The Stanford Research Systems DG645 is a four-channel digital delay generator delivering precise timing signals for laboratory and integrated systems requiring meticulous synchronization. With 5 ps delay resolution, sub-25 ps typical jitter, and independent control over four output channels, the DG645 addresses demanding timing applications across physics, photonics, and materials research.
Technical Specifications
Timing Performance
• Delay resolution: 5 ps
• Delay accuracy: ±500 ps ± 10 ppm of setting
• Delay range: 0 ps to 1000 s (5 ps increments)
• Pulse width resolution: 5 ps
• Pulse width accuracy: ±500 ps ± 10 ppm of setting
• Pulse width range: 50 ps to 1000 s
• Jitter (RMS): <25 ps typical
• Channel-to-channel skew: <1 ps RMS (typ.)
Output Characteristics
• Amplitude range: 0 V to 5 V into 50 Ω load
• Output offset: -2.5 V to +2.5 V
• Rise/fall time: <1 ns (20% to 80%, into 50 Ω load)
• Output impedance: 50 Ω ± 5%
• Output connectors: 4 × BNC (delay channels), 1 × BNC (trigger output)
Triggering & Control
• Internal trigger rate: 0.01 Hz to 1 MHz
• External trigger: TTL, NIM, ECL compatible
• Line sync and manual trigger supported
• Trigger jitter (input to output): <25 ps RMS for clock sources (typ.)
• Programmable trigger holdoff
• Control: GPIB (IEEE-488.2) and RS-232
– Key Features
• Four independent delay channels with <1 ps RMS inter-channel skew
• Picosecond-level timing resolution and accuracy across nanosecond to kilosecond timescales
• Multiple trigger sources—internal, external, line sync, manual—with sub-25 ps jitter
• Variable output amplitude and DC offset for integration with diverse detection systems
– Typical Applications
Pump-probe spectroscopy, ultrafast photonics, time-correlated single-photon counting, synchronized data acquisition, and multi-channel timing control in laser systems and particle detectors.
– Compatibility & Integration
Standard 19-inch rackmount chassis. GPIB and RS-232 interfaces enable remote automation. BNC connectors support TTL, NIM, and ECL logic levels. 100/120/220/240 VAC, 50/60 Hz operation.
