HP-Agilent/Keysight 5350A

Microwave Frequency Counter Input 1 – Frequency 10 Hz to 20 GHz – Sensitivity: 500 MHz to 12.4 GHz: -25 dBm 12.4 GHz to 20 GHz: -20 dBm – Maximum Input +7 dBm – Resolution 1 Hz – 1 MHz selectable Input 2 – Frequnecy 10 Hz – 525 MHz – Sensitivity: 50 ohms: 10 MHz to 525 MHz, 25 mV rms 1 M ohms: 10 Hz to 80 MHz, 25 mV rms 50 ohms: +10 dBm – Maximum Input 1 M ohms: 1V rms – Coupling AC – Connector Replaceable fuse, type BNC (female) – Impedance selectable 1 M ohms nominal shunted by <70 pF or 50 ohms nominal - Resolution: Selectable, 1 Hz to 1 MHz 0.001 Hz for <100 kHz input 0.01 Hz for <1 MHz input - High Resolution 1 M ohms mode: 1 Hz for >10 MHz input: 1-second gate