NST and its staff has been involved in transit EMI investigations since the early 1980’s when the problems first surfaced between AF track circuits and vehicle propulsion and substation systems in the transit industry. NST is familiar with both the design of the track circuits and cab signals and their susceptibility to EMI. We have developed field measurement methods that not only confirm compatibility but can demonstrate operating margins in the actual environments. We have developed full EMI programs for our customers including, Assurance Plans, Product and system design reviews, laboratory testing and procedures, field testing and procedures, and final EMI reports.
We are completely familiar with all required UMTA/FTA test standards related to conducted, induced, and radiated EMI.
Recently, we have expanded our capability to also include measurement of vehicle emissions to demonstrate specification compliance.