a small light - weight battery operated calibrator device provides a precise sine wave output for use in calibration of test equipment , such as a rf power meter or a spectrum analyzer . the calibration device includes two power levels , one − 40 dbm and one 0 dbm . the purpose of the two power levels is to obtain a slope and offset for correction of the rf power measuring device being calibrated . operation indication led lights are provided to indicate which of the two powers are in use , and if battery power is below acceptable levels . miniature low power components including a crystal oscillator and a divide by 2 integrated circuit that generates a precise square wave and a low pass filter for converting the square wave into a precise sine wave allows the calibrator to be battery operated and stored as a calibration component .