What resolution must the ammeter have when measuring the galvanic isolator?

When measuring the galvanic isolator, the ammeter's resolution is crucial to obtain accurate readings of low currents, especially in marine applications, where precise measurements can be vital for the safety and effectiveness of the electrical system. A resolution of +/- 1 mA is often considered sufficient for this type of measurement. This level of resolution allows for the detection of small changes in current that may indicate issues within the galvanic isolator or related electrical components.

Ammeter resolution impacts the ability to detect and monitor small leakage currents that could lead to corrosion or other electrical problems over time. In the context of galvanic isolators, which are critical for preventing stray currents that can cause electrolysis and damage to metal parts of a vessel, having a resolution of +/- 1 mA provides a balanced level of sensitivity and is practical for most diagnostic situations.

While other options provide higher or lower resolutions, a resolution tighter than +/- 1 mA may not be necessary for typical marine applications, leading to complexity and potentially erroneous readings in a relatively stable environment. Conversely, a looser resolution would not allow for the necessary sensitivity to detect significant issues, particularly when monitoring for changes due to corrosion or other electrical faults.