The Wiltron 6647A Sweep Generator is a high performance, programmable sweep generator. All front panel controls are accessible via GP-IB (optional). Excellent signal purity and frequency stability. Power level accuracy to within 1 dB. Five sweep modes and three built-in markers. Can be phaselocked to an external counter for even greater frequency accuracy. Frequency Range: 10MHz to 18.6Ghz, Output level: > 10 mW (internally leveled)