# HP 3325B Synthesizer/Function Generator, 1 µHz to 21 MHz (Pre-Owned) # HP 3325B Synthesizer/Function Generator, 1 µHz to 21 MHz (Pre-Owned) ## Key Features At A Glance - Synthesized output from 1 µHz to 21 MHz with 1 µHz resolution for precision frequency setting - Sine, square, triangle, positive and negative ramps, plus arbitrary waveforms via HP-IB - Frequency accuracy of ±5 × 10⁻⁶ at time of calibration (20°C to 30°C) - Sine wave amplitude range of 1 mV to 10 Vpp into 50 Ω in 8 amplitude ranges - Phase noise of −60 dB in a 30 kHz band centered on a 20 MHz carrier with Option 001 - 100-segment discrete sweep capability for arbitrary multi-segment linear, log, and stepped frequency sequences - Internal modulation source for AM, phase modulation, and use as a second arbitrary source - HP-IB and RS-232 programmable for ATE integration; fully program-compatible with the HP 3325A The HP 3325B is a 1 µHz to 21 MHz synthesizer/function generator designed for high-performance signal generation on the bench and in automated test systems. It combines synthesizer-grade frequency precision with the waveform versatility of a function generator, producing sine, square, triangle, positive and negative ramps, and user-defined arbitrary waveforms. The instrument provides 1 µHz frequency resolution below 100 kHz and 1 mHz resolution at and above 100 kHz, with frequency accuracy of ±5 × 10⁻⁶ at 20°C to 30°C at the time of calibration. The 3325B is used in general-purpose bench applications and in HP-IB-controlled ATE systems where its synthesized accuracy and waveform flexibility serve as a single source for stimulus testing. Precision squarewaves up to 10.999,999 MHz have 20 ns rise times with synthesizer accuracy and precision, and triangle and ramp waveshapes are available with 0.05 percent linearity up to 10.999,999 kHz. DC offset can be added to the standard waveforms, and the internal modulation source can be used to deliver user-defined waveshapes, allowing the 3325B to act as an arbitrary function generator via HP-IB. ValueTronics International has supplied new and used test and measurement equipment from our facility in Elgin, Illinois since 1992. The HP 3325B units we offer are stored and tested at our 20,000 square foot secure warehouse at 1675 Cambridge Drive, where our technicians inspect each instrument before it ships. Working with ValueTronics rather than an unverified marketplace source means the synthesizer arrives with documented condition, the accessories you expect, and a direct line to the person who handled your order if anything needs follow-up. ## Brand Heritage Hewlett-Packard's test and measurement business was spun out as Agilent Technologies in 1999, and the electronic measurement portion of Agilent became Keysight Technologies in 2014. The HP 3325B is a product of the original Hewlett-Packard era; calibration support and documentation for instruments of this lineage routes through Keysight today. ## Product Core & Specifications Specification Value Waveforms Functions Sine, square, triangle, negative and positive ramps Frequency Sine Range 1 µHz to 20.999 999 999 MHz Square Range 1 µHz to 10.999 999 999 MHz Triangle/Ramps Range 1 µHz to 10.999 999 999 kHz Resolution 1 µHz, < 100 kHz; 1 mHz, ≥ 100 kHz Accuracy ±5 × 10⁻⁶, 20° to 30° C at time of calibration Warm-up time 20 minutes to within specified accuracy Main Signal Output (all waveforms) Impedance 50 Ω Connector BNC; switchable to front or rear panel, nonswitchable with Option 002, except by internal cable change. Amplitude Range 1 mV to 10 Vp-p in 8 amplitude ranges, 1-3-10 sequence (10 dB steps), into 50 Ω load Sine peak-peak (min/max) 1.000 mV / 10.00 V Sine rms (min/max) 0.354 mV / 3.536 V Sine dBm 50 Ω (min/max) \-56.02 / +23.98 Square peak-peak (min/max) 1.000 mV / 10.00 V Square rms (min/max) 0.500 mV / 5.000 V Square dBm 50 Ω (min/max) \-53.01 / +26.99 Triangle/Ramps peak-peak (min/max) 1.000 mV / 10.00 V Triangle/Ramps rms (min/max) 0.289 mV / 2.887 V Triangle/Ramps dBm 50 Ω (min/max) \-57.78 / +22.22 Resolution 0.03% of full range or 0.01 dB (4 digits) Sine Wave Amplitude Accuracy 1 mHz to 100 kHz ±0.1 dB, ≥ 3 Vpp; ±0.2 dB, < 3 Vpp 100 kHz to 20 MHz ±0.4 dB, ≥ 3 Vpp; ±0.6 dB, 0.1 to 3 Vpp Sine Wave Spectral Purity Phase noise \-60 dB for a 30 kHz band centered on a 20 MHz carrier (excluding ±1 Hz about the carrier) with high-stability Option 001 installed. Spurious All non-harmonically related output signals will be more than 70 dB below the carrier (60 dB with dc offset) or less than -90 dBm, whichever is greater. Sine Wave Harmonic Distortion (relative to fundamental at full output) 0.1 Hz \-65 dB 50 kHz \-60 dB 200 kHz \-40 dB 2 MHz \-30 dB 15 MHz \-25 dB 20 MHz \-25 dB Square Wave Characteristics Rise/fall time ≤ 20 ns, 10% to 90% at full output Overshoot ≤ 5% of peak-to-peak amplitude, at full output Settling time < 1 µs to settle to within .05% of final value DC Offset Range dc only (no ac signal): 0 to ±5.0 V/50 Ω dc + ac Maximum dc offset ±4.5 V on highest range, decreasing to ±4.5 mV on lowest range. Resolution 4 digits Sine Wave Amplitude Modulation Modulation depth at full output for each range 0 to 100% Modulation frequency range dc to 400 kHz (0 to 21 MHz carrier frequency) Sensitivity ±5 V peak for 100% modulation Sine Wave Phase Modulation Range ±850°, ±5 V input Modulation frequency range dc - 5 kHz Frequency Sweep Sweep time - Linear 0.01 s to 1000 s Sweep time - Logarithmic 1 s to 1000 s single, 0.1 s to 1000 s continuous Discrete sweep - Number of segments 100 maximum Discrete sweep - Time/Segment 0.01 s to 1000 s, 0.01 s resolution Maximum sweep width Full frequency range of the main signal output for the waveform in use, except minimum log start frequency is 1 Hz. Phase continuity Sweep is phase continuous over the full frequency range of the main output. Modulation Source Frequency range Sine 0.1 Hz to 10 kHz, square 0.1 Hz to 2 kHz Frequency accuracy 0.1%, typical Impedance Drives 10 kΩ or greater load Sinewave purity \-34 dBc or better, typical Waveforms Sine, square, arbitrary Auxiliary Inputs and Outputs Auxiliary frequency output 21 MHz to 60.999 999 999 MHz, under range coverage to 19.000 000 001 MHz, frequency selection from front panel; 0 dBm; output impedance 50 Ω. Sync output Square wave with V (high) ≥ 1.2 V, V (low) ≥ 0.2 V into 50 Ω. Frequency range is the same as main signal for front panel sync and dc to 60 MHz for rear panel sync. X-Axis drive 0 to > +10 V dc linear ramp proportional to sweep frequency, linearity, 10-90%, ±0.1% of final value MATE/CIIL Compatibility MATE system applications Option H05 provides internal CIIL compatibility. Option 001 High Stability Frequency Reference Aging rate ±5 × 10⁻⁸/week (72 hr warm up); ±1 × 10⁻⁷/month (after 15 days continuous operation). Ambient stability ±5 × 10⁻⁸ (0° C to +55° C) Warm-up time Reference will be within ±1 × 10⁻⁷ of final value 15 minutes after turn-on for an off time of less than 24 hours. Option 002 High Voltage Output Frequency range 1 µHz to 1 MHz Amplitude Range 4.00 mVpp to 40.00 Vpp (≥ 500 Ω, ≤ 500 pF load) Accuracy ±2% of full output for each range at 2 kHz Output impedance < 2 Ω at dc, < 10 Ω at 1 MHz dc offset range 4 times the specified range of the standard instrument. General Operating Temperature 0° C to 55° C Relative humidity 95%, 0° C to 40° C Altitude ≤ 15,000 ft Power 100, 120, 220, 240 V, +5%, -10%, 48 to 66 Hz; 90 VA, 120 VA with all options; 10 VA standby Weight 9 kg (20 lb) net; 14.5 kg (32 lb) shipping Size 132.6 mm H × 425.5 mm W × 497.8 mm D (5.25 in × 16.75 in × 19.63 in) **Important:** Sine wave harmonic distortion varies across the frequency range: −65 dBc at 0.1 Hz, −60 dBc at 50 kHz, −40 dBc at 200 kHz, −30 dBc at 2 MHz, −25 dBc at 15 MHz and 20 MHz. Review distortion at the operating frequency against application requirements.**Important:** HP-IB and RS-232 interfaces: All functions, including frequency, amplitude, phase, modulation, sweep, and waveshapes, are programmable via HP-IB or RS-232 interface. The HP 3325B is fully compatible in form, fit, and function with the HP 3325A. All HP-IB programs written for the HP 3325A are fully compatible with the HP 3325B.**Important:** With Option 002 installed, the front/rear panel output BNC is nonswitchable except by internal cable change. ## About this used unit - Warranty included - Functional verification included - Standard Calibration Upgrade Options: No Calibration Required, NIST Traceable, Z540.1 or ISO 17025 with Data, Z540.3 Guardbanding with Data. - Note that unnecessary accessories may not be included (contact Test Architect to confirm). **Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.** ## Details - **Price:** 0.0 USD - **Vendor:** HP - **Type:** Func Gen - **Tags:** Agilent, Agilent Keysight, Function, Manufacturers, product_manual_group_1, Product_used, Signal Generators, Updated Item Review ## Variants | Variant | Price | Available | |---------|-------|-----------| | No Option / None | 0.00 USD | In stock | | No Option / NIST Traceable | 0.00 USD | In stock | | No Option / NIST Traceable with Full Data | 0.00 USD | In stock | | No Option / ISO IEC 17025 Accredited | 0.00 USD | In stock | | 001/002 / None | 0.00 USD | In stock | | 001/002 / NIST Traceable | 0.00 USD | In stock | | 001/002 / NIST Traceable with Full Data | 0.00 USD | In stock | | 001/002 / ISO IEC 17025 Accredited | 0.00 USD | In stock | ## Images - 3325B HP Function Generator --- > Source: [ValueTronics](https://valuetronics.com/products/3325b-agilent-function-generator-used) > Updated: 2026-06-04