Advantest R3681 Overview The Advantest model R3681 is a signal analyzer. Specifications Amplitude Accuracy: <+/- .2dB+frqrep+.13dB Amplitude Range: +30dbm - -160 dBm Dynamic Range: +30dbm - -160 dBm Frequency Range: 20 Hz - 32 GHz Frequency Resolution: 1 Hz - 3 MHz Frequency Spans: 20 Hz - 32 GHz Input Impedance: 50 ohms