Agilent Technologies E1445A Manual de usuario descargar pdf (Pagina 166)

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101

The ARM-TRIG Configuration

Each standard and arbitrary waveform is a series of discrete amplitude

points (digital-to-analog (DAC) codes). The Agilent E1445A AFG uses an

ARM-TRIG triggering configuration to output these points. When initiated,

an arm signal enables the AFG to output one amplitude point each time a

trigger signal is received. The “arm-trigger” model is shown in Figure 5-1.

The ARM-TRIG

States

The AFG operates within four states: Idle, Wait-for-Arm, Wait-for-Trigger,

and Instrument Action (see Figure 5-1).

When power is applied or following a reset or an abort, the AFG is in the

Idle state. The AFG is set to the Wait-for-Arm state with the

INITiate[:IMMediate] command.

The AFG moves to the Wait-for-Trigger state when an arm from the

specified arm source is received. The AFG moves to the Instrument Action

state when a trigger is received.

After the Instrument Action (amplitude point is output) occurs, the AFG

returns to the Wait-for-Trigger state until the next trigger occurs. When

enough triggers have occurred such that the specified waveform cycle

(repetition) count has been reached, the AFG returns to the Wait-for-Arm

state until the next arm occurs. When the specified arm count has been

reached, the AFG returns to the Idle state.

Figure 5-1. The ARM-TRIG Triggering Model

164 Arming and Triggering Chapter 5

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