Megger DLRO10HD, Руководство пользователя

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www.megger.com DLRO10HD and DLRO10HDX
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Applications
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.
Both instruments are well suited to measuring thick conductors, bonds and quality of welding because of their 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 galvanic 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
„ Wire and cable resistance
„ 300 V peak
„ Transmitter aerial and lightning conductor bonding
„ Quality control of resistive components