Keysight / Agilent / HP 03325-66509 Oscillator Board

The Keysight/Agilent/HP 03325-66509 is an oscillator board that generates stable and precise reference frequencies for the HP 3325A Synthesizer/Function Generator. This component is essential for maintaining signal integrity and ensuring accurate test and measurement performance across the instrument’s full operating range. The board operates with exceptional frequency stability and low phase noise characteristics, making it critical for applications requiring high-resolution frequency synthesis and reliable waveform generation.

## Technical Specifications

• **Model:** 03325-66509
• **Manufacturer:** Keysight / Agilent / HP
• **Product Type:** Oscillator Board
• **Primary Function:** Reference frequency generation for HP 3325A
• **Frequency Stability (Aging Rate):** ±5 × 10⁻⁶/year
• **Frequency Stability (Ambient, 0° to +55°C):** ±5 × 10⁻⁸
• **Phase Noise:** Harmonics 65 dB down below 50 kHz
• **Reference Input:** Accepts external frequency reference 0 dBm to +20 dBm into 50 Ω, subharmonic of 10 MHz (1 MHz to 10 MHz typical)
• **NSN:** 5998-01-160-4468
• **Weight:** Approximately 3 lbs

## Key Features

• Enables HP 3325A sine wave generation from 1 μHz to 20.999 999 999 MHz with 11-digit frequency resolution
• Supports square waveform generation to 10.999 999 999 MHz
• Enables triangle and ramp waveform generation to 10.999 999 999 kHz
• Frequency resolution: 1 µHz below 100 kHz; 1 mHz above 100 kHz
• Supports external AM and PM modulation control
• Accepts external frequency reference inputs for synchronization

## Typical Applications

• Precision frequency synthesis and calibration
• Waveform generation for signal integrity testing
• Harmonic and subharmonic signal generation
• Instrumentation requiring stable frequency references

## Compatibility & Integration

This oscillator board is specifically designed as a component for the HP 3325A Synthesizer/Function Generator. It integrates with Option 001 (high-stability crystal oscillator—OCXO) and Option 002 (High Voltage Output) configurations. Related documentation includes the HP 3325A Operating and Service Manual (03325-90) and Service Manual 03325-90003.