Measurement system and method of determining a noise figure of a device under test

A method of determining a noise figure of a device under test, the method comprising the steps of

• providing the device under test and a measurement instrument having a analysis circuit, the analysis circuit being configured to perform a first noise canceling technique and a second noise canceling technique, wherein the second noise canceling technique differs from the first noise canceling technique;
• connecting the device under test to the analysis circuit;
• receiving, by the analysis circuit, an output signal of the device under test;
• determining, by the analysis circuit, a first total error power based on the output signal by the first noise canceling technique, wherein the first total error power comprises systematic errors originating in the measurement system;
• determining, by the analysis circuit, a second total error power based on the output signal by the second noise canceling technique, wherein the second total error power comprises systematic errors originating in the device under test and in the measurement system, wherein the second total error power further comprises noise originating in the device under test and in the measurement system outside of the measurement instrument;
• and
• subtracting, by the analysis circuit, the first total error power from the second total error power, thereby obtaining an external noise power.