Datasheet

Fast/long test leads mode: only has one user option,
which is manual/auto. ‘Manual’ starts the test when the
TEST button is pressed, ‘auto’ starts the test automatically
when the instrument detects continuity. In this mode,
the instrument settings are optimised for speed and, if
needed, the use of very long test leads. The test current is
only in one direction for speed, 1 A and above, resistance
is only displayed in mΩ. This test mode is ideal for many
applications but is focused for applications where: -
n The user is not technically trained. Use is simple, there
are no settings to change. Where test procedures
need to be very simple, “switch on, select this range
and press TEST” for example.
n The required minimum test current will be 1 A.
n The measurement will only be in mΩ. Non-technical
users can simply read a number and compare it with a
predetermined value.
n May need the use of very long test leads.
Example applications include:
n Wind turbine lightning protection (wing tip to ground
at base resistance)
n Subsea cable laying, checking cable resistance and
ground connections
n Manufacturing, including cable resistance, large cable
looms or assemblies etc.
Inductive resistance mode: tests with the test current
set to 1 A to speed up the charge time. The test current
will be auto ranged up as the inductance is charged.
Additional convenience is added with a clever ‘auto stop’
feature. The instrument will monitor the rate of change
and automatically stop the test as soon as the result is
stable.
Example applications include:
n Electric motors, small to medium in size, including
railway traction motor stator winding resistance
n Small power distribution transformers
n Continuity detection at less than 2000 Ω
SPECIFICATIONS
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
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.
TEST CURRENT OUTPUT
Normal resistance test mode:
Current ranges: 2 A, 1 A, 100 mA, 10 mA and 1 mA
Maximum compliance output voltage:
3.24 V (1 A mode) 2.2 V (2 A mode)
Current output accuracy:
Normal and inductive mode: ±10 %
Long lead test mode: +10 % -0%
at all battery conditions except
with low battery indication.
Thermal EMF/Seebeck effect compensation:
Yes, average of forward and reverse
test current measurements.
LOW RESISTANCE MEASUREMENT
Resistance measurement test modes:
Normal test mode, fast mΩ/long test
lead mode and inductive test mode
(resistance of inductive loads).
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
resistance.
Basic accuracy: Bi-directional test current mode:
+/- 1% +/- 2 digits.
Uni-directional test current mode:
+/- 1% +/- 10 digits.
Inductive mode or unidirectional
mode will introduce an undefined
error if an external EMF is present
DLRO2
Ducter™ Low Resistance Ohmmeter 2 A