R3753 series is the 500MHz vector network analyzer, which has newly been designed based on a concept ” an optimum tool for each application” . We have fuily pursued high throughput such as 0.1 ms/points high-speed measurement at a resolution bandwidth (RBW) of 10kHz, 115dB wide dynamic-range measurement, and two-device simultaneous measurement with two-channel/four-trace display. Also , we have added the program sweeping function that can freely change the resolution bandwidth (RBW), output level, and input attenuator during sweep operation for each segment. Since the analyzer employs semiconductor switches for changing the output level and for switching the input attenuator, it allows the optimum high-speed level sweeping for the drive level test of the oscillator. With the built-in BASIC controller, a high-speed ATE system can be easily configured with no external controller for processes from adjustment to inspection. Features (1) High throughput • O.Tms/point high-speed frequency sweeping and 5ms short blanking time When two-channe! /four-trace (amplitude/phase) and RBW 10kHz • 0.1 ms/point high-speed level sweeping High speed and long life using semiconductor switches (2) Wide dynamic range • With automatic switching of input attenuator, H5dB wide dynamic range High speed and long life using semiconductor switches for switching input attenuator (3) Program sweeping function • For each segment, allows setting of frequency, output level, input attenuator, RBW, and settling time. (4) MS-DOS format disk • By using an MS-DOS personal computer, it is possible to easily create programs and analyze data because of the disk complied with MS-DOS format standard. • Three modes of storage capacity available (DD 720KB, HD 1.2MB, and HD 1.44MB)