The Wandel & Goltermann EPM 1 is a Milliwatt Power Meter, frequency range DC / 10 Hz to 300 MHz. It is used for calibration purposes on all types of signal generators. It has high absolute accuracy of level measurement, excellent resolution of level, expended scale of +/-0,2 dB. True RMS measurements, independent of signal waveform. Calibration with built-in calibration source for 0 dBm and 0 dB. Can be used as well as constant level amplifier for voltage stabilization of a generator’s output.