LOOP RESISTANCE TESTER DESCRIPTION AND OPERATION
avoid encountering these circumstances during resistance testing,
Boeing developed the LRT to provide a nonintrusive testing technique
that will not disturb connectors, is faster, and will ensure the
soundness of the overall circuit.
To properly use the LRT
and achieve the best results possible, maintenance personnel should
understand the following about the device: LRT elements, LRT technique,
loop troubleshooting, joint mode, sensing of coupler closure and
joint probe connection, maintenance requirements, safety features,
and calibration and certification.
The LRT comprises four elements: a drive current coupler, a sense
current coupler, joint probes, and an instrument assembly containing
the LRT battery and processor. The battery allows the LRT to be
used continuously for 8 hr without recharging.