The PSD90-3 is a universal test set designed for AC and DC capacitive fuel, water, liquid oxygen, and engine oil systems. When paired with an aircraft‑specific interface, it enables users to test, troubleshoot, and isolate fuel system problems, calibrate fuel quantity indicators, and detect contaminated probes. Built for both flight line and bench environments, it operates on battery or external power. Key capabilities include measuring capacitance, DC voltage, insulation resistance, and distance to fault, simulating capacitance for indicator testing, and automatically identifying contaminated fuel probes during standard tests.

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