The SPSR (Self-Powered Sensor) is a unique solution with internal rechargeable batteries that deliver the necessary power to any one of four Monarch Sensors. The SPSR offers a TTL compatible output that can be switch-selected as either positive-going 0-5 V pulses or negative-going 5-0 V pulses, provided through a BNC connector. Its internal rechargeable batteries enable up to 40 hours of operation between charges. For continuous operation, the SPSR can be powered by 115/230 V ac. These self-powered sensors play a crucial role in providing one pulse per revolution for a wide range of equipment, including vibration analyzers, spectrum analyzers, stroboscopes, data acquisition equipment, tachometers, balancers, waveform analyzers, and magnetic tape recorders.