Table of Contents
Advertisement
Delayed Trigger
Re-Trigger
Trigger Source
External
Bus
The delayed trigger function is exactly the same as the trigger mode
except a programmable delay inhibits signal output for a pre-
determined period after a valid trigger. The delay time defines the
time that will lapse from a valid trigger (hardware or software) to
output. The delay is programmable in steps of 20 ns from 200 ns to
20 s. The trigger delay can be applied to all run modes: continuous,
trigger and burst.
The Re-trigger run mode requires only one trigger command to start
a sequence of triggered or counted burst of signals. The re-trigger
delay defines the time that will lapse from the end of a signal to the
start of the next signal. Re-trigger delay is programmable in steps of
20 ns from 200 ns to 20 seconds.
The Model 2074 can be triggered from a number of sources:
1) Rear panel connector, designated as TRIG IN;
2) Front panel button marked as MAN TRIG (second function to
the Enter button); and
3) Bus commands that are applied to the instrument from any
interface, LAN, USB or GPIB.
Description of the various trigger source options is given in the
following paragraphs. Summary of trigger options and optional
trigger sources are listed in Table 1-2, identifying legal operating
modes and listing possible setting conflicts.
When selecting the External trigger source, the rear panel TRIG IN
connector becomes active and every legal signal that is applied to
this input is causing the 2074 to trigger. Alternately, if an external
signal is not available, the front panel MAN TRIG button may also
be used to trigger the instrument. When EXT is selected, triggers
commands from a remote interface are ignored. EXT is the default
trigger source.
When selecting the Bus as a trigger source, the rear panel TRIG IN
connector and the front panel MAN TRIG button are disabled and
only trigger commands from a remote interface are accepted by the
instrument. Make sure that the appropriate trigger source is
selected if you mix remote and local operation.
1-17
Advertisement
Table of Contents
