Power Line EMI Adapter MSN12

MSN12 includes these accessories

MSN12 hand-held power line EMI adapters provide galvanic separation from high mains' voltages but a straight path for high-frequency signals so that you can connect your sensitive instrument to live power lines for analysis and quantification. MSN12 can measure electromagnetic interference (EMI) between any connections in a power outlet.  It also allows measurements of EMI between different grounded parts without creating ground loops using any oscilloscope or a spectrum analyzer, grounded via power outlet or not.

Among applications for EMI Adapters are:

  • Conducted emission measurements

  • Compliance with SEMI E176 Standard and IPC-A-610 EOS section

  • EMI audits, diagnostics and troubleshooting

A newer version of this adapter is MSN15 which has much wider bandwidth.  If your applications are limited to EMI in electrical outlets you may want to look at MSN17 EMI Adapter.


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All specifications are subject to change without notice
Typical Applications of MSN12
Transient on AC Mains
EMI from Switching Power Supply
Power Line Communication Signal
Application Notes
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Technical Articles

What is EMI?  A formal definition of Electromagnetic Interference is that it is a malfunction of equipment caused by excessive high-frequency signals, either radiated (via air), or conducted (via wires).  Often it is also called RFI - Radio Frequency Interference.  Most conventionally, EMI is understood as undesirable high-frequency signals, and EMI filters as devices that suppress such signals while preserving the "good" ones.         

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