged every 3 months if the instrument is left unused for long periods. This may take up to
30 minutes to indicate normal charging.
I lf the battery has been replaced or fails to recharge, follow instructions in 'Battery reset enable' paragraph to reset the
battery charge indicator.
I lf the battery fails to recharge after numerous attempts, contact a Megger approved service centre for advice.
Functional verif ication
Simply turning on the instrument at the test mode switch will initiate a start-up process and the display will respond. The initialisation
screen (right) shows the {irmware version,
Calibration
The DLRO100 is supplied with a calibration certificate.
An 15O17025 (UKAS) Calibration Certificate is available if ordered with the instrument.
Storage
lnstruments should be stored within its temperature and humidity specifications.
lntermittent operation limits
The DLRO100 is a high-power instrument and, as such, can generate significant heat. To prevent damage, the instrument contains
internal thermal proftction which can disable the test current if excessive temperature rise is detected. ln this event, the thermometer
symbol will be displayed on the screen. lf this should occur, switch the instrument off and allow it to cool before repeating the test' lf
possible, do not position the instrument in direct sunlight.
7
DLRO100E, 100X & 100H - 1004 wwwme9ger.com

Operating instructions
General operation
The DLRO100E, 100X and 1O0H are primarily controlled by two rotary switches and a TEST button used to start and stop a test (see
section entitled, "lnstrument control and indicators").
Test Mode rotary switch
The Test Mode rotary switch includes an 'OFF' position; the instrument switches on by
rotating the switch clockwise from this position. Test modes provided are:
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AUTO
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MAN
.il- Auto Continuous
Manual
Range rotary switch
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A light blue coloured section whrch derrotes memory functions; delete
records; download records via USB or Bluetootho and retrieve records.
(100X and l00H Only)
tA spanner enabling instrument and test settings.
A custom test selection, 1 0 A, 50 A and '1 00 A pre-set test currents
Save button
(100X and 100H only)
Backlight button
Navigate via Directional and
an OK buttons
TEST button to start and stop
a test.
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Lead connections
Test Leads
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P1,6 -P2
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c1 Leads connected to the instrument with the Kelvin arrangement
below showing correct positioning of Current (C 1,C2) and
Potential probes (P1,P2).
The earth terminal 4 is used to detect floating voltage on
the test subject relative to the C2 (0 V) terminal. High floating
voltage on the test subject could present a hazard to the user
and the DLRO. lf the test subiect is +200 mV from the C2 (0 V)
terminal, test will be inhibiteå. The noise symbol {u will show
when the test is inhibited. Disconnect from the earth terminal
when this feature is not in use.
The current terminals (C1 and C2) must be connected outside of
the potential terminals (Pi and P2), to ensure accurate readings.
c2
P1
P2
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Section of test piece under test.
P1 P2
C1 C2
DualGroundrM and DC Clamp connection
(0v)
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As an additional safety precaution, perform the test with both
ends of the test object grounded.
Connect the DC clamp to one of the ground connections. The
DC clamp measures current flowing through the ground loop
and the DLRO100 compensates for this current loss automatically
resulting in a more reliable reading.
Refer to the MCPD100L manual for how to use the DC current
clamp.
Connect the earth connector to a suitable earth. Do not leave
the earth connection un-terminated or floating.
DLRO100E, 100X & 100H - 1004 wwwme9ger.com 9

1. Testing modes
Manual and auto test
1.1 Preset test
100/50/10A - lnitial 1.2 Preset test
100/50i10A - Progress
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Select current on rotary switch.
Press test button to start the test. Active test screen
To conf igure date and time for saved results - refer to lnstrument
set-up section 2.6
1.3 User configured Manual and Auto test - lnitial 1.4 User configured Manual and Auto test - Progress
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Press test button to start a custom test Active custom test screen
To configure test setting for user configured test, date and time
for saved results - refer to lnstrument set-up section 2.6
Continuous test
1.5 Preset test 100/50/10A - lnitial
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1.6 Preset test 100/50/10A - Progress
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Press test button to start a continuous test.
To configure date and time for saved results - refer to lnstrument
set-up section 2.6
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D)DDD
DLRO100E, 100X & 100H - 100A
Active continuous test screen.
www.megger.com 10

1.7 User configured continuous test - lnitial
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Press test button to start a custom continuous test.
To configure test setting for user configured test, date and time
for saved results - refer to lnstrument set-up section 2.6
End of Test
1.8 User configured continuous test - Progress
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Active continuous test screen
1.9 End of test screen
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Display shows the current through the test piece, measured
voltage and calculated resistance. lf the required current is not
achieved the current value will f lash.
Test aborted
1.10 Test aborted by instrument
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1.11 Test stopped by user
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Aborted test - A number of conditions can cause an abort. This
example shows a bad connection. User stopped test by pressing the test button
DLRO100E, 100X & 100H - 1004 wwwmegger,com 11

2. lnstrument set-up
Charging and turning the instrument on
2.1 Charging screen - lnstrument Off
+ EIIF
2.2 Screen
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lnstrument switched off, mains connected and battery charging.
Fans will be running.
User settings
Successf ul initialisation
2.3 Set max current 2.4 Set test duration
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Maximum current adjusted between 10 A and i 00 A with Up
and DOWN arrows. Select OK to accept and progress to set test
duration.
For test durations of greater than 1 0 minutes the current setting
is limited to a maximum of 59A
2.5 Set Ramp Up/Down
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Test duration for the continuous test is adjusted with Up and DOWN
arrows. Minutes and seconds are selected with LEFT and RIGHT
arrows. Select OK to accept.
For currents of above 59A the test duration is limited to a
maximum of 10 minutes.
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Ramp Up/Down duration adjusted with Up and DOWN arrows.
Seconds and half seconds selected with LEFT and RIGHT ärrows.
Select OK to accept.
DLRO100E, 100x & 100H - 100A www.megger.com 12

Time and date (X and H models only)
2.6 Set date format
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2.7 Set date
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Change format with LEFT and RIGHT arrows. Adjust date by
selecting DOWN arrow or select OK to accept.
2.8 Set month
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Adjust month with UP and DOWN arrows. Navigate using LEFT
and RIGHT arrows or select OK to accept.
2.10 Set Time
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Adyust day with UP and DOWN arrows. Navigate using LEFT and
RIGHT arrows or select OK to accept.
2.9 Set year
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Adjust year with UP and DOWN arrows. Navigate using LEFT and
RIGHT arrows or select OK to accept.
2.11 Set Hours
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Adjust time by selecting DOWN arrow or select OK to accept. Adjust hours with UP and DOWN arrows. Navigate using LEFT
and RIGHT arrows or select OK to accept.
DLRO100E, 100x & 100H - 1004 wwwmegger.com 13

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2.12 Set minutes
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Adjust minutes with UP and DOWN arrows. Navigate using LEFT
and RIGHT arrows or select OK to accept.
Bluetooth@ (H models only)
2.13 Bluetooth@-Begin pair 2.14 Bluetooth@-Pairing
Pair instrument from PClSmart Device. Enter PIN 1234 on PC
Press and hold OK for 3 seconds to begin pairing, or press OK to
skip.
2.1 5 Bluetooth@-Paired
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Pairing complete for btl. Scroll using UP and DOWN arrows to
access other Bluetooth@ pairs. Select current pair with LEFT or
RIGHT arrows.
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DLRO100E, 100X & 100H - 100A www.megger.com 14

2.1 6 Bluetooth@-overwriting
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Select existing pair.
Press OK for 3 seconds to begin pairing process
Clamp gain (X and H models only)
2.17 Set clamp gain
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Adjust Gain with UP and DOWN arrows between 0.1 mV/A and 20.00 mV/A
Navigate using LEFT and RIGHT arrows or select OK to accept.
NOTE: The clamp must be zeroed before measurements start for accurate readings. The clamp current measurement is not displayed
on the instrument.
Buzzer settings
2.18 Buzzer settings - ON 2.19 Buzzer settings - OFF
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bEEP bEEP
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Press Up and Down arrows to adjust setting ON to OFF.
Select OK to set and proceed. Press Up and Down arrows to adjust setting OFF to ON.
Select OK to set and proceed.
NOTE: When in settings, user can exit by moving the Range rotary switch away from the setting position (Spanner icon)
'15
DLRO100E, 100X & 100H - 1004 www.me9ger.com

DLROl00A Resetting Battery Charge
Battery reset enable
2.20 Setup
Progress to Battery Reset screen,
'AC' is shown if charger lead plugged in
Remove lead to proceed.
2.22 Setup proceed
Press 'Ok'to proceed
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2.21Lead removed:
Press 'Up' key to proceed
2.23 Battery reset complete
Reapply the AC. Menu automatically proceeds to the next item with
battery symbol animated showing charge cycle.
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DLRO100E, 100X & 100H - 100A www.megger.com 16

3 Saving a test record (X and H models only)
Manual save
3.1 End of test 3.2 Completion of save
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Press the SAVE button to save results.
3.3 Results memory full
AFULL
lnternal memory is full.
Delete some results to create space
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Save completed.
Showing date, time and slot number for 2 seconds, then reverts
to the End of Test screen.
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DLRO100E, '100x & 100H - 1004 www.me99er.com 1l

Auto save and logging results
3.4 Auto Save - Auto and continuous
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Press save before running
i) Auto test - save all auto test results.
ii) Continuous test - log results every 5 seconds.
iii) lf internal memory is full, delete some records to create space
- refer to Saving a test record section 3.3
3.6 Continuous test progress screen - Logging results
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3.5 Auto test progress screen with auto save
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DLROl00E, 100x & 100H - 100A www.me9ger.com 18

4 Delete results
Delete single results
4.1 Delete results - Single
Delete last saved slot. Press OK to accept.
Delete all results
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4.2 Delete results - Progress screen
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dEL
Press OK to accept.
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4.3 Results screen-Delete ALL
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Select LEFT or RIGHT arrows to toggle dEL and dEL ALL
Press OK to accept.
Press OK to delete all results.
DLRO100E, 100x & 100H - 1004 www.me99er.com 19

5 Download a test record
Download single result
5.1 Download results - All 5.2 Download results - Progress screen
The countdown counter will show number of records being
downloaded.
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Select LEFT or RIGHT arrows to toggle dnl and dnl ALL.
Press OK to download all results.
Recall a test record
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5.3 Listing slot numbers 5.4 Test record
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Scroll up and down through results with Slot Number. press OK
to display results. Press OK to drill into result. Press OK to go back to previous
screen showing Slot Numbers.
Flash between Date & Time, Voltage & Current
NOTE: Display DMY/MDY
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DLRO100E, 100X & 100H - 100A www.megger.com