Atec Stanford-DG535 - Manual (Page 3)

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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 crystal oscillator (TCXO).
The internal timebase is available as a 1 Vpp square wave on a
rear-panel BNC. This output is capable of driving a 50 Ω load
and can be used to provide a master timebase to other delay
generators. Any external 10.0 MHz reference signal with a
1 Vpp amplitude can also be used as an external timebase.
Fast Rise and Fall Time Modules
External in-line modules are available to reduce the rise or fall
time of the DG535 outputs to 100 ps. These modules use step
recovery diodes to speed up the rise time (option SRD1) or the
fall time (option O4B). A bias tee (option O4C) allows these
modules to be used with the optional rear-panel outputs to
produce steps up to 15 V. For step amplitudes of less than
2.0 V, the fast transition time units should be attached directly
to the front panel of the DG535.
Easy to Use, Easy to Program
All instrument functions can be accessed through a simple,
intuitive, menu-based interface. Delays can be entered with
the numeric keypad in either fixed-point or exponential
notation, or by using the cursor keys to select and change
individual digits. The backlit 20-character LCD display makes
it easy to view delay settings in all lighting conditions.
The DG535 comes standard with a GPIB (IEEE-488)
interface. All instrument functions can be queried and set
via the interface. You can even display the characters the
DG535 has received over the interface on the front-panel
LCD display. This can be valuable when debugging programs
which send commands to the instrument.
DG535 Digital Delay/Pulse Generator
Ordering Information
DG535 Delay/pulse generator w/ GPIB $4195
Option 02 ±32 V rear panel outputs $650
Option 03 1 ppm TCXO timebase $350
Option 06 Trigger inhibit input $250
SRD1 100 ps rise time module $250
O4B 100 ps fall time module $250
O4C Bias Tee (for 02 & SRD1 or O4B) $100
O5 Dual rack mount tray $150
DG535 rear panel (with Opt. 02)