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.