Product Introduction:
Stanford Digital Delay Generator DG535

SRS/DG535 4-Channel Digital Delay/Pulse Generator from the USA
Detailed Description

Specifications
Time Delay

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: 25ppm crystal oscillator
Optional: 1ppm TCXO (Option 03)
External: 10.0 MHz reference input
RMS Jitter: <100 PS + (10?? × delay)
Trigger Delay (Typical): 85 nanoseconds (external trigger to T0 output)

External Trigger

Rate: DC to 1/(1 + μs long delay)
Threshold: ±2.56 VDC
Resolution: 10 millivolts
Trigger Slope: Rising or falling edge
Impedance: 1MΩ + 40 pF or 50Ω

Internal Rate Generator

Rate: Single shot, 0.001 Hz to 1.000 MHz, or line
Resolution: Four digits, 0.001 Hz below 10Hz
Accuracy: Same as timebase
Jitter: 1:10,000
Settling: <2 seconds for any rate change
Burst Mode: 2 to 32766 pulses per burst at integer multiples of the trigger period (4 to 32767)

Outputs

Load: 50Ω or high impedance
Rise Time: 2 to 3 nanoseconds (typical)
Slew Rate: 1V/ns
Overshoot: <100 mV + 10% of pulse amplitude
Levels: TTL: 0 to 4 VDC (normal or inverted)
ECL: -1.8 to -0.8 VDC (normal or inverted)
NIM: -0.8 to 0.0 VDC (normal or inverted)
VAR: Adjustable offset and amplitude between -3 and +4 VDC with 10 mV resolution. 4V maximum swing.
Accuracy: ±(50 mV + 3% of pulse amplitude)
Option 02: Rear panel outputs correspond to T0, A, B, C, D outputs with 8 nominal amplitude × 1kHz repetition rate front panel outputs 1 microsecond pulse. Output level reduced by 2 V per additional average output current in milliamps.

Fast Rise Time (Option O4A)

Output Amplitude: 0.5 to 2.0 VDC
Output Offset: -0.8 volts (typical)
Transition Time
Rise (20/80%): 100ps (max)
Fall (20/80%): 2000 ps (max)
Pulse Aberration
Foot: 4% (typical)
Ring: ±5% (typical)

Fast Fall Time (Option O4B)

Output Amplitude: -0.5 to -2.0 VDC
Output Offset: 0.8 volts (typical)
Transition Time
Rise (20/80%): 2500 ps (max)
Fall (20/80%): 100ps (max)
Pulse Aberration
Foot: 4% (typical)
Ring: ±5% (typical)

General

Display: Backlit 20-character LCD
Computer Interface: GPIB (IEEE-488). All instrument functions and settings can be controlled via the interface bus. Interface queue can be viewed from the front panel.
Dimensions: 8.5" × 4.75" × 14" (W×H×L)
Weight: 10 lbs.
Power Supply: 70 W, 100/120/220/240 VAC, 50/60 Hz