VTI Instruments EX1401, Руководство пользователя

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EX1401 Instrument Drivers 91
Arming from LAN Events by Other Instruments
The user, or another LXI device, can send LAN events to arm the EX1401 using the Digitizer driver.
Alternatively, a LAN event can be sent to the EX1401 using the Platform driver.
T
RIGGERING
When the measurement is armed and when there are enough digitized samples already collected in
the FIFO for pre-trigger delay, the measurement becomes ready to receive a trigger event.
Self-triggering
When the Immediate trigger source is enabled, the EX1401 triggers automatically and acquires data
records as soon as it is ready to receive a new trigger event.
Triggering by User’s Command
The EX1401 triggers by the SendSoftwareTrigger method when a software trigger source is enabled.
Triggering at a Certain Time Interval
The EX1401 can be triggered at a specific time interval using the ALARM0-1 trigger sources. In
addition to enabling the alarm as a trigger source, it must be configured and enabled using the
Alarm
interface.
Triggering by Analog Signal
The EX1401 is triggered when an analog signal at an input channel crosses the trigger threshold
level. In order to trigger from the analog signal, the channel must be enabled as a trigger.
Trigger Level
Trigger at Rising Edge
Trigger at Falling Edge
Hysteresis
F
IGURE
5-11: T
RIGGERING BY
A
NALOG
S
IGNAL
Triggering by External Pulse
The EX1401 can receive a trigger from the back panel trigger SMB connector by enabling the EXT
trigger source.
Triggering from DIO Lines
The EX1401 can receive a trigger event from the digital I/O port by enabling the DIO trigger
sources.
Triggering from LAN Events by Other Instruments
The user, or other LXI device, can send a LAN event to trigger the EX1401 using the Digitizer
driver. Alternatively, a LAN event can be sent to the EX1401 using the Platform driver.