Advanced Marine Electrics and Electronics Troubleshooting by Edwin Sherman

Author:Edwin Sherman
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2007-01-22T16:00:00+00:00

Testing for a diode short circuit to ground. Connect one meter lead to either of the green wire terminals entering the device and the other meter lead to the case of the isolator. Continuity indicates a short circuit, and the isolator must be replaced.

galvanic isolators can be used to effectively block galvanic currents up to about 1.4 V. By putting two diodes in series, you can block 1.4 VDC. Galvanic isolators with capacitors are designed to offer extra protection for the diodes in the event of a continual, low-level AC leakage current running through the grounding wire. This is not uncommon, as discussed in Chapter 10. AC passes through a capacitor; DC will not. The capacitor provides a path for any AC leakage, or fault current for that matter, to bypass the diodes, but still effectively blocks DC current flow. When we discuss galvanic current, we are referring to direct current.

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