Waveform display apparatus of frequency sweep type for facilitating display of a high definition waveform

A waveform display apparatus of frequency sweep type, comprising:

• a measurement unit for measuring a signal to be measured by sweeping a frequency under a predetermined measurement frequency condition so as to obtain waveform data corresponding to the frequency;
• a display device for displaying the waveform data obtained by said measurement unit as developed on a frequency axis thereof;
• first parameter setting means for setting a first measurement frequency range, and setting a first scale factor for displaying waveform data in the first measurement frequency range on said display device;
• a first parameter memory for storing parameters set by said first parameter setting means;
• reference parameter setting means for setting a desired frequency on the frequency axis on said display device as a reference position, said desired frequency being within said first measurement frequency range corresponding to the waveform data displayed with the first scale factor;
• second parameter setting means for setting a second measurement frequency range, and setting a second scale factor enlarging the first scale factor, for a portion of the frequency axis which includes said desired frequency and set by the reference parameter setting means for displaying waveform data in the second measurement frequency range on said display device;
• a second parameter memory for storing parameters set by said second parameter setting means;
• and
• control means for controlling the first and second measurement frequency ranges in said measurement unit, and controlling a display position in said display device so as to cause a coincidence between said desired frequency at the reference position set by said reference parameter setting means and one frequency in the second frequency range at the reference position, and to permit to display the waveform data in the second frequency range according to the second scale factor.