Keysight / Agilent / HP 3325A Synthesizer/Function Generator

The Keysight/Agilent/HP 3325A is a synthesizer/function generator combining precision signal generation with full programmability for ATE systems and electronic development. It generates sine, square, triangle, and ramp waveforms from 1 µHz to 21 MHz (sine), with auxiliary outputs extending to 61 MHz. Frequency resolution reaches 1 µHz below 100 kHz and 1 mHz above, backed by ±5 × 10⁻⁶ accuracy. The instrument delivers 1 mV to 10 V peak-to-peak output into 50 Ω loads with selectable amplitude display in V rms or dBm. Phase-continuous logarithmic, linear, and discrete sweeps span the full frequency range with variable sweep times and marker output. External AM and PM modulation, variable phase offset to ±719.9°, and DC offset to ±4.5 V (±18 V with Option 002) enable complex signal conditioning. Sine harmonics measure 65 dB down below 50 kHz; square waves exhibit ≤20 ns rise/fall time; triangle and ramp linearity holds to 0.05%. Ten front-panel storage registers recall instrument setups instantly. HP-IB programmability integrates into automated test systems. External reference input (0 dBm to +20 dBm, 1 MHz to 10 MHz) enables phase-locking to external standards. Warm-up to specified accuracy requires 20 minutes. Optional high-stability reference (Option 001) improves aging to ±5 × 10⁻⁸/week; Option 002 extends output capability. Housed in a compact 5.25″ × 16.75″ × 19.63″ package drawing 90 VA, the 3325A operates across 0°C to 55°C at up to 95% relative humidity.