Covering a frequency of 10Hz to 20.999MHz, the 3336B Synthesizer/Level Generator has performance characteristics that make it ideally suited for the telecommunications industry. It features precision level control, high spectral purity, internal frequency sweep and numerous user conveniences. It also includes HPIB as a standard feature for use in automatic test systems. The 3336B provides a single loop, fractional-N synthesis technique which allows synthesizer accuracy with 11 digits of resolution, plus completely phase continuous frequency sweep over any of the instrument’s frequency ranges. Microhertz resolution below 100kHz allows precise frequency measurements over range of 10Hz to 20.999999999MHz.