Slip rings are widely used in experimental facilities to provide continuous electrical connection between rotating and stationary parts of a system. Their operational reliability directly affects the accuracy of measurements, the safety of test procedures, and the overall efficiency of equipment. Brush-type slip rings are the most common due to their simplicity, but they are subject to wear, oxidation, and intermittent contact loss under vibration and high-speed conditions. This paper presents the design and implementation of a multifunctional diagnostic module based on dry contact polling. The module combines two functions: monitoring the integrity of slip ring transmission channels and recording the state of specimen contacts during centrifugal tests. The methodology ensures galvanic isolation of measurement circuits and enables real-time detection of open, closed, or unstable contact states. A prototype was developed and integrated with a centrifugal test stand equipped with digital phase control. Experiments confirmed the quadratic dependence of centrifugal acceleration on rotor speed and demonstrated the ability of the proposed system to identify thresholds of contact degradation and loss of signal. The results show that the developed solution increases the reliability of data acquisition, enhances diagnostic informativeness, and can be permanently integrated into existing test facilities without major structural modifications.