To perform a continuity test on the grounding of a PV module array, you need a calibrated digital multimeter (DMM) or a dedicated low-resistance ohmmeter (DLRO), and you must follow a systematic procedure to verify that the electrical path from the module frames to the main grounding. To perform a continuity test on the grounding of a PV module array, you need a calibrated digital multimeter (DMM) or a dedicated low-resistance ohmmeter (DLRO), and you must follow a systematic procedure to verify that the electrical path from the module frames to the main grounding. How to perform a continuity test on the grounding of a PV module array? To perform a continuity test on the grounding of a PV module array, you need a calibrated digital multimeter (DMM) or a dedicated low-resistance ohmmeter (DLRO), and you must follow a systematic procedure to verify that the. In this article, we'll show you how to locate a ground fault in a solar PV string using only a multimixer, a basic understanding of voltage behaviour, and a method proven in real-world installations. This test should only be performed by qualified personnel. DC systems can carry lethal voltages. This guide provides a step-by-step method for safely testing energized PV strings to locate intermittent ground faults using reliable tools and procedures. The exact procedure is described in the following sections. The lessons cover both central and string inverter systems - including configurations with harnesses, combiners, and. A ground fault occurs when a normally current-carrying electrical conductor, such as a positive or negative wire in a solar array, comes into contact with grounded metal components of the system, like the racking or conduit.