The HP 3326A is a high-performance two-channel synthesized function generator from Keysight Technologies (formerly Agilent / Hewlett-Packard). It integrates two independent synthesizers into a single instrument under microprocessor control, enabling versatile multi-channel signal generation, coordinated sweeps, and precise phase offset control.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | HP-IB (GPIB) |
| Display | LED |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 100 / 120 / 220 / 240 V AC (selectable), 48 - 66 Hz |
| Operating Temperature | 0 to 55 °C |
| Dimensions (W×H×D) | 425.5 mm × 132.6 mm × 497.8 mm |
| Weight | 19 kg |
Frequency Characteristics
| Parameter | Value |
|---|---|
| Frequency Range (Sine) | 1 µHz to 13 MHz |
| Frequency Range (Square) | 1 µHz to 1 MHz |
| Frequency Resolution (below 100 kHz) | 1 µHz |
| Frequency Resolution (at or above 100 kHz) | 1 mHz |
| Available Waveforms | Sine, Square, and DC |
Amplitude and DC Offset
| Parameter | Value |
|---|---|
| AC Amplitude Range | 1 mV to 10 Vp-p |
| DC Offset Range | ±4.5 mV to ±4.5 V (dependent on selected AC amplitude) |
| Output Impedance | 50 Ω |
| DC Offset Availability | Can be added to either output in any mode |
Dual-Channel and Phase Control
| Parameter | Value |
|---|---|
| Operating Modes | Two-Channel, Two-Tone, Two-Phase, Pulse |
| Two-Channel Mode | Channels A and B operate independently |
| Two-Tone Mode | Channel B frequency must be within 100 kHz of Channel A |
| Two-Phase Mode | Channels A and B operate at the exact same frequency with a calibrated phase difference |
| Pulse Mode | Channel B is the complement of the Channel A output |
| Channel-to-Channel Phase Offset Range | ±720° |
| Phase Resolution | 0.01° |
Modulation and Sweep Capabilities
| Parameter | Value |
|---|---|
| Modulation Types | Amplitude Modulation (AM), Phase Modulation (PM) |
| Internal Amplitude Modulation | Available on Channel A in Two-Channel mode (Channel B as sine/square source) |
| External Amplitude Modulation | Available on all modes, independent for each channel |
| Internal Phase Modulation | Available on Channel A in Two-Channel mode (Channel B as source) |
| External Phase Modulation (Two-Channel) | Available on either or both channels |
| External Phase Modulation (Other Modes) | Applied to both channels simultaneously |
| Synchronous Phase Modulation | Available on both channels in Two-Tone, Two-Phase, and Pulse modes |
| Sweep Types | Linear (Linear Ramp, Triangular) and Discrete |
| Sweep Phase Continuity | Phase continuous frequency sweep |
| Linear Sweep Directions | Frequency can increase or decrease (up-down continuous in Triangular mode) |
| Discrete Sweep Sequence Capacity | Up to 63 frequency pairs |
| Discrete Sweep Switching Time (<1 MHz change) | Typically 10 ms |
| Coordinated Sweeping | Microprocessor-controlled coordinated sweeping of both outputs |
Options
| Parameter | Value |
|---|---|
| Option 002 High Voltage Frequency Range | DC to 1 MHz |
| Option 002 High Voltage Amplitude Range | 4 mV to 40 Vp-p |
| High Stability Timebase Option | Option 001 |
| High Voltage Output Option | Option 002 |
Timebase and Reference Oscillator
| Parameter | Value |
|---|---|
| External Reference Input | 1, 2, 5, or 10 MHz |
| Reference Output | 10 MHz |
System Interfaces and Control
| Parameter | Value |
|---|---|
| Instrument Calibration | Microprocessor-controlled internal self-calibration |
| Microprocessor Control | Simultaneous control of both synthesizers with simplified operation |
Performance
| Parameter | Value |
|---|---|
| Harmonic Distortion (Sine) | ≤ -80 dBc (0.1 Hz to 100 Hz), ≤ -70 dBc (100 Hz to 100 kHz), ≤ -50 dBc (100 kHz to 1 MHz), ≤ -40 dBc (1 MHz to 13 MHz) |
| Spurious Signals (Non-Harmonic) | ≤ -80 dBc |
| Phase Noise | ≤ -115 dBc/Hz at 10 kHz offset from carrier |
| Amplitude Flatness (Sine) | ±0.1 dB (100 Hz to 100 kHz, relative to 10 kHz) |
Standard Timebase
| Parameter | Value |
|---|---|
| Reference Output Frequency | 10 MHz |
| Reference Output Level | ≥ 0 dBm into 50 Ω |
| Aging Rate | ±5 × 10^-6 per year |
High Stability Timebase (Option 001)
| Parameter | Value |
|---|---|
| Option 001 Aging Rate | ±5 × 10^-10 per day (after 72 hours warm-up) |
| Option 001 Temperature Stability | ±1 × 10^-8 (0 °C to 55 °C) |
Rear Panel Connections
| Parameter | Value |
|---|---|
| External Modulation Inputs | BNC, AM and PM inputs for Channel A and Channel B |
| Sweep Control Outputs | BNC, X-Drive (0 to 10 V sweep voltage ramp) and Z-Blank (TTL) |
| External Sweep Trigger Input | BNC, TTL-compatible |
Sweep
| Parameter | Value |
|---|---|
| Sweep Time Range (Linear) | 20 ms to 1000 s |
| Sweep Time Range (Log) | 1 s to 1000 s |
Inputs & Outputs
| Parameter | Value |
|---|---|
| Sweep X-Drive Output | 0 to +10 V ramp |
| Rear Panel Sync Outputs | TTL compatible into ≥ 50 Ω, 0.1 Hz to 13 MHz |
| Z-Axis Blanking Output | TTL level |
| Marker Output | TTL level |
Modulation
| Parameter | Value |
|---|---|
| AM Modulation Depth Range | 0% to 100% |
Reference & Timebase
| Parameter | Value |
|---|---|
| Standard Timebase Temperature Stability | ±5 × 10^-6 (0 °C to 55 °C) |
Power Requirements
| Parameter | Value |
|---|---|
| Power Consumption | 150 VA maximum |
| Line Voltage Selection | 100 V / 120 V / 220 V / 240 V (selectable, +5% to -10%) |
| Line Frequency Range | 48 Hz to 66 Hz |
Environmental
| Parameter | Value |
|---|---|
| Operating Humidity | < 95% relative humidity (0 °C to 40 °C) |
| Storage Temperature | -40 °C to +75 °C |
Interfaces
| Parameter | Value |
|---|---|
| GPIB Interface Functions | SH1, AH1, T6, L4, SR1, RL1, PP0, DC1, DT1, C0, E1 |
Technology
Synthesized Function Generator
Applications
Coordinated multi-channel signal generation, two-tone testing, and phase-locked signal simulation