The Keysight (formerly Agilent / HP) 8644A is a high-performance synthesized RF signal generator covering 251.5 kHz to 1030 MHz, designed for demanding R&D and manufacturing tests of communications systems. Known for its exceptional spectral purity, low phase noise, and highly accurate modulation capabilities, the 8644A utilizes a modular architecture to support diverse configurations, including options for high-stability oven timebases, enhanced low phase noise, and high-performance pulse modulation.
Specifications
Frequency
| Parameter | Value |
|---|---|
| Maximum Frequency | 1.03 GHz |
Output
| Parameter | Value |
|---|---|
| Maximum Output Power | +16 dBm |
| Output Power Range | -137 dBm to +16 dBm |
General
| Parameter | Value |
|---|---|
| Interfaces | GPIB (IEEE-488) |
Frequency Specifications
| Parameter | Value |
|---|---|
| Internal Reference Frequency | 10 MHz |
Amplitude / Output Level
| Parameter | Value |
|---|---|
| Output Impedance | 50 ohms |
Spectral Purity
| Parameter | Value |
|---|---|
| SSB Phase Noise with Option 004 (1 GHz Carrier, 20 kHz Offset) | < -136 dBc/Hz |
| SSB Phase Noise (515 MHz Carrier, 20 kHz Offset) | < -137 dBc/Hz |
Internal Modulation Source
| Parameter | Value |
|---|---|
| Internal Audio Frequency Range | 0.1 Hz to 400 kHz |
| Internal Audio Frequency Resolution | 0.1 Hz |
Input & Output Ports
| Parameter | Value |
|---|---|
| RF Output Connector Type | Type-N female |
| External Modulation Input Connectors | BNC female (front panel) |
| Internal Modulation/LF Output Connector | BNC female (front panel) |
| 10 MHz Reference Input Connector | BNC female (rear panel) |
| 10 MHz Reference Output Connector | BNC female (rear panel) |
Physical Characteristics
| Parameter | Value |
|---|---|
| Rack Unit Height | 4U |
Ordering Options & Accessories
| Parameter | Value |
|---|---|
| Option 001 | High-Stability Oven Timebase |
| Option 004 | Rear Panel RF Output and Modulation Inputs |
| Option 005 | Electronic Attenuator |
Options
| Parameter | Value |
|---|---|
| Option 010 | Reduced RF Leakage |
| Option 907 | Front Handle Kit |
| Option 908 | Rack Flange Kit |
| Option 909 | Rack Flange Kit with Front Handles |
| Option 910 | Extra Operating and Service Manual Set |
Environmental
| Parameter | Value |
|---|---|
| Maximum Operating Altitude | 4,600 m (15,000 ft) |
| Maximum Storage Altitude | 15,200 m (50,000 ft) |
Power Requirements
| Parameter | Value |
|---|---|
| AC Input Voltage | 90 to 132 Vac / 198 to 264 Vac (manually selectable) |
| AC Input Frequency Range | 48 to 440 Hz (for 90 to 132 Vac) / 48 to 66 Hz (for 198 to 264 Vac) |
RF Emissions
| Parameter | Value |
|---|---|
| Standard RF Leakage | < 1.0 µV induced in a 1-inch, 2-turn loop 1 inch from any surface |
Reference Oscillator
| Parameter | Value |
|---|---|
| Option 001 Reference Aging Rate (Per Day) | < 5 × 10^-10 |
| Standard Reference Aging Rate (Per Year) | < 2 × 10^-6 |
Interfaces
| Parameter | Value |
|---|---|
| Default GPIB Address | 19 |
Technology
Synthesized Signal Generator
Applications
RF Communications Testing, Receiver Sensitivity testing, Spectral Purity measurements, R&D