The R2001D Communications System Analyzer with high stability oscillator comprises 12 instrument functions for transceiver testing: Spectrum Analyzer, Duplex Generator, Modulation Oscilloscope, Frequency Counter, AC/DC Digital Voltmeter, RF Wattmeter/Signal-Level Meter, General Purpose Oscilloscope, Multimode Code Synthesizer, Distortion/SINAD Meter, Sweep Generator, DTMF Encode/Decode, and Printer Port. Frequency range is 10kHz to 999.9999MHz with a resolution of 100Hz. Output in 50-ohms is 0.1 MicroV to 1Vrms on FM and 0.1 MicroV to 0.4Vrms on AM. The monitor mode measures frequency from 1MHz to 999.9999MHz. The auto-ranging CRT display has a resolution of +/-10Hz or frequency error. Input sensitivity is 1.5 MicroV for 10 dB EIA SINAD. The spectrum analyzer has a 75 dm dynamic range.