Page 86 on Panasonic Hpx500 user manual stated that we need to fit a ferrite core within about 5cm (2 inches) from the DC 4 pin XLR power cable. Problem is, the power cables for my IDX Charger is flat and would not hold the ferrite code tight. As a result, the 2 ferrite cores will move freely along the length of the cables.
A simple solution that I found is just to put a zip tie cable on each end to prevent the ferrite core from slipping and moving freely. In case you are wondering, those Ferrite cores are used to limit RF(Radio Frequency) interference. You definitely want the cleanest power possible to your camera as spikes and interference could have adverse effect to the cam. In the Panasonic HVX200's manual, Panasonic even recommended ferrite core to be installed to the firewire cable.