The 548B Microwave Frequency Counter has automatic amplitude discrimination which enables the instrument to automatically select and measure the input signal with the highest level, and ignore all of the harmonics and other spurious signals that are present. The frequency range is 10Hz to 26.5GHz.

• Keyboard controlled frequency limit selection
• Power measurement to 0.1 dB resolution
• Power measurement accuracy to ±0.5 dB typical
• -30 dBm Sensitivity
• 200 Watt (+53 dBm) peak damage protection
• 10 dB automatic amplitude discrimination
• 200 ms acquisition time
• Up to 600MHz/sec tracking speed
• 20MHz P-P FM tolerance up to a 10MHz rate