The Keysight 53149A is a portable 46 GHz CW microwave frequency counter, power meter, and DC digital voltmeter integrated into a single instrument. It consolidates three essential test functions for field technicians and bench engineers working with microwave systems, telecommunications infrastructure, and RF circuit validation. The dual-channel architecture supports both low-frequency baseband measurements and high-frequency microwave analysis, eliminating the need to carry separate meters for frequency, power, and voltage monitoring.
Technical Specifications
Frequency Counter
• Two-channel architecture: Channel 1 covers 10 Hz to 125 MHz; Channel 2 extends to 46 GHz CW
• Selectable resolution from 1 Hz to 1 MHz
• Typical measurement time: 1/Resolution + 30 ms (Channel 1); 1/Resolution + Acquisition Time + 30 ms (Channel 2)
• Acquisition time (1 MHz FM rate, power meter off): 150 ms (FM Auto) or 125 ms (FM Off)
• FM tolerance to 20 MHz p-p at 10 MHz rate (up to 26.5 GHz); 12 MHz p-p above 26.5 GHz
• Amplitude discrimination (Channel 2, >300 MHz): Automatically selects largest signal when >10 dB above adjacent signals within 75 MHz spacing, or >20 dB above signals separated by >75 MHz
Power Meter
• Measurement range: -70 dBm to +44 dBm (sensor dependent)
• Resolution: 0.01 dB (log) or 0.1% full scale (linear)
• Basic accuracy: ±0.02 dB
• Power reference: 1.00 mW (±0.7% factory set, NIST traceable)
• Reference accuracy: ±1.2% worst case over one year
• Display modes: Absolute (dBm, Watts) and Relative (dB, %)
DC Digital Voltmeter
• Range: ±50 Vdc with 2 mV resolution
• Accuracy: ±0.25% of reading ±10 mV
• Input impedance: 0.5 MΩ nominal
• Damage level: ±60 Vdc
General
• 50 Ω input impedance (microwave)
• GPIB and RS-232 interfaces
• LCD display with switchable backlight
• Power: 100-240 VAC, 50/60 Hz
• Stores up to 9 complete setups
• Portable design with optional battery and DC input (Option 002)
– Key Features
• Integrated frequency, power, and voltage measurement eliminates multi-instrument setups
• True power meter with Keysight 8480 series sensor compatibility
• Enhanced stability available via oven timebase option
• Field-ready with optional carrying case and battery pack
– Typical Applications
• Point-to-point microwave link installation and maintenance
• Telecommunications infrastructure testing
• RF and microwave circuit characterization
• Automated test equipment (ATE) integration
– Compatibility & Integration
Supports Keysight 8480 series power sensors. Rack-mount configuration available via Option 1CM.
