Digital Delay/Pulse Generator DG535 — Digital delay and pulse generator (4-channel) DG535 Digital Delay/Pulse Generator · Four independent delay channels · Two fully-defined pulse channels · 5 ps delay resolution · <100 ps rms jitter · Adjustable amplitude and offset · Delays up to 1000 seconds · 1 MHz maximum trigger rate · Standard GPIB interface · Optional ±32 V outputs Stanford Research Systems The DG535 Digital Delay/Pulse Generator provides four precisely-timed logic transitions or two independent pulse outputs. The delay resolution on all channels is 5 ps, and the channel-to-channel jitter is typically 50 ps. Front-panel BNC outputs deliver TTL, ECL, NIM or variable level (–3 to +4 V) pulses into 50 Ω or high impedance loads. The high accuracy, low jitter, and wide delay range make the DG535 ideal for laser timing systems, automated testing, and precision pulse applications. Delay Outputs There are four delay output channels: A, B, C and D. The logic transitions of these outputs can be delayed from an internal or external trigger by up to 1000 seconds in 5 ps increments. The T0 pulse, which marks the beginning of a timing cycle, is generated by the trigger signal. The insertion delay between an external trigger and the T0 pulse is about 85 ns. Delays for each channel may be “linked” to T0 or any of the other delay channels. For instance, you can specify the delays of the four channels as:

DG535 Digital Delay/Pulse Generator In this case, when the A delay is changed, the B output will move with it. This is useful, for instance, when A and B specify a pulse and you want the pulse width to remain constant as the delay of the pulse is changed. Regardless of how the delay is specified, each delay output will stay asserted until 800 ns after all delays have timed out. The delays will then become unasserted, and the unit will be ready to begin a new timing cycle. output is limited to 4 V. In addition, you can also separately select 50 Ω or high impedance termination for each output....

DG535 Digital Delay/Pulse Generator current limiting factor to consider when using them (assuming a high impedance load). In this case, the average current is: I = 2Vtf / Z, where V is the pulse step size, t is the length of the cable in time (5 ns per meter for RG-58), f is the pulse repetition rate, and Z is the cable’s characteristic impedance (50 Ω for RG-58). Internal or External Timebase Both internal and external references may be used as the timebase for the DG535. The internal timebase can be either the standard 25 ppm crystal oscillator timebase, or the optional 1 ppm temperature-compensated...

Fast Rise Time (opt. SRD1) Channels Four independent delay outputs Range 0 to 999.999,999,999,995 seconds Resolution 5 ps Accuracy 1500 ps + timebase error × delay Timebase Standard: 25 ppm crystal oscillator Optional: 1 ppm TCXO (opt. 03) External: 10.0 MHz reference input RMS jitter <100 ps + (10–8 × delay) Trigger delay (typ.) 85 ns (ext. trigger to T0 output) Output amplitude +0.5 to 2.0 VDC Output offset –0.8 VDC (typ.) Transition time Rise (20/80 %) 100 ps (max.) Fall (20/80 %) 2000 ps (max.) Pulse aberrations Foot 4 % (typ.) Ring ±5 % (typ.) External Trigger Rate DC to 1/(1 µs + longest...