Patent ID: 6861833

Claim:
In a method in which a signal being measured is converted in a mixer into an intermediate frequency signal having an intermediate frequency F i by means of a frequency sweep signal, a method of measurement by sweeping frequency conversion characterized by a first measuring step of using a sweep signal having a frequency which is equal to a frequency in a range of set-up frequencies added with the F i to determine measured data; a second measuring step of using a sweep signal having a frequency which is equal to the frequency in the range of set-up frequencies from which the F i is subtracted to determine measured data; there being M intermediate frequencies F i where M is an integer equal to or greater than 2; performing the first measuring step for each intermediate frequency F i ; performing the second measuring step for each intermediate frequency F i ; and applying an image elimination processing to the M items of measured data obtained during the first measuring step which is repeated M times and M items of measured data obtained during the second measuring step which is repeated M times by determining data all having an equal value and data having a minimum value for a same measured frequency point.