HP / Agilent 3312A Function Generator

The HP/Agilent 3312A is a dual-channel function generator combining two independent signal sources with integrated modulation capability in a single compact chassis. The main generator produces sine, square, triangle, ramp, and variable-symmetry pulse waveforms from 0.1 Hz to 13 MHz across eight decade ranges, delivering up to 20 V p-p into open circuit or >10 V p-p into 50 Ω loads. A secondary modulation generator operating from 0.01 Hz to 10 kHz enables complex signal conditioning through amplitude modulation (0–100% depth), frequency modulation (±5% deviation), and linear sweep (>100:1 width). The instrument supports internal and external trigger, gate, and burst modes, with the main generator capable of being triggered by the modulation generator.

Technical Specifications Main Generator Output:

Frequency range: 0.1 Hz to 13 MHz (eight decade ranges)

Waveforms: Sine, square, triangle, ramp, pulse (variable symmetry 80:20 to 80% up to 1 MHz)

Output levels: 20 V p-p (open circuit), >10 V p-p (50 Ω at 1 kHz), 10 V p-p (50 Ω terminated)

Output impedance: 50 Ω ±10%

DC offset: ±10 V p-p (50 Ω), ±10 V maximum (open circuit), ±5 V maximum (50 Ω terminated)

Attenuator: >10,000:1 range with 1:1, 10:1, 100:1, 1000:1, and continuous (>10:1) settings; <5% error Signal Quality:

Sine THD: 30 dB below fundamental from 50 kHz to 13 MHz

Square rise/fall time: <20 ns

Triangle linearity error: 100:1 width (internal/external) Modulation Generator:

Frequency: 0.01 Hz to 10 kHz

Output level: >1.0 V p-p (10 kΩ load) Sync Output:

Impedance: 50 Ω

Level: >1 V p-p square wave (open circuit)

Key Features

Independent dual-channel architecture with cross-triggering capability

Frequency modulation and AM depth control without external equipment

Comprehensive sweep functionality across all frequency bands

Low-distortion sine output across audio and ultrasonic ranges

>10,000:1 continuous amplitude control with preset attenuation steps

Typical Applications

Component and subsystem characterization

Filter and amplifier frequency response testing

Modulation index and deviation measurement

Pulse timing and shape verification

System integration and signal conditioning

Physical & Compatibility Shipping weight: 15 lbs. External modulation inputs support AM, FM, and sweep signals. Trigger/gate/burst inputs accept external logic. This is a legacy instrument no longer in active manufacturer support.