Apparatus and method for eliminating phase skew in a multi-channel data acquisition system

An apparatus for eliminating phase skew in a multi-channel data acquisition system, comprising:

• means for receiving analog input signals from an electric power system on a plurality of channels, wherein successive sampling of analog input signals on a plurality of channels will ordinarily result in a phase skew between channels;
• means for sampling the input signals on each channel at predetermined time intervals;
• and
• means on each channel for low pass filtering the received input signals, wherein each low-pass filter includes a delay characteristic, the delay characteristic of the low-pass filters, respectively, compensating for the sampling delay of each channel so that the sampling of the signals on the respective channels is such that the phase skew between the channels is substantially zero.

A method for eliminating phase skew in a multi-channel data acquisition system, comprising the steps of:

• receiving analog input signals from an electric power system on a plurality of channels, wherein successive sampling of analog input signals will ordinarily result in a phase skew between channels;
• sampling the input signals on each channel at predetermined time intervals;
• and
• low-pass filtering the received input signals on each channel, wherein each low-pass filter includes a delay characteristic, the delay characteristic of the low-pass filters, respectively, compensating for the sampling delay of each channel, so that the sampling of the signals on the respective channels is such that the phase skew between the channels is substantially zero.