HP E8257D

Functions

High-performance analog signal generator providing continuous wave and swept frequency outputs from 250 kHz to 67 GHz with exceptional phase noise and spurious characteristics. Features include narrow pulse modulation, high output power up to +26 dBm, frequency and amplitude switching speeds under 9 ms, and internal modulation capabilities including AM, FM, phase, and pulse. Interfaces include GPIB, LAN, and USB for remote control. Commonly used for local oscillator substitution, receiver testing, radar system evaluation, satellite communications testing, and general RF/microwave component characterization. Accepts external I/Q inputs for complex modulation generation.

Platforms

This instrument precisely generates high-fidelity RF/microwave signals up to 67 GHz, featuring accurate power, low phase noise, and comprehensive analog modulation capabilities including AM, FM, PM, and pulse. It operates as a standalone benchtop or rack-mount unit, integrating advanced frequency synthesizers and calibrated attenuators. Connectivity is via GPIB, LAN (SCPI commands), USB, and RF output (Type-N). It interfaces with external modulation sources, reference oscillators, and various devices under test (DUTs) for applications such as radar, satellite communication, component characterization, and receiver testing.

Applications

Used for characterization and testing of RF and microwave components, modules, and systems, including amplifiers, mixers, receivers, and radar. Supports receiver sensitivity, selectivity, and intermodulation distortion measurements. Applied in satellite communications, defense electronics, aerospace, and general-purpose laboratory research requiring high-performance analog signal generation, low phase noise, and high output power for stimulus.

Accessories

Front Panel RF OUTPUT: Type-N (female) for Opt 520 (20GHz); 2.92 mm (male) for Opt 532/540 (40GHz); 2.4 mm (male) for Opt 550 (50GHz); 1.85 mm (male) for Opt 567 (67GHz). Rear Panel Interfaces: GPIB (24-pin D-sub), LAN (RJ-45), USB (Type A & B), VGA (15-pin D-sub). Rear Panel Connectors: 10MHz REF IN/OUT (BNC-f). Optional Connectors: LF OUT (BNC-f), EXT1/2 IN (BNC-f) with Opt UNT; PULSE IN/SYNC OUT (BNC-f) with Opt UNU/HNS. Requires a power cord. Optional accessories include a rack mount kit.

Interfaces

Front panel RF output (Type-N female connector for frequencies up to 20 GHz, optional 2.4 mm connector for signals above 20 GHz up to 67 GHz), rear panel interfaces including GPIB, RS-232, and 10 MHz reference input and output (BNC connectors), auxiliary trigger input/output (BNC), and optionally installed external modulation input connectors for analog modulation signals. The unit is fully synthesized with internal OCXO timebase and requires AC mains power input with standard IEC connector. Optional accessories include external harmonic filters and rack-mount kits.

Specifications

RF signal generator, 250 kHz to 67 GHz, generates CW, AM, FM, phase modulation, and pulse modulation signals. Operates in benchtop or ATE systems. Interfaces via GPIB, LAN, and USB. Applications include component testing, receiver testing, and signal simulation.

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