Apparatus for measuring the ratio of electrical signals, electric component measuring instrument, method for calibrating electric component measuring instruments and method for measuring the ratio of electrical signals

A method of measuring the ratio of electrical signals, comprising the steps of:

• measuring a first received electrical signal pertaining to a first electrical signal with a first measuring means to obtain a first measurement;
• measuring a second received electrical signal pertaining to a second electrical signal with a second measuring means to obtain a second measurement;
• measuring a third received electrical signal pertaining to said first electrical signal with said second measuring means to obtain a third measurement;
• measuring a fourth received electrical signal pertaining to said second electrical signal with said first measuring means to obtain a fourth measurement;
• and
• calculating a ratio to be measured pertaining to the ratio of said first and second measurements and the ratio of said third and fourth measurements, wherein a measurement is obtained for a ratio to be measured, which forms a bilinear equation with the ratio of said first and second electrical signals exclusively input to said first and second measuring means connected to a first and second output terminal of a switch means, said switch means comprising a first input terminal for receiving said first electrical signal;
• a second input terminal for receiving said second electrical signal;
• a first and second output terminal;
• and said switch means having a first state, wherein said first input terminal and said first output terminal are connected and said second input terminal and said second output terminal are connected, and a second state, wherein said first input terminal and said second output terminal are connected and the second input terminal and the first output terminal are connected.