SMRT Probe 4000™

Ridgetop’s SMRT Probe (Sample Mode Response Technique™) 4000 is a resonant voltage-sampling sensor, shown below, that is attached to a module or assembly to extract degradation signatures. SMRT Probe 4000™ monitors power systems by injecting a voltage stimulus to measure effective resistance and capacitance, enabling prognostic and degradation analysis. The system response will change due to loss of filter capacitance, changes in equivalent series resistance (ESR), MOSFET switch degradation, or other electrical degradation. The SMRT Probe sensing technique is based on Ridgetop’s patented RingDown™ technology. The sensor processing unit (SPU) located on the host Sentinel Power™ prognostic analysis platform controls SMRT Probe and processes the data sampled by the probe.

SMRT Probe 4000

The SMRT Probe 4000 software performs a digital signal processing (DSP) analysis of the captured frequency response, including anomaly detection, producing a prognostic signature. SMRT Probe’s time-stamped data output includes 16-bit resistance and 16-bit capacitance measurements.

As part of the Sentinel Power line of advanced diagnostic and prognostic tools, SMRT Probe 4000 sensor data can be supplied to Ridgetop’s Advanced Remaining Useful Life Estimator™ (ARULE™) prognostics analysis software tool to compute state of health (SoH) and remaining useful life (RUL).


  • Power converters and inverters
  • Power supplies
  • Electromechanical power drive stages, such as electromechanical actuators
  • Environmental probes in military and aerospace applications

Product Brief


White Papers and Application Note

Related Products

  • Sentinel Power™, a  product  line  that  includes power signature monitoring sensors, prognostic reasoners, and a visualization tool.
  • ARULE,  a reasoner to determine the remaining useful life (RUL) and state of health (SoH) of complex systems
  • Sentinel Motion™, a product  line  that  includes wireless vibration and motion signature monitoring sensors, prognostic reasoners, and a visualization tool
  • Sentinel Interconnect™,  a product  line  that  includes embedded monitors for detecting intermittencies and degradation in crucial system interconnects, and a visualization tool
  • Sentinel IT™, a  product  line  that  provides  solutions  for  improving  IT network  reliability and network health management (NHM).