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The HP 3326A Two-Channel Synthesizer combines two independent synthesizers, flexible modulation, and control circuitry into a single, powerful package.  This single instrument can provide precise phase offset, two-tone sweep, fast frequency switching, internal modulation, and pulse signals for bench or systems use.

Complete Two-Phase Modulation

The HP 3326A can provide two signals whose phase is adjustable and calibrated anywhere in its 13 MHz frequency range without an external phasemeter.

Self-calibration can be performed internally or externally and yields accuracy of ¡À 0.2 degrees below 100 kHz.  Phase can be set with 0.01 degree resolution at all frequencies.  Using its unique phase-calibration circuitry, calibrated multi-phase signals are easily achieved with two or more HP 3226As.

Powerful Two-Tone Capability

The HP 3326A is the single-source answer for producing a wide variety of broadband two-tone signals.  Its two channels can be offset up to ¡À 100 kHz, either in the CW mode or while sweeping.

Channel amplitudes and functions (sine or square) can be selected independently and provided from separate outputs or through the built-in signal combiner.  Low sinewave distortion (harmonics are at least -70 dBc below 100 kHz) makes low-distortion intermodulation measurements a simple task.

Versatile ATE Source

With two complete synthesizers in a single instrument, rack space and power are conserved.  Features like internal amplitude and phase modulation, two-tone, and pulse modes allow this one instrument to do the job of several sources.

All functions, modes, and parameters of the HP 3326A are completely programmable over the HP-IB.  Maximum accuracy is ensured with amplitude/phase calibrations that can be enabled, disabled and initiated under remote control.

High Performance Modulation and Pulses

Precise amplitude and phase modulation is easy with both channels of the HP 3326A.  Each channel can be used with simultaneous AM and PM, or one channel can modulate the other.  Amplitude modulation frequency is dc to 100 kHz and envelope distortion is better than -46 dB.

In the pulse mode both pulse and pulse-complement outputs are provided.  Symmetry range is 1% to 99% and is settable in 0.1% increments.  In addition, both pulse amplitudes and their offsets are independently controllable.

Other Features

The HP 3326A has a host of convenience features to speed and simplify signal generation.  Nine complete setup states can be stored in nonvolatile memory, along with automatic storage of the power-off state.  A discrete sweep mode is available to generate from 2 to 63 frequency pairs with dwell times individually selectable for each frequency and each channel.  Several flexible triggering modes allow hardware or software triggers to initiate frequency, amplitude, or phase changes, and sweeps.

DC offset is available in all modes, and all outputs are floating.  Frequency resolution is 11 digits, and all sweeps and frequency changes are phase-continuous.

Two Channel Synthesizer, DC to 13 MHz

• Combines two independent synthesizers, flexible modulation and control circuitry into a single, powerful package
• Provides precise phase offset, two-tone sweep, fast frequency switching, internal modulation, and pulse signals
• Internal switch selected signal combiner sums both source outputs into a single ultra-low IMD signal source
• Phase continuous sweeps are available in linear and multielement discrete modes
• DC offset is available in all modes, and all outputs are floating

Specification Summary

• Frequency (waveforms are sine, square, pulse, and dc)
  * Range: 0 Hz to 13 MHz
  * Resolution: 1 µHz below 100 kHz, 1 mHz at and above 100 kHz
  * Output Amplitude (sine mode) - Range: 1 mVpp to 10 Vpp in 8 ranges without DC offset
• Phase Offset (channel A vs B in two-phase mode)
  * Range/Resolution: = 720 degrees range, 0.01 degree resolution
• Frequency Sweep
  * Sweep Types: linear, discrete (2-63 discrete elements)
  * Sweep Time: 5 ms to 1000 s, Linear or per element

Modes

• Two-Channel: Channels A and B are independent
• Two-Phase: Channels A and B are the same frequency, with a calibrated phase difference between them
• Two-Tone: Channel B frequency must be within 100 kHz of the Channel A frequency
• Pulse: Channel B is the complement of the Channel A output

Amplitude Modulation
Channel A and Channel B outputs with external modulation or to the Channel A output with internal modulation (Channel B is the modulation source).

• Waveforms: Sine, square, or pulse (pulse allowed in external only)
• Carrier Frequency Range: DC to 13 MHz
• Modulation Frequency Range: DC to 100 kHz
• Modulation Depth: 0 to 100%

Phase Modulation
Channel A and Channel B outputs with external and synchronous phase modulation, and to the Channel A output with internal phase modulation (Channel B is the modulation source).

• Waveforms: Sine, square or pulse (pulse allowed in external only)
• Carrier Frequency Range: DC to 13 MHz
• Phase Deviation: ¡À360¡ã

Auxiliary Outputs

• Sync A
• X-axis Drive
• Z-axis Blank
• Sweep Marker
• 10 MHz Reference

Auxiliary Inputs

• External Reference Input
• External Trigger
• Channel A External Phase Calibration
• Channel B External Phase Calibration
• Channel A External Amplitude Modulation
• Channel B External Amplitude Modulation
• Channel A External Phase Modulation/Synchronous Phase Modulation
• Channel B External Phase Modulation

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