# Stanford Research Systems DS335 3 MHz Function Generator (Pre-Owned) # Stanford Research Systems DS335 3 MHz Function Generator (Pre-Owned) ## Key Features At A Glance - 1 µHz to 3.1 MHz frequency range with 1 µHz resolution - DDS-based sine, square, ramp, triangle, and Gaussian white-noise outputs - 10 Vpp into 50 Ω, or 20 Vpp into a high-impedance load - Phase-continuous linear and logarithmic frequency sweeps - Internal and external FSK modulation (up to 50 kHz internal rate) - Optional GPIB and RS-232 interfaces for full remote and ATE control - Standard ±5 ppm timebase; optional 2 ppm TCXO - Stores up to nine instrument setups in non-volatile memory The Stanford Research Systems DS335 is a 3 MHz synthesized function generator built on a Direct Digital Synthesis (DDS) architecture. It is described as a simple, low-cost instrument that brings features not normally found in function generators in its price range, delivering the low phase noise inherent to DDS along with wide-band amplifiers that maintain good pulse response and low distortion. A function generator produces known, controllable test signals used to stimulate a device under test so that its response can be measured. The DS335 is designed for general benchtop or ATE applications, where a stable, computer-controllable source of sine, square, ramp, triangle, and noise waveforms is needed for design, debug, and automated test work. ValueTronics stocks and holds its own inventory in a 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. Every used unit we sell is inspected and functionally verified in-house before it ships, while new units ship factory-sealed exactly as received from the manufacturer. Holding our own stock lets us match the right instrument and condition to each customer's application directly. ## Product Core & Specifications Specification Value Frequency Range (Max. Freq. / Resolution) Sine 3.1 MHz (1 µHz resolution) Square 3.1 MHz (1 µHz resolution) Ramp 10 kHz (1 µHz resolution) Triangle 10 kHz (1 µHz resolution) Noise 3.5 MHz (Gaussian weighting) Output Source impedance 50 Ω Grounding Output may float up to ±40 V (AC + DC) Amplitude Range 50 mVpp to 10 Vpp (50 Ω), 100 mVpp to 20 Vpp (Hi-Z) Resolution 3 digits (DC offset = 0V) Offset ±5 VDC (50 Ω), ±10 VDC (Hi-Z) Offset resolution 3 digits Accuracy 0.1 dB (sine output) Sine Wave Spurious response < -65 dBc to 1 MHz; < -55 dBc to 3.1 MHz Harmonic distortion DC to 100 kHz: < -60 dBc; 100 kHz to 1 MHz: < -50 dBc; 1 MHz to 3 MHz: < -40 dBc Phase noise < -60 dBc (30 kHz band centered on carrier) Square Wave Rise/fall time 15 ns ± 5 ns (10 % to 90 %) Asymmetry <3 ns + 1 % of period Overshoot <5 % (full-scale output) Ramps and Triangles Rise/fall time 100 ns Linearity ±0.1 % of full scale Settling time 200 ns (0.5 % of final value) FSK Modulation Modes Internal, External Max rate 50 kHz, internal External FSK TTL input, 1 MHz (max.) Sweeps Type Linear and logarithmic (phase continuous) Span Linear (full frequency range), log (6 decades) Sweep rate 0.01 Hz to 1 kHz Timebase Accuracy Standard ±5 ppm (20 °C to 30 °C) Optional TCXO, 2 ppm stability, 2 ppm aging (20 °C to 50 °C) General Interfaces Optional RS-232 and GPIB. All instrument functions are controllable over the interfaces. Non-volatile memory Up to nine sets of instrument settings may be stored and recalled. Dimensions 8.5" × 3.5" × 13" (WHD) Weight 8 lbs. Power 22 W, 100/120/220/240 VAC, 50/60 Hz Warranty One year parts and labor on defects in materials and workmanship > **Important:** Output may float up to ±40 V (AC + DC). ## About this Pre-Owned unit This pre-owned unit is inspected and functionally verified in-house before it ships and is backed by our pre-owned warranty. To confirm its exact condition, firmware revision, installed options, or included accessories for your application before ordering, contact our Test Architects. - 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). ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application. **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:** 245.0 USD - 582.5 USD - **Vendor:** Stanford Research Systems - **Type:** Func Gen - **Tags:** Function, Manufacturers, product_manual_group_1, Product_used, Signal Generators, Stanford Research, Updated Item Review ## Variants | Variant | Price | Available | |---------|-------|-----------| | None | 245.00 USD | In stock | | NIST Traceable | 470.00 USD | In stock | | NIST Traceable with Full Data | 545.00 USD | In stock | | ISO IEC 17025 Accredited | 582.50 USD | In stock | ## Images - DS335 Stanford Research Function Generator --- > Source: [ValueTronics](https://valuetronics.com/products/ds335-stanford-research-function-generator-used) > Updated: 2026-06-27