The Stanford Research Systems DG645 is a versatile digital delay/pulse generator that provides precisely defined pulses at repetition rates up to 10 MHz. The ultra-low jitter delay generator offers several improvements over older designs — lower jitter, higher accuracy, faster trigger rates, and more outputs. The DG645 also has Ethernet, GPIB and RS-232 interfaces for computer or network control of the instrument.

• 4 pulse, 8 delay outputs (opt.)
• Trigger rates to 10MHz
• Precision rate generator
• Fast transition times
• Ovenized crystal or Rb timebase (opt.)
• Ethernet, GPIB and RS-232 interfaces
• Specifications
• Delay Generator Timing

• Four independent delay channels
• Two fully-defined pulse channels
• 5 ps delay resolution
• 50 ps rms jitter
• Adjustable amplitude and offset
• Delays up to 1000 seconds
• Standard GPIB interface
• Optional ±32 V output

• Switch controlled time delays
• 0 to 63.5 ns delay range
• 0.5 ns resolution
• Low reflections and feed-through

SRD1 is an accessory, which reduces the rise time of a front-panel output to less than 100 ps.