HP 3325A Synthesizer Function Generator Option 002 Hewlett-Packard GPIB

HP 3325A Synthesizer Function Generator Option 002 Hewlett-Packard GPIB

The Hewlett-Packard 3325A is a benchtop synthesizer/function generator capable of producing sine, square, triangle, and DC offset waveforms with precise frequency synthesis. This unit is equipped with Option 002, which adds rear-panel Phase Modulation (PHASE MOD) and Amplitude Modulation (AMPTO MOD) BNC connectors for expanded modulation capabilities. The instrument communicates over GPIB (IEEE-488) for integration into automated test systems.

Specifications & What's Included

• Manufacturer: Hewlett-Packard (HP)
• Model: 3325A
• Type: Synthesizer / Function Generator
• Option: 002 (Phase Modulation and Amplitude Modulation rear BNC connectors)
• Interface: GPIB (IEEE-488) rear connector
• Front panel display: LED numeric readout
• Front panel controls: SWEEP (Start/Cont, Linear/Log, Start Freq, Stop Freq, Reset/Start, Marker Freq, Time), ENTRY keypad (Freq, Amptd, Phase, DC Offset), MODIFY arrows
• Function selector: Sine, Square, Triangle, DC Offset (front panel buttons)
• STATUS indicators: Local, Remote, Talk, Listen, SRQ
• Rear panel outputs: 10MHz Oven Output (0dBm), EXT KEY IN (1.00MHz), REF OUT (1MHz, 0dBm), SIGNAL, SYNC OUT (21–60MHz rear), AUX OUT, MARKER, DRIVE (0.1–10V), BLANK (BNC connectors)
• Option 002 rear panel: PHASE MOD and AMPTO MOD BNC inputs
• Rear panel: GPIB connector, IEC AC power inlet, cooling fan
• Form factor: Benchtop
• Calibration label visible on front panel, dated October 1996
• Unit only — no manual or accessories observed in photos

Applications

The HP 3325A was designed for laboratory and automated test environments requiring precise, synthesized signal generation. It was commonly used in R&D labs, production test benches, and calibration facilities where stable, programmable frequency outputs and waveform generation are needed. The GPIB interface allows the 3325A to be controlled by a host computer in IEEE-488 automated test systems. Option 002 extends its use to phase and amplitude modulation applications, making it suitable for testing modulation sensitivity of receivers, lock-in amplifiers, and phase-sensitive detectors. This instrument was a standard bench tool in electronics and physics labs throughout the 1980s and 1990s and remains in demand for legacy test system maintenance and general lab use.