Measurement instrument and system for enhanced constellation diagrams and method thereof

A method for creating a constellation diagram, the method comprising:

• providing a measurement instrument with at least a first and a second input paths, a calculation device connected to the at least first and second input paths, and a display device;
• receiving at the at least first input path and second input path a corresponding measurement signal from a device under test, wherein each measurement signal comprises a number of states;
• calculating an error vector corresponding to each state of each measurement signal;
• producing an average error vector for each state based on the error vectors of each measurement signal corresponding to the same state, wherein producing an average error vector comprises selecting the shortest vector of a group of vectors comprising the error vectors of each measurement signal for the one state and a vector whose components are the arithmetic mean of the components of the error vectors of each measurement signal for the one state;
• and
• creating a constellation diagram based on the produced average error vector for each state.

A measurement system, the measurement system comprising:

• a radiofrequency splitter circuit, configured to generate at least two channels by splitting a signal from a device under test into at least a first split
• measurement signal and a second split measurement signal;
• and
• a measurement instrument, the measurement instrument comprising:
• at least a first and a second input paths, wherein each input path is configured to receive a corresponding measurement signal from a device under test, wherein each measurement signal comprises a number of states;
• a calculation device connected to the at least first and second input paths, configured to calculate an error vector corresponding to each state of each measurement signal, and to produce an average error vector for each state based on the error vectors of each measurement signal corresponding to the same state, wherein the average error vector corresponding to one state is the shortest vector of a group of vectors comprising the error vectors of each measurement signal for the one state and a vector whose components are the arithmetic mean of the components of the error vectors of each measurement signal for the one state;
• and
• a display device, adapted to create a constellation diagram based on the produced average error vector for each state,
• wherein the measurement instrument is configured to receive each of the channels generated by the radiofrequency splitter circuit at a corresponding input path.