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Getting Started 1-5
Trigger Input
The Trigger Input accepts signals that stimulate the Model 3152 to
output waveforms. The trigger input is inactive when the instrument
is in continuous operating mode. When placed in trigger, gated or
burst mode, the trigger input is made active and waits for the right
condition to trigger the instrument. In trigger and burst modes, the
trigger input is edge sensitive, i.e., it senses transitions from high
to low or from low to high to trigger the Model 3152. The direction
of the transition is programmable.
In PLL mode, the trigger input is
used as phase reference input.
In gated mode, the trigger input is level sensitive, i.e., the Model
3152 is gated when the level is high and idle when the level is low.
Level sensitivity may be programmed for the trigger input.
Operating Modes
There are a number of operating modes that the Model 3152 can be
programmed to operate in: continuous mode, triggered mode, gated
mode and burst mode. These operating modes are described
below.
Continuous Mode
In continuous mode, the selected waveform is output continuously
at the selected frequency, amplitude and offset.
Triggered Mode
In triggered mode, the Model 3152 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 on the external signal
.
When triggered,
the synthesizer outputs the waveform and remains idle at the last
point of the waveform. The Model 3152 can be armed to receive a
trigger signal from the front panel BNC connector, a VXIbus
backplane TTLTRG<n> or from an internal, programmable trigger
generator.
The trigger signal, whether it comes from the front panel or from
the VXIbus, has to pass through circuitry. These circuits cause a
small delay known as system delay. System delay cannot be
eliminated completely. It is, however, minimized in the Model
3152 to approximately 200ns maximum. System delay is a factor
that must be considered when applying a trigger signal. It defines
how long it will take from a valid trigger edge to the moment that
the output reacts.
While system delay cannot be controlled, the Model 3152 offers a
controllable trigger delay parameter. When utilized, delay from a
trigger signal to output waveform may be programmed from 0
clocks to one million clocks. This delay is additional to the
system delay.
Burst Mode
The burst mode is an extension of the triggered mode where the
Model 3152 can be armed to output a counted number of
waveforms following a triggered signal. Like trigger mode, burst
can be triggered from a front panel BNC connector, a VXIbus
backplane TTLTRG<n> or from an internal, programmable trigger
generator.
Содержание 3152
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