The HP/Agilent 5355A Auto Frequency Converter is a plug-in module that extends frequency measurement capabilities of the 5345A Universal Electronic Frequency Counter across an expanded spectrum from 0 Hz to 110 GHz. An internal microprocessor automates measurement algorithms for both continuous wave and pulsed signals, computing input frequency and displaying results on the host counter. The module delivers down-converted IF signals and TTL-level gate and pulse outputs, making it suitable for precision microwave frequency characterization in demanding production and laboratory environments.
## Technical Specifications
• **Frequency Range:** 0 Hz to 110 GHz (configuration-dependent)
• **With Converter Heads:** 18 GHz (5356A), 26.5 GHz (5356B), 40 GHz (5356C)
• **Prescaled Input Option:** 0.4 GHz to 1.5 GHz
• **Sensitivity:** −25 dBm
• **Measurement Resolution:** 100 Hz
• **IF Output:** 80–375 MHz at 0 dBm nominal (rear panel IF OUT connector)
• **Gate Output:** TTL-level detected IF signal; TTL low indicates signal presence
• **Pulse Output:** TTL-level detected IF signal; TTL low indicates signal present
• **Pulsed Signal Detection:** RF bursts as short as 75 ns (110 GHz configuration)
## Key Features
• Automates pulsed and CW signal acquisition across continuous and microwave frequency bands
• Configurable gate time: acquisition time calculation depends on 5345A GATE TIME, sample rate, and external gate width
• Automatic calibration during 10 consecutive PULSE mode measurements following front panel changes or external gate width shifts exceeding 12%
• Accuracy defined as maximum deviation between successive measurements under constant conditions
• Down-converted IF output enables external signal analysis and validation
• Included BNC cable (HP Part No. 05355-60101) for integration with host counter
## Compatibility & Integration
Designed as a plug-in module for the HP 5345A Universal Electronic Electronic Frequency Counter. Operates with optional 5356A/B/C frequency converter heads to achieve extended frequency coverage. Accepts 0.4–1.5 GHz prescaled input for lower microwave range measurements without converter head attachment.
