2
PULSE OUTPUTS
There are four, pulse output BNC's: AB, -AB,
CD and -CD. The AB output provides a pulse
for the interval between the time set for channel
A and channel B. The CD output provides a
pulse for the interval between the time set for
channel C and channel D. These outputs allow
the DG535 to generate two precisely timed
complementary pulses.
OPTION 06 - TRIGGER INHIBIT INPUT
If the DG535 was ordered with the option 06,
there will be a BNC connector located directly
under the power button on the front panel to
which the trigger inhibit input is applied. This
input is active low and is used to disable the
trigger mode. A TTL low inhibits triggers while
a TTL high permits triggers. If there is no input
signal, the input floats high and all triggers are
enabled.
REAR PANEL FUNCTIONS
POWER ENTRY MODULE
The power entry module is used to fuse the line,
select the line voltage, and block high frequency
noise from entering or exiting the instrument.
Refer to the section at the front of this manual
for instructions on selecting the correct line voltage
and fuse.
IEEE-488 STD PORT
The 24 pin IEEE-488 rear panel connector allows a
computer to control the DG535. The command
syntax for the GPIB transactions is detailed in the
programming section of this manual. The address of
the instrument on the GPIB is set from the front
panel by the GPIB menu.
10.000 MHz REFERENCE
Internal or external references may be used as the
timebase for the digital delays. If the internal
timebase is to be used, the rear panel switch should
be in the INT position. In this position, the 10.000
MHz internal timebase will be appear as a 1V p-p
square wave at the rear panel BNC. This output is
capable of driving a 50
Ω
load, and may be used to
provide the same timebase to several DG535's.
An external reference may be applied to the DG535
by placing the switch in the EXT position. A 10.0
MHz, ±1%, reference with a 1 Vp-p amplitude must
be applied to the rear panel BNC which now serves
as a reference input. If the external reference has
insufficient amplitude, or is more than a few percent
off the nominal 10.0 MHz, then the message "Ext
Clk Error" will appear on the LCD until the problem
