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Chapter 4 Features and Functions
Scanning
4
The Scan Process
The figure below illustrates how a scan works.
The scan operation consists of two layers: arm layer and trigger layer.
The instrument is considered to be in the idle state whenever it is not
operating within either of these layers. When a scan is initiated, the
instrument is taken out of the idle state and proceeds into the arm layer.
When an arm source is detected, the instrument leaves the arm layer
and proceeds to the trigger layer. In the trigger layer, for each detected
trigger source, it advances one step in the scan list. After advancing
through all the channels/bits in the scan list, and reaching the arm
count, the scan is terminated and the instrument returns to the idle
state.
Idle
Trigger Event
Detection
Arm Event
Detection
Another
Scan?
Another
Channel?
yes
no
no
yes
Scan Channel
Output Trigger*
Idle
Trigger Layer
Arm Layer
Controlled by
Arm Source
* Note: The trigger out pulse will occur at the specified trig-out line
only if you have configured to enable the slot to output.
Controlled by
Arm Count
Controlled by
Trigger Source
Controlled by
Scan List
Initialize
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