The Ranger 1‑1‑0 PM6000 PowerMaster is a multi‑channel power quality monitor that measures up to three 600 V AC voltage inputs and three current inputs for real‑time energy logging, power factor, and fault detection in industrial systems. Common failure points on this class of units include degraded input transformers or shunt resistors, corrupted firmware memory, and failing analog front‑end ICs due to overvoltage or thermal stress. First‑check diagnostics: verify that the 48 V DC supply rail is within spec and stable; inspect all input connectors for corrosion or loose contacts; review any stored error codes or log entries for patterns such as “over‑current” or “self‑test failure.”[oss-gpt-20b]