Keysight 5350A Microwave Frequency Counter

HP Agilent 5350A Microwave Frequency Counter
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Keysight 5350A
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Manual
500 MHz - 20 GHz, Microwave Frequency Counter
 
Keysight 5350A Specs
Input 1
Frequency Range 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
Frequency Range 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
Maximum Input 50 ohms: +10 dBm
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
High Resolution
1 M ohms mode:
0.001 Hz for <100 kHz input
0.01 Hz for <1 MHz input
0.1 Hz for <10 MHz input
1 Hz for >10 MHz input: 1-second gate