The DLRO2 2 A Low resistance ohmmeter is a handheld instrument designed to give you fast, accurate, repeatable measurements, even in electrically noisy locations. The DLRO2 is the latest in a long line of instruments to proudly display the Ducter™ brand, the Ducter™ testers being as well-known and relied upon as Megger insunsulation resistance testers.
The DLRO2 can measure low resistance values across a wide range of applications, including railways, aircraft, and industry components. This tough device comes with a brand new ‘difference’ meter that allows repetitive measurements to be easily compared with an initial reference measurement. The difference meter also translates the percentage difference to a needle/pointer movement, making the changes clear to see.
If your applications require long test leads, then the DLRO2 can provide this without compromising test speed or safety. It has a dedicated long lead test to optimise the output, and this long test lead function is able to provide up to 1 A of test current into 4 ohms resistance. The DLRO2, with its optional cable reel test leads, is therefore ideal for testing wind turbine and avionic lightning protection applications.
Key Features
New Difference Meter for quick data comparisons
Use long leads at 1 A without compromising test speed
Safely test the resistance of inductive loads at 1 A
< 600 V active protection against inadvertent live connections without blowing a fuse
Ideal for outdoor use with protection against dust and moisture to IP54
Industry standard safety rated at CAT III 600 V/CAT IV 300 V
Specification
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: CAT III 600 V / CAT IV 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.
ENVIRONMENT
Noise immunity: Less than 1 % ±20 digits additional
error with 80 mV peak 50/60 Hz with on
screen noise limit indicator.
Less than 1 % ±20 digits additional
error with 80 mV peak 400 Hz with
on screen noise limit indicator.