Applications - Megger DLRO10HD User Manual

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
www.BiddleMegger.com
Applications
DLRO10HD / DLRO10HDX 5