Stanford Research Systems
14 models in the catalog
Manufacturer websiteThis page summarizes the Stanford Research Systems (SRS) instruments carried in this catalog and the product categories they occupy. The catalog includes pulse and delay generators, function and arbitrary waveform generators, lock‑in amplifiers, dynamic/FFT analyzers, time‑and‑frequency instruments, and a rubidium frequency standard. Representative models include DG535 (digital delay/pulse generator with 5 ps delay resolution), DS345, DS360, DS340 and DS335 (function/arbitrary generators with sine ranges from 200 kHz up to 30.2 MHz), SR830, SR850 and SR510 (lock‑ins), SR785 and SR780 (two‑channel dynamic analyzers), SR760 and SR770 (single‑channel FFT analyzers), SR620 (time/frequency counter) and FS725 (rubidium standard). Use the sections below to identify the measurements and interface options that matter for bench or automated test integration.
- Pulse/delay generator
- DG535 — 4 channels, 5 ps delay resolution, 0 to 1000 s range
- High‑frequency counter
- SR620 — 25 ps single‑shot resolution; frequency to 1.3 GHz
- Function generators
- DS345 — sine to 30.2 MHz; DS340 — sine to 15.1 MHz; DS360 — sine to 200 kHz
- Lock‑in amplifiers
- SR830/SR850 — 1 mHz to 102.4 kHz; dynamic reserve >100 dB
- Frequency standard
- FS725 — 2 × 10 MHz, 1 × 5 MHz, 1 PPS outputs; temperature stability <1 × 10^-10
Browse by category
What SRS products are in this catalog
The catalog covers several SRS product classes relevant to laboratory and test‑system use. Function and arbitrary waveform generators: DS345 (sine to 30.2 MHz), DS340 (sine to 15.1 MHz, arbitrary playback up to 40 MSamples/s), DS335 (sine to 3.1 MHz) and DS360 (ultra‑low distortion sine source to 200 kHz). Pulse and delay: DG535 provides four delay channels, multiple output logic types and a 5 ps delay resolution. Lock‑in amplifiers: SR830, SR850 and SR510 provide phase‑sensitive detection across overlapping frequency ranges. Dynamic/FFT analyzers and spectrum tools: SR785 and SR780 are two‑channel dynamic analyzers; SR760 and SR770 are single‑channel FFT/spectrum analyzers. Time and frequency: SR620 is a universal counter and time‑interval instrument; FS725 is a Rubidium frequency standard with 10 MHz, 5 MHz and 1 PPS outputs.
Key specifications to compare
When choosing an instrument, match the device specifications to the measurement task. For timing and synchronization, compare delay resolution and delay range (DG535: 5 ps resolution, 0 to 1000 s range, ~85 ns insertion delay) and counter resolution or single‑shot timing (SR620: 25 ps rms single‑shot). For signal generation, compare usable frequency ranges and distortion: DS345 provides sine output to 30.2 MHz, DS340 to 15.1 MHz, DS335 to 3.1 MHz, and DS360 targets ultra‑low distortion to 200 kHz with THD down to -110 dB (typ.) below 5 kHz. For lock‑in work check frequency range and dynamic reserve (SR830 and SR850 operate 1 mHz to 102.4 kHz with >100 dB dynamic reserve; SR510 covers 0.5 Hz to 100 kHz with dynamic reserve up to 80 dB). For spectral and vibration analysis compare real‑time bandwidth and dynamic range (SR785 and SR780: 102.4 kHz real‑time bandwidth; SR760/SR770: up to 100 kHz real‑time bandwidth and ~90 dB dynamic range).
Connectivity, footprint and lab integration
Many SRS instruments include standard remote interfaces and rack/bench form factors; check the specific model for details. GPIB and RS‑232 appear on multiple models (examples: DG535 has GPIB; SR620 has GPIB and RS‑232; SR785 and SR780 include GPIB and RS‑232 plus parallel printer ports; DS360 lists GPIB and RS‑232). Some generators list optional or modular interfaces (DS340: optional RS‑232 and GPIB; DS335: GPIB and RS‑232 with Option 01). Power requirements, dimensions and weight vary by class — the dynamic analyzers SR785 and SR780 are heavier bench units (25.4 kg), whereas many single‑box generators and counters are lighter. The FS725 provides a compact half‑rack form with standard RF outputs on BNC connectors for 10 MHz and 5 MHz.
Frequently asked questions
- Which SRS instrument is appropriate for sub‑nanosecond pulse timing?
- For precise pulse timing and programmable delays, the DG535 provides 5 ps delay resolution across four channels and delays up to 1000 s. For timing measurements and verification, the SR620 counter offers 25 ps single‑shot timing resolution and frequency measurements up to 1.3 GHz.
- Which generator should I pick for lowest distortion sine waves?
- The DS360 is specified as an ultra‑low distortion source: THD is listed as -110 dB (typ.) below 5 kHz for the stated measurement condition and -106 dB (max.). Use the DS360 where low THD in the audio to low‑RF band is required; higher frequency coverage is available on DS345 and DS340.
- What options are available for a lab reference clock?
- The FS725 Rubidium Frequency Standard supplies 10 MHz and 5 MHz sine outputs and a 1 PPS TTL output. Output levels for the 10 MHz and 5 MHz signals are specified at +7 dBm (+/-1 dB) with 50 Ω output impedance; the unit lists temperature stability <1 × 10^-10 across 0 to 50 °C.