LCR Electronics (Norristown, PA) offers two new series of EMI filters for MRI shielded rooms. The 058 series filters are designed to mitigate any unwanted EMI noise through MRI room telephone, alarm, and data lines. The UL-recognized 059 series filters provide EMI suppression along the main power lines. The dual line filters are rated 120/277 VAC 50/60 Hz up to 50 A at 60 °C, 300/600 VDC lineto- ground and line-to-line, all with an impedance line-to-line rating of 600 ohms and a line-toground rating of 300 ohms. The series has a stop band of 100 dB from 20 KHz to 10 GHz for phone lines, 100 dB from 150 KHz to 10 GHz for data lines, and 100 dB from 14 KHz to 1 GHz for alarm lines. Individual or multiple 058 filters can be supplied pre-installed in an enclosure with removable covers for I/O connections and a threaded conduit pipe for installation against shielded room interference. The 059 filters are available in single, dual, and three-phase configurations and provide 100 dB attenuation from 5 MHz to 10 GHz per MIL-STD-220 and feature a sealed filter compartment with a removable shielded cover for input connections as well as a threaded conduit pipe for installation against shielded room interference.
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