DLRO 10 and DLRO 10X Digital Microhmmeter

DLRO 10 and DLRO 10X Digital Microhmmeter
DLRO 10 AND DLRO10X
Digital Microhmmeter
DLRO 10 and DLRO 10X
Digital Microhmmeter
DESCRIPTION
DLRO 10 and DLRO 10X set the standards for low resistance
measurement. DLRO 10 and DLRO 10X are fully automatic
instruments, selecting the most suitable test current up to 10 A
d.c. to measure resistance from 0.1 µΩ to 2000 Ω, on one of seven
ranges.
For users who desire more control over the measurement process,
DLRO 10X uses a menu system controlled by a two-axis paddle to
allow the user to manually select the maximum test current.
n
Auto current reversal cancels standing emfs
n
Protected to 600 V
n
Automatically detects continuity in
potential and current connections
n
Multiple operating modes including fully
automatic
n
Alpha-numeric keypad for entering test
notes (DLRO 10X)
n
User selectable high and low limits
(DLRO 10X)
n
Printer output and memory (DLRO 10X)
To assist operator safety and ease of use, both instruments are
supplied complete with a pair of duplex handspikes with 1.2 m
(4 ft) leads. One of the probes is fitted with LED’s, which duplicate
indicators on the instrument display indicating that all four contacts
have been made, the presence of a high voltage across the load,
and the presence of current flow while a load is discharging. A full
range of test leads is available with probes, clamps and Kelvin clips.
Both instruments are built into a strong, lightweight case that is
equally at home in the field or in the laboratory. Light enough to
be worn around the neck, they are small enough to be taken into
areas that were previously too small to access.
The instruments are supplied as standard with a Nickel Metal
Hydride (NiMH) battery pack. The battery packs are interchangeable so that an exhausted battery may be recharged using
the external charger supplied while testing continues using a spare
pack. Although full charging will take 4 hours, a fast charge mode
allows the battery to be 90% charged within 2 1/2 hours from a 12
volt battery or from a standard 120/230 V AC supply via the supplied
charger. The battery pack contains its own battery state indicator,
which allows the charge-state to be monitored, even without being
connected to the instrument.
DLRO 10 uses a large, bright 4 1/2 -digit LED display while DLRO
10X has a large, backlit LCD display. Normally, measurements are
made with forward and reverse currents to cancel the effects of
any standing voltages across the test sample.
In addition an optional mains / line power supply, the DLRO10LPU
is available. This enables the instruments to be directly powered
from 90V to 264V, 50/60Hz ideal for repetitive testing applications
such as manufacturing production line use.”
The average value is then displayed within 3 seconds, to a basic
accuracy of 0.2%. DLRO 10X displays both forward and reverse
measurements as well as the average of the two.
DLRO 10X is fitted with RS232 communications that will allow
results to be downloaded in real time or stored for later retrieval.
DLRO 10X allows the user to set high and low pass limits, thereby
enabling simple go-no-go testing.
Up to 700 sets of results may be stored within DLRO 10X complete
with notes containing up to 200 characters which may be added
using the on board keypad. These results can also be downloaded
to a PC.
DLRO 10X also adds real time download of results and on board
storage for later download to a PC.
At the end of a test DLRO10X will store the test results, as well as
any notes relevant to the test.
DLRO 10 AND DLRO 10X
Digital Microhmmeter
MEASUREMENT MODES:
A variety of measurement modes are available. Since the introduction
of V2.0 firmware, Normal, Auto, Continuous and Inductive mode are
available on both the DLRO 10 and the DLRO 10X.
DLRO 10 will display the average of the measurements achieved
using forward and reverse current, while DLRO 10X displays both
individual measurements and the average.
Normal mode initiates a test by pressing the Test button on the
instrument front panel after connecting the test leads. Continuity
of all four connections is checked, forward and reverse currents
are applied.
Auto mode allows forward and reverse current measurements to
be made and the average displayed simply by making contact with
all four probes. This mode is ideal when working with the supplied
handspikes. Each time the probes are removed and reconnected to
the load another test will be performed without the need to press
the test button on the instrument.
Continuous mode allows repeated measurements to be made
on the same sample. Simply connect the test leads and press the
test button. The measurement is updated every 3 seconds until the
circuit is broken.
Inductive mode is intended for use when measuring inductive
loads. When measuring inductive loads it is necessary to wait for
the voltage to stabilise. This means that the measurement could
take a few seconds or several minutes. The test leads are firmly
connected to the item to be measured and the Test button is
pressed. The instrument will pass a current through the sample
and wait for the voltage to stabilise. If possible the current will
be increased. This procedure will be repeated until the voltage
detected falls into the range 15 mV to 200 mV. The instrument will
then continue to take readings, which will gradually decrease to the
true value as the voltage stabilises further. The operator decides
when the result is stable and presses the test button to terminate
the test. Measurement is made with forward current only.
Unidirectional mode, on DLRO 10X only, applies a current in one
direction only. This does not enable any standing emfs to be negated
but speeds up the measurement process. Test starts automatically
when probes are connected.
APPLICATIONS
The needs for accurate low resistance measurement are well
known and very diverse. They range through Goods Receiving
inspection of components to ground bonding and welded joints.
Typical applications include, but are not limited to, making d.c.
resistance measurements of:
n
Switch and contact breaker resistance
n
Busbar and cable joints
n
Aircraft frame bonds and static control circuits
n
Integrity of welded joints
n
Inter-cell connections on battery systems up to 600 V peak
n
Quality control of resistive components
n
Transformer and motor winding resistance
n
Rail and pipe bonds
n
Metal alloys, welds and fuse resistance
n
Graphite electrodes and other composites
n
Wire and cable resistance
n
Transmitter aerial and lightning conductor bonding
FEATURES AND BENEFITS
n
Small, lightweight and portable - can be used in tight places,
reduces the need for extra long leads and two person operation.
n
Four terminal resistance method shows the true resistance of the
item under test.
n
Bright LED (DLRO 10) and LCD (DLRO 10X) displays are easily
visible under all lighting conditions and reduce human error.
n
Automatically applies forward and reverse currents which cancel
out any standing voltages across the sample under test.
n
Checks for undue noise during measurement, reducing the
possibility of recording the incorrect result.
n
Automatically detects continuity in P and C circuits, preventing
erroneously high reading to be taken due to high resistance contact.
n
Battery module has a battery condition indicator allowing the user
to check the state of spare batteries without connecting to the
instrument.
n
RS232 connector on the DLRO 10X allows downloading of results
in real time or stored for later retrieval.
DLRO 10 AND DLRO 10X­
Digital Microhmmeter
Full scale volts
Resistance ranges
Test current
Full Scale
Resolution
Accuracy*
Resistive
Inductive
Resistive
Inductive
1.9999 mΩ
0.1 µΩ
±0.2% ±0.2µΩ
20 mV
n/a
10 A
n/a
19.999 mΩ
1 µΩ
±0.2% ±2 µΩ
20 mV
20 mV
1A
1A
199.99 mΩ
10 µΩ­
±0.2% ±20 µΩ
20 mV
200 mV
100 mA
1A
1.9999 Ω
100 µΩ
±0.2% ±0.2 mΩ
20 mV
200 mV
10 mA
100 mA
19.999 Ω
1 mΩ
±0.2% ±2 mΩ
20 mV
200 mV
1 mA
10 mA
199.99 Ω
10 mΩ
±0.2% ±20 mΩ
20 mV
200 mV
100 µA
1 mA
1999.9 Ω
100 mΩ
±0.2% ±0.2 Ω
200 mV
200 mV
100 µA
100 µA
DLRO 10
Measurement:Mode:
Manual, Auto, Continuous, Inductive
Control: Fully Automatic
DLRO 10X
Manual, Auto, Continuous, Inductive,
Undirectional
Fully Automatic/Manual
Speed: <3s for forward & reverse current and to display average
Display: Measurement:
Range and Safety:
Test Method:
4 1/2 digit seven segment LED
LED indication
Large backlit LCD
Single cycle reversing d.c. ratiometric measurement -average result display.
Test Current: Accuracy:
±10%
Stability: <10 ppm per second
Maximum Lead Resistance:
100 mΩ total for 10 A operation irrespective of battery
condition.
Voltmeter input impedance:
> 200 kΩ
Hum rejection:
Less than 1% ±20 digits additional error with 100 mV peak 50/60 Hz. on the potential leads.
Warning will show if hum or noise exceeds this level.
Data:
Transfer:
Real Time or from storage via RS232
Storage:
700 tests
Memo Field:
Battery:Capacity:
Up to 200 characters per test via integral alphanumeric keypad
7 Ah NiMH rechargeable
Life: Typically 1000 x 10 A tests before recharge
Recharge: Via external 90 V - 260 V 50/60 Hz charger or from 12 to 15 V dc supply
Charging Rate:Standard:
2.5 hours to 90% capacity, 4 hrs for full charge
Temperature: +5 ºC to +45 ºC (41 ºF to 113 ºF) at full specification
-10 ºC to +50 ºC (14 ºF to 122 ºF) at reduced accuracy
Operation:
Storage -30 ºC to +70 ºC (-22 ºF to 158 ºF)
Co-efficient:
Slow charging: <0.01% per ºC over range 5 ºC to 40 ºC (<0.006% per ºF from 4 1ºF to 104 ºF)
Humidity (max):
+10 ºC to +45 ºC (50 ºF to 113 ºF)
Altitude (max):
90% RH @ 40 ºC (104 ºF) non-condensing
Safety:
2000 m (6562 ft) to full safety specifications
EMC:
In accordance with IEC61010-1 600 V Category III - only when DH6 leads are used.
In accordance with IEC61326-1
Dimensions:
220 x 100 x 237 mm (8.6 x 4 x 9.5 in)
Weight:
2.6 kg (5 3/4 lb.) including battery module
* The accuracy stated assumes forward and reverse measurements.
Inductive mode or undirectional mode will introduce an undefined error if an external EMF is present.
DLRO 10 AND DLRO 10X­
OPTIONAL MAINS / LINE POWER SUPPLY UNIT
The DLRO10 and
DLRO10X may also
be powered from an
optional mains / line
power supply unit the
DLRO10LPU. This unit
is simply fitted to the
instrument in place of the
standard battery pack.
When in use a red LED is illuminated when the
instrument is powered from a mains / line power supply
The DLRO10X is seen here fitted with the optional
DLRO10LPU
Ideal for repetitive testing applications such as
manufacturing production line use
ORDERING INFORMATION
Item (Qty) Order No.
DLRO 10 Digital Low Resistance Ohmmeter 6111-428
DLRO10X Digital Low Resistance Ohmmeter
6111-429
Complete with
7 Ah NiMH battery module. 6121-492
DH4 Duplex handspikes (2),
one with indicator lights. 1.2m / 4 ft 6111-503
Battery charger for operation from 115/230 V
.
50/60Hz supply. 6280-333
Cigar lighter adapter for battery charging. 6280-332
User guide. 6172-473
Warranty book. 6170-618
Optional accessories at extra cost
Carrying case for DLRO10/10X
and all standard accessories. 6380-138
Carrying case for optional lead sets. 18313
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
Replacement tips for DH4, DH5 and DH6 hand
spikes.
Needle point 25940-012
Serrated end 25940-014
DLRO10LPU-EU Mains power attachment - Schuko plug
1003-172
DLRO10LPU-UK Mains power attachment - UK plug
1003-093
DLRO10LPU-US Mains power attachment - US plug
1003-171
Optional test leads at extra cost
Duplex Leads
DH5 straight duplex handspikes (2).
One has indicator lights. 2.5m/8ft 6111-517
DH6 Duplex handspikes (2) suitable
for working on 600 V. systems. 2.5m/8ft 6111-518
Duplex Handspikes (2) with spring
UK
Archcliffe Road Dover
CT17 9EN England
T +44 (0) 1304 502101
F +44 (0) 1304 207342
UKsales@megger.com
UNITED STATES
4271 Bronze Way
Dallas TX 75237-1019 USA
T 800 723 2861 (USA only)
T +1 214 333 3201
F +1 214 331 7399
USsales@megger.com
Item (Qty) Order No.
loaded helical contacts. 2m/7ft 242011-7
2.5m/8ft 6111-022
5.5m/18ft 242011-18
only 1 lead supplied
6m/20ft 6111-023
9m/30ft242011-30
Straight Duplex Handspikes (2)
Heavy Duty with fixed contacts. 2m/7ft 242002-7
5.5m/18ft242002-18
9m/30ft 242002-30
Duplex Heavy Duty 5cm (2”) C-Clamps. (2) 2m/7ft 242004-7
5.5m/18ft242004-18
9m/30ft 242004-30
Duplex handspikes with replaceable
Needle Points 2m/7ft 242003-7
Duplex 1.27 cm (1/2 “)
Kelvin Clips. (2) gold plated 2m/7ft 241005-7
silver plated 2m/7ft 242005-7
Duplex 3.8 cm (11/2”)
Kelvin Clips. (2) 2m/7ft 242006-7
5.5m/18ft 242006-18
9m/30ft 242006-30
Single leads
Single handspike (1) for potential measurement.
2m/7ft 242021-7
5.5m/18ft 242021-18
9m/30ft 242021-30
Current clip (1) for current
connections. 2m/7ft 242041-7
5.5m/18ft 242041-18
9m/30ft 242041-30
OTHER TECHNICAL SALES OFFICES
Valley Forge USA, College Station USA, Sydney
AUSTRALIA, Täby SWEDEN, Ontario CANADA,
Trappes FRANCE, Oberursel GERMANY, Aargau
SWITZERLAND, Kingdom of BAHRAIN, Mumbai
INDIA, Johannesburg SOUTH AFRICA, Chonburi
THAILAND, Malaga SPAIN
Registered to ISO 9001:2008 Cert. no. Q 09250
Registered to ISO 14001-2004 Cert. no. EMS 61597
DLR10_DLRO10X_DS_en_V17
www.megger.com
Megger is a registered trademark
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