The Model 3335A Synthesizer/Level Generator is a wide range source operating over the range of 200 Hz to 80 MHz with output resolution of .001 Hz. The Synthesizer/Level Generator is capable of making a step frequency sweep both automatically or manually under operator control from the keyboard. Output amplitude is selectable over the range of + 13.01 dBm to - 86,98 dBm for the 50 ohm output and + 11.25 dBm to - 88.74 dBm for the 75 ohm output. The 3335A Synthesizer/Level Generator provides three communications-oriented options in addition to the standard 50 ohm and 75 ohm output impedance. Options 002 and 004 provide output impedance of 75 ohms unbalanced, 124 ohms balanced and 135 ohms balanced each terminated in equivalent WECO output connectors (Option 004 contains miniature connectors). Option 003 provides a 75 ohm unbalanced BNC output and a 150 ohm balanced BNC pair output.