Fluke 6675 Overview
The Systron Donner 6530 Frequency Counter can measure any CW signal in the range of 10Hz to 26.5GHz. It offers user selectable 50 ohm or 1 Mohm inputs for the 10Hz to 100MHz range and 50 ohm input for the 100MHz to 26.5GHz range. Sensitivity is -20 dBm to 26.5GHz.