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Run Modes
Continuous
Triggered
connector on the slave unit.
COUPLE IN
This SMB connector accepts coupling signals from the master unit.
Input level is LVPECL, terminated into 50 to 1.3V. For multi-
instrument synchronization, connect this input to the COUPLE OUT
connector on the master unit.
The 2074 can be programmed to operate in one of four run modes:
Continuous, Triggered, Gated and counted Burst. There are two
other modes that can operate in conjunction with the basic four run
modes, these are: Delayed Trigger and Re-Trigger. The run modes
are common to all of the 2074 waveform output
Summary of run modes and optional trigger sources are listed in
Table 1-1. Information in this table also identifies legal run modes
and lists possible setting conflicts.
In normal continuous mode, the selected waveform is generated
continuously at the selected frequency, amplitude and offset. Only
when operated from a remote interface, the output can be toggled
on and off using a trigger command.
In triggered mode, the Model 2074 circuits are armed to generate
one output waveform. The trigger circuit is sensitive to transitions at
the trigger input. Select between positive or negative transitions to
trigger the instrument. You may also program the trigger level to the
desired threshold level. When triggered, the generator outputs one
waveform cycle and remains idle at the last point of the waveform.
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.
The trigger signal, whether it comes from an external source or from
an interface command, is routed through some electrical circuits.
These circuits cause some small delay known as system delay.
System delay cannot be eliminated completely. The system delay is
a factor that must be considered when applying a trigger signal. It
defines the time that will lapse from a valid trigger edge or software
command to the instant that the output reacts.
1-15
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