What three test loads are used to calibrate an RF vector network analyzer?
50 ohms, 75 ohms, and 90 ohms
Short circuit, open circuit, and 50 ohms✓Correct answer
Short circuit, open circuit, and resonant circuit
50 ohms through 1/8 wavelength, 1/4 wavelength, and 1/2 wavelength of coaxial cable
Explanation
Calibration solves for the analyzer's systematic error terms by measuring standards whose reflection is known and widely separated, namely a short, an open and a precision load equal to the system impedance. Assorted fixed resistors or lengths of cable do not provide that set of known reflections.