The Keysight/Agilent/HP 08645-90145 is a Service Diagnostics Manual for assembly-level repair and troubleshooting of the Performance Signal Generator Series. This manual covers models 8643A, 8644A/B, 8645A, 8664A, and 8665A/B, providing detailed diagnostic procedures and component-level repair guidance for field service technicians and maintenance engineers.
## Technical Specifications
**Frequency Performance**
Models operate from 252 kHz to 1030 MHz baseline, with Option 002 extending range to 2 GHz on select units. Frequency resolution reaches 0.01 Hz. Frequency agility enables switching times of <15 µs (128 to 2060 MHz), <85 µs (8 to 2060 MHz), and <500 µs (0.25 to 2060 MHz).
**Output Level & Power**
Output spans +13 dBm to -137 dBm with accuracy of ±1 dB for levels ≥-127 dBm. Select models achieve -139.9 dBm minimum. Overrange to +15 dBm is available with increased harmonic distortion. Option 005 provides electronic attenuator capability.
**Signal Purity**
SSB phase noise reaches -130 dBc/Hz at 1 GHz (standard) or -137 dBc/Hz with Option 004 low-noise configuration. Nonharmonic spurious suppression 35 dB on/off ratio with <100 ns rise/fall time and 0.5 µs minimum pulse width. Internal modulation sources include sine, square, triangle, sawtooth, and white Gaussian noise (0.1 Hz to 400 kHz) with two-tone capability.
**Sweep & Frequency Control**
Digitally stepped frequency sweep with linear or logarithmic selection and phase-continuous operation.
**Leakage Performance**
Standard <1 µV; Option 010 reduces leakage to <0.1 µV.
## Key Features
• HP-IB (IEEE 488.2) control interface
• Multiple performance options including high-stability timebase (001), low-noise modules (004), pulse modulation (008), and 2 GHz frequency counter (011)
• Reduced leakage option for stringent isolation requirements
• Versatile modulation waveform library
## Compatibility & Integration
Manual applies to 8643A, 8644A, 8644B, 8645A, 8664A, 8665A, and 8665B models. Assembly-level guidance supports HP-IB command integration and option-dependent configuration.
