The 2398 (henceforth called “this unit”) is a portable type monochrome LCD spectrum analyzer suited for signal analysis of radio equipment where the efficiency of frequency usage is increased and equipment is increasingly speeded and digitized. The 2398 adopts the synthesizer local system and can cover all frequencies from 9kHz to 2.7GHz Excellent in basic performance such as distortion, frequency/level accuracy, and easily operable, by following the display of the soft-key menu screen. Excellent cost performance with rich options to cope with various applications. Equipped with high accuracy calibration signals and an attenuator, it can accurately calibrate switching errors of LOG/LIN scales, resolution bandwidth, reference level, etc. Since frequency response data is corrected by built in calibration data, allowing high- accuracy level measurement for a wide range. As the switching of waveforms between frequency domain and time domain can be done by a touch and two waveforms are simultaneously displayed, signal analysis of both domains can be done efficiently. This unit provides the MEASURE function which can perform measurement of various applications without requiring the intervention of external controllers. Therefore, the performance evaluation of radio equipment can be easily done in terms of frequency, noise, occupied frequency bandwidth, etc.