Electrical overstress, or EOS, is a phenomenon where electrical signals applied to a circuit or a device exceed normal operating parameters.  These excessive electrical signals are abnormal by definition and are not a part of normal operation of the devices.

Measurement of high-frequency signals on power lines is important for analysis of PLC (Power Line Communication)- not only for observing and measurement of PLC signal itself, but also of interference signals on power lines that can cause problems for PLC.    One of the challenges in analysis of power line communication is separation of high-frequency signal from high voltage of AC mains so that instruments, such as oscilloscopes, spectrum analyzers and others, can safely observe and measure PLC signals.    OnFILTER' power line EMI Adapters MSN15 and MSN17 are designed specifically for this task.    They completely block 50/60Hz voltage and pass through only high-frequency signals providing complete galvanic separation from high voltage on mains and true balanced input.